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DIP-40 · PIC16F877A-I/P
Active8-bit PIC MCU
PIC16F877A-I/P
Microchip Technology · DIP-40 · 8-bit PIC MCU
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Overview
The PIC16F877A-I/P is a 40-pin PDIP mid-range PIC that remains one of the most widely recognised 8-bit microcontrollers in the industry, largely because two decades of university curricula, textbooks and industrial products were built on it. It executes 35 single-word RISC instructions at DC to 20 MHz (200 ns instruction cycle) from a 4.0 V to 5.5 V supply, with 8K x 14-bit words of flash program memory (about 14 KB), 368 bytes of data SRAM, 256 bytes of data EEPROM and 33 I/O pins across ports A to E. The -I suffix denotes the industrial -40 C to +85 C temperature range and the P suffix the plastic DIP.
Peripherals are generous for its generation: an 8-channel 10-bit ADC, two analog comparators with voltage reference, an MSSP module providing SPI master and I2C master/slave operation, a synchronous/asynchronous USART with 9-bit address detection, an 8-bit parallel slave port for microprocessor-bus style interfacing, three timers (8-bit Timer0 with prescaler, 16-bit Timer1 that can run during sleep, 8-bit Timer2 with period register), and two capture/compare/PWM modules with 10-bit PWM resolution. Add 15 interrupt sources, in-circuit serial programming, two-pin in-circuit debug, brown-out reset, a watchdog with its own RC oscillator, selectable oscillator options and code protection, and the part covers most low-cost control duties.
Two sourcing realities matter. First, the PIC16F877A is a mature, legacy-grade device: Microchip still manufactures it and the 40-pin DIP is a repair-market staple, but for new designs the pin-compatible PIC16F887 (or the modern PIC16F18875) delivers more flash, better peripherals and lower cost. Second, this is one of the most counterfeited ICs on the broker market: blank or lower-density PIC16F876A/877 dies remarked as 877A, and pulled parts with re-tinned leads. Verify electrically - read the device ID and full flash map with a PICkit 3 or ICD, and confirm the EEPROM and SRAM sizes. MOQ for the DIP-40 is one tube (10 pcs) for prototypes; volume orders are 500-1,000 pcs, with Shenzhen stock typically shipping in 1-2 days.
Key Features
- 8K x 14-bit words flash, 368 B SRAM, 256 B EEPROM and 33 I/O in a 40-pin DIP
- DC to 20 MHz operation from a single 4.0 V to 5.5 V supply
- 8-channel 10-bit ADC, two comparators, MSSP (SPI + I2C), USART and parallel slave port
- Two capture/compare/PWM modules plus three timers including a sleep-capable Timer1
- Through-hole package ideal for socketed, field-repairable and teaching hardware
Typical Applications
- Industrial controllers, panel meters and process I/O with legacy PIC firmware
- Appliance and motor control boards that require 5 V tolerant, socketed MCUs
- University labs, training kits and textbook designs built on the 40-pin PIC pinout
- Repair and refurbishment of installed base equipment where the original MCU failed
- Simple data acquisition and datalogging with SPI/I2C sensors and an RS-232 link
Specifications
- Core
- 8-bit PIC RISC (Mid-Range)
- Max Clock
- 20 MHz
- Flash
- 14 KB
- SRAM
- 368 bytes
- EEPROM
- 256 bytes
- I/O Lines
- 33
- Supply Voltage
- 4.0 to 5.5 V
- ADC
- 8-channel, 10-bit
- Pins
- 40
- RoHS
- Compliant
Procurement Tips
For repair and legacy production buy genuine Microchip with lot traceability and run a full-flash program/verify test on receipt; for new designs quote the PIC16F887 in parallel - it is pin compatible, cheaper and avoids a redesign when the 877A eventually reaches end of life.
Frequently Asked Questions
Is the PIC16F877A still in production, or is it obsolete?
Microchip lists the PIC16F877A as an Active product, and the -I/P DIP remains available, but it is a legacy device that Microchip steers new designs away from. The recommended replacements are the PIC16F887 (same 40-pin pinout, 8K x 14 flash, more peripherals) and the modern PIC16F18875 with independent peripherals. For repairs and existing firmware, the 877A is still the correct buy.
What is the difference between PIC16F877A and PIC16LF877A?
Same silicon architecture and pinout. The F version is specified at 4.0 V to 5.5 V; the LF version operates from 2.0 V to 5.5 V for battery and 3.3 V designs, with the usual low-voltage frequency derating. A PIC16F877A will not reliably run at 3.3 V, so do not substitute it into a 3.3 V board.
Can I drop a PIC16F887 into a PIC16F877A socket?
In most cases yes, because Microchip kept the 40-pin pinout compatible, and the 887 adds a second MSSP-capable feature set, more flash and better ADC. You must recompile firmware for the different configuration words and register set, and verify oscillator and brown-out settings. Always prototype before committing a production change.
Why does my PIC16F877A run at only 5 MHz when I fit a 20 MHz crystal?
Check the oscillator configuration bits: HS is required above 4 MHz (XT covers 100 kHz to 4 MHz) and the crystal needs correct load capacitors on OSC1/OSC2. Also confirm the part is genuine and not a remarked lower-grade device, and that MCLR is not being held low. Instruction cycle time is Fosc/4, so a 20 MHz crystal gives a 200 ns cycle.
How do I detect counterfeit PIC16F877A-I/P chips?
Program and verify a test image that touches the entire 8K-word flash, then read back the device ID and check the reported data EEPROM and SRAM sizes with a PICkit 3, PICkit 4 or ICD 4 - remarked 876A dies show 4K words and 192 bytes. Look for laser etching rather than ink, matte-tin leads, uniform date codes and correct weight. We can provide X-ray inspection and an electrical test report per lot.
What is the MOQ and lead time for the DIP-40 version?
Prototype MOQ is one factory tube (10 pcs); volume is 500-1,000 pcs, with TQFP-44 (-I/PT) available for surface-mount assembly. Microchip authorised lead time is typically 10-20 weeks; our Shenzhen stock usually holds thousands of pieces and ships in 1-2 business days.
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