PIC16LC621-04I/SS - 4MHz 8-bit OTP MCU, 1.75KB | Microchip
N.º da peça: PIC16LC621-04I/SS ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $2.1 | $2,10 |
| 10 | $1.95 | $19,50 |
| 100 | $1.72 | $172,00 |
| 500 | $1.45 | $725,00 |
| 1.000 | $1.22 | $1.220,00 |
PIC16LC621-04I/SS Visão geral
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/EPROM/Flash), data RAM, and peripheral I/O on one die. The PIC16C62X family belongs to Microchip's mid-range architecture, which uses a 14-bit wide instruction word with an 8-bit data path. Within the broader taxonomy, this places the part as: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC. The LC62X line targets cost-sensitive embedded control applications requiring a small footprint and very low active/standby power.
Key features include 35 single-cycle instructions (all 200 ns except program branches which take two cycles), a two-level deep hardware stack, seven or eight special function hardware registers, and direct/indirect/relative addressing modes. Supply voltage spans 2.5 V to 6.25 V, allowing operation from a single Li-ion cell or a regulated 5 V rail. The 13 I/O pins can each source or sink up to 25 mA, and four of them support wake-up-on-change interrupts. The device also includes a watchdog timer with on-chip RC oscillator, a power-on reset (POR), and a low-power SLEEP mode with multiple wake-up sources.
The PIC16LC621 uses a Harvard RISC architecture with separate program and data buses, enabling single-cycle instruction fetch plus execution. An integrated 4 MHz internal oscillator option (selected via configuration bits) eliminates the need for an external crystal in cost-sensitive designs. The OTP program memory supports one-time programming using a standard PIC programmer, which suits low-to-medium volume production runs where mask-ROM NRE is not justified.
Typical applications include small appliance controls (coffee makers, blenders, fans), battery chargers, remote-control transmitters, sensor signal conditioning front-ends, LED lighting controllers, and consumer white-goods user-interface boards. The industrial temperature range also opens automotive interior lighting, HVAC damper controls, and 2-way radio accessory ports.
Design considerations: always use a 0.1 uF decoupling capacitor within 5 mm of VDD, and place MCLR pull-up (typically 10 kohm) close to the pin to prevent spurious resets. For OTP programming, ensure the ICSP clock/data/Vpp lines are accessible via a header or test points, and verify the configuration bits (oscillator selection, watchdog, code protect, brown-out) before programming.
This page synthesizes distributor pricing, drop-in alternative PIC16C62X family variants, and practical design notes not found in the manufacturer datasheet alone.
Alternativas drop-in para PIC16LC621-04I/SS — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com PIC16LC621-04I/SS (mesmo formato e footprint) — diferindo em Package, Operating Temperature Range, Program Memory Size, Program Memory Type, I/O Pins.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
PIC16LC621A-04I/SS
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
PIC16LC620A-04I/SS
✅ Drop-In✓ Em estoque
$1.55 / unidade
Ver ficha técnica →PIC16LC620-04I/SS
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$1.25 / unidade
Ver ficha técnica →PIC16LC620A-04E/SS
✅ Drop-In✓ Em estoque
$2.54 / unidade
Ver ficha técnica →PIC16LC620AT-04I/SO
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$1.62 / unidade
Ver ficha técnica →PIC16LC620A-04I/SS
✅ Drop-In✓ Em estoque
$1.55 / unidade
Ver ficha técnica →PIC16LC621-04I/SS Classificações máximas e características elétricas
| Family | PIC16C62X (mid-range 8-bit MCU) |
| Program Memory | 1.75 KB (1K x 14) OTP/EPROM |
| Data RAM | 80 bytes |
| Data EEPROM | Not present |
| Frequência máxima de clock | 4 MHz |
| Instruction Cycle | 200 ns (single-cycle) |
| Supply Voltage (VDD) | 2.5 V to 6.25 V |
| I/O Pins | 13 |
| Timers | 1 x 8-bit, 1 x 16-bit (with PWM) |
| ADC | Not present |
| Comparators | Not present |
| Encapsulamento | 20-pin SSOP (SS) |
| Temperatura de operação | -40 C to +85 C (industrial, "I" suffix) |
| Tipo de montagem | Surface Mount |
| Instruction Set | 35 instructions, 14-bit wide |
| Stack Depth | 2 levels (hardware) |
| Watchdog Timer | Yes (with on-chip RC oscillator) |
| Power-on Reset | Yes |
| Status RoHS | Compliant |
Configuração de pinos do PIC16LC621-04I/SS
| Pino 1 | RA2 — Bidirectional I/O port A bit 2 |
| Pino 2 | RA3 — Bidirectional I/O port A bit 3 |
| Pino 3 | RA4/T0CKI — Port A bit 4 / Timer 0 clock input |
| Pino 4 | MCLR/Vpp — Master Clear reset (active low) / Programming voltage input |
| Pino 5 | VSS — Ground reference |
| Pino 6 | RB0/INT — Port B bit 0 / External interrupt input |
| Pino 7 | RB1 — Port B bit 1 |
| Pino 8 | RB2 — Port B bit 2 |
| Pino 9 | RB3 — Port B bit 3 |
| Pino 10 | RB4 — Port B bit 4 (interrupt-on-change) |
| Pino 11 | RB5 — Port B bit 5 (interrupt-on-change) |
| Pino 12 | RB6/PGC — Port B bit 6 / ICSP clock input |
| Pino 13 | RB7/PGD — Port B bit 7 / ICSP data input/output |
| Pino 14 | VDD — Positive supply voltage |
| Pino 15 | OSC2/CLKOUT — Oscillator crystal output / Clock output |
| Pino 16 | OSC1/CLKIN — Oscillator crystal input / External clock input |
| Pino 17 | RA0 — Port A bit 0 |
| Pino 18 | RA1 — Port A bit 1 |
| Pino 19 | VDD — Positive supply voltage (secondary) |
| Pino 20 | VSS — Ground reference (secondary) |
Aplicações típicas
PIC16LC621-04I/SS é adequado para 8 aplicaçãos: Small Appliance Motor Control, Battery-Powered Remote Control Transmitter, LED Lighting Controller, Automotive Interior Accessory, Consumer White Goods User Interface, Sensor Signal Conditioning Front-End, Battery Charger Control Board, HVAC Damper and Valve Actuator.
Small Appliance Motor Control
The PIC16LC621-04I/SS's 4 MHz clock, 1.75 KB OTP, and 13 I/O pins fit low-cost BLDC or universal-motor control boards in coffee makers, blenders, and stand fans. The 200 ns instruction cycle is fast enough for 60 Hz zero-cross detection and triac phase-angle firing; the hardware PWM module on the CCP pin drives TRIAC gates directly. Industrial -40C to +85C rating survives kitchen thermal cycling, and the SSOP-20 footprint fits cramped control boards alongside a 25 mA-rated I/O directly sinking LED indicators without buffer transistors.
Recomendado
Battery-Powered Remote Control Transmitter
The PIC16LC621-04I/SS is well suited to handheld IR/RF remote controls because its 2.5 V to 6.25 V supply range accepts two alkaline or a single Li-ion cell, and SLEEP current is only a few microamps. The interrupt-on-change feature on RB4-RB7 wakes the MCU from SLEEP on a key press within microseconds, achieving multi-year battery life. The 200 ns instruction cycle easily generates 38 kHz IR carrier for NEC or RC5 protocols, and the 1.75 KB OTP stores lookup tables for dozens of device codes.
Recomendado
LED Lighting Controller
Lighting controllers benefit from the PIC16LC621-04I/SS's PWM module and 25 mA I/O drive. The 8-bit PWM running from the 4 MHz internal oscillator delivers 256-step dimming resolution at 4 kHz update rate, flicker-free for human perception. The 13 I/O pins drive multiple LED channels directly without MOSFET buffers up to 25 mA per pin. Industrial -40C to +85C operation covers outdoor fixture temperatures behind the heatsink, and the SSOP-20 package is small enough for GU10 spotlight form factors.
Recomendado
Automotive Interior Accessory
The PIC16LC621-04I/SS is suited to non-safety automotive interior accessories such as ambient lighting, seat heaters, and mirror controllers, where industrial temperature range is sufficient. The 13 I/O pins directly drive relay coils and LED indicator rings at 25 mA per pin, while the PWM module handles soft-start dimming for ambient lighting transitions. The 2.5 V to 6.25 V supply tolerates load-dump transients when paired with a TVS diode and bulk capacitor. Designers must add external ESD protection on connector pins since the bare MCU is not AEC-Q100 qualified.
Recomendado
Consumer White Goods User Interface
Washing machines, dishwashers, and microwave ovens use PIC16LC621-04I/SS for button-matrix scanning, rotary-encoder reading, and 7-segment or LCD segment display driving. The 13 I/O pins handle a 4x4 keypad with interrupt-on-change wake-up plus seven display segments, eliminating external I/O expanders. Industrial temperature rating survives the 70C ambient inside a sealed appliance, and the OTP memory stores appliance firmware that is committed at production with no field updates required, reducing BOM cost.
Recomendado
Sensor Signal Conditioning Front-End
Digital-only sensor interface boards use PIC16LC621-04I/SS as a low-cost co-processor that reads digital humidity, temperature, or flow sensors and forwards formatted data over UART or SPI to a host. The 4 MHz clock supports UART communication up to 38.4 kbaud, and the 1.75 KB OTP holds sensor calibration lookup tables. With no internal ADC, the design must use a digital-output sensor like the SHT21 or use the PIC16LC621A variant instead. Low SLEEP current is ideal for battery-powered IoT sensor nodes.
Recomendado
Battery Charger Control Board
The PIC16LC621-04I/SS is appropriate for low-to-medium power NiMH or Li-ion charger control where its PWM module regulates charge current and its 13 I/O pins monitor voltage, current, and temperature. The 200 ns instruction cycle handles closed-loop charge regulation with sufficient bandwidth, and the 2.5 V to 6.25 V supply directly accepts single-cell Li-ion packs. Industrial temperature range supports the 60C typical operating point inside a charger enclosure, and the SSOP package keeps the charger PCB small.
Recomendado
HVAC Damper and Valve Actuator
Building automation damper and valve actuators use PIC16LC621-04I/SS to drive small gear motors and read position feedback. The PWM module soft-starts damper motors to prevent water-hammer effects, while the 13 I/O pins read limit switches and position potentiometers via the comparator-less design. Industrial -40C to +85C operation covers unconditioned mechanical-room environments, and the 2.5 V to 6.25 V supply accepts 24 VAC rectified and regulated building-automation rails. OTP firmware prevents field code modification.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para PIC16LC621-04I/SS — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | PIC16LC621A-04I/SS | PIC16LC620A-04I/SS | PIC16LC620-04I/SS | PIC16LC620A-04E/SS | PIC16LC620AT-04I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-SSOP | 20-SSOP | 20-SSOP | 20-SSOP | 20-SSOP | 20-SOIC |
| Program Memory | 1.75 KB OTP | 1.75 KB OTP | 0.875 KB OTP | 0.875 KB OTP | 0.875 KB OTP | 0.875 KB OTP |
| Data RAM | 80 bytes | 80 bytes | 80 bytes | 80 bytes | 80 bytes | 80 bytes |
| ADC | Not present | 8-bit, 5 channels | 8-bit, 5 channels | Not present | 8-bit, 5 channels | 8-bit, 5 channels |
| Maximum Clock | 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 |
| Operating Temperature | -40 C to +85 C (industrial) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C (extended) | -40 C to +85 C |
| I/O Pins | 13 | 13 | 13 | 13 | 13 | 13 |
| Unit Price (1 pc, USD) | 2.10 | 2.25 | 2.05 | 1.95 | 2.40 | 2.00 |
Principais diferenciais
- Lowest-cost 1.75 KB OTP MCU in 20-SSOP without ADC overhead (vs PIC16LC621A-04I/SS)
- Larger 1.75 KB program memory versus smaller siblings (vs PIC16LC620-04I/SS / PIC16LC620A-04I/SS)
- Industrial -40C to +85C temperature range at lower price than extended grade (vs PIC16LC620A-04E/SS)
- Native 20-SSOP package offers smaller footprint than SOIC-20 (vs PIC16LC620AT-04I/SO)
Notas de projeto
Place a 0.1 uF ceramic decoupling capacitor within 5 mm of VDD (pin 14 and pin 19, both connected) and a 10 uF bulk electrolytic or tantalum on the VDD rail. For battery-powered designs, add a 100 ohm resistor in series with VDD to limit inrush current during SLEEP-to-active wake transitions. The PIC16LC621-04I/SS draws only a few microamps in SLEEP mode but can spike to several milliamps during active clock edges, so local decoupling is essential.
Route the MCLR pin (pin 4) with a short trace to a 10 kohm pull-up to VDD. If ICSP programming is required, expose the PGC (RB6), PGD (RB7), MCLR/Vpp, VDD, and VSS pins on a 0.1 inch header or test pad array. Keep the OSC1/OSC2 traces short and symmetric to minimize stray capacitance; for crystal operation use 15-33 pF load capacitors matched within 10% of the crystal's specified load capacitance.
Do not assume unused I/O pins default to inputs - they can float and draw parasitic current. Configure all unused pins as outputs driving low, or as inputs with internal weak pull-ups enabled. Configuration bits must be set correctly before programming: oscillator selection (RC vs XT vs LP), watchdog timer enable, code-protect, and brown-out reset (where present). A misconfigured watchdog can lock the MCU into infinite reset loops if firmware does not periodically CLRWDT.
Estimated: At maximum ambient +85 C and typical 4 MHz active current around 2 mA at 5 V, the PIC16LC621-04I/SS dissipates roughly 10 mW, well within the SSOP-20 package rating of ~500 mW at 25 C (derating linearly to ~150 mW at 85 C). No heatsink is required for any application. However, in sealed enclosures above 60 C ambient, verify the junction temperature rise against Microchip's SSOP-20 thermal resistance (theta_JA approximately 90 C/W).
Informações de conformidade
RoHS compliant and lead-free per Microchip product page. Industrial temperature grade only; not AEC-Q100 qualified - choose PIC16LC620A-04E/SS for extended automotive temperature ranges.
