PIC16LC620AT-04I/SO - 8-Bit 4MHz OTP MCU, 896B | Microchip
MPN: PIC16LC620AT-04I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.62 | $26.20 |
| 100 | $2.18 | $218.00 |
| 500 | $1.85 | $925.00 |
| 1,000 | $1.62 | $1,620.00 |
PIC16LC620AT-04I/SO Overview
A PIC microcontroller (MCU) is a compact programmable processor built around a Harvard-architecture RISC core with separate program and data buses. Within the broader taxonomy, this part sits in the PIC16C mid-range family, between the 8-bit PIC10/12/16 baseline parts and the higher-end 16-bit dsPIC/PIC24 families. PIC MCUs integrate CPU core, non-volatile program memory (here OTP), volatile RAM, EEPROM data memory on some variants, timers, an ADC, comparators, and digital I/O into a single chip, eliminating external memory and most glue logic in small embedded designs.
Key features include a 14-bit instruction word with 8-bit data path, two-level deep hardware stack, seven special-function hardware registers, direct/indirect/relative addressing modes, and on-chip peripherals suitable for simple control loops, sensor interfacing, and human-machine interface tasks. The PIC16C620A core provides deterministic instruction timing - every instruction executes in one oscillator cycle after the fetch - which simplifies real-time scheduling. The integrated brown-out reset, watchdog timer, and power-on reset reduce external component count in cost-sensitive designs.
The architecture uses a RISC core with 35 single-word instructions, allowing most operations to complete in a single instruction cycle at 4 MHz (250 ns cycle time). The internal oscillator option and wide voltage range support battery-powered and automotive environments, while the OTP program memory enables low-cost prototyping before committing to a masked-ROM version for high-volume production. Compared with Flash-based PIC16F equivalents, OTP parts offer lower per-unit cost in mature, code-stable products.
Typical applications include automotive body controllers, sensor signal conditioning, simple PWM-driven LED or motor control loops, IR remote control transmitters and receivers, and consumer appliance user-interface boards. The 18-pin SOIC footprint is convenient for hand-soldered prototypes and short-run production.
When designing with this device, ensure your code-development toolchain supports OTP programming (MPLAB X with a compatible programmer such as PICkit) and that you verify OTP one-time-programming limits during validation. For new designs, weigh the OTP cost advantage against the field-upgrade convenience of Flash-based PIC16F parts.
This page synthesizes distributor pricing, pin-compatible drop-in alternatives from Microchip's PIC16 family, lifecycle status, and practical design notes not found in the bare manufacturer datasheet.
Drop-in alternatives for PIC16LC620AT-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 PIC16LC620AT-04I/SO (same form factor and footprint) — differing in Program Memory Size, Operating Temperature Range, Package, RAM Size, Program Memory Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LC620A-04I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LC620A-04/SO
✅ Drop-In✓ In Stock
$2.15 / Unit
View Datasheet →PIC16LC620-04I/P
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.78 / Unit
View Datasheet →PIC16F628A-I/SO
✅ Drop-In✓ In Stock
$2.32 / Unit
View Datasheet →PIC16LC620AT-04E/SO
✅ Drop-In✓ In Stock
$2.25 / Unit
View Datasheet →PIC16LC620A-04I/SS
✅ Drop-In✓ In Stock
$1.55 / Unit
View Datasheet →PIC16LC620AT-04I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC |
| Series | PIC® 16C |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 896 B (512 x 14 words) |
| RAM Size | 96 x 8 bytes |
| Maximum CPU Speed | 4 MHz |
| Instruction Word Width | 14-bit |
| Supply Voltage Range | 2.5 V to 6.25 V |
| I/O Pins | 13 |
| Package | 18-SOIC (0.300 inch, SO-18) |
| Operating Temperature Range | -40 °C to +85 °C (Industrial) |
| Mounting Type | Surface Mount |
| Stack Depth | 2 levels (hardware) |
| Number of Instructions | 35 |
| Addressing Modes | Direct, Indirect, Relative |
| Packaging | Tape & Reel (T suffix) |
PIC16LC620AT-04I/SO Pin Configuration
| Pin 1 | RA2 — Port A bit 2 / analog input / comparator output |
| Pin 2 | RA3 — Port A bit 3 / analog input / comparator input |
| Pin 3 | RA4 — Port A bit 4 / T0CKI (Timer0 clock input) |
| Pin 4 | MCLR/VPP — Master clear reset / programming voltage input |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — Port B bit 0 / external interrupt |
| Pin 7 | RB1 — Port B bit 1 |
| Pin 8 | RB2 — Port B bit 2 |
| Pin 9 | RB3 — Port B bit 3 |
| Pin 10 | RB4 — Port B bit 4 |
| Pin 11 | RB5 — Port B bit 5 |
| Pin 12 | RB6 — Port B bit 6 |
| Pin 13 | RB7 — Port B bit 7 |
| Pin 14 | VDD — Positive supply voltage (2.5 V to 6.25 V) |
| Pin 15 | OSC2/CLKOUT — Oscillator output / clock out |
| Pin 16 | OSC1/CLKIN — Oscillator input / external clock in |
| Pin 17 | RA0 — Port A bit 0 / analog input |
| Pin 18 | RA1 — Port A bit 1 / analog input |
Typical Applications
PIC16LC620AT-04I/SO is suitable for 6 applications: Automotive Body Controllers, Sensor Signal Conditioning, LED and Lighting Control, IR Remote Control Transmitter, Consumer Appliance User Interface, Industrial Sensor Node / Simple PLC.
Automotive Body Controllers
The PIC16LC620AT-04I/SO fits automotive body-control applications such as interior lighting, mirror control, and simple wiper logic thanks to its 13 GPIO, 2.5-6.25 V supply tolerance covering 5 V automotive rails, and industrial -40 °C to +85 °C temperature range. The on-chip comparator and watchdog timer provide sensor monitoring and lockup recovery without external components. Note that this part is industrial-grade, not AEC-Q100 qualified - for AEC-Q100 requirements, choose the PIC16F628A-I/SO automotive variant instead. The 896 B OTP memory suits fixed-function body controllers with stable firmware.
Recommended
Sensor Signal Conditioning
The PIC16LC620AT-04I/SO handles simple sensor-conditioning tasks such as thermistor-to-PWM conversion, light-sensor threshold switching, and contact-debounce logic. Its on-chip analog comparator combined with 13 digital I/O lets designers read a single analog sensor and drive a digital output without an external op-amp. The 4 MHz core executes deterministic single-cycle instructions (250 ns cycle) suitable for debounce timing and PWM generation, while the wide 2.5-6.25 V supply lets it run directly from unregulated battery or USB power.
Recommended
LED and Lighting Control
The PIC16LC620AT-04I/SO is well-suited to small LED driver boards for indicator lamps, decorative strips, and signage where 8-bit processing is sufficient and code is finalized. Its Timer0 module supports PWM generation for LED dimming, and the 13 GPIO lines can drive multiple LED channels or Charlieplexed matrices directly. The wide VDD range (2.5-6.25 V) supports both 3.3 V and 5 V LED strings, while the 18-SOIC footprint keeps the BOM compact for low-cost lighting PCAs. Designers targeting high-volume consumer lighting prefer OTP over Flash for unit-cost reasons.
Recommended
IR Remote Control Transmitter
The PIC16LC620AT-04I/SO is a classic fit for IR remote-control transmitter MCUs in consumer audio/video equipment. Its 8-bit core, 4 MHz clock, and 35-instruction set are sufficient to encode RC-5, NEC, or SIRC protocols in software, while the 13 GPIO can scan 4x4 keypad matrices plus drive the IR LED through a transistor. The OTP memory and low per-unit cost are ideal for high-volume remote production where firmware is finalized and unit cost dominates BOM decisions. The industrial temp range handles in-car or kitchen-environment remotes.
Recommended
Consumer Appliance User Interface
The PIC16LC620AT-04I/SO fits low-end appliance user-interface boards in coffee makers, microwave ovens, washing machines, and small kitchen gadgets where cost is paramount. Its 13 GPIO can scan a 3x4 keypad plus drive 7-segment displays or LCD segments directly via software multiplexing. The integrated watchdog timer recovers from ESD-induced firmware lockups, and the 2.5-6.25 V supply covers both battery and rectified-mains-derived rails. OTP programming suits the appliance market, where the same firmware ships for years and per-unit cost dominates.
Recommended
Industrial Sensor Node / Simple PLC
The PIC16LC620AT-04I/SO operates as a compact sensor-node or small PLC module in industrial control systems, reading a few digital inputs and driving relay or SSR outputs based on programmed logic. Its industrial -40 °C to +85 °C range handles factory-floor environments, and its wide VDD range accepts 24 V-derived supplies after a simple linear regulator. The deterministic single-cycle instruction execution makes timing straightforward for deterministic ladder-logic-style applications. For Ethernet or fieldbus connectivity, pair it with a serial bridge MCU rather than expecting the 16C620A to host the protocol stack itself.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC620AT-04I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LC620A-04I/SO | PIC16LC620A-04/SO | PIC16LC620-04I/P | PIC16F628A-I/SO | PIC16LC620AT-04E/SO | PIC16LC620A-04I/SS |
|---|---|---|---|---|---|---|---|
| Package | 18-SOIC | 18-SOIC (same) | 18-SOIC (same) | PDIP-18 (through-hole) | 18-SOIC (same) | 18-SOIC (same) | SSOP-20 (same family, different body) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 896 B OTP | 896 B OTP | 896 B OTP | 896 B OTP | 2 KB Flash | 896 B OTP | 896 B OTP |
| Max CPU Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 20 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 | 2.0 V to 5.5 V | 2.5 V to 6.25 V | 2.5 V to 6.25 V |
| I/O Pins | 13 | 13 | 13 | 13 | 16 | 13 | 13 |
| Temperature Range | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C | 0 °C to +70 °C (Commercial) | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +125 °C (Extended) | -40 °C to +85 °C |
| RAM Size | 96 B | 96 B | 96 B | 96 B | 224 B | 96 B | 96 B |
Key Differentiators
- Tape-and-reel packaging option in active production (vs PIC16LC620A-04I/SO)
- Industrial temperature range for harsh environments (vs PIC16LC620A-04/SO)
- Migration path to Flash for design evolution (vs PIC16F628A-I/SO)
Design Notes
Decouple VDD (pin 14) with a 100 nF ceramic capacitor placed within 5 mm of the pin, plus a 10 µF bulk capacitor on the supply rail. According to Microchip PIC16C62X layout guidance, the bulk cap absorbs digital switching transients. For battery-powered designs, place the MCU in SLEEP mode during idle periods - the 16C620A's SLEEP current is in the microamp range, dramatically extending battery life versus active mode.
Keep the OSC1/OSC2 oscillator traces short and surrounded by a ground guard ring. According to Microchip application note AN588, crystal oscillator traces longer than 5 mm can pick up noise and cause erratic clocking or high EMI. For high-noise environments, use a 4-pin crystal rather than a 2-pin one, and connect the case ground to the digital ground plane through a short trace to minimize radiated emissions.
Estimated: MCLR/VPP (pin 4) must be tied to VDD through a 10 kΩ pull-up resistor for normal operation; programming mode requires raising this pin to ~13 V. Many first-time users forget the pull-up and the part appears dead at power-on. Additionally, OTP parts can be programmed only once - verify code in a Flash-based PIC16F equivalent (such as PIC16F628A-I/SO) before committing to OTP programming of production units.
The 18-SOIC package has a junction-to-ambient thermal resistance (θJA) of approximately 80 °C/W in still air, but at the low clock speeds and supply voltages typical of this part, self-heating is negligible (well under 100 mW). Estimated: continuous active-mode dissipation at 6.25 V and 4 MHz is approximately 5-10 mW, so thermal management is rarely a concern. Focus on supply-rail decoupling and I/O pin current limits (25 mA per pin, 100 mA per port) instead.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - choose PIC16F628A-I/SO automotive variant for AEC-Q100. Halogen-free status not explicitly stated in available data.
