PIC14000-04/SS - 4MHz 8-bit Mixed Signal MCU 28-SSOP | Microchip
MPN: PIC14000-04/SS ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.95 | $6.95 |
| 10 | $6.25 | $62.50 |
| 100 | $5.55 | $555.00 |
| 500 | $4.95 | $2,475.00 |
| 1,000 | $4.4 | $4,400.00 |
PIC14000-04/SS Overview
A mixed-signal microcontroller (MSMCU) combines a traditional digital MCU core with high-precision analog peripherals on a single die. In system hierarchies, the PIC14000 belongs to: MCU -> microcontroller -> embedded controller -> semiconductor IC. The PIC® 14 family was specifically designed for closed-loop analog control applications where a discrete MCU plus op-amp + ADC + DAC chain would be too large or expensive.
Key differentiating features of the PIC14000-04/SS include its integrated 16-bit sigma-delta A/D converter (eliminating an external precision ADC), a programmable constant-current source for sensor excitation, on-chip bandgap reference with internal temperature sensor for self-monitoring, and LVD plus a voltage-regulator control PWM output that allows the device to act as the brain of a closed-loop switching supply. The 35-instruction RISC core is RISC architecture with Harvard bus and 200 ns instruction execution at 4 MHz.
Typical applications include switching power supply control (PFC, battery chargers), closed-loop battery chargers, sensor signal conditioning, programmable current sources, and standalone analog front ends where a low pin-count mixed-signal MCU replaces a larger MCU + external ADC.
When designing with this device, ensure the OTP programming step is budgeted into the production flow, as one-time-programmable memory cannot be field-updated. Decouple VDD with a 100 nF ceramic capacitor close to the pin and provide adequate bulk capacitance for the analog reference.
This page synthesizes Microchip product-page information, distributor pricing (Mouser, DigiKey), drop-in same-package alternatives from the PIC14000 product family, and practical design notes that go beyond the manufacturer datasheet.
Drop-in alternatives for PIC14000-04/SS — 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 PIC14000-04/SS (same form factor and footprint) — differing in Package, Mounting Type, Program Memory Type, Operating Temperature, Instruction Cycle Time.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC14000-04I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC14000T-04/SS
✅ Drop-In✓ In Stock
$2.32 / Unit
View Datasheet →PIC14000T-04I/SS
✅ Drop-In✓ In Stock
$2.4 / Unit
View Datasheet →PIC14000-04E/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC14000-04/SS Maximum Ratings & Electrical Characteristics
| Core | PIC |
| Core Size | 8-bit |
| Maximum Clock Frequency | 4 MHz |
| Instruction Cycle Time | 200 ns |
| Program Memory Type | OTP |
| Program Memory Size | 7 KB (4K x 14) |
| RAM Size | 192 x 8 bytes |
| EEPROM Size | None |
| Number of I/O | 20 |
| ADC Resolution | 16-bit sigma-delta |
| Supply Voltage (Vcc/Vdd) | 2.7 V to 6.0 V |
| Operating Temperature | 0C to +70C |
| Package | 28-SSOP (0.209", 5.30mm width) |
| Mounting Type | Surface Mount |
| Connectivity | I2C |
| Peripherals | POR, Temperature Sensor, WDT |
| Data Converters | 16-bit A/D (sigma-delta slope converter) |
| Oscillator Type | Internal |
| Instruction Set | 35 single-word instructions |
| RoHS Status | Compliant |
PIC14000-04/SS Pin Configuration
| Pin 1 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Pin 2 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Pin 3 | RA2/AN2/CVREF — PORTA bit 2 / analog input 2 / voltage reference output |
| Pin 4 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / VREF+ |
| Pin 5 | RA4/AN4 — PORTA bit 4 / analog input 4 |
| Pin 6 | RA5/AN5 — PORTA bit 5 / analog input 5 |
| Pin 7 | VSS — Ground reference |
| Pin 8 | OSC1 — Oscillator input |
| Pin 9 | OSC2 — Oscillator output |
| Pin 10 | RC0 — PORTC bit 0 |
| Pin 11 | RC1 — PORTC bit 1 |
| Pin 12 | RC2 — PORTC bit 2 |
| Pin 13 | RC3 — PORTC bit 3 |
| Pin 14 | RC4 — PORTC bit 4 |
| Pin 15 | RC5 — PORTC bit 5 |
| Pin 16 | RC6 — PORTC bit 6 |
| Pin 17 | RC7 — PORTC bit 7 |
| Pin 18 | RB0/INT — PORTB bit 0 / external interrupt |
| Pin 19 | RB1 — PORTB bit 1 |
| Pin 20 | RB2 — PORTB bit 2 |
| Pin 21 | RB3 — PORTB bit 3 |
| Pin 22 | RB4 — PORTB bit 4 |
| Pin 23 | RB5 — PORTB bit 5 |
| Pin 24 | RB6 — PORTB bit 6 |
| Pin 25 | RB7 — PORTB bit 7 |
| Pin 26 | VDD — Positive supply voltage |
| Pin 27 | VSS — Ground reference |
| Pin 28 | MCLR — Master clear (reset) input |
Typical Applications
PIC14000-04/SS is suitable for 6 applications: Switching Power Supply Control, Closed-Loop Battery Charger, Sensor Signal Conditioning, Programmable Current Source, Standalone Analog Front End, Power Supply Monitor with Voltage Reference.
Switching Power Supply Control
The PIC14000-04/SS serves as the digital control brain for closed-loop switching power supplies and PFC (Power Factor Correction) stages. Its 16-bit sigma-delta ADC samples output voltage and current with high resolution, the on-chip bandgap reference anchors regulation setpoints, and the integrated voltage-regulator PWM output drives an external MOSFET half-bridge directly. With 4 MHz CPU and 200 ns instruction execution, the device closes the regulation loop within a few microseconds - sufficient for 50 kHz to 250 kHz SMPS topologies. The 2.7 V to 6.0 V supply range accepts auxiliary windings directly, eliminating a separate regulator. Compared to a discrete MCU + external ADC + external op-amp solution, the PIC14000 collapses the analog front-end into one IC, reducing BOM cost and PCB area for industrial and consumer power designs.
Recommended
Closed-Loop Battery Charger
The PIC14000-04/SS is purpose-built for closed-loop battery charger topologies including Li-ion, NiMH, and lead-acid chemistries. The 4-bit programmable current source provides constant-current excitation for charging without an external DAC, while the 16-bit sigma-delta ADC measures battery voltage and charge current with the resolution needed for CC/CV (Constant Current / Constant Voltage) transition detection. The internal temperature sensor enables JEITA-style thermal foldback for Li-ion safety. With 192 bytes RAM and 7 KB OTP program space, charge algorithms including state-of-charge estimation, timer-based termination, and thermal protection fit comfortably. The commercial 0C to +70C range suits consumer charging products; industrial variants (PIC14000-04I/SS) extend to -40C to +85C for e-bike and industrial charger use cases.
Recommended
Sensor Signal Conditioning
The PIC14000-04/SS functions as an intelligent analog front-end for sensor signal conditioning in industrial and process-control systems. Its 4-bit programmable current source excites resistive sensors (RTDs, thermistors, bridge sensors) directly, the 16-bit sigma-delta ADC digitizes the differential signal at low noise, and the on-chip bandgap reference anchors ratiometric measurements. The internal temperature sensor enables ambient compensation and cold-junction compensation for thermocouple chains. The I2C peripheral provides a digital output to a host controller, and the 20 GPIO lines can drive status LEDs, alarms, or select multiplexing. Compared to a discrete op-amp + ADC + MCU chain, the PIC14000 integrates all analog functions into one IC for compact, low-noise sensor modules.
Recommended
Programmable Current Source
The PIC14000-04/SS implements a fully programmable current source for laboratory, test, and industrial applications requiring precise excitation. The integrated 4-bit programmable current source (combined with external pass transistor) delivers from sub-mA to multi-amp range under firmware control, while the 16-bit sigma-delta ADC measures actual load current for closed-loop accuracy. Engineers can implement staircase, ramp, or arbitrary waveform current profiles entirely in firmware. The internal bandgap reference ensures setpoint stability across temperature, and the I2C interface allows a host controller to command current levels digitally. This application replaces bulky bench-top current sources with a single-chip solution for embedded test equipment, semiconductor test, and sensor calibration fixtures.
Recommended
Standalone Analog Front End
The PIC14000-04/SS acts as a standalone analog front end (AFE) that digitizes analog signals and exposes them over I2C to a host system. The integrated 16-bit sigma-delta ADC, bandgap reference, programmable current source, and temperature sensor eliminate the need for separate ADC ICs in many designs. With 192 bytes RAM and 7 KB OTP program memory, simple on-chip digital filtering, linearization, and calibration routines run natively without host intervention. The 2.7 V to 6.0 V supply and 0C to +70C commercial range target industrial and consumer products. This application pattern enables modular product designs with a standardized I2C AFE that any host MCU can interface.
Recommended
Power Supply Monitor with Voltage Reference
The PIC14000-04/SS functions as a power supply monitor with on-chip voltage reference for server, telecom, and industrial -48 V or 24 V rail supervision applications. The LVD (Low Voltage Detect) peripheral alerts the system to brownout conditions, the integrated bandgap reference provides a precision threshold for accurate monitoring, and the temperature sensor enables system-level thermal management. The voltage-regulator PWM control output can drive an external housekeeping regulator. With I2C connectivity, the PIC14000 reports rail status to a host supervisor ASIC or BMC. Compared to discrete supervisor + reference ICs, the PIC14000 consolidates analog and digital housekeeping into one 28-SSOP package.
Recommended
Recommended Products Summary
Engineering reference data for PIC14000-04/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC14000-04I/SS | PIC14000T-04/SS | PIC14000T-04I/SS |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SSOP (5.30 mm) | 28-SSOP (5.30 mm) - same | 28-SSOP (5.30 mm) - same | 28-SSOP (5.30 mm) - same |
| Core | 8-bit PIC | 8-bit PIC | 8-bit PIC | 8-bit PIC |
| Max Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP |
| RAM Size | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
| Operating Temperature | 0C to +70C (commercial) | -40C to +85C (industrial) | 0C to +70C (commercial) | -40C to +85C (industrial) |
| Packaging Media | Tube | Tube | Tape & Reel | Tape & Reel |
Key Differentiators
- Integrated 16-bit sigma-delta ADC eliminates external precision ADC (vs PIC16F877A (10-bit ADC only))
- Integrated programmable current source for sensor excitation (vs PIC16F883 (no integrated current source))
- Voltage-regulator PWM control output for direct power stage drive (vs PIC12F675 (no PWM regulator output))
Design Notes
Decouple VDD (pin 26) with a 100 nF ceramic capacitor placed within 5 mm of the pin, plus a 10 uF bulk capacitor at the board supply entry. The PIC14000's analog bandgap reference and 16-bit sigma-delta ADC are sensitive to supply ripple; injecting switching noise on VDD directly couples into measurements. For switching power supply designs where the PIC14000 sits next to a high dv/dt MOSFET node, add an LC pi-filter (10 uF + ferrite bead + 100 nF) between the auxiliary winding and VDD to keep ripple below 50 mV peak-to-peak.
Route the analog signals (AN0-AN5, VREF+, CVREF, current source output) on a separate analog ground island that joins the digital ground only at the PIC14000's VSS pin (star-ground topology). Keep analog traces short and away from digital switching lines (OSC, PWM output). Place the bandgap reference bypass capacitor directly at the VREF+ pin with a 100 nF NPO/C0G dielectric, not X7R, to minimize reference drift across temperature.
OTP (One-Time Programmable) memory cannot be erased or rewritten - any firmware bug becomes a permanent production defect. Build an in-circuit emulator (ICE) or windowed UV-erasable prototype (PIC14000-04/JW ceramic windowed package) into development, validate firmware on multiple production units, and only commit to OTP programming for the final production run. Also note that the device is NRND as of 2026-09-16; new designs should evaluate PIC16F883 or PIC18F equivalents to avoid future obsolescence risk.
Estimated: at VDD=5 V, 4 MHz CPU active, IO driving 20 mA total, the PIC14000-04/SS dissipates approximately 125 mW worst-case. With 28-SSOP theta_JA around 95 C/W on a 1 square inch copper pour, junction temperature rises ~12 C above ambient - well within the 0C to +70C commercial range. For industrial-temperature applications using PIC14000-04I/SS at +85C ambient, ensure adequate copper pour to keep Tj below 125C; this is easily achieved with standard 2-layer FR4 layouts.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - PIC14000 is not designed for automotive applications. Lifecycle status: NRND (Not Recommended for new designs) as of 2026-09-16.
