PIC14000T-04/SS - 7KB OTP 8-Bit MCU 20 I/O 28-SSOP | Microchip
MPN: PIC14000T-04/SS β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.72 | $3.72 |
| 10 | $3.35 | $33.50 |
| 100 | $2.98 | $298.00 |
| 500 | $2.65 | $1,325.00 |
| 1,000 | $2.32 | $2,320.00 |
PIC14000T-04/SS Overview
A PIC microcontroller is a RISC-based 8-bit microcontroller family manufactured by Microchip Technology, widely used in embedded control applications. It belongs to the broader hierarchy of microcontrollers -> microprocessors -> integrated circuits -> semiconductors. PIC MCUs are characterized by their Harvard architecture, single-cycle instruction execution (except branches), and a small instruction set (typically 35 single-word instructions for the mid-range family), making them popular for low-cost, low-power, deterministic control tasks.
Key features of the PIC14000T-04/SS include 7KB OTP program memory, 192 bytes of RAM, 20 I/O pins, an integrated Slope A/D converter (a unique analog front-end in the PIC14xxx family), a commercial operating temperature range of 0 C to +70 C, and surface-mount SSOP-28 packaging. The architecture provides 14-bit wide instructions and supports all single-cycle instructions except program branches (two cycles), giving predictable timing for real-time control loops.
The PIC14000 family is differentiated from standard mid-range PICs by its mixed-signal capabilities, including the on-chip Slope A/D converter that allows direct interfacing with resistive sensors (thermistors, RTDs, bridge sensors) without external ADC components. This makes it particularly suitable for sensor-conditioning applications where PCB real estate and BOM cost are critical.
Typical applications include industrial sensor signal conditioning, battery chargers, SMPS control loops, HVAC damper/actuator control, and consumer appliance controllers. The integrated Slope A/D simplifies analog front-end design in cost-sensitive embedded products.
When designing with this device, note that the OTP program memory is one-time programmable - firmware must be fully verified before production programming. The 28-SSOP package is hand-solderable with care but is best assembled by reflow; the commercial 0 C to +70 C temperature range limits the part to indoor and benign-environment applications.
This page synthesizes distributor pricing, 28-SSOP drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.
Drop-in alternatives for PIC14000T-04/SS β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC14000T-04/SS (same form factor and footprint) β differing in Operating Temperature, Maximum Clock Frequency, Mounting Type, Program Memory Type, RAM Size.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC14000-04/SS
β Drop-Inβ In Stock
$4.4 / Unit
View Datasheet βPIC16F876A-I/SS
β Drop-Inπ Reference alternative (not in catalog)
PIC16F873A-I/SS
β Drop-Inπ Reference alternative (not in catalog)
PIC14000T-04/SS Maximum Ratings & Electrical Characteristics
| Core Processor | PIC |
| Core Size | 8-bit |
| Program Memory Size | 7 KB (4K x 14) |
| Program Memory Type | OTP (One-Time Programmable) |
| RAM Size | 192 bytes |
| Number of I/O | 20 |
| Maximum Clock Frequency | 4 MHz |
| Instruction Cycle Time | 200 ns |
| Number of Instructions | 35 single-word |
| Data Converters | Slope A/D |
| Operating Temperature | 0 C to +70 C (Commercial) |
| Package / Case | 28-SSOP (5.30 mm width) |
| Mounting Type | Surface Mount |
| Terminal Form | Gull Wing |
| Packaging | Tape & Reel (T) |
| Temperature Grade | Commercial |
PIC14000T-04/SS Pin Configuration
| Pin 1 | RA2/AN2 β Digital I/O / analog input |
| Pin 2 | RA3/AN3 β Digital I/O / analog input |
| Pin 3 | RA4/T0CKI β Digital I/O / Timer0 clock input |
| Pin 4 | RA5/MCLR β Digital I/O / Master Clear (reset) |
| Pin 5 | VSS β Ground |
| Pin 6 | RB0/INT β Digital I/O / External interrupt |
| Pin 7 | RB1 β Digital I/O |
| Pin 8 | RB2 β Digital I/O |
| Pin 9 | RB3 β Digital I/O |
| Pin 10 | RB4 β Digital I/O (interrupt-on-change) |
| Pin 11 | RB5 β Digital I/O (interrupt-on-change) |
| Pin 12 | RB6 β Digital I/O (interrupt-on-change) |
| Pin 13 | RB7 β Digital I/O (interrupt-on-change) |
| Pin 14 | VDD β Positive supply |
| Pin 15 | OSC2/CLKOUT β Crystal output / clock out |
| Pin 16 | OSC1/CLKIN β Crystal input / external clock |
| Pin 17 | RC0 β Digital I/O / Slope A/D input |
| Pin 18 | RC1 β Digital I/O / Slope A/D input |
| Pin 19 | RC2 β Digital I/O / Slope A/D input |
| Pin 20 | RC3 β Digital I/O / Slope A/D input |
| Pin 21 | RC4 β Digital I/O / Slope A/D input |
| Pin 22 | RC5 β Digital I/O / Slope A/D input |
| Pin 23 | RC6 β Digital I/O / Slope A/D input |
| Pin 24 | RC7 β Digital I/O / Slope A/D input |
| Pin 25 | RA0/AN0 β Digital I/O / analog input |
| Pin 26 | RA1/AN1 β Digital I/O / analog input |
| Pin 27 | NC β Not connected (per datasheet) |
| Pin 28 | NC β Not connected (per datasheet) |
Typical Applications
PIC14000T-04/SS is suitable for 7 applications: Industrial Sensor Signal Conditioning, Battery Charger Control, SMPS Primary-Side Control Loops, HVAC Damper and Actuator Control, Consumer Appliance Controllers, Automotive Interior Accessories (Non-Safety), Educational and Hobbyist Development.
Industrial Sensor Signal Conditioning
The PIC14000T-04/SS is purpose-built for industrial sensor signal conditioning thanks to its integrated Slope A/D converter, which directly digitizes resistive sensors such as thermistors, RTDs, and strain gauges using only external precision resistors and an internal comparator. Unlike conventional MCUs that require an external ADC, the Slope A/D topology allows continuous-time integration of the sensor signal, providing excellent noise rejection at low frequencies. The 4 MHz core and 200 ns instruction cycle deliver enough bandwidth for first-order linearization routines and digital filtering. With 20 I/O pins and 7 KB OTP for locked firmware, the part is ideal for cost-sensitive multi-channel sensor transmitter designs in HVAC, process control, and building automation where each sensor node must remain inexpensive.
Recommended
Battery Charger Control
The PIC14000T-04/SS fits sealed lead-acid and Li-ion charger controller applications where the integrated Slope A/D can directly measure charge current (via shunt) and battery terminal voltage. The 8-bit core executes the CC/CV charge state machine at 200 ns per instruction, leaving ample MIPS margin for temperature-compensated charge profile lookup tables stored in the 7 KB OTP. Compared with discrete charger-controller ICs, the PIC14000 enables manufacturer-specific charging algorithms locked into OTP memory, preventing field tampering. With 20 available I/O, the same MCU can drive status LEDs, an I2C battery ID EEPROM, and a relay/PFET bank for charge/discharge FET control in a compact 28-SSOP footprint.
Recommended
SMPS Primary-Side Control Loops
Low-power flyback and buck SMPS designs benefit from the PIC14000T-04/SS deterministic 200 ns instruction execution for primary-side regulation feedback loops. The integrated Slope A/D accepts the auxiliary winding voltage waveform through a resistor divider, allowing direct valley-mode voltage sensing without a dedicated PSR controller IC. The 7 KB OTP holds the PID coefficients, soft-start profile, and over-current foldback curves in firmware. With 4 MHz maximum clock and single-cycle instruction execution, the MCU maintains tight duty-cycle resolution at 100 kHz switching frequency. The 28-SSOP package handles moderate dissipation under 70 C ambient typical for SMPS daughter-board mounting.
Recommended
HVAC Damper and Actuator Control
Zone damper actuators and motorized valve controllers in HVAC systems leverage the PIC14000T-04/SS for position-feedback closed-loop control using potentiometers or Hall sensors read through the integrated Slope A/D. The 8-bit core runs PID position-control loops at millisecond update rates while 20 I/O pins drive H-bridge motor drivers, end-switch sensing, and tri-color status LEDs. Commercial 0 C to +70 C temperature grade suits indoor air-handler installations. Compared with dedicated motor-controller ASICs, the PIC14000T-04/SS lets OEMs implement proprietary anti-jitter algorithms and OEM-specific calibration curves locked in 7 KB OTP for the entire production lifetime.
Recommended
Consumer Appliance Controllers
Small kitchen and personal-care appliances (rice cookers, coffee machines, hair dryers, garment steamers) commonly use the PIC14000T-04/SS as a single-chip user-interface and power-control MCU. The 20 I/O lines directly drive 7-segment LED displays, capacitive touch buttons, and TRIAC/PFET heater or motor outputs, while the Slope A/D monitors NTC temperature sensors without an external ADC. The 7 KB OTP locks the cooking curve or appliance timing algorithm at production, eliminating field firmware tampering. The 28-SSOP surface-mount package reflows cleanly on consumer-appliance PCBs and offers sufficient creepage for reinforced-insulation mains-side designs.
Recommended
Automotive Interior Accessories (Non-Safety)
Non-safety automotive interior accessories such as ambient lighting controllers, seat-heater modules, and headrest-adjustment units can use the PIC14000T-04/SS where the commercial 0 C to +70 C temperature range is acceptable for cabin-mounted modules. The 8-bit core runs PWM for LED dimming and brushed-motor speed control at 200 ns instruction resolution, while the Slope A/D reads cabin temperature and seat-occupancy sensors. Compared with safety-critical automotive MCUs, the OTP-locked 7 KB program memory provides strong protection against warranty-fraud firmware swaps. Designers targeting true AEC-Q100 grades should migrate to PIC16F876A-I/SS or automotive-rated equivalents.
Recommended
Educational and Hobbyist Development
The PIC14000T-04/SS appears in university embedded-systems coursework because the PIC mid-range instruction set (35 single-word instructions) is teachable in a single semester, and the integrated Slope A/D exposes students to time-continuous ADC topologies rarely covered in standard MCU curricula. Despite being OTP, development cycles typically use a windowed or Flash sibling (PIC16F873A-I/SS in the same 28-SSOP package) for code iteration, then move to PIC14000T-04/SS for production lock. The 4 MHz clock and 20 I/O are sufficient for laboratory projects involving line-following robots, weather stations, and small CNC controllers.
Recommended
Recommended Products Summary
Engineering reference data for PIC14000T-04/SS β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC14000-04/SS | PIC16F876A-I/SS | PIC16F873A-I/SS |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SSOP | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same |
| Program Memory | 7 KB OTP | 7 KB OTP | 14 KB Flash | 7 KB Flash |
| Program Memory Type | OTP | OTP | Flash (re-programmable) | Flash (re-programmable) |
| RAM Size | 192 bytes | 192 bytes | 368 bytes | 192 bytes |
| I/O Pins | 20 | 20 | 22 | 22 |
| Max Clock Frequency | 4 MHz | 4 MHz | 20 MHz | 20 MHz |
| ADC Type | Slope A/D | Slope A/D | 10-bit SAR (5 channels) | 10-bit SAR (5 channels) |
| Operating Temperature | 0 C to +70 C | 0 C to +70 C | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) |
Key Differentiators
- Integrated Slope A/D converter eliminates external ADC (vs PIC16F876A-I/SS)
- OTP program memory locks firmware permanently (vs PIC16F873A-I/SS)
- Same-die drop-in compatibility with tube-packaged sibling (vs PIC14000-04/SS)
Design Notes
The PIC14000T-04/SS operates from a single 2.5 V to 5.5 V supply. Decouple VDD with a 100 nF ceramic capacitor placed within 5 mm of the VDD pin, and add a bulk 10 uF tantalum or aluminum-polymer capacitor if the supply is shared with switching loads (relays, TRIACs). The MCLR pin should be tied to VDD through a 10 kohm resistor with a 100 nF capacitor to VDD to provide a clean power-on reset; do not leave MCLR floating.
OTP program memory is one-time programmable - any bit error during production programming is permanent. Estimate: a typical production run programs 100% of parts, of which a 1-3% yield loss is normal. Always validate firmware on Flash-based siblings (PIC16F873A-I/SS in same 28-SSOP package) before committing to OTP production. The 'T' suffix in PIC14000T-04/SS indicates Tape & Reel packaging, not a temperature grade variant.
The 28-SSOP package has a 0.65 mm pin pitch - keep-out copper pour beneath the package body is not required, but a continuous ground plane on the top or bottom layer improves EMI/ESD performance for the Slope A/D analog inputs. Estimated: route the Slope A/D comparator traces (RC0-RC7) over a ground pour and keep them shorter than 25 mm to minimize leakage-induced offset error.
The integrated Slope A/D converter is sensitive to leakage currents at its analog inputs (RC0-RC7). Use guard rings tied to the same potential as the measured node when interfacing high-impedance sensors (greater than 1 Mohm). Estimate: a 1 nA leakage produces approximately 1 mV offset in a typical 1 Mohm source impedance - sufficient to dominate the converter's least-significant bit in many designs.
Compliance Information
Lead-free termination per Microchip SSOP-28 packaging standards. RoHS, REACH, halogen-free, and conflict-minerals status not explicitly stated in the verified web data; marked as unknown pending manufacturer datasheet confirmation.
