PIC16CE624-20E/P - 8-Bit 20MHz OTP MCU w/EEPROM | Microchip
MPN: PIC16CE624-20E/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.45 | $3.45 |
| 10 | $3.12 | $31.20 |
| 100 | $2.78 | $278.00 |
| 500 | $2.45 | $1,225.00 |
| 1,000 | $2.18 | $2,180.00 |
PIC16CE624-20E/P Overview
An OTP microcontroller (One-Time-Programmable MCU) is a member of the microcontroller (MCU) family that sits within the broader category of embedded microcontrollers and embedded systems. It belongs to Microchip's PIC16C mid-range architecture, a RISC (Reduced Instruction Set Computer) architecture using a Harvard memory model. Unlike flash-based MCUs, OTP parts are programmed once by the user or factory and cannot be re-programmed in-circuit, making them suited for high-volume cost-sensitive products where firmware is finalized before production. The "E" in the part number designates the extended (-40C to +125C) automotive operating temperature grade, which is an important selection criterion versus the standard "I" (-40C to +85C) variant.
Key features include 13 digital I/O pins, 64 bytes of SRAM, two on-chip analog comparators, a programmable voltage reference, a watchdog timer with its own on-chip RC oscillator, brown-out reset, power-on reset, and an 8-bit timer/counter (TMR0). The 35 single-word instruction RISC core executes most instructions in a single 200 ns cycle, and the device runs from a single 3.0 V to 5.5 V supply. The instruction set is upwards-compatible with the PIC16C5X baseline and PIC12CXXX baseline devices, easing code migration for designers familiar with older PIC families.
Technically, the PIC16CE624 separates code and data buses (Harvard architecture), has a 14-bit-wide instruction word, and integrates analog peripherals directly on-chip, reducing external component count. Its 2 comparators can be tied to the programmable voltage reference to build simple ADC front-ends or battery monitors without an external analog IC.
Typical applications include automotive body controllers, appliance control boards, simple sensor signal conditioning with on-chip comparators, low-cost consumer remote controls, and replacement of discrete logic in white goods. The extended temperature grade specifically targets under-hood and automotive cabin modules.
When designing with this device, remember that OTP memory requires a one-time programmer and cannot be re-flashed - plan firmware development on a flash-based sibling (such as PIC16F684) before committing to the PIC16CE624 for production. Place a 0.1 uF decoupling capacitor as close as possible between VDD and VSS, and respect the 5.5 V absolute maximum on the supply rail to avoid EEPROM data corruption.
Drop-in alternatives for PIC16CE624-20E/P — 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 PIC16CE624-20E/P (same form factor and footprint) — differing in Mounting Type, Package, Program Memory Size, Program Memory Type, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16CE624-20I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16CE623-20I/P
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →PIC16CE624-04/P
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →PIC16CE624-20/P
✅ Drop-In✓ In Stock
$1.18 / Unit
View Datasheet →PIC16F84A-20I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16CE624-20E/P Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16C / PIC16 mid-range 8-bit RISC |
| Instruction Set Width | 14-bit |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 1.75 KB (1K x 14) |
| EEPROM Data Memory | 128 bytes |
| SRAM Data Memory | 64 bytes |
| Maximum Clock Frequency | 20 MHz |
| Instruction Cycle Time | 200 ns (single-cycle) |
| Supply Voltage (VDD) | 3.0 V to 5.5 V |
| I/O Pins | 13 |
| On-chip Comparators | 2 |
| Programmable Voltage Reference | Yes |
| Timers | TMR0 (8-bit) |
| Watchdog Timer | Yes (with dedicated on-chip RC oscillator) |
| Brown-out Reset | Yes |
| Power-on Reset | Yes |
| Operating Temperature Grade | Extended (E): -40C to +125C (automotive) |
| Package | 18-pin PDIP (300 mil, through-hole) |
| Mounting Type | Through-Hole (DIP) |
| RoHS Status | Compliant |
PIC16CE624-20E/P Pin Configuration
| Pin 1 | MCLR/Vpp — Master Clear (active low reset) / programming voltage input |
| Pin 2 | RA0/AN0 — Port A bit 0 / analog comparator input 0 |
| Pin 3 | RA1/AN1 — Port A bit 1 / analog comparator input 1 |
| Pin 4 | RA2/AN2 — Port A bit 2 / analog comparator input 2 |
| Pin 5 | RA3/AN3 — Port A bit 3 / analog comparator input 3 |
| Pin 6 | RA4/T0CKI — Port A bit 4 / TMR0 clock input (open-drain) |
| Pin 7 | RA5/SS — Port A bit 5 / slave select input |
| Pin 8 | OSC1/CLKIN — Crystal oscillator input / external clock input |
| Pin 9 | OSC2/CLKOUT — Crystal oscillator output / clock output |
| Pin 10 | VSS — Ground reference |
| Pin 11 | VDD — Positive supply voltage (3.0 V to 5.5 V) |
| Pin 12 | RB0/INT — Port B bit 0 / external interrupt input |
| Pin 13 | RB1 — Port B bit 1 |
| Pin 14 | RB2 — Port B bit 2 |
| Pin 15 | RB3 — Port B bit 3 |
| Pin 16 | RB4 — Port B bit 4 |
| Pin 17 | RB5 — Port B bit 5 |
| Pin 18 | RB6 — Port B bit 6 |
Typical Applications
PIC16CE624-20E/P is suitable for 7 applications: Automotive Body Control Modules, White Goods and Appliance Control, Battery-Operated Sensor Signal Conditioning, Low-Cost Consumer Remote Controls, Discrete Logic Replacement in Industrial Controls, Simple ADC Front-End Using On-Chip Comparators, Educational and Hobby Embedded Projects.
Automotive Body Control Modules
The PIC16CE624-20E/P is well suited to automotive body controllers because its extended -40C to +125C temperature grade survives under-hood and cabin thermal stress while the on-chip 2 comparators and programmable voltage reference can directly interface with analog sensors such as thermistors and battery monitors. Its 1.75KB OTP holds ~1K instructions - enough for typical body-control logic including door lock sequencing, wiper control, and lighting PWM. The 20 MHz clock yields a 200 ns instruction cycle that comfortably meets 10 ms-class response budgets. Compared with newer flash-based PIC16F-series MCUs the OTP variant cuts BOM cost by ~15-20% in high-volume automotive production where firmware is locked.
Recommended
White Goods and Appliance Control
Washing machines, dishwashers, microwave ovens and HVAC controllers commonly use the PIC16CE624-20E/P because its 13 digital I/O pins can directly drive seven-segment displays, relays, and triac interfaces without external glue logic. The 128-byte EEPROM stores user settings (timer presets, wash cycles) across power cycles with 1M write-cycle endurance. The integrated watchdog timer with its own RC oscillator provides fail-safe recovery from software lockup in unattended appliance environments. Brown-out reset prevents EEPROM corruption during brown-out events on noisy mains-derived supplies.
Recommended
Battery-Operated Sensor Signal Conditioning
The PIC16CE624-20E/P's two on-chip comparators combined with its programmable voltage reference enable a complete battery-monitoring or threshold-detection circuit without any external analog IC, reducing PCB area and BOM cost in wireless sensor nodes. The 3.0V minimum supply voltage matches single-cell Li-coin-cell chemistries directly. The low-power CMOS design and short 200 ns instruction cycle let the MCU wake, take a comparator reading, and return to sleep quickly - critical for battery-life-sensitive IoT edge devices. The 128-byte EEPROM can store calibration data per node.
Recommended
Low-Cost Consumer Remote Controls
Infrared and RF remote controls benefit from the PIC16CE624-20E/P's low unit cost, 1.75KB OTP for fixed IR/RF protocol stacks (RC5, NEC, proprietary), and 13 I/O for keypad scanning plus LED indicators. The 20 MHz instruction cycle supports standard 38 kHz IR carrier generation in software with timing headroom for protocol encoding. Its small 18-pin PDIP footprint enables slim remote form factors. The extended temperature grade supports outdoor gate-remote and garage-opener applications exposed to summer heat and winter cold.
Recommended
Discrete Logic Replacement in Industrial Controls
Industrial control boards that previously used dozens of 74-series logic ICs can be consolidated onto a single PIC16CE624-20E/P, replacing glue logic with firmware at lower cost and higher reliability. The 13 I/O pins handle multiple input signals (limit switches, sensors) and outputs (relays, solenoids, indicator LEDs). Brown-out reset and watchdog timer protect against industrial EMI events that cause logic glitches in discrete designs. The 35-instruction RISC core is small enough that legacy 74HC logic functions can be ported by technicians familiar with ladder logic but new to microcontrollers.
Recommended
Simple ADC Front-End Using On-Chip Comparators
The PIC16CE624-20E/P's two comparators plus programmable voltage reference form a complete dual-threshold analog monitor or a simple successive-approximation ADC front-end, replacing dedicated ADC ICs in cost-sensitive designs. Combined with firmware-driven reference switching, the part can resolve 8+ bits of measurement for thermistor bridges, photocells, or simple pressure sensors. The 200 ns instruction cycle provides 5 MIPS throughput, enough to read and process a comparator-based ADC sample in under 50 us - suitable for low-bandwidth sensor logging. The 64-byte SRAM holds scratch conversion state without needing external memory.
Recommended
Educational and Hobby Embedded Projects
The PIC16CE624-20E/P remains a useful teaching tool for embedded-systems courses covering OTP programming, RISC architectures, and on-chip peripherals, even though flash MCUs have largely replaced it in commercial designs. Its 18-pin PDIP form factor is breadboard-friendly and standard through-hole sockets simplify lab work. The 35-instruction RISC core is small enough for students to master in a single semester while still being powerful enough to build line-following robots, simple data loggers, and educational timer circuits. Compatibility with the PIC16F84A-P development environment allows students to prototype in flash and migrate to the OTP version for class-project final assemblies.
Recommended
Recommended Products Summary
Engineering reference data for PIC16CE624-20E/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16CE624-20I/P | PIC16CE623-20I/P | PIC16CE624-04/P | PIC16CE624-20/P | PIC16F84A-20I/P |
|---|---|---|---|---|---|---|
| Package | 18-pin PDIP (300 mil, through-hole) | 18-pin PDIP (same) | 18-pin PDIP (same) | 18-pin PDIP (same) | 18-pin PDIP (same) | 18-pin PDIP (same) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock | 20 MHz | 20 MHz | 20 MHz | 4 MHz | 20 MHz | 20 MHz |
| Temperature Grade | Extended (E): -40C to +125C | Industrial (I): -40C to +85C | Industrial (I): -40C to +85C | Extended (E): -40C to +125C | Commercial: 0C to +70C | Industrial (I): -40C to +85C |
| Program Memory Type | OTP (1.75 KB) | OTP (1.75 KB) | OTP (1.75 KB) | OTP (1.75 KB) | OTP (1.75 KB) | Flash (1.75 KB, re-programmable) |
| EEPROM Data Memory | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 64 bytes |
| On-chip Comparators | 2 | 2 | 0 | 2 | 2 | 0 |
| Programmable Vref | Yes | Yes | No | Yes | Yes | No |
Key Differentiators
- Extended automotive temperature grade (-40C to +125C) at 20 MHz clock (vs PIC16CE624-20I/P)
- Includes 2 on-chip analog comparators and programmable voltage reference (vs PIC16CE623-20I/P)
- Higher 128-byte EEPROM versus flash-based siblings' 64 bytes (vs PIC16F84A-20I/P)
Design Notes
Place a 0.1 uF decoupling capacitor as physically close as possible between VDD (pin 11) and VSS (pin 10), using short wide traces to minimize series inductance. For designs switching high-current loads via the I/O pins (relays, solenoids), add a bulk 10 uF aluminum or tantalum capacitor on the VDD rail within 1 inch of the MCU. The PIC16CE624-20E/P's brown-out reset triggers at ~2.5 V typical (per Microchip datasheet) and holds the device in reset until VDD rises to a valid level - never bypass this feature with a direct VDD tie. Estimated: at 20 MHz clock with all peripherals enabled, IDD is ~5 mA typical, so the decoupling network must handle this transient load.
Remember that the PIC16CE624 is OTP (One-Time-Programmable) - once programmed, the program memory cannot be erased or rewritten. The /P package has no quartz window, so even UV erasure is impossible. Always develop and debug firmware on a flash-based sibling such as the PIC16F84A (same 18-pin PDIP footprint, same PIC16 mid-range core) before committing to OTP programming. A single bad firmware revision on the OTP part means scrapping the entire batch of programmed MCUs - a costly mistake in production.
Keep the oscillator traces (OSC1/OSC2, pins 8 and 9) short and surrounded by a ground guard ring if using a crystal, to minimize stray capacitance and EMI pickup. For designs using the internal RC oscillator instead of an external crystal, leave OSC1 floating or tie to VDD through a 10 k resistor per Microchip recommendation. Place any reset network on MCLR (pin 1) within 0.5 inch of the pin and use a 10 k pull-up to VDD with an optional 100 nF cap to ground for a controlled rise time - this prevents false resets on noisy power-up transients common in automotive environments.
Compliance Information
RoHS compliant per Microchip product page. The -20E/P variant is automotive-grade temperature but is not formally AEC-Q100 qualified (use PIC16-Q1 parts for AEC-Q100); halogen-free status not stated in available data.
