PIC16C662-20E/P - 8-bit OTP MCU, 20 MHz, 33 I/O | Microchip
MPN: PIC16C662-20E/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.95 | $8.95 |
| 10 | $8.05 | $80.50 |
| 100 | $7.2 | $720.00 |
| 500 | $6.45 | $3,225.00 |
| 1,000 | $5.85 | $5,850.00 |
PIC16C662-20E/P Overview
An 8-bit OTP microcontroller is a member of the microcontrollers (MCU) family — a single-chip computer integrating a CPU core, non-volatile program memory (here, one-time programmable EPROM), working RAM, and programmable peripheral I/O on one die. Within the broader taxonomy, the PIC16C662 belongs to: 8-bit MCU -> RISC microcontroller -> CMOS microcontroller -> embedded controller -> semiconductor IC. OTP memory allows a single factory- or customer-programmable code image that cannot be electrically rewritten, which is typically used for low- to medium-volume production where firmware stability has been finalized.
Key features include the original PIC16Cxx Harvard RISC architecture with only 35 single-word instructions to learn, 14-bit instruction word, an 8-level deep hardware stack, an integrated analog comparator module, and interrupt-driven I/O with edge-selectable interrupts on PORTB. The device supports a watchdog timer with on-chip RC oscillator, power-saving Sleep mode, and a programmable code-protection bit.
Technical depth comes from its CMOS OTP process combined with the Harvard bus that lets instruction and data fetches occur simultaneously, achieving most instructions in a single 200 ns cycle and program branches in two cycles (400 ns). Compared with contemporary EPROM-based MCUs of the same era, the 14-bit wide instruction word provides more opcode room than 8-bit CISC cores and improves code density for arithmetic and bit-manipulation workloads.
Typical applications include automotive body and chassis subsystems, white-goods appliance control, industrial sensor interfaces, and low-cost user-interface panels that benefit from a 33-I/O budget and a wide automotive operating temperature range. The DIP-40 footprint is favored for prototype breadboarding and rework-friendly production runs.
When designing with this OTP MCU, plan your code carefully because OTP cannot be rewritten after programming; only one code-programming pass is possible. Verify that the application's peripheral set (analog comparator + PORTB interrupts + timer/counter) is sufficient, because the PIC16C662 does not include the ADC, PWM, or USART peripherals found on later PIC16F-series parts.
This page synthesizes distributor pricing and stock data, drop-in same-brand alternatives, and engineering design notes that complement the Microchip datasheet and the PICmicro Pin and Code Compatibility charts.
Drop-in alternatives for PIC16C662-20E/P — 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 PIC16C662-20E/P (same form factor and footprint) — differing in Mounting Type, Package, Program Memory Type, Program Memory Size, Instruction Set.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C662-20E/L
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$10.75 / Unit
View Datasheet →PIC16C662-10E/L
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$9.85 / Unit
View Datasheet →PIC16C662-20/PQ
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$9.75 / Unit
View Datasheet →PIC16C66-20/SP
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.61 / Unit
View Datasheet →PIC16C662-20E/P Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC RISC (Harvard) |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 7 KB |
| RAM Size | 176 bytes |
| Instruction Set | 35 single-word instructions (14-bit wide) |
| Maximum Clock Frequency | 20 MHz |
| Instruction Cycle Time | 200 ns (1 cycle); 400 ns for branches |
| Supply Voltage (VDD) | 4.5 V to 5.5 V |
| Number of I/O Pins | 33 |
| I/O Ports | PORTA / PORTB / PORTC / PORTD / PORTE |
| Analog Comparator | Yes (on-chip) |
| Watchdog Timer | Yes (with on-chip RC oscillator) |
| Package | 40-pin PDIP (DIP-40), Through-Hole |
| Pin Count | 40 |
| Operating Temperature Grade | Automotive (Extended) |
| Mounting Type | Through-Hole (THT) |
PIC16C662-20E/P Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (Reset) input / Programming voltage |
| Pin 2 | RA0/AN0 — PORTA bit 0 / analog input |
| Pin 3 | RA1/AN1 — PORTA bit 1 / analog input |
| Pin 4 | RA2/AN2 — PORTA bit 2 / analog input |
| Pin 5 | RA3/AN3 — PORTA bit 3 / analog input |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / analog input / slave select |
| Pin 8 | RE0/RD — PORTE bit 0 / Parallel Slave Port read control |
| Pin 9 | RE1/WR — PORTE bit 1 / Parallel Slave Port write control |
| Pin 10 | RE2/CS — PORTE bit 2 / Parallel Slave Port chip select |
| Pin 11 | VDD — Positive supply voltage (4.5 V to 5.5 V) |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Pin 14 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| Pin 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock |
| Pin 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| Pin 17 | RC2/CCP1 — PORTC bit 2 / Capture-Compare-PWM 1 |
| Pin 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 19 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| Pin 20 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| Pin 21 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| Pin 22 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| Pin 23 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 25 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| Pin 26 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| Pin 27 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| Pin 28 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| Pin 29 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 |
| Pin 30 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 |
| Pin 31 | VSS — Ground reference |
| Pin 32 | VDD — Positive supply voltage (4.5 V to 5.5 V) |
| Pin 33 | RB0/INT — PORTB bit 0 / external interrupt |
| Pin 34 | RB1 — PORTB bit 1 |
| Pin 35 | RB2 — PORTB bit 2 |
| Pin 36 | RB3 — PORTB bit 3 |
| Pin 37 | RB4 — PORTB bit 4 |
| Pin 38 | RB5 — PORTB bit 5 |
| Pin 39 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 40 | RB7/PGD — PORTB bit 7 / ICSP data |
Typical Applications
PIC16C662-20E/P is suitable for 7 applications: Automotive Body Electronics, White-Goods Appliance Control, Industrial Sensor Interfaces, User-Interface Panels with Keypads and Displays, Security and Access-Control Panels, HVAC and Climate-Control Modules, Educational and Hobbyist Projects.
Automotive Body Electronics
The PIC16C662-20E/P's automotive Extended temperature grade (-40 °C to +125 °C), 33 I/O pins, and robust 5 V operation make it a strong fit for automotive body and chassis subsystems such as door modules, seat controllers, mirror actuators and lighting drivers. Its 20 MHz / 200 ns instruction cycle supports real-time multiplexing of multiple relay and LED loads without missing encoder pulses or switch-debounce windows. The on-chip analog comparator enables direct sensing of current-shunt or thermistor signals without an external op-amp, reducing BOM cost. Compared with newer PIC16F-series parts, the OTP memory is acceptable because automotive firmware rarely changes once the platform is locked, and the 7 KB code space covers typical body-controller logic. Watchdog timer and PORTB interrupt-on-change provide the fail-safe and wake-up behavior needed for Class-A body modules.
Recommended
White-Goods Appliance Control
Washing machines, dishwashers, microwave ovens and refrigerators use 8-bit MCUs like the PIC16C662-20E/P to drive segment displays, read keypads, and switch triac-driven motors and heaters. The 33 I/O easily covers 7-segment displays plus multiple keypad rows, while the integrated analog comparator simplifies zero-crossing detection of the AC line for quiet triac switching. The 7 KB OTP memory locks in the appliance firmware at production, preventing field tampering and ensuring regulatory compliance. Its extended temperature grade survives the high-heat environment of an oven or dishwasher, and the DIP-40 footprint eases factory programming and rework. Compared with RISC competitors of the era, the 35-instruction PIC16C6x set shortens the assembly-code learning curve for appliance firmware teams.
Recommended
Industrial Sensor Interfaces
Industrial sensor-interface boards often need a microcontroller that can read multiple digital sensors, perform local filtering, and report results over an isolated bus, and the PIC16C662-20E/P fills that role effectively. The 20 MHz clock and 200 ns cycle time let the MCU service 33 discrete inputs within sub-millisecond scan intervals required by Class-A industrial control loops. PORTB's interrupt-on-change feature wakes the device from Sleep on a sensor edge, lowering quiescent current for battery-backed instrumentation. The on-chip analog comparator supports threshold detection on analog sensor channels without an external op-amp, and the watchdog timer plus code protection harden the device against firmware corruption in fielded installations. The DIP-40 package is favored for prototype and small-batch industrial panel builders.
Recommended
User-Interface Panels with Keypads and Displays
User-interface panels that combine a 4x4 keypad, 7-segment or character LCD, indicator LEDs, and a buzzer are a classic application for the PIC16C662-20E/P. Its 33 I/O pins can scan a 4x4 matrix (8 lines), drive a multiplexed 4-digit 7-segment display (12 lines) and still have lines left for status LEDs and buzzer control. The 200 ns instruction cycle debounces keys and refreshes multiplexed displays without visible flicker. PORTB interrupt-on-change lets the MCU wake from Sleep the instant a key is pressed, cutting average power in battery-powered panels. The on-chip analog comparator can be reused for low-battery detection, eliminating a dedicated supervisor IC. Compared with PIC16C66 or PIC16C65A parts, the PIC16C662 has identical I/O capability at the same 20 MHz speed, so panel designs port freely within the family.
Recommended
Security and Access-Control Panels
Security panels, access-control keypads and alarm systems rely on a low-cost 8-bit MCU to read the keypad, drive indicator LEDs, sound the buzzer, and supervise the backup battery. The PIC16C662-20E/P's 7 KB OTP memory locks down the alarm logic at production, which is preferred for security products where end-user firmware modification is undesirable. The 33 I/O lines support multiple zone inputs and relay outputs, and the analog comparator provides a hardware battery-voltage monitor without an extra IC. The watchdog timer resets the MCU on firmware hang, an essential fail-safe for unattended alarm panels. PORTB's interrupt-on-change feature wakes the device immediately on a keypad event, while Sleep mode keeps quiescent current low during long standby periods. The DIP-40 package simplifies programming and rework during the prototyping and certification phases.
Recommended
HVAC and Climate-Control Modules
HVAC and climate-control modules — wall thermostats, fan-speed controllers, and small damper actuators — need a rugged MCU with enough I/O for temperature sensors, push-buttons, relays and triac outputs, which the PIC16C662-20E/P supplies. Its automotive Extended temperature grade handles the wide thermal swing of an equipment-room or outdoor enclosure, while the 20 MHz clock executes PID-style fan-control loops at sub-millisecond update rates. The analog comparator directly senses thermistor bridges, simplifying the analog front end. PORTB interrupt-on-change provides instant wake on a button press or thermostat dial rotation, dropping standby current for battery-backed wireless thermostats. The 7 KB OTP memory holds the calibration tables and the PID constants once the design is locked, supporting a long production life. The DIP-40 package suits low-volume HVAC OEM runs where ease of programming outweighs the need for SMT.
Recommended
Educational and Hobbyist Projects
Because the PIC16C662-20E/P is in the classic 40-pin PDIP form factor with breadboard-friendly 0.1 inch pin pitch, it remains a popular choice for university courses, hobbyist projects and training kits that teach 8-bit embedded programming. The 35-instruction PIC16C6x RISC set is widely documented in textbooks and tutorials, so learners can focus on peripheral programming rather than wrestling with a steep learning curve. The 7 KB OTP memory forces students to commit to a final code image, mirroring production-style workflow. The 33 I/O pins, on-chip analog comparator, PORTB interrupts, and watchdog timer provide enough peripherals to cover lab assignments on timers, ADC-free analog sensing, and interrupt-driven design. The 20 MHz clock matches the speed assumptions in most university labs, making timing calculations easy.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C662-20E/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C662-20E/L | PIC16C662-10E/L | PIC16C662-20/PQ | PIC16C66-20/SP |
|---|---|---|---|---|---|
| Package | 40-pin PDIP (DIP-40) | 44-pin PLCC (L) — different package | 44-pin PLCC (L) — different package | 44-pin MQFP (PQ) — different package | 28-pin SPDIP (SP) — different package |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | 8-bit PIC16 RISC | 8-bit PIC16 RISC | 8-bit PIC16 RISC | 8-bit PIC16 RISC | 8-bit PIC16 RISC |
| Maximum Clock | 20 MHz | 20 MHz | 10 MHz (-50%) | 20 MHz | 20 MHz |
| I/O Pins | 33 | 33 | 33 | 33 | 22 (-33%) |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Pin Count | 40 | 44 (+4) | 44 (+4) | 44 (+4) | 28 (-12) |
Key Differentiators
- Pin-compatible code compatibility across the PIC16C66x family (vs PIC16C66-20/SP)
- 40-pin PDIP is breadboard-friendly (vs PIC16C662-20E/L (PLCC-44))
- Extended (Automotive) temperature grade is standard (vs PIC16C662-04I/P (Industrial, 4 MHz))
Design Notes
PIC16C662-20E/P uses OTP (one-time-programmable) EPROM, so the code image is final after programming — a single programming pass is all you get. Verified: Microchip PIC16C662 datasheet. Plan your firmware carefully and validate on a Flash equivalent (e.g. PIC16F946-I/PT) before committing to the OTP part for production. Avoid stacking code-protection bits before you have verified that the programmed image is correct, because code-protected OTP cannot be erased or rewritten. Estimated: development cost of programming rework on OTP is 5-10x the unit price.
Verified: Microchip PIC16C662 datasheet specifies VDD = 4.5 V to 5.5 V. Place 100 nF ceramic decoupling capacitors as close as possible to both VDD pins (11 and 32) and tie both VSS pins (12 and 31) to a solid ground plane. For automotive body modules with long harness wiring, add a 10 µF bulk capacitor at the board entry to suppress load-dump transients. The /P suffix denotes the PDIP package which has higher parasitic inductance than SMT, so pay extra attention to supply decoupling at high switching loads.
Verified: Microchip PIC16C662 datasheet pinout. Place the 20 MHz crystal or resonator (with its load capacitors) within 1 cm of the OSC1 (pin 13) and OSC2 (pin 14) pins, and keep that area of the board free of fast-switching signal traces. Route MCLR (pin 1) directly to the reset supervisor and add the recommended 10 kΩ pull-up and a diode to VDD if the circuit can be hot-plugged. PORTB pins 33-40 retain their PORTB interrupt-on-change function on this family, so keep high-frequency traces away from those pins if you use the wake-from-interrupt feature.
Verified: the PIC16C662 is a CMOS MCU with low active current. Estimated: typical active current at 20 MHz and 5 V is on the order of 10-20 mA, while Sleep current is in the microamp range with the watchdog timer disabled. For automotive Extended temperature operation (-40 °C to +125 °C), the DIP-40 package has ample thermal headroom for the MCU's internal dissipation. Verified: Microchip datasheet. If your application places the MCU next to a power driver or relay bank, derate the local ambient temperature by 10-15 °C to avoid thermal stress on adjacent electrolytic capacitors.
Verified: Microchip PIC16C662 datasheet. The on-chip analog comparator can be used directly for zero-crossing detection on a triac-driven AC line, but keep the comparator inputs (PORTA analog-capable pins) away from relay and triac switching nodes. Add an RC low-pass filter (1 kΩ + 100 nF) in front of the comparator input to reject dv/dt-induced false triggers. Estimated: a 1 kΩ series resistor combined with the 100 nF cap gives a 1.6 µs time constant, sufficient to reject 1 MHz ringing on a 230 V AC line switching edge.
Compliance Information
The PIC16C662-20E/P is rated to the Microchip Extended / Automotive temperature grade (-40 °C to +125 °C), but the public distributor pages reviewed do not explicitly state RoHS, REACH, lead-free, halogen-free or AEC-Q100 status for this exact part number. These compliance attributes must be confirmed against the Microchip product compliance documentation or the latest datasheet environmental statement before automotive-program deployment. The /P suffix denotes a plastic PDIP package (through-hole).
