PIC16CE625-04I/SO - 8-Bit 4MHz OTP MCU with EEPROM | Microchip
MPN: PIC16CE625-04I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.13 | $4.13 |
| 10 | $3.75 | $37.50 |
| 100 | $3.2 | $320.00 |
| 500 | $2.78 | $1,390.00 |
| 1,000 | $2.45 | $2,450.00 |
PIC16CE625-04I/SO Overview
An 8-bit microcontroller (MCU) is a small, self-contained computer-on-a-chip that combines a CPU, RAM, program memory, and peripherals on a single die. The PIC16CE62X family belongs to the broader taxonomy: microcontroller -> embedded controller -> semiconductor device. These MCUs are widely used as glue logic, sensor interfaces, and low-cost control processors where deterministic instruction timing and minimal external components are valued. The on-chip EEPROM distinguishes the 'CE' variants from the baseline 'C' parts by providing non-volatile byte-programmable storage for user data and calibration constants.
Key features of the PIC16CE625-04I/SO include 128 bytes of RAM, a 35-instruction RISC-like instruction set, single-cycle execution (except branches which take two cycles), an integrated watchdog timer, an 8-bit timer/counter, and an analog comparator. The device operates from 3.0 V to 5.5 V supply, supports in-circuit serial programming (ICSP) via the RB6/RB7 pins, and provides a power-on reset with brown-out detection options depending on the configuration.
Architecturally, the PIC16CE625 uses a Harvard-style design with separate program and data buses, which allows instruction fetch and operand access to occur in the same clock cycle. The 14-bit instruction word packs an opcode plus literal/address data, giving better code density than 8-bit CISC alternatives. The 128-byte EEPROM is byte-erasable and rated for >1M erase/write cycles, far exceeding typical Flash endurance.
Typical applications for the PIC16CE625-04I/SO include consumer appliance controls, simple sensor interfaces, LED driver controllers, automotive body electronics (using the 'I' industrial grade), and battery-powered instrumentation. The wide 3.0 V to 5.5 V supply range also suits 4-cell battery packs and regulated 5 V rails.
When designing with this OTP part, remember that program memory is one-time programmable - firmware bugs cannot be patched. Provision a Flash-based PIC16F alternative for prototyping and only commit to the OTP CE variant for volume production where the cost savings justify the lack of field re-programmability.
This page synthesizes distributor pricing from Heisener, LCSC, DigiKey, and Mouser, drop-in alternatives within the PIC16CE62X family, and practical design notes not found in the bare manufacturer datasheet.
Drop-in alternatives for PIC16CE625-04I/SO — 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 PIC16CE625-04I/SO (same form factor and footprint) — differing in Instruction Cycle Time, Package, Program Memory Size, RoHS Status, Program Memory Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16CE625-04/SO
✅ Drop-In✓ In Stock
$3.74 / Unit
View Datasheet →PIC16CE625-04E/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16CE625T-04I/SO
✅ Drop-In✓ In Stock
$2.45 / Unit
View Datasheet →PIC16CE624-04I/SO
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →PIC16CE623-04I/SO
✅ Drop-In✓ In Stock
$1.31 / Unit
View Datasheet →PIC16CE625-04I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16CE625-04I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit Harvard |
| Family | PIC16CE62X (PIC16C core with EEPROM) |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 3.5 KB (2K x 14 instructions) |
| Data EEPROM | 128 bytes |
| RAM | 128 bytes |
| Maximum Clock Frequency | 4 MHz |
| Instruction Cycle Time | 200 ns (single cycle) |
| Supply Voltage Range | 3.0 V to 5.5 V |
| I/O Pins | 13 |
| Operating Temperature Range | -40 C to +85 C (Industrial, 'I' suffix) |
| Package | 18-SOIC (7.50 mm / 0.295 in width) |
| Mounting Type | Surface Mount |
| A/D Converters | None (no ADC on this variant) |
| Timers | Watchdog Timer (WDT) + 8-bit Timer0 (TMR0) |
| On-chip Peripherals | Analog comparator, EEPROM data memory |
| Instruction Set | 35 single-word instructions |
| Programming Interface | ICSP via RB6/RB7 |
| RoHS Status | Compliant (per Microchip product page) |
| Lead-Free | Yes |
PIC16CE625-04I/SO Pin Configuration
| Pin 1 | MCLR — Master Clear (reset) input; can also be used as a digital input |
| Pin 2 | RA0 — Bidirectional I/O pin / analog comparator input |
| Pin 3 | RA1 — Bidirectional I/O pin / analog comparator input |
| Pin 4 | RA2 — Bidirectional I/O pin / analog comparator output |
| Pin 5 | RA3 — Bidirectional I/O pin / analog comparator input |
| Pin 6 | RA4 — Bidirectional I/O pin / T0CKI timer0 clock input (open-drain output) |
| Pin 7 | RA5 — Bidirectional I/O pin |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1 — Oscillator input / external clock input |
| Pin 10 | OSC2 — Oscillator output (crystal/RC mode) or CLKOUT |
| Pin 11 | RC0 — Bidirectional I/O pin / T1OSO timer1 oscillator output |
| Pin 12 | RC1 — Bidirectional I/O pin / T1OSI timer1 oscillator input |
| Pin 13 | RC2 — Bidirectional I/O pin |
| Pin 14 | RC3 — Bidirectional I/O pin |
| Pin 15 | RC4 — Bidirectional I/O pin |
| Pin 16 | RC5 — Bidirectional I/O pin |
| Pin 17 | RB6 — Bidirectional I/O pin / ICSP clock (programming) |
| Pin 18 | RB7 — Bidirectional I/O pin / ICSP data (programming) |
Typical Applications
PIC16CE625-04I/SO is suitable for 6 applications: Consumer Appliance Control, Sensor Interface and Signal Conditioning, LED Lighting Controllers, Automotive Body Electronics (Industrial Grade), Battery-Powered Instrumentation, Remote Control and IR Transmitter.
Consumer Appliance Control
The PIC16CE625-04I/SO is well-suited to consumer appliance controllers (rice cookers, microwave ovens, washing machine control boards) thanks to its 3.5 KB OTP program memory, 128 bytes of byte-erasable EEPROM, and 13 general-purpose I/O pins. The EEPROM stores user-set calibration values and last-used settings across power cycles without battery backup, while the OTP holds the fixed firmware. The 3.0 V to 5.5 V supply range accepts the unregulated 5 V rails common in appliance power supplies, and the 4 MHz clock keeps EMI low compared to faster MCUs. Industrial temperature grade (-40 C to +85 C) tolerates the warm, humid conditions inside kitchen enclosures.
Recommended
Sensor Interface and Signal Conditioning
In battery-powered sensor nodes, the PIC16CE625-04I/SO acts as the central controller that reads analog sensors through its on-chip analog comparator, runs simple filtering algorithms, and transmits results. The on-chip comparator eliminates the need for an external op-amp in low-accuracy applications such as thermistor-to-digital conversion or threshold detection. The 128-byte EEPROM records calibration coefficients, while the 35-instruction RISC set ensures deterministic loop timing critical for digital filtering. At 4 MHz clock, the MCU draws a few mA active and can be put into sleep mode for long battery life.
Recommended
LED Lighting Controllers
The PIC16CE625-04I/SO drives LED arrays in decorative lighting, signage, and architectural fixtures by generating PWM outputs on its I/O pins. Although this variant lacks a dedicated PWM module, the 35-instruction set and 200 ns instruction cycle make software PWM at modest frequencies straightforward, dimming up to 13 channels in source or sink configurations. The 3.0 V to 5.5 V supply range accommodates common 5 V LED drivers, and the EEPROM stores user-programmed scenes and brightness presets. The industrial temperature grade allows deployment in outdoor enclosed luminaires.
Recommended
Automotive Body Electronics (Industrial Grade)
The PIC16CE625-04I/SO's industrial temperature range (-40 C to +85 C) and 18-SOIC surface-mount package make it acceptable for non-safety automotive body modules such as window lift controllers, mirror adjusters, and interior lighting controllers. The 128-byte EEPROM logs fault codes and end-of-line calibration data, and the 35-instruction RISC core executes deterministic control loops for brushed DC motor PWM. While the part is not AEC-Q100 qualified for under-hood use, it is widely deployed in cabin-mounted modules where automotive OEMs accept industrial-grade silicon for low-risk functions.
Recommended
Battery-Powered Instrumentation
Battery-powered instruments such as handheld multimeters, digital calipers, and portable test equipment use the PIC16CE625-04I/SO because of its low active current at 4 MHz, low-power sleep modes, and 3.0 V minimum supply that matches 2- or 3-cell alkaline packs. The 128-byte EEPROM retains measurement history and user settings without draining the battery, and the 13 I/O pins drive LCD segments directly via external resistor biasing. The OTP program memory ensures the firmware cannot be accidentally erased in the field, providing firmware integrity assurance for calibrated instruments.
Recommended
Remote Control and IR Transmitter
Consumer IR remote controls and RF transmitter key fobs use the PIC16CE625-04I/SO for its low cost, small 18-SOIC footprint, and 128-byte EEPROM that stores device pairing codes. The MCU generates 38 kHz carrier PWM via software timing loops accurate to within a few percent of nominal, sufficient for NEC, RC5, and SIRC protocols. The 3.0 V supply works from coin cells, and the on-chip watchdog timer recovers the device from ESD-induced lockups common on handheld remotes.
Recommended
Recommended Products Summary
Engineering reference data for PIC16CE625-04I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16CE625-04/SO | PIC16CE624-04I/SO | PIC16CE623-04I/SO |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-SOIC (7.50mm) | 18-SOIC (7.50mm) - same | 18-SOIC (7.50mm) - same | 18-SOIC (7.50mm) - same |
| Program Memory | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP | 2.0 KB OTP |
| RAM | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
| EEPROM Data Memory | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
| Maximum Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Temperature Grade | Industrial -40C to +85C | Commercial 0C to +70C | Industrial -40C to +85C | Industrial -40C to +85C |
| I/O Pins | 13 | 13 | 13 | 13 |
Key Differentiators
- Integrated 128-byte byte-erasable EEPROM on chip (vs PIC16C625 (non-CE baseline))
- Industrial temperature grade at the same price point as commercial (vs PIC16CE625-04/SO (commercial grade))
- Industry-standard 18-pin SOIC footprint shared across PIC16CE62X family (vs PIC16CE623-04I/SO (2 KB program memory))
Design Notes
The PIC16CE625-04I/SO uses OTP (One-Time Programmable) program memory - firmware cannot be erased or rewritten in-circuit. This is intentional for high-volume production to reduce cost, but during prototyping engineers should use the Flash-based PIC16F628A or PIC16F818 as a development surrogate. Verify the entire firmware on the Flash part before committing to the OTP CE variant; any firmware bug becomes a bricked device in the field.
Place the ICSP programming header footprint (5-pin standard: VPP/VDD/VSS/PGC/PGD) even on production boards. Field firmware bugs discovered after deployment cannot be fixed on the OTP part, so consider designing with a footprint that accepts a Flash-based PIC16F628A-I/SO as a contingency substitute. A 0.1 uF decoupling capacitor must be placed within 5 mm of the VDD pin; a bulk 10 uF tantalum or ceramic is recommended on the VDD rail.
Estimated: at 4 MHz clock and 5 V supply, the PIC16CE625-04I/SO draws approximately 2-5 mA active current and under 1 uA in sleep mode. For battery-powered designs, leverage the sleep mode aggressively and use the watchdog timer (WDT) to wake the device at fixed intervals. The MCLR pin should be tied to VDD through a 10 kohm resistor with a 100 nF cap to ground for proper power-on reset behavior.
Compliance Information
RoHS and REACH compliant per Microchip product page. Industrial temperature grade (-40C to +85C) is not equivalent to AEC-Q100 automotive qualification; for under-hood or safety-critical automotive applications select an AEC-Q100 qualified PIC16F variant instead.
