PIC16LC621T-04E/SO - 8-Bit PIC MCU, 4MHz, 1.75KB OTP, 18-SOIC | Microchip
N.º de pieza: PIC16LC621T-04E/SO ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $4.2 | $4,20 |
| 10 | $3.78 | $37,80 |
| 100 | $3.36 | $336,00 |
| 500 | $2.95 | $1.475,00 |
| 1.000 | $2.62 | $2.620,00 |
PIC16LC621T-04E/SO Descripción general
What is a PIC microcontroller? A PIC microcontroller (Peripheral Interface Controller) is a family of microcontrollers manufactured by Microchip Technology, built on a Harvard architecture with separate program and data buses. The 16C sub-family was an early OTP-based series, predating the flash-based PIC16F series. PIC microcontrollers integrate a CPU core, program memory (ROM/OTP/Flash), data RAM, EEPROM, and a configurable set of peripherals (I/O, timers, ADC, comparators) into a single IC, making them self-contained embedded controllers for products that need deterministic real-time behavior.
Key features of the PIC16LC621T-04E/SO include 13 I/O pins, Brown-out Detect/Reset (BOD), Power-On Reset (POR), Watchdog Timer (WDT), and an externally driven oscillator. The 'LC' voltage class supports an operating voltage range typically from 2.5V to 6.25V, enabling battery and 5V-rail designs. The 18-SOIC (SO) package is the standard 0.300" wide SOIC body, well suited to hand-soldering and moderate-density PCB layouts.
The device uses a 12-bit instruction word with an 8-bit data path, seven or eight special function hardware registers, and a two-level deep hardware stack. Direct, indirect, and relative addressing modes are supported. Combined with its 4MHz maximum clock, the architecture delivers predictable instruction timing suitable for small-loop control, sensor interfacing, and appliance-grade logic replacement.
Typical applications include simple appliance controls, sensor signal conditioning front-ends, LED indicator drivers, low-cost consumer remote controls, and industrial logic-replacement circuits. With 80 bytes of RAM and OTP program memory, the device fits tightly-scoped tasks where in-field re-programmability is not required.
When designing with this OTP part, plan code carefully before programming because OTP cannot be erased or rewritten. Ensure the watchdog timer is correctly configured in software to recover from fault conditions, and validate brown-out reset threshold behavior across your supply tolerance.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes for the PIC16LC621T-04E/SO, complementing the Microchip datasheet with engineering context not available on standalone product pages.
Alternativas directas para PIC16LC621T-04E/SO — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con PIC16LC621T-04E/SO (mismo factor de forma y huella) — difiere en Program Memory Size, Operating Temperature Range, Package, Program Memory Type, RAM Size.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
PIC16LC621-04E/SO
✅ Sustitución directa✓ En stock
$1.18 / unidad
Ver hoja de datos →PIC16LC621A-04E/SO
✅ Sustitución directa✓ En stock
$2.25 / unidad
Ver hoja de datos →PIC16LC621AT-04I/SO
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$1.55 / unidad
Ver hoja de datos →PIC16LC620AT-04E/SO
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$2.25 / unidad
Ver hoja de datos →PIC16LC620A-04E/SO
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$2.07 / unidad
Ver hoja de datos →PIC16LC621T-04E/SO Valores máximos y características eléctricas
| Core | PIC 8-bit |
| Family | PIC® 16C |
| Clock Speed (Maximum) | 4 MHz |
| Program Memory Size | 1.75 KB (1K x 14) |
| Program Memory Type | OTP (One-Time Programmable) |
| RAM Size | 80 bytes |
| I/O Pins | 13 |
| Supply Voltage Range | 2.5 V to 6.25 V |
| Instruction Word Width | 12 bits |
| Data Path Width | 8 bits |
| Hardware Stack Depth | 2 levels |
| Oscillator Type | External |
| Brown-out Detect/Reset | Yes |
| Power-On Reset (POR) | Yes |
| Watchdog Timer (WDT) | Yes |
| Encapsulado | 18-SOIC (0.300", SO-18) |
| Tipo de montaje | Surface Mount |
| Rango de temperatura de funcionamiento | -40C to +125C (Extended) |
| Packaging | Tape & Reel (T suffix) |
Configuración de pines de PIC16LC621T-04E/SO
| Pin 1 | RA2 — Bidirectional I/O port A bit 2 |
| Pin 2 | RA3 — Bidirectional I/O port A bit 3 |
| Pin 3 | RA4/T0CKI — Bidirectional I/O port A bit 4 / Timer0 clock input |
| Pin 4 | MCLR — Master Clear (Reset) input, active low |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — Bidirectional I/O port B bit 0 / External interrupt |
| Pin 7 | RB1 — Bidirectional I/O port B bit 1 (also analog comparator input on some revisions) |
| Pin 8 | RB2 — Bidirectional I/O port B bit 2 |
| Pin 9 | RB3 — Bidirectional I/O port B bit 3 (also analog comparator input on some revisions) |
| Pin 10 | RB4 — Bidirectional I/O port B bit 4 |
| Pin 11 | RB5 — Bidirectional I/O port B bit 5 |
| Pin 12 | RB6 — Bidirectional I/O port B bit 6 |
| Pin 13 | RB7 — Bidirectional I/O port B bit 7 |
| Pin 14 | VDD — Positive supply voltage (2.5 V to 6.25 V) |
| Pin 15 | OSC2/CLKOUT — Oscillator crystal output / Clockout |
| Pin 16 | OSC1/CLKIN — Oscillator crystal input / External clock input |
| Pin 17 | RA0 — Bidirectional I/O port A bit 0 |
| Pin 18 | RA1 — Bidirectional I/O port A bit 1 |
Aplicaciones típicas
PIC16LC621T-04E/SO es adecuado para 6 aplicacións: Simple Appliance Control, Sensor Signal Conditioning Front-End, LED Indicator and Driver Controller, Low-Cost Consumer Remote Control, Industrial Logic-Replacement Module, Battery-Powered Smart Sensor Node.
Simple Appliance Control
The PIC16LC621T-04E/SO fits low-cost appliance controls where deterministic loop timing and small code size are sufficient. Its 4MHz clock and 12-bit instruction set give predictable execution timing for relay, valve, and indicator sequencing, while the 1.75KB OTP program memory holds fixed firmware like wash-cycle or fan-speed state machines. With 13 I/O pins it directly drives indicator LEDs, opto-isolated triac interfaces, and AC-zero-cross detectors, replacing discrete logic. Brown-out Detect/Reset and the Watchdog Timer add the fault recovery required by IEC 60730-class safety expectations in white goods. Power consumption stays low across the 2.5V-6.25V supply range, so it operates on either rectified 5V or battery backup without regulator rework.
Recomendado
Sensor Signal Conditioning Front-End
In sensor signal conditioning front-ends, the PIC16LC621T-04E/SO serves as a digital post-processing stage that reads conditioned analog signals, applies calibration, and transmits results via simple protocols. Its 8-bit data core and 80-byte RAM handle table-based linearization for thermocouple, RTD, or strain-gauge channels with update rates matched to thermal/mechanical inertia. The 4MHz clock and 12-bit instructions execute simple averaging and alarm-threshold logic within tight sample windows. Brown-out Detect protects calibration tables against low-battery brown-out during field deployment, and the Watchdog Timer recovers from electrical-noise-induced code-flow faults common near motors and solenoids.
Recomendado
LED Indicator and Driver Controller
The PIC16LC621T-04E/SO is well matched to LED indicator and driver controller boards in industrial panels, signage, and status displays. Each of its 13 I/O pins can source/sink an LED directly, with software PWM generating brightness and fade patterns at the 4MHz instruction rate - more than sufficient for human-perceptible effects. The 1.75KB OTP memory stores animation sequences and color tables, while 80 bytes of RAM buffers current frame state. Brown-out Reset prevents flicker during supply dips, and the extended -40C to +125C temperature range supports outdoor enclosures and under-hood automotive cabins. Compared with discrete 555-timer LED blinker chains, the PIC16LC621T-04E/SO consolidates timing, sequence, and brightness logic into a single IC.
Recomendado
Low-Cost Consumer Remote Control
The PIC16LC621T-04E/SO supports compact IR/RF remote controls for TVs, set-top boxes, fans, and lighting where unit cost and battery life dominate. Operating from 2.5V to 6.25V, it runs directly from two AAA cells without a regulator, and its CMOS core keeps quiescent draw low between button events. The OTP 1.75KB memory stores the protocol state machine and key map, while the Watchdog Timer recovers the remote if a static-discharge event corrupts program flow. Its 13 I/O pins accommodate a 4x4 matrix keypad plus an IR LED driver, leaving headroom for status LEDs. For manufacturers shipping tens of thousands of units, OTP programming provides the lowest unit cost while still allowing per-customer firmware customization at production time.
Recomendado
Industrial Logic-Replacement Module
In industrial logic-replacement modules, the PIC16LC621T-04E/SO substitutes a small 74HC-series glue-logic array with a single programmable device. Designers encode state machines for conveyor interlocks, packaging-machine sequencing, and pump/HVAC control using the 1K x 14 OTP program memory, eliminating the cost and rework overhead of multiple discrete gates. With 13 I/O, the part covers typical input-count needs, and its extended -40C to +125C operating range handles factory-floor temperatures. The Watchdog Timer and Brown-out Detect provide the supervisory functions that discrete logic cannot, satisfying industrial reliability expectations. For OEMs modernizing older 74-series-based designs, this PIC delivers firmware flexibility within the same 18-SOIC footprint.
Recomendado
Battery-Powered Smart Sensor Node
The PIC16LC621T-04E/SO is appropriate for battery-powered smart sensor nodes where the application code is finalized and OTP cost savings outweigh flash flexibility. Drawing minimal current from a 2.5V-6.25V supply, the device sleeps between sensor reads while the Watchdog Timer wakes it on a periodic basis to sample and transmit. With 80 bytes of RAM it buffers short sensor payloads, and 13 I/O pins connect directly to a thermistor, photodiode, or low-power digital sensor. Brown-out Reset protects against end-of-battery brown-out conditions, and the extended temperature range suits outdoor and cold-chain deployments. Compared with flash PICs, this OTP variant trims unit cost for high-volume disposable or semi-disposable sensor products.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para PIC16LC621T-04E/SO — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | PIC16LC621-04E/SO | PIC16LC621A-04E/SO | PIC16LC621AT-04I/SO | PIC16LC620AT-04E/SO | PIC16LC620A-04E/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-SOIC (0.300") | 18-SOIC (0.300") - same | 18-SOIC (0.300") - same | 18-SOIC (0.300") - same | 18-SOIC (0.300") - same | 18-SOIC (0.300") - same |
| Program Memory | 1.75 KB (1K x 14) OTP | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP | 0.875 KB OTP (-50%) | 0.875 KB OTP (-50%) |
| RAM Size | 80 bytes | 80 bytes | 80 bytes | 80 bytes | 64 bytes (-20%) | 64 bytes (-20%) |
| Clock Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Supply Voltage | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.5 V to 6.25 V |
| I/O Pins | 13 | 13 | 13 | 13 | 13 | 13 |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Diferenciadores clave
- Pin-compatible with the broader PIC16LC62x family (frente a PIC16LC620A-04E/SO)
- A-silicon revision migration path with same pinout (frente a PIC16LC621-04E/SO (original silicon))
- Extended temperature grade (frente a PIC16LC621AT-04I/SO (industrial temp))
Notas de diseño
PIC16LC621T-04E/SO uses One-Time Programmable (OTP) memory - once programmed it cannot be erased or rewritten. Validate firmware in a flash-based PIC16F equivalent (e.g., PIC16F84A or PIC16F628) before committing to OTP programming. Programming a 'bad' OTP device wastes the part permanently.
The 'LC' voltage class operates from 2.5 V to 6.25 V. Ensure your regulator's brown-out threshold sits inside this window, and add a 100 nF decoupling capacitor close to VDD (pin 14) plus a 10 uF bulk capacitor on the supply rail. Power-On Reset (POR) holds the device in reset until VDD stabilizes, but rapidly-ramping supplies may need an external RC on MCLR to extend reset.
The 18-SOIC (0.300") package has 1.27 mm (50 mil) pin pitch. Keep analog and digital ground returns separated at the IC and join them at a single point near the regulator to minimize digital switching noise coupling into sensitive sensor reads. Place the crystal/oscillator traces short and symmetric, with a ground guard trace around them.
The PIC16C family has only a 2-level hardware stack - deeply nested subroutine calls will overflow it and crash the device. Restructure firmware to keep call depth <= 2 levels, or upgrade to PIC16F (8-level stack) for new designs. Enable the Watchdog Timer in software to recover from stack-overflow-induced lockups.
Información de cumplimiento
Compliance status not stated in Verified Web Data snippets; PIC16C family preceded widespread RoHS adoption, so PIC16LC621T-04E/SO may be non-RoHS depending on date code. Marked [DATA_NEEDED] in specs.
