PIC16CE625-04/SO - 8-Bit 4MHz OTP MCU 3.5KB | Microchip
MPN: PIC16CE625-04/SO β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.12 | $6.12 |
| 10 | $5.48 | $54.80 |
| 100 | $4.85 | $485.00 |
| 500 | $4.21 | $2,105.00 |
| 1,000 | $3.74 | $3,740.00 |
PIC16CE625-04/SO Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, volatile data memory (RAM), and configurable peripheral I/O. MCUs are categorized by data bus width (8-bit, 16-bit, 32-bit), instruction architecture (CISC vs RISC), and memory technology (Flash, OTP, ROM, EEPROM). The PIC16C family uses a 14-bit-wide RISC instruction set optimized for low-cost, deterministic embedded control.
Key features include 35 single-word instructions, single-cycle execution except for program branches (two-cycle), an external oscillator interface, and CMOS technology for low-power operation. The OTP program memory is one-time programmable, making the part ideal for production volumes where firmware is finalized and code-update is not required. Integrated EEPROM data memory allows non-volatile storage of calibration constants, configuration data, or user settings that survive power cycles.
The PIC16CE625-04/SO uses a Harvard architecture with separate program and data buses, a 13-bit program counter capable of addressing 8K x 14 of program memory, and an 8-level deep hardware stack. The CMOS process combined with PIC's RISC design yields predictable timing and low standby current. Peripherals include one 8-bit timer/counter (Timer0) with an 8-bit prescaler, a Watchdog Timer with its own on-chip RC oscillator for reliable operation, and programmable code protection.
Typical applications include appliance control, sensor signal conditioning front-ends, simple user-interface controllers, battery chargers, low-cost consumer electronics, and industrial control subsystems where mature 8-bit processing and EEPROM-backed parameter storage are required.
When designing with the PIC16CE625-04/SO, note that OTP memory cannot be re-programmed; for development, use a windowed ceramic package variant (PIC16CE625-04/JW) or migrate to the flash-based PIC16F628A for prototype work, then transition to OTP for cost-optimized production runs.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes that complement - but do not replace - the manufacturer datasheet.
Drop-in alternatives for PIC16CE625-04/SO 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 PIC16CE625-04/SO (same form factor and footprint) β differing in Operating Temperature Range, Package, Program Memory Size, Program Memory Type, RoHS Status.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16CE625-04E/SO
β Drop-Inβ In Stock
$5.1 / Unit
View Datasheet βPIC16CE625-20/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16CE625T-04E/SO
β Drop-Inβ In Stock
$1.85 / Unit
View Datasheet βPIC16CE625-04I/SO
β Drop-Inβ In Stock
$2.45 / Unit
View Datasheet βPIC16CE624-04/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16CE623-04/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16CE625-04/SO Maximum Ratings & Electrical Characteristics
| Core Processor | PIC |
| Core Size | 8-Bit |
| Maximum Clock Speed | 4 MHz |
| Instruction Cycle Time | 200 ns (single-cycle) |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 3.5 KB (2K x 14) |
| EEPROM Data Memory Size | 128 x 8 bytes |
| RAM Size | 128 x 8 bytes |
| Number of I/O Pins | 13 |
| Supply Voltage (Vcc/Vdd) | 3.0 V to 5.5 V |
| Oscillator Type | External |
| Peripherals | Brown-out Detect/Reset, POR, WDT |
| Number of Instructions | 35 single-word |
| Package | 18-SOIC (0.295 inch, 7.50 mm width) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | 0C to +70C (commercial) |
| RoHS Status | Compliant |
PIC16CE625-04/SO Pin Configuration
| Pin 1 | RA2 β Digital I/O port A bit 2 |
| Pin 2 | RA3 β Digital I/O port A bit 3 |
| Pin 3 | RA4/T0CKI β Digital I/O port A bit 4 / Timer0 clock input |
| Pin 4 | MCLR β Master clear reset input (active low) |
| Pin 5 | VSS β Ground reference |
| Pin 6 | RB0/INT β Digital I/O port B bit 0 / external interrupt input |
| Pin 7 | RB1 β Digital I/O port B bit 1 |
| Pin 8 | RB2 β Digital I/O port B bit 2 |
| Pin 9 | RB3 β Digital I/O port B bit 3 |
| Pin 10 | RB4 β Digital I/O port B bit 4 |
| Pin 11 | RB5 β Digital I/O port B bit 5 |
| Pin 12 | RB6 β Digital I/O port B bit 6 |
| Pin 13 | RB7 β Digital I/O port B bit 7 |
| Pin 14 | VDD β Positive supply voltage (3.0V to 5.5V) |
| Pin 15 | OSC2/CLKOUT β Oscillator crystal output / clock output |
| Pin 16 | OSC1/CLKIN β Oscillator crystal input / external clock input |
| Pin 17 | RA0 β Digital I/O port A bit 0 |
| Pin 18 | RA1 β Digital I/O port A bit 1 |
Typical Applications
PIC16CE625-04/SO is suitable for 6 applications: Appliance Control Subsystems, Battery-Powered Sensor Front-Ends, User Interface Controllers, Battery Chargers, Low-Cost Consumer Electronics, Industrial Control Subsystems.
Appliance Control Subsystems
The PIC16CE625-04/SO fits appliance control subsystems such as washing-machine timer boards, microwave user-interface controllers, and refrigerator sensor hubs. Its 13 digital I/O pins directly drive seven-segment displays, keypads, and relay coils without external logic, while the integrated 128-byte EEPROM stores user-selected cycles, calibration offsets, and fault logs across power cycles. At 4MHz the 200ns instruction cycle handles keypad scanning, debounce, and relay sequencing in real time. The 3.0-5.5V supply range accepts rectified 5V rails from low-cost transformer supplies, and the brown-out reset prevents corruption of EEPROM during brown-out events on noisy AC mains.
Recommended
Battery-Powered Sensor Front-Ends
The PIC16CE625-04/SO is well suited to battery-powered sensor front-ends including remote thermostats, smoke-detector signal conditioners, and wireless sensor node controllers. The CMOS process combined with PIC's RISC design yields sub-mA active current at 4MHz, extending battery life in low-duty-cycle applications. The 128-byte EEPROM stores calibration coefficients for thermistor or thermopile sensors, eliminating per-unit trimming in production. Brown-out detect/reset ensures the MCU enters a known state when the battery voltage sags at end-of-life, preventing erroneous sensor readings. The 13 I/O connect directly to SPI or I2C sensor peripherals, low-battery indicator LEDs, and sleep-mode wake-up switches.
Recommended
User Interface Controllers
The PIC16CE625-04/SO drives simple user-interface controllers such as numeric keypads, LED status indicators, and rotary-encoder inputs in industrial HMI panels. Its 13 I/O pins are sufficient to scan a 4x4 matrix keypad (8 lines) plus drive 4 status LEDs with PWM via Timer0, or read a quadrature encoder (2 lines) plus 8 discrete outputs. The 3.5KB OTP holds menu-state machines and debounce routines for robust user input. EEPROM stores last-set values and operator preferences that must persist across power cycles. At 4MHz the part responds to key presses in under 1ms, well below human-perceptible latency.
Recommended
Battery Chargers
The PIC16CE625-04/SO controls NiCd, NiMH, and small lithium-ion battery chargers in consumer and industrial products. The 13 I/O pins drive charge FETs, monitor charge current via comparator inputs, and read battery voltage through discrete resistor dividers. The 128-byte EEPROM logs charge-cycle counts and last-full-charge timestamps for battery-health diagnostics. The integrated watchdog timer recovers from firmware lockup if a noise transient corrupts program flow, critical in charger safety paths. At 4MHz the part implements -dV termination, temperature-slope detection, and timer-based backup termination in a single MCU.
Recommended
Low-Cost Consumer Electronics
The PIC16CE625-04/SO powers low-cost consumer electronics including toy controllers, decorative LED displays, novelty electronics, educational kits, and remote-control key fobs. OTP memory enables sub-$1.50 unit cost at high volume, which is critical in price-sensitive consumer markets. The 3.5KB program memory holds full feature sets including button debounce, LED patterns, sound playback timing, and sleep-mode wake-up logic. The integrated 128-byte EEPROM stores user settings such as volume, mode, and timer values. Brown-out reset prevents bricking during battery insertion transients in mass-produced consumer units.
Recommended
Industrial Control Subsystems
The PIC16CE625-04/SO handles industrial control subsystems such as motor starter logic, conveyor-belt sequencing, valve controllers, and process-indicator panels. The 13 I/O pins interface to optocouplers, 24V signal-conditioning circuits, and relay-driver outputs common in factory automation. The brown-out detect/reset and watchdog timer with its own on-chip RC oscillator provide robust operation in electrically noisy industrial environments. The 128-byte EEPROM retains machine-state parameters through power cycles, avoiding re-setup after unplanned shutdowns. At 4MHz with 200ns instruction cycle, the part implements deterministic ladder-logic replacement with scan times well below 10ms.
Recommended
Recommended Products Summary
Engineering reference data for PIC16CE625-04/SO β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16CE625-04E/SO | PIC16CE625-20/SO | PIC16CE625T-04E/SO | PIC16CE624-04/SO | PIC16CE623-04/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-SOIC (0.295 inch, 7.50 mm) | 18-SOIC (0.295 inch, 7.50 mm) - same | 18-SOIC (0.295 inch, 7.50 mm) - same | 18-SOIC (0.295 inch, 7.50 mm) - same | 18-SOIC (0.295 inch, 7.50 mm) - same | 18-SOIC (0.295 inch, 7.50 mm) - same |
| Maximum Clock Speed | 4 MHz | 4 MHz | 20 MHz | 4 MHz | 4 MHz | 4 MHz |
| Program Memory Size | 3.5 KB (2K x 14) OTP | 3.5 KB (2K x 14) OTP | 3.5 KB (2K x 14) OTP | 3.5 KB (2K x 14) OTP | 2 KB (1K x 14) OTP | 896 B (512 x 14) OTP |
| EEPROM Data Memory | 128 x 8 bytes | 128 x 8 bytes | 128 x 8 bytes | 128 x 8 bytes | 128 x 8 bytes | 128 x 8 bytes |
| RAM Size | 128 x 8 bytes | 128 x 8 bytes | 128 x 8 bytes | 128 x 8 bytes | 128 x 8 bytes | 128 x 8 bytes |
| Number of I/O | 13 | 13 | 13 | 13 | 13 | 13 |
| Operating Temperature | 0C to +70C | -40C to +125C | 0C to +70C | -40C to +125C | 0C to +70C | 0C to +70C |
| Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
Key Differentiators
- On-chip 128-byte EEPROM for non-volatile parameter storage (vs PIC16CE623-04/SO)
- OTP cost advantage for high-volume production (vs PIC16F628A (Flash-based))
- Same-family upgrade to 20MHz for higher throughput (vs PIC16CE625-20/SO)
Design Notes
The PIC16CE625-04/SO operates from 3.0V to 5.5V on a single VDD pin (pin 14). Place a 100nF decoupling capacitor as close as possible to VDD, with a 10uF bulk capacitor on the supply rail. The integrated brown-out detect/reset holds the MCU in reset when VDD drops below the configured threshold, preventing EEPROM corruption during power-down. For battery applications, include a Schottky diode to block reverse-polarity connection - the absence of internal protection means reverse voltage on VDD permanently damages the part.
OTP program memory cannot be re-programmed once written. Use the windowed ceramic PIC16CE625-04/JW variant or the flash-based PIC16F628A for prototype development, then transition to the SOIC-18 OTP part for production. Verify all firmware functionality on the development part before committing to OTP programming - a single bit error in OTP code requires board rework. The MCLR pin (pin 4) must be tied to VDD through a 10kOhm resistor for normal operation; leaving MCLR floating causes intermittent resets.
The 18-pin SOIC package requires a 1.27mm pitch SOIC land pattern with pad dimensions of approximately 0.55mm x 1.9mm per JEDEC MO-012. Route the OSC1/OSC2 traces (pins 15-16) short and symmetric to minimize stray capacitance - keep traces under 5mm and use a ground guard ring around the crystal or resonator to reduce EMI susceptibility. The MCLR trace (pin 4) should also be kept short to prevent false reset triggering from capacitive coupling to switching nodes.
All 13 digital I/O pins have TTL-compatible input thresholds and CMOS output drive. Pin RA4 (pin 3) is open-drain and requires an external pull-up resistor for high-level output. Port B pins RB0-RB7 feature software-configurable weak pull-ups, eliminating external resistors for simple keypad or switch inputs. When driving LEDs directly, limit pin current to 25mA per pin and 90mA total port current to stay within absolute maximum ratings per the Microchip datasheet.
Compliance Information
RoHS and lead-free per Microchip product page. Not AEC-Q100 qualified - this is a commercial-grade 8-bit MCU intended for non-automotive applications.