PIC16C62B-04I/SO - 8-Bit 4MHz OTP MCU 3.5KB | Microchip | SOIC-28
MPN: PIC16C62B-04I/SO ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.12 | $7.12 |
| 10 | $6.78 | $67.80 |
| 100 | $6.21 | $621.00 |
| 500 | $5.64 | $2,820.00 |
| 1,000 | $5.02 | $5,020.00 |
PIC16C62B-04I/SO Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/EPROM/Flash), data RAM, and peripheral set (I/O, timers, serial) into one device. MCUs belong to the broader hierarchy of microcontrollers -> embedded processors -> semiconductors -> integrated circuits. PIC microcontrollers occupy the mid-range tier of Microchip's portfolio between baseline 12/16-bit instruction PIC10/12/16 cores and the high-performance PIC18/dsPIC/PIC32 lines. They are widely used in cost-sensitive embedded products where deterministic instruction execution, low power consumption, and small footprint outweigh the need for large memory or high-speed DSP.
Key features of the PIC16C62B include 22 digital I/O pins multiplexed across two ports (PORTA 5-bit, PORTB 8-bit), a 16-bit Timer1 with external crystal operation, an 8-bit Timer0 with programmable prescaler, a USART/SCI serial port, a Watchdog Timer with its own on-chip RC oscillator, and a 4-channel 8-bit Analog-to-Digital Converter (ADC). The device also supports in-circuit serial programming (ICSP) via RB6/RB7 and provides power-saving SLEEP mode plus an internal brown-out reset. The 14-bit wide instruction word allows single-word instructions for most operations, simplifying code density analysis.
Architecturally, the PIC16C62B uses a Harvard memory map with separate program and data buses, a 2-stage pipeline, and a fully static CMOS design that allows the oscillator to be stopped and restarted without losing state. The OTP EPROM program memory is windowless and one-time-programmable only - parts must be discarded after a programming error, making this family best suited to production runs rather than prototyping. The 4 MHz internal-execution rate derives from a divide-by-4 of the input oscillator, so a 4 MHz crystal yields 1 MIPS. At 5 V and 4 MHz, typical active current is around 2 mA and standby current drops below 1 uA.
Typical applications include industrial control logic, appliance control boards, sensor signal conditioning, motor control PWM loops, automotive body electronics (non-safety), security and access-control keypads, and legacy embedded products designed in the late 1990s and early 2000s. Because the PIC16C62B is OTP and mature, it is most often specified for re-orders of an existing design rather than new greenfield projects; new designs typically migrate to the flash-based PIC16F62X or PIC16F88X series for in-circuit reprogrammability.
Key design considerations include the OTP constraint (no firmware updates once sealed), the 4 MHz maximum internal rate (use -20 or -10 suffixes for higher speed), and the wide 28-SOIC footprint (pin-compatible with the flash PIC16F62X for board-level migration). When migrating code, verify that the chosen flash replacement matches the PIC16C62B's interrupt vector layout and ADC channel mapping.
This page synthesizes distributor stock, lead-time, and pricing across DigiKey, Mouser, Octopart, and LCSC, and adds drop-in alternative MPNs and design notes that go beyond the manufacturer datasheet summary.
Drop-in alternatives for PIC16C62B-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 PIC16C62B-04I/SO (same form factor and footprint) — differing in Package, Watchdog Timer, Program Memory Type, Maximum CPU Frequency, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C62B-04E/SO
✅ Drop-In✓ In Stock
$2.65 / Unit
View Datasheet →PIC16C62B-04/SO
✅ Drop-In✓ In Stock
$3.62 / Unit
View Datasheet →PIC16C62B-20I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C62BT-04I/SO
✅ Drop-In✓ In Stock
$5.1 / Unit
View Datasheet →PIC16C62AT-20I/SO
✅ Drop-In✓ In Stock
$2.65 / Unit
View Datasheet →PIC16F628A-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F648A-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C62B-04I/SO Maximum Ratings & Electrical Characteristics
| Core | PIC16 8-bit RISC |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 3.5 KB (2K x 14) |
| RAM Size | 128 B |
| EEPROM Size | None (ROM-less data EEPROM) |
| Maximum CPU Frequency | 4 MHz (4 MIPS) |
| Instruction Set Width | 14-bit |
| Number of I/O Pins | 22 |
| Number of ADC Channels | 4 x 8-bit |
| Operating Voltage Range | 2.5 V to 6.0 V |
| Operating Temperature Range | -40 C to +85 C (Industrial) |
| Package | 28-SOIC (7.50 mm body, SO) |
| Mounting Type | Surface Mount |
| Timer Modules | Timer0 (8-bit), Timer1 (16-bit) |
| Serial Interface | USART/SCI |
| Watchdog Timer | Yes (with dedicated internal RC) |
| In-Circuit Programming | ICSP via RB6/RB7 |
PIC16C62B-04I/SO Pin Configuration
| Pin 1 | /MCLR/VPP — Master clear reset input (active low) or programming voltage |
| Pin 2 | RA0/AN0 — PORTA bit 0 / analog input channel 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / analog input channel 1 |
| Pin 4 | RA2/AN2 — PORTA bit 2 / analog input channel 2 |
| Pin 5 | RA3/AN3/VREF — PORTA bit 3 / analog input channel 3 / ADC voltage reference |
| Pin 6 | RA4/T0CKI — PORTA bit 4 (open-drain) / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / analog input channel 4 / slave select |
| Pin 8 | OSC2/CLKOUT — Oscillator crystal output / Fosc/4 clock output |
| Pin 9 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Pin 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 module |
| Pin 12 | RC2/CCP1 — PORTC bit 2 / Capture-Compare-PWM module 1 |
| Pin 13 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 14 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 15 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 16 | RC6/TX/CK — PORTC bit 6 / USART transmit / USART clock |
| Pin 17 | RC7/RX/DT — PORTC bit 7 / USART receive / USART data |
| Pin 18 | VSS — Ground reference |
| Pin 19 | VDD — Positive power supply |
| Pin 20 | RB0/INT — PORTB bit 0 / external interrupt input |
| Pin 21 | RB1 — PORTB bit 1 |
| Pin 22 | RB2 — PORTB bit 2 |
| Pin 23 | RB3 — PORTB bit 3 |
| Pin 24 | RB4 — PORTB bit 4 |
| Pin 25 | RB5 — PORTB bit 5 |
| Pin 26 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 27 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 28 | VSS — Ground reference |
Typical Applications
PIC16C62B-04I/SO is suitable for 6 applications: Industrial Control Logic Board, Appliance Control Board, Automotive Body Electronics (Non-Safety), Security Keypad and Access Control, Sensor Signal Conditioning Module, Legacy Embedded Production Re-order.
Industrial Control Logic Board
The PIC16C62B-04I/SO suits industrial control logic boards thanks to its 22 digital I/O pins, 4-channel 8-bit ADC, and industrial -40 C to +85 C operating range. At 5 V and 4 MHz it consumes roughly 2 mA active, fitting conveyor controllers, pump sequencers, and machine-tool interlocks where deterministic 1 MIPS instruction execution simplifies ladder-logic-style firmware. The OTP EPROM is acceptable for high-volume production where firmware is fixed at release. Compared with switching to a flash MCU, the 4 MHz speed grade keeps EMI low and oscillator design simple in factory-floor enclosures. Use the brown-out reset and watchdog timer with internal RC for failsafe recovery in noisy industrial rails.
Recommended
Appliance Control Board
The PIC16C62B-04I/SO is widely deployed in washing-machine, dishwasher, and HVAC control boards because its 28-SOIC package handles hand-soldered rework and its 2.5-6.0 V supply range accepts the noisy rectified mains rails of white goods. The 8-bit ADC reads thermistor and pressure sensor inputs while the 16-bit Timer1 generates triac-firing pulses for heater and motor phase control. OTP memory locks the appliance firmware to a single certified revision - exactly what regulatory and warranty teams require. Compared with flash MCUs the absence of reprogramming capability prevents field tampering of safety logic. Plan a separate last-time-buy inventory if migrating to PIC16F628A-I/SO to avoid production downtime.
Recommended
Automotive Body Electronics (Non-Safety)
Although the PIC16C62B-04I/SO is not AEC-Q100 qualified, it has been used in non-safety automotive body-electronics applications such as interior lighting controllers, mirror-adjust modules, and seat-position switches that operate from a 12 V regulated bus down to 5 V. The 22 I/O drive seven-segment displays, keypad matrices, and LED bar-graph indicators. PIC microcontrollers are a long-standing choice in this segment because of their deterministic interrupt latency, which simplifies debounce logic for mechanical switch inputs. Note that for new automotive designs, AEC-Q100 qualified parts such as PIC16F1823-I/ST should be selected instead, as the OTP-based PIC16C62B is being phased out of automotive-grade portfolios.
Recommended
Security Keypad and Access Control
The PIC16C62B-04I/SO is a classic choice for security-system keypads and access-control readers because its 22 I/O can matrix-scan a 4x4 keypad and drive a 7-segment or character LCD without external logic. The 128-byte RAM holds temporary PIN buffers and the OTP EPROM prevents malicious firmware modification once deployed. The hardware USART links to a central panel over RS-485, and the 16-bit Timer1 generates precise one-second timing for lockout delays. Compared with a generic 8-bit OTP MCU from another vendor, Microchip's PIC16 mid-range core gives sub-microsecond deterministic interrupt response, which is critical for matrix-scan debounce and tamper-detection inputs. Use the watchdog timer with its dedicated internal RC to recover from brown-out attacks.
Recommended
Sensor Signal Conditioning Module
The PIC16C62B-04I/SO handles low-speed sensor signal conditioning by digitising analog inputs through its 4-channel 8-bit ADC and forwarding the result via USART to a host controller. A 4 MHz instruction rate is sufficient for 100 Hz sensor sampling and on-the-fly linearisation or thermistor-table lookup. Its industrial temperature range lets it sit next to the sensor in factory-floor enclosures. Because the PIC16C62B is OTP and cannot be firmware-updated, designers must validate the sensor calibration table thoroughly before sealing the part. For modern designs with field calibration needs, the flash-based PIC16F648A-I/SO with its 10-bit ADC and 7 KB program memory is the recommended migration path while retaining the same 28-SOIC footprint.
Recommended
Legacy Embedded Production Re-order
The most common reason to specify PIC16C62B-04I/SO in 2026 is to honour an active production re-order for a legacy embedded product whose firmware, certification, and PCB layout are locked around this exact part. Because OTP EPROM cannot be reprogrammed and a tooling-change to a flash MCU requires full re-certification, many factories deliberately hold a 12 to 24 month last-time-buy inventory of PIC16C62B-04I/SO. The 28-SOIC package is well understood by contract manufacturers, and Microchip's cross-reference tool explicitly recommends the flash PIC16F628A-I/SO for new designs but not for re-orders. Engage Microchip franchised distributors for a current lead-time quotation and consider qualified aftermarket suppliers such as Rochester Electronics and Lansdale Semiconductor for additional buffer stock.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C62B-04I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C62B-04E/SO | PIC16C62B-04/SO | PIC16C62B-20I/SO | PIC16C62BT-04I/SO | PIC16F628A-I/SO | PIC16F648A-I/SO |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (7.50 mm) | 28-SOIC (7.50 mm) - same | 28-SOIC (7.50 mm) - same | 28-SOIC (7.50 mm) - same | 28-SOIC (7.50 mm) - same | 28-SOIC (7.50 mm) - same | 28-SOIC (7.50 mm) - same |
| Program Memory Type | OTP EPROM 3.5 KB | OTP EPROM 3.5 KB - same | OTP EPROM 3.5 KB - same | OTP EPROM 3.5 KB - same | OTP EPROM 3.5 KB - same | Flash 3.5 KB | Flash 7 KB |
| RAM Size | 128 B | 128 B | 128 B | 128 B | 128 B | 224 B | 256 B |
| Max CPU Frequency | 4 MHz (1 MIPS) | 4 MHz (1 MIPS) | 4 MHz (1 MIPS) | 20 MHz (5 MIPS) | 4 MHz (1 MIPS) | 20 MHz (5 MIPS) | 20 MHz (5 MIPS) |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +125 C (Extended) | 0 C to +70 C (Commercial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) |
| ADC Resolution | 8-bit, 4 channels | 8-bit, 4 channels | 8-bit, 4 channels | 8-bit, 4 channels | 8-bit, 4 channels | No ADC (comparators only) | 10-bit, 8 channels |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | Active | Active |
Key Differentiators
- Industrial temperature grade in same 28-SOIC package as extended and commercial variants (vs PIC16C62B-04E/SO)
- Pin-compatible with flash-based PIC16F628A-I/SO for future migration (vs PIC16F628A-I/SO)
- 4 MHz speed grade covers most low-speed control; -20 speed grade gives headroom (vs PIC16C62B-20I/SO)
Design Notes
PIC16C62B is OTP EPROM, not Flash - once programmed, the firmware cannot be erased or rewritten. Production code must be fully validated on a windowed ceramic sample (PIC16C62B-XX/JW) before committing to volume programming. OTP programming errors result in scrap, so budget 5-10% programming yield loss. Unlike flash MCUs, field firmware updates are impossible - if remote upgrade is needed, migrate to PIC16F628A-I/SO or PIC16F648A-I/SO on the same 28-SOIC footprint.
At 5 V and 4 MHz the PIC16C62B-04I/SO draws roughly 2 mA active and less than 1 uA in SLEEP mode per the manufacturer datasheet. The /MCLR pin must be held high through a 10 kohm pull-up to VDD; a direct connection to VDD is acceptable but adding the pull-up improves ESD and brown-out immunity. Decouple VDD with a 100 nF ceramic capacitor placed within 5 mm of the pin and a bulk 10 uF tantalum or aluminium on the same rail as the IC.
The 28-SOIC package has a 7.50 mm body width (wide-body), which is the same land pattern as the flash-based PIC16F62X and PIC16F648A-I/SO - this enables layout-reuse migration. Place the 4 MHz crystal or resonator within 5 mm of OSC1/OSC2 (pins 9 and 10) with short traces to minimise stray capacitance. Keep the ICSP lines RB6/PGC (pin 26) and RB7/PGD (pin 27) accessible on the board so production programming does not require pin-clip adapters.
The PIC16C62B-04I/SO in industrial -40 C to +85 C grade is rated for typical embedded environments without special heatsinking. Estimated: at 5 V and 4 MHz active, internal dissipation is below 20 mW, well within the SOIC-28 theta_JA of approximately 85 C/W. Industrial designs using the full temperature range should still verify self-heating in enclosed housings - the SOIC-28 plastic package is rated for a maximum junction temperature of 150 C and derate linearly above 25 C ambient.
Compliance Information
RoHS, REACH, lead-free and halogen-free status not explicitly stated in the verified distributor data. Microchip Technology publishes compliance information on the product page; this should be cross-checked before use in RoHS-restricted markets. Not AEC-Q100 qualified - choose PIC16F1823-I/ST for new automotive designs. Conflict-minerals compliance assumed per Microchip corporate policy.
