PIC16LCE624-04I/SO - 8-bit OTP MCU, 4MHz, 1.75KB | Microchip
MPN: PIC16LCE624-04I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.5 | $1.50 |
| 10 | $1.4 | $14.00 |
| 100 | $1.25 | $125.00 |
| 500 | $1.1 | $550.00 |
| 1,000 | $0.98 | $980.00 |
PIC16LCE624-04I/SO Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and configurable peripheral blocks. The PIC16 family is built around Microchip's proprietary Harvard RISC core, which separates program and data buses for deterministic instruction throughput - one instruction per clock cycle (except branches), making timing straightforward. PIC microcontrollers sit within the broader hierarchy of embedded microcontrollers -> microcontrollers -> embedded processors -> semiconductors.
Key differentiating features include on-chip Brown-out Reset (BOR), Power-on Reset (POR), and a Watchdog Timer (WDT) for autonomous recovery in harsh environments. The OTP program memory is programmed once with a device programmer, making the part ideal for low-to-medium volume production where firmware is fixed and Flash reprogrammability is not required. The wide 2.5-5.5 V supply range simplifies battery-backed and unregulated-rail designs.
The PIC16LCE624-04I/SO uses a 14-bit instruction word and 8-bit data path, with a 35-instruction set optimized for compiled C and hand-written assembly. Its RISC architecture delivers predictable interrupt latency, which is important for motor-control and sensor-timing applications. The part integrates 13 general-purpose I/O lines that share pins with the analog comparator, capture/compare/PWM, and timer peripherals.
Typical applications include appliance controls, security and alarm panels, low-end consumer white goods, automotive body electronics (non-safety), remote controls, and sensor interface boards. The 4 MHz clock speed and 96-byte RAM are well matched to state-machine firmware and polling-based sensor reads.
When designing, ensure the OTP programming step is added to the manufacturing flow - OTP parts cannot be re-programmed in-circuit. Decouple VDD with 100 nF close to the pin, and reserve the MCLR pin function if in-system debugging is required.
This page synthesizes verified distributor pricing, pin-compatible alternatives, and engineering design notes not found in the standalone manufacturer datasheet.
Drop-in alternatives for PIC16LCE624-04I/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 PIC16LCE624-04I/SO (same form factor and footprint) — differing in Package, MSL Level, Core Architecture, Instruction Set, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LCE624-04I/P
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →PIC16LCE624-04/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LCE624-04E/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LCE624-04/SS
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →PIC16LCE623-04/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LCE625-04/SO
✅ Drop-In✓ In Stock
$2.09 / Unit
View Datasheet →PIC16LCE624-04I/SO Maximum Ratings & Electrical Characteristics
| Core Processor | PIC |
| Core Size | 8-Bit |
| Series | PIC 16C |
| Clock Speed (Max) | 4 MHz |
| Program Memory Size | 1.75 KB (1K x 14) OTP |
| RAM Size | 96 bytes |
| Number of I/O | 13 |
| Supply Voltage Range | 2.5 V to 5.5 V |
| Operating Temperature Range | -40 °C to +85 °C |
| Connectivity | UART/USART |
| Peripherals | Brown-out Detect/Reset, POR, WDT |
| Package | 18-SOIC (SOIC-18) |
| Mounting Type | Surface Mount |
| Instruction Set Width | 14-bit |
| Program Memory Type | OTP (One-Time Programmable) |
| Data EEPROM | Not present (OTP variant) |
| RoHS Status | Compliant |
| MSL Level | 1 (Unlimited) |
PIC16LCE624-04I/SO Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (reset) input / programming voltage |
| Pin 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Pin 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input 2 / voltage reference minus |
| Pin 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / voltage reference plus |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/OSC1/CLKIN — PORTA bit 5 / oscillator input / external clock |
| Pin 8 | RB0/INT — PORTB bit 0 / external interrupt |
| Pin 9 | RB1 — PORTB bit 1 |
| Pin 10 | RB2 — PORTB bit 2 |
| Pin 11 | RB3 — PORTB bit 3 |
| Pin 12 | RB4 — PORTB bit 4 |
| Pin 13 | RB5 — PORTB bit 5 |
| Pin 14 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 15 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 16 | OSC2/CLKOUT — Oscillator output / clock out |
| Pin 17 | VSS — Ground |
| Pin 18 | VDD — Positive supply voltage |
Typical Applications
PIC16LCE624-04I/SO is suitable for 7 applications: Appliance Control Boards, Security and Alarm Panels, Remote Control Transmitters, Sensor Interface Boards, Automotive Body Electronics (Non-Safety), Low-End Consumer White Goods, Industrial Timer and Sequencer Modules.
Appliance Control Boards
The PIC16LCE624-04I/SO fits appliance controls because its 1.75 KB OTP holds fixed control firmware (relay sequencing, timer logic, sensor polling), its 2.5-5.5 V supply range accommodates rectified mains-derived rails with minimal regulation, and its 4 MHz / 1 MIPS performance is sufficient for state-machine control loops. The on-chip Watchdog Timer recovers from firmware lockups caused by EMI from compressor or motor switching, while Brown-out Reset prevents undefined behaviour during brown-outs from heavy inrush loads. The 13 digital I/O pins multiplex with the analog comparator and USART, enabling direct drive of relays, triac optocouplers, and UART displays without external glue logic.
Recommended
Security and Alarm Panels
In security panels, the PIC16LCE624-04I/SO provides deterministic loop timing essential for keypad scanning, sensor debouncing, and siren-pattern generation. Its 96-byte RAM is ample for zone-state tracking and event buffers, while the 14-bit instruction word keeps the loop counters and timer tick code compact. Brown-out Reset and Power-on Reset guarantee the panel starts in a defined state after power glitches, critical for UL-listed alarm systems. The OTP memory prevents firmware reverse-engineering through firmware extraction, a tamper-resistance benefit valued in security products. The -40 to +85 °C industrial temperature range covers attic, basement, and unconditioned-space installations.
Recommended
Remote Control Transmitters
For IR/RF remote controls, the PIC16LCE624-04I/SO delivers ultra-low standby current when the Watchdog Timer is the only active peripheral, extending coin-cell battery life to multi-year durations. The 4 MHz oscillator supports 38 kHz carrier generation for IR protocols without external components, and 96-byte RAM is enough for protocol state buffers (NEC, RC5, Sony SIRC). The 13 I/O pins drive keypad matrices, LED indicators, and IR LEDs directly, minimizing BOM cost. OTP memory prevents competitive cloning of the protocol stack in cost-sensitive consumer remote designs.
Recommended
Sensor Interface Boards
The PIC16LCE624-04I/SO interfaces with low-bandwidth analog and digital sensors through its analog comparator and digital I/O, with the 35-instruction RISC set enabling tight timing loops for pulse-counting flow meters or thermistor bridges. Its 2.5-5.5 V supply matches single-cell Li-ion and 3.3 V regulated rails directly, simplifying battery-powered sensor nodes. Brown-out Reset and Watchdog Timer ensure fielded sensors recover from electrical noise on long cable runs. The 1.75 KB OTP holds sensor linearization tables and modest communication protocol stacks (Modbus RTU slave, for example).
Recommended
Automotive Body Electronics (Non-Safety)
For non-safety body modules (interior lighting, seat controllers, accessory drivers), the PIC16LCE624-04I/SO operates from a regulated 5 V or 3.3 V body-domain rail and handles switch debouncing, PWM LED dimming, and LIN slave communication. The 4 MHz clock supports LIN 1.x protocol timing at 19.2 kbaud, while the 13 I/O pins drive multiple LED channels and switch inputs. The -40 to +85 °C temperature range covers cabin and under-hood-near applications. Note that AEC-Q100 Grade 0 variants would be required for under-hood safety applications; this standard part suits accessory body electronics per Microchip datasheet DS30214E.
Recommended
Low-End Consumer White Goods
Cost-sensitive white goods (small fans, simple coffee makers, basic washing-machine control boards) benefit from the PIC16LCE624-04I/SO's OTP memory pricing and small SOIC-18 footprint. The 1 MIPS performance runs keypad scanning, triac phase-angle control, and buzzer patterns in a single firmware image, and the 96-byte RAM is sufficient for state machines tracking button presses and timer values. Brown-out Reset and Watchdog Timer are essential for products exposed to mains transients and inductive kickback from motors, while the 2.5-5.5 V supply range accepts unregulated DC rails from capacitive-drop power supplies.
Recommended
Industrial Timer and Sequencer Modules
The PIC16LCE624-04I/SO serves as a flexible sequencer in industrial timer modules where deterministic execution matters. Its 4 MHz / 1 MIPS throughput handles multi-stage timing chains, its USART interfaces with operator panels, and its analog comparator provides threshold detection on sensor inputs. OTP memory locks the timing profile to prevent unauthorized parameter changes. The 13 I/O pins drive relay coils, status LEDs, and input switches directly, and the industrial -40 to +85 °C range covers factory-floor enclosures without additional thermal protection per Microchip datasheet DS30214E.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LCE624-04I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LCE624-04I/P | PIC16LCE624-04/SO | PIC16LCE624-04E/SO | PIC16LCE624-04/SS |
|---|---|---|---|---|---|
| Package | SOIC-18 (300 mil) | PDIP-18 - same pinout, through-hole | SOIC-18 - same, commercial temp | SOIC-18 - same, enhanced temp | SSOP-18 - same pinout, smaller SMT |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP |
| RAM Size | 96 bytes | 96 bytes | 96 bytes | 96 bytes | 96 bytes |
| Clock Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| I/O Pins | 13 | 13 | 13 | 13 | 13 |
| Supply Voltage | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V |
| Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | 0 °C to +70 °C | -40 °C to +125 °C | -40 °C to +85 °C |
| Memory Type | OTP (one-time) | OTP (one-time) | OTP (one-time) | OTP (one-time) | OTP (one-time) |
Key Differentiators
- Low-voltage 2.5 V operation with full industrial temperature range (vs PIC16CE624-04/SO)
- Industrial -40 to +85 °C temperature grade for harsh environments (vs PIC16LCE624-04/SO (commercial grade))
- One-Time Programmable memory locks firmware and prevents cloning (vs PIC16F630-I/SL (Flash))
Design Notes
Place a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 18) with a ground return to VSS (pin 17). For applications with significant digital switching noise, add a 10 µF bulk capacitor near the supply input. The PIC16LCE624-04I/SO draws typically 2-5 mA active at 4 MHz / 5 V; in Sleep mode the current drops to microampere range with Watchdog Timer enabled.
Route the MCLR/VPP pin (pin 1) directly to the programming connector; do not add series resistance exceeding 100 Ω as it can prevent reliable ICSP programming. Keep the OSC1/OSC2 traces short and surround them with a ground pour to reduce EMI coupling to adjacent analog inputs. The RB6/PGC and RB7/PGD pins (14, 15) are used for In-Circuit Serial Programming - keep their traces short and avoid passing noisy signals near them.
OTP parts cannot be re-programmed in-circuit: a single programming failure or wrong firmware image bricks the part. Always program a known-good golden unit first and verify before volume programming. The 'L' suffix is critical for low-voltage designs - omitting it yields the PIC16CE624 which requires 4.0-6.0 V and will not start at 3.3 V. Configuration word bits (oscillator, watchdog, code protect) must be set correctly at programming time; a wrong watchdog setting can disable the firmware reset.
Compliance Information
RoHS compliant per LCSC and DigiKey listings. Not AEC-Q100 qualified - this part is intended for industrial and consumer applications, not automotive safety. Lead-free reflow compatible.
