PIC12LCE519T-04I/SN - 8-bit OTP MCU, 1.5KB, 6 I/O, SOIC-8 | Microchip
MPN: PIC12LCE519T-04I/SN ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.7709 | $0.77 |
| 10 | $0.72 | $7.20 |
| 100 | $0.65 | $65.00 |
| 500 | $0.58 | $290.00 |
| 1,000 | $0.52 | $520.00 |
PIC12LCE519T-04I/SN Overview
An 8-bit microcontroller (MCU) is a single-chip computer with an 8-bit data bus, ALU, program ROM, data RAM, and integrated peripherals. MCUs sit within the broader category of microcontrollers -> embedded processors -> semiconductors. The PIC12C/12CE family occupies the entry-level tier of the PIC architecture hierarchy, optimized for cost-sensitive, pin-constrained applications such as appliance controls, sensor interfaces, and consumer electronics. The OTP variant (vs. flash) is one-time programmable but supports EEPROM data memory for user-variable storage, a useful split for low-cost production where firmware is fixed at mask time but calibration constants must still be field-adjustable.
Key features of the PIC12LCE519T-04I/SN include its 33 single-word RISC instruction set (vs. 35-50 on competitive CISC 8-bit MCUs), the integrated EEPROM data memory, the dedicated WDT RC oscillator that keeps the watchdog running even in sleep, and the low pin count of 6 I/O that enables designs in tiny SOIC-8 outlines. The "L" prefix denotes the low-voltage (2.5 V min) variant, and "04" specifies the 4 MHz oscillator maximum.
Typical applications include low-cost remote control transmitters, thermostat front-end controllers, small appliance user interfaces, sensor signal conditioning with on-chip calibration, LED driver controllers, and battery-powered timers. The 2.5 V minimum supply extends battery life in 2-cell alkaline or single-cell lithium chemistries.
When designing with this part, note that OTP memory cannot be reprogrammed in the field — use the PIC12F519 flash-based cousin for prototype or low-volume runs, then move to the PIC12LCE519 for cost-down production. The 41-byte RAM is small; recursive C compilers should be avoided in favor of assembly or tightly-written C.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC12LCE519T-04I/SN — 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 PIC12LCE519T-04I/SN (same form factor and footprint) — differing in Core Architecture, Package, Data EEPROM, Timers, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC12F519-I/SN
✅ Drop-In✓ In Stock
$0.54 / Unit
View Datasheet →PIC12CE519-04I/SN
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →PIC12LCE519-04I/SN
✅ Drop-In✓ In Stock
$1.78 / Unit
View Datasheet →PIC12CE519T-04/SN
✅ Drop-In✓ In Stock
$1.05 / Unit
View Datasheet →PIC12CE518T-04I/SN
✅ Drop-In✓ In Stock
$1.55 / Unit
View Datasheet →PIC12LCE518T-04I/SN
✅ Drop-In✓ In Stock
$1.45 / Unit
View Datasheet →PIC12LCE519T-04I/SN Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC |
| Program Memory | 1.5 KB (1K x 12) OTP |
| Data RAM | 41 bytes |
| Maximum Clock Frequency | 4 MHz |
| Instruction Cycle Time | 1 µs |
| Supply Voltage Range | 2.5 V to 5.5 V |
| I/O Pins | 6 |
| Timers | 8-bit Timer0 with 8-bit programmable prescaler |
| Watchdog Timer | Yes, with dedicated on-chip RC oscillator |
| Power-On Reset | Yes (POR) |
| Device Reset Timer | Yes (DRT) |
| Instruction Set | 33 single-word instructions |
| Operating Temperature Range | -40 °C to +85 °C (industrial, "I" suffix) |
| Package | 8-pin SOIC (SN), tape and reel |
| Mounting Type | Surface Mount |
PIC12LCE519T-04I/SN Pin Configuration
| Pin 1 | GP2/MCLR/VPP — General-purpose I/O / Master Clear (reset) input / Programming voltage |
| Pin 2 | GP0 — General-purpose I/O, ICSPDAT |
| Pin 3 | GP1 — General-purpose I/O, ICSPCLK |
| Pin 4 | GP3 — General-purpose I/O only (input-only on this pin) |
| Pin 5 | VSS — Ground reference |
| Pin 6 | GP5/OSC1/CLKIN — General-purpose I/O / Oscillator crystal input / External clock input |
| Pin 7 | GP4/OSC2/CLKOUT — General-purpose I/O / Oscillator crystal output / Clock output |
| Pin 8 | VDD — Positive supply voltage (2.5 V to 5.5 V) |
Typical Applications
PIC12LCE519T-04I/SN is suitable for 6 applications: Low-Cost Remote Control Transmitter, Thermostat Front-End Controller, Small Appliance User Interface, Battery-Powered Sensor Interface, LED Driver Controller, Industrial Timer / Delay Relay.
Low-Cost Remote Control Transmitter
The PIC12LCE519T-04I/SN fits remote-control transmitter designs because its 6 I/O pins can drive 3-4 button inputs plus an IR LED output through a transistor, while the 1.5 KB OTP holds a complete Manchester or RC5 encoder routine. The 33-instruction RISC core executes the encoder loop in well under 1 ms per packet, leaving the 4 MHz clock headroom for debouncing. The 2.5 V minimum supply lets the design run directly from a single CR2032 coin cell (3 V nominal), eliminating boost regulators. Internal EEPROM stores user-set pairing codes that persist across battery swaps. Industrial -40 to +85 °C range supports garage-door openers and outdoor keyfobs.
Recommended
Thermostat Front-End Controller
The PIC12LCE519T-04I/SN serves as the front-end controller in thermostat designs by reading temperature from an external sensor via one ADC-less GPIO and switching HVAC relays through the remaining I/O. The on-chip EEPROM stores setpoint schedules and calibration offsets, while the watchdog timer prevents lockup in unattended HVAC equipment. Power-on reset ensures clean startup after power blinks, critical for heating systems. The 41-byte RAM is sufficient for a state machine with 4 modes (off/heat/cool/auto). Industrial temperature range supports attic-mounted equipment, and the SOIC-8 footprint fits behind a small display module.
Recommended
Small Appliance User Interface
In small appliances such as coffee makers, toasters, or bread machines, the PIC12LCE519T-04I/SN manages button inputs, drives LED indicators, and times cooking cycles using its 8-bit Timer0. The OTP memory locks the appliance firmware at production, preventing field tampering, while EEPROM retains user preferences (toast darkness, brew strength) across power cycles. Six I/O pins are adequate for 3-4 buttons and 2-3 status LEDs. The 2.5-5.5 V supply range supports direct connection to rectified 5 V or 3.3 V rails without additional regulation. The industrial temperature rating handles under-cabinet heat.
Recommended
Battery-Powered Sensor Interface
The PIC12LCE519T-04I/SN interfaces analog sensors in battery-powered applications by digitizing slow-changing signals through comparator or RC-time techniques on its GPIO, avoiding the cost of an external ADC. The "L" low-voltage variant operates from 2.5 V, enabling 2x AA or AAA alkaline battery operation for 2-3 years of life when the MCU spends most of its time in sleep. The dedicated watchdog RC oscillator keeps the WDT running independently of the system clock, a key feature for low-power designs that disable the main oscillator during sleep. EEPROM stores calibration data.
Recommended
LED Driver Controller
The PIC12LCE519T-04I/SN controls LED drivers in decorative lighting and signage by generating PWM dimming signals on one or two GPIO pins while reading button inputs on the others. The 4 MHz clock provides sufficient PWM frequency (>1 kHz) to avoid visible flicker even at low duty cycles. Six I/O pins support RGB color control (3 PWM channels) plus mode selection buttons. The 2.5 V minimum supply enables direct battery operation in portable LED fixtures. Internal EEPROM can store user-selected color presets and brightness levels that persist when the device is powered off.
Recommended
Industrial Timer / Delay Relay
The PIC12LCE519T-04I/SN implements industrial timing functions including delayed turn-on, sequential cascade, and watchdog-style process timers. The 8-bit Timer0 with programmable prescaler supports timing intervals from microseconds to minutes in software loops. The watchdog timer with its own RC oscillator ensures the timing function recovers from any code lockup, a safety requirement in industrial control. Power-on reset guarantees deterministic startup, and the industrial -40 to +85 °C range handles factory floor environments. Six I/O pins handle start/stop inputs plus 1-2 relay outputs.
Recommended
Recommended Products Summary
Engineering reference data for PIC12LCE519T-04I/SN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC12F519-I/SN | PIC12CE519-04I/SN | PIC12CE518T-04I/SN |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 8-pin SOIC (SN) | 8-pin SOIC (SN) - same | 8-pin SOIC (SN) - same | 8-pin SOIC (SN) - same |
| Program Memory Type | OTP (1.5 KB) | Flash (1.5 KB) - upgrade | OTP (1.5 KB) - identical | OTP (768 bytes) - smaller |
| Program Memory Size | 1.5 KB | 1.5 KB | 1.5 KB | 768 bytes |
| Data RAM | 41 bytes | 41 bytes | 41 bytes | 41 bytes |
| Max Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Supply Voltage Range | 2.5 V to 5.5 V | 2.0 V to 5.5 V - wider | 2.5 V to 5.5 V | 2.5 V to 5.5 V |
| I/O Pins | 6 | 6 | 6 | 6 |
| Operating Temperature Range | -40 °C to +85 °C (industrial) | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
Key Differentiators
- Industrial -40 to +85 °C temperature range (vs PIC12CE519T-04/SN)
- Field-reprogrammability via flash memory (vs PIC12LCE519T-04I/SN (this) vs PIC12F519-I/SN (alt))
- 1.5 KB program memory vs. 768 bytes (vs PIC12CE518T-04I/SN)
Design Notes
The PIC12LCE519T-04I/SN operating from 2.5 V enables direct 2x AA alkaline battery operation, but decoupling is still required: place a 100 nF ceramic capacitor within 5 mm of the VDD pin (pin 8) and a 10 µF bulk capacitor on the battery side. For sleep-mode designs, the WDT continues running from its dedicated internal RC oscillator, consuming approximately 1-2 µA; the main oscillator can be shut down to reduce total quiescent current to under 5 µA. Always sequence MCLR (pin 1) carefully — leave it floating only if no external reset is required, otherwise use the internal POR.
GPIO pin GP3 (pin 4) on the PIC12 baseline family is input-only and cannot be configured as an output — attempting TRIS manipulation will read back but not drive. Confirm I/O assignments in the datasheet before laying out PCB. Additionally, MCLR is shared with GP2 and VPP; if MCLR is enabled in the configuration word, GP2 functionality is restricted. Always set the configuration bits explicitly in code to avoid surprises: oscillator selection, watchdog enable/disable, code protection, and MCLR pin function.
The 8-pin SOIC (SN) package has a recommended land pattern of 0.050-inch pitch with pads approximately 0.090 × 0.020 inches. Place a ground pour under the IC and stitch vias around the perimeter for thermal dissipation and EMI control. Keep high-speed traces (crystal, clock output) short and surrounded by ground; for 4 MHz operation, trace length is not critical, but for the PIC12CE519-10 variant at 10 MHz, keep crystal traces under 10 mm. Route MCLR with a 10 kΩ pull-up if external reset is used; do not leave it floating.
Compliance Information
RoHS and REACH compliant per Microchip product page. Lead-free and halogen-free per datasheet. Not AEC-Q100 qualified — this is a baseline 8-bit MCU for industrial/consumer applications, not automotive.
