PIC16LC54A-04E/SS - 8-bit 4MHz 768B OTP MCU | Microchip SSOP-20
MPN: PIC16LC54A-04E/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.11 | $4.11 |
| 10 | $3.78 | $37.80 |
| 100 | $3.45 | $345.00 |
| 500 | $3.12 | $1,560.00 |
| 1,000 | $2.84 | $2,840.00 |
PIC16LC54A-04E/SS Overview
An 8-bit CMOS microcontroller is a single-chip computer that integrates CPU core, program memory, data RAM, and peripherals on one die. The PIC16LC54A belongs to the PIC16C5X family - the lowest-cost, OTP/EPROM-based branch of Microchip's PIC line - which sits within the broader taxonomy: 8-bit MCU -> microcontroller -> embedded controller -> semiconductor IC. The 'LC' suffix denotes a low-power CMOS variant, distinguishing it from the standard PIC16C54A, while the 'A' suffix denotes the improved silicon revision. This positioning makes the part a legacy workhorse for cost-sensitive embedded control.
Key features include a two-level deep hardware stack, direct/indirect/relative addressing modes, an 8-bit real-time clock/counter (TMR0), power-on reset (POR), watchdog timer (WDT), and 12 bidirectional I/O pins capable of sourcing/sinking 25 mA. Seven or eight special-function hardware registers accelerate context save/restore. The fully static core allows clock frequencies from DC to 4 MHz with zero standby current.
Architecturally, the device uses a Harvard architecture with separate program and data buses, enabling instruction fetch and operand read in a single cycle. The 12-bit instruction word encodes both opcode and literal operand, eliminating the need for a second instruction word and shrinking code footprint. An EPROM-based cell is used for the 512 x 12 program memory, programmed once via Microchip's development tools and irreversibly locked.
Typical applications include appliance controllers, simple sensor interfaces, battery chargers, LED drivers, and white-goods human-machine interface (HMI) replacements for electromechanical timers. Designers favor the part for its low cost, predictable interrupt latency, and long-term Microchip toolchain support across MPLAB IDE, MPASMX assembler, and XC8 C compiler.
A key design tip is to budget I/O pin current carefully: each pin can source/sink 25 mA but the VDD/VSS totals are limited, so multi-relay or LED-matrix loads require external driver transistors. Also, OTP memory cannot be erased - use the PIC16CR54A or PIC16F54 equivalents for flash-based prototyping during development.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical SSOP-20 design notes not found in the manufacturer datasheet - giving engineers a single reference for sourcing and design.
Drop-in alternatives for PIC16LC54A-04E/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 PIC16LC54A-04E/SS (same form factor and footprint) — differing in Core Architecture, Package, Program Memory Size, Program Memory Type, Family.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LC54A-04/SS
✅ Drop-In✓ In Stock
$3.85 / Unit
View Datasheet →PIC16LC54AT-04E/SS
✅ Drop-In✓ In Stock
$1.9 / Unit
View Datasheet →PIC16LC54AT-04/SS
✅ Drop-In✓ In Stock
$0.86 / Unit
View Datasheet →PIC16LC54A-04I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LC54A-04E/SS Maximum Ratings & Electrical Characteristics
| Family | PIC16C5X (PIC16LC54A) |
| Core Architecture | 8-bit RISC, Harvard |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 768 B (512 x 12 bits) |
| Data RAM | 25 B |
| Maximum Clock Speed | 4 MHz |
| Instruction Width | 12 bits |
| Supply Voltage (VDD) | 3.0 V to 6.25 V |
| I/O Pins | 12 |
| Timers | 1 x 8-bit (TMR0) |
| Hardware Stack | 2-level |
| Watchdog Timer (WDT) | Yes |
| Power-On Reset (POR) | Yes |
| Operating Temperature | -40C to +125C (E = Extended) |
| Package | 20-pin SSOP (0.209 in / 5.30 mm width) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited floor life at <30C/85% RH) |
| RoHS Status | Compliant |
| Lead-Free / Pb-Free | Yes |
PIC16LC54A-04E/SS Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (reset) input / programming voltage |
| Pin 2 | RA0 — Bidirectional digital I/O port A bit 0 |
| Pin 3 | RA1 — Bidirectional digital I/O port A bit 1 |
| Pin 4 | RA2 — Bidirectional digital I/O port A bit 2 |
| Pin 5 | RA3 — Bidirectional digital I/O port A bit 3 |
| Pin 6 | RB0 — Bidirectional digital I/O port B bit 0 |
| Pin 7 | RB1 — Bidirectional digital I/O port B bit 1 |
| Pin 8 | RB2 — Bidirectional digital I/O port B bit 2 |
| Pin 9 | RB3 — Bidirectional digital I/O port B bit 3 |
| Pin 10 | RB4 — Bidirectional digital I/O port B bit 4 |
| Pin 11 | RB5 — Bidirectional digital I/O port B bit 5 |
| Pin 12 | RB6 — Bidirectional digital I/O port B bit 6 |
| Pin 13 | RB7 — Bidirectional digital I/O port B bit 7 |
| Pin 14 | OSC1/CLKIN — Oscillator input / external clock input |
| Pin 15 | OSC2/CLKOUT — Oscillator output / clock output |
| Pin 16 | T0CKI — Timer0 external clock input |
| Pin 17 | NC — Not connected (per datasheet) |
| Pin 18 | NC — Not connected (per datasheet) |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply voltage (3.0 V to 6.25 V) |
Typical Applications
PIC16LC54A-04E/SS is suitable for 6 applications: White Goods Appliance Controller, Battery Charger State Controller, LED Display Driver and Chaser, Simple Sensor Interface Hub, Toy and Hobby Electronics, Automotive Interior Accessory Controller.
White Goods Appliance Controller
Replaces electromechanical timers and relays in washing machines, dishwashers, and microwave ovens. The PIC16LC54A-04E/SS's 4 MHz RISC core delivers 1 MIPS of deterministic execution, while its 12 high-current I/O pins (25 mA sink/source) directly drive relays, triacs, and LED indicators without external buffering. With 768 bytes of OTP and 25 bytes RAM, the MCU fits simple state machines for wash-cycle sequencing, door-lock interlocks, and user-button debouncing. The 3.0 V to 6.25 V supply range accommodates both 5 V and 3.3 V derived rails. Extended -40C to +125C operating range suits the hot back-panel environment of motor-driven appliances, and Microchip's >15-year PIC16C5X supply guarantee protects long-life consumer designs.
Recommended
Battery Charger State Controller
Implements CC/CV charge profiles for NiMH, Li-ion, or lead-acid packs using the PIC16LC54A-04E/SS as a low-cost supervisory MCU. The 4 MHz core handles ADC-free voltage/current sensing via comparator thresholds and PWM-driven MOSFET control. The 12 I/O pins connect directly to status LEDs, a button, a thermistor input via TMR0 capture, and relay/charge-enable outputs. The 'LC' low-power CMOS variant draws minimal quiescent current during the standby state, preserving battery shelf life. OTP memory locks the validated charge algorithm into production units, while the extended -40C to +125C range covers garage and outdoor charger enclosures. Microchip's PIC16C5X heritage ensures stable silicon supply for long product life cycles.
Recommended
LED Display Driver and Chaser
Drives 7-segment LED displays, dot-matrix marquees, or holiday-light chasers using the PIC16LC54A-04E/SS's high-current 25 mA I/O pins. The 4 MHz core executes multiplexed scan loops fast enough to refresh 8-digit displays without flicker. Each 25-byte RAM byte stores a frame buffer or pattern table, while 768-byte OTP holds animation sequences and lookup tables. The 12 I/O pins directly sink segment current via resistor networks or low-side MOSFETs, eliminating external LED drivers in simple designs. The watchdog timer (WDT) prevents lockup in unattended installations, and the 3.0 V to 6.25 V range covers both 5 V regulated supplies and 3.3 V battery operation. SSOP-20 packaging keeps the PCB footprint tiny for retail-display modules.
Recommended
Simple Sensor Interface Hub
Aggregates low-speed sensor data from thermistors, mechanical switches, and reed relays in HVAC, security, or industrial-automation nodes. The PIC16LC54A-04E/SS reads analog sensors via TMR0-gated RC timing and digital inputs via polled I/O, transmitting status on a single-wire UART-emulated pin. With 768 bytes of OTP, the MCU holds calibration tables for temperature compensation and hysteresis filtering. The hardware 2-level stack supports short interrupt-driven routines from the TMR0 overflow. The PIC16LC54A's low-power CMOS design draws negligible standby current between samples, making it suitable for solar or battery-powered remote sensor installations. SSOP-20 SMT packaging simplifies conformal-coated industrial board assembly.
Recommended
Toy and Hobby Electronics
Powers low-cost electronic toys, model railroad controllers, RC accessories, and hobbyist projects where cost dominates over feature density. The PIC16LC54A-04E/SS delivers enough MIPS to drive servo pulses, sound-effect playback, or motor-PWM control while staying under $5 unit price. Its 12 I/O lines support multi-channel servo or motor outputs, button inputs, and LED indicators in compact toy enclosures. OTP memory locks the final toy firmware against reverse engineering, while the 3.0 V to 6.25 V range accepts both 3 x AA batteries and Li-ion packs. Microchip's free MPLAB XC8 C compiler and PICkit programmer support hobbyists at zero tooling cost. SSOP-20 SMT packaging keeps PCB size small for handheld toys.
Recommended
Automotive Interior Accessory Controller
Replaces discrete logic in seat heaters, mirror adjusters, interior LED mood lighting, and aftermarket gauge clusters. The PIC16LC54A-04E/SS's extended -40C to +125C operating range handles the harsh cabin and engine-bay thermal environment, while its 12 I/O pins drive MOSFETs, relays, and indicator LEDs directly. The 4 MHz core executes PWM for LED dimming, switch debouncing, and fault detection without external timers. OTP memory locks calibration data and prevents firmware tampering. The 3.0 V to 6.25 V supply range tolerates automotive 12 V rail transients via external regulation. SSOP-20 SMT packaging is compatible with automated automotive PCB assembly lines. Microchip's PIC16C5X long-life supply policy matches automotive 10-15 year program horizons.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC54A-04E/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LC54A-04/SS | PIC16LC54AT-04E/SS | PIC16LC54AT-04/SS | PIC16LC54A-04I/SS |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-pin SSOP | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP - same |
| Program Memory | 768 B OTP (512 x 12) | 768 B OTP (512 x 12) - same | 768 B OTP (512 x 12) - same | 768 B OTP (512 x 12) - same | 768 B OTP (512 x 12) - same |
| Max Clock Speed | 4 MHz | 4 MHz - same | 4 MHz - same | 4 MHz - same | 4 MHz - same |
| Operating Temperature | -40C to +125C (Extended) | 0C to +70C (Commercial) | -40C to +125C (Extended) | 0C to +70C (Commercial) | -40C to +85C (Industrial) |
| Supply Voltage | 3.0 V to 6.25 V | 3.0 V to 6.25 V - same | 3.0 V to 6.25 V - same | 3.0 V to 6.25 V - same | 3.0 V to 6.25 V - same |
| I/O Pins | 12 | 12 - same | 12 - same | 12 - same | 12 - same |
| Packaging | Tube | Tube | Tape and Reel | Tape and Reel | Tube |
Key Differentiators
- Lowest-cost Microchip 8-bit MCU with extended -40C to +125C temperature range (vs PIC16LC54A-04I/SS)
- Tape-and-reel packaging variant available for automated SMT lines (vs PIC16LC54A-04/SS)
- Drop-in pin compatibility with full PIC16C5X family (vs PIC16F54-I/SS)
Design Notes
Place a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 20) and a bulk 10 uF tantalum or ceramic capacitor on the same supply trace. For SSOP-20 packages, route VSS (pin 19) directly to a ground plane via a short, wide trace - poor grounding on PIC16C5X parts causes erratic oscillator behavior and I/O pin glitches. Keep the oscillator traces (OSC1 pin 14, OSC2 pin 15) short and shielded by ground pour to reduce EMI pickup.
Do not confuse OTP (PIC16LC54A) with windowed EPROM (PIC16C54A/JW) or flash (PIC16F54) variants during sourcing. OTP parts cannot be erased - once programmed, they are locked for the life of the part. Always prototype firmware on a flash PIC16F54 or PIC16F57 with ICD header, then commit the verified .hex to the LC54A for production. The PIC16LC54A also lacks a debug interface - in-circuit emulation is impossible, so plan for thorough bench characterization before OTP programming.
The PIC16LC54A-04E/SS 'LC' variant draws significantly lower quiescent current than the standard 'C' variant, but at 4 MHz with all I/O switching, total current can still reach 2-5 mA. For battery-powered designs, place the MCU in SLEEP mode between sensor samples - the 2-level hardware stack and WDT allow wake-on-timer interrupts. Ensure MCLR (pin 1) is tied to VDD through a 10 kohm resistor with a 100 nF cap to ground for clean power-on reset behavior.
When migrating from PIC16C54A to PIC16LC54A, verify pinout compatibility at the schematic level - the SSOP-20 footprint is shared, but MCLR input threshold and oscillator transconductance differ slightly. For SSOP-20 SMT assembly, follow J-STD-020 MSL-1 floor-life guidelines (unlimited at <30C/85% RH). Hand-soldering SSOP-20 requires fine-tip iron, flux, and magnification - prefer reflow for production volumes.
Compliance Information
RoHS and REACH compliant per Microchip product page. Lead-free SSOP-20 package per J-STD-020 MSL-1. Not AEC-Q100 qualified; for automotive AEC-Q100 applications, consider PIC16F18446 or PIC18F family with automotive grade. Halogen-free per Microchip environmental compliance data.
