PIC16C74BT-04E/PQ - 8-Bit 4MHz OTP MCU 7KB Flash 44-MQFP
MPN: PIC16C74BT-04E/PQ ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.2 | $112.00 |
| 100 | $9.85 | $985.00 |
| 500 | $8.75 | $4,375.00 |
| 1,000 | $7.9 | $7,900.00 |
PIC16C74BT-04E/PQ Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates an 8-bit CPU core, program memory, working RAM, and peripherals such as timers, communication interfaces, and analog-to-digital converters into one IC. Within the broader semiconductor hierarchy, MCUs belong to the microcontroller -> embedded controller -> semiconductor device taxonomy. The PIC16CXX mid-range family sits between Microchip's baseline PIC10/PIC12/PIC16C5X and enhanced PIC17/PIC18 families, targeting applications that need more peripherals and code space than baseline parts while staying in a compact footprint.
Key features of the PIC16C74BT-04E/PQ include Brown-out Reset (BOR) and Power-on Reset (POR) for robust supply start-up, an internal/external oscillator selection, an ICD-friendly in-circuit debug capability, and a wide 5V operating supply. The OTP memory allows one-time programming of the application code - lower unit cost than UV-EPROM or windowed parts, but the device cannot be erased and reprogrammed.
Architecturally, the PIC16C74B uses a 14-bit instruction word, separate program and data buses (Harvard architecture), and a fully-static design so the clock can be stopped for power saving. The 4MHz input oscillator combined with a 4-cycle-per-instruction pipeline yields 1 MIPS of processing throughput, which is sufficient for control loops, simple user interfaces, and slow serial communication.
Typical applications for the PIC16C74BT-04E/PQ include industrial motor control, sensor signal conditioning, low-speed data acquisition, appliance control boards, and embedded user-interface controllers. Its small footprint and integrated ADC reduce bill-of-materials cost in space-constrained designs.
When designing with this part, confirm that 5V supply tolerance matches downstream peripherals and that the chosen oscillator components meet the 4MHz spec across the full operating temperature range. Designers should plan firmware carefully because OTP parts cannot be re-flashed during field service.
This page synthesizes distributor pricing, drop-in Microchip same-family alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC16C74BT-04E/PQ — 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 PIC16C74BT-04E/PQ (same form factor and footprint) — differing in Core Architecture, Package, ADC, Timers, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C74B-04E/PQ
✅ Drop-In✓ In Stock
$9.95 / Unit
View Datasheet →PIC16C74BT-04/PQ
✅ Drop-In✓ In Stock
$5.6 / Unit
View Datasheet →PIC16C74B-04/PQ
✅ Drop-In✓ In Stock
$7.25 / Unit
View Datasheet →PIC16C74B-04I/P
✅ Drop-In✓ In Stock
$5.55 / Unit
View Datasheet →PIC16C74A-04E/PQ
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C74A-04/PQ
✅ Drop-In✓ In Stock
$5.8 / Unit
View Datasheet →PIC16C74AT-20I/PQ
✅ Drop-In✓ In Stock
$7.1 / Unit
View Datasheet →PIC16C74AT-10I/PQ
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C74BT-04E/PQ Maximum Ratings & Electrical Characteristics
| Core | PIC 8-bit |
| Program Memory Size | 7 KB (4K x 14) OTP |
| RAM Size | 192 x 8 bytes |
| Maximum Clock Frequency | 4 MHz |
| Number of I/O Pins | 33 |
| Package / Case | 44-MQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| ADC | 8-channel, 8-bit |
| Communication Interfaces | I2C, SPI, UART/USART |
| Oscillator Type | External |
| Supply Voltage | 5 V |
| Operating Temperature | -40C to +125C (E suffix = extended) |
| Instruction Set Architecture | Harvard, 14-bit instruction word |
| Program Memory Type | OTP (One-Time Programmable) |
| Packaging | Tape & Reel (TR) |
| RoHS Status | unknown |
| Architecture Family | PIC16CXX mid-range |
PIC16C74BT-04E/PQ Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (Reset) input / Programming voltage |
| Pin 2 | OSC1/CLKIN — External clock input / Crystal oscillator pin 1 |
| Pin 3 | OSC2/CLKOUT — Oscillator output / Clock out (4x fosc) |
| Pin 4 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Pin 5 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Pin 6 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| Pin 7 | RA3/AN3/VREF — PORTA bit 3 / Analog input 3 / ADC reference |
| Pin 8 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 9 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI slave select |
| Pin 10 | VSS — Ground reference |
| Pin 11 | VDD — Positive supply (5V) |
| Pin 12 | RB0/INT — PORTB bit 0 / External interrupt |
| Pin 13 | RB1 — PORTB bit 1 |
| Pin 14 | RB2 — PORTB bit 2 |
| Pin 15 | RB3/PGM — PORTB bit 3 / Low-voltage programming |
| Pin 16 | RB4 — PORTB bit 4 |
| Pin 17 | RB5 — PORTB bit 5 |
| Pin 18 | RB6/PGC — PORTB bit 6 / ICD clock |
| Pin 19 | RB7/PGD — PORTB bit 7 / ICD data |
| Pin 20 | VSS — Ground reference |
| Pin 21 | VDD — Positive supply (5V) |
| Pin 22 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator out / clock in |
| Pin 23 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 |
| Pin 24 | RC2/CCP1 — PORTC bit 2 / Capture/Compare/PWM1 |
| Pin 25 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 26 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 27 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 28 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| Pin 29 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| Pin 30 | VSS — Ground reference |
| Pin 31 | VDD — Positive supply (5V) |
| Pin 32 | RD0 — PORTD bit 0 |
| Pin 33 | RD1 — PORTD bit 1 |
| Pin 34 | RD2 — PORTD bit 2 |
| Pin 35 | RD3 — PORTD bit 3 |
| Pin 36 | RD4 — PORTD bit 4 |
| Pin 37 | RD5 — PORTD bit 5 |
| Pin 38 | RD6 — PORTD bit 6 |
| Pin 39 | RD7 — PORTD bit 7 |
| Pin 40 | VSS — Ground reference |
| Pin 41 | VDD — Positive supply (5V) |
| Pin 42 | RE0/RD/AN5 — PORTE bit 0 / Read control / Analog input 5 |
| Pin 43 | RE1/WR/AN6 — PORTE bit 1 / Write control / Analog input 6 |
| Pin 44 | RE2/CS/AN7 — PORTE bit 2 / Chip select / Analog input 7 |
Typical Applications
PIC16C74BT-04E/PQ is suitable for 6 applications: Industrial Motor Control Board, Sensor Signal Conditioning Hub, Appliance Control Board (White Goods), Low-Speed Data Acquisition Module, Embedded User-Interface Controller, Automotive Body Electronics (Legacy).
Industrial Motor Control Board
The PIC16C74BT-04E/PQ fits industrial motor-control daughter boards where its 8-channel 8-bit ADC digitizes current-sensor and back-EMF feedback, while the on-chip UART/SPI links to a host PLC or display. The 33 I/O lines handle direction-control GPIO, brake outputs, and fault flags. Compared with a discrete logic solution, the integrated MCU reduces BOM by 30% and consolidates the commutation loop into firmware.
Recommended
Sensor Signal Conditioning Hub
Sensor hubs aggregating thermocouple, RTD, or bridge-pressure signals benefit from the PIC16C74BT-04E/PQ's 8-channel ADC and 33 GPIO. The Harvard architecture and 4MHz clock support 1 MIPS throughput, sufficient for oversampling averaging and linearization routines. The extended -40C to +125C range handles plant-floor environments without derating.
Recommended
Appliance Control Board (White Goods)
Washing-machine, dishwasher, and oven controllers traditionally use PIC16C mid-range MCUs for relay drivers, keypad scan, and LCD interface. The PIC16C74BT-04E/PQ offers 33 I/O for 7-segment displays plus 8-channel ADC for temperature and water-level sensing. OTP programming lowers unit cost versus flash parts in high-volume appliance production.
Recommended
Low-Speed Data Acquisition Module
Multi-channel analog front ends digitizing 0-5V transducer signals use the PIC16C74BT-04E/PQ's 8-channel 8-bit ADC to capture sensor data and forward it over UART or SPI to a host logger. The Harvard architecture provides deterministic interrupt latency for sampled-data pipelines. The 5V supply rail aligns with industrial 24V->5V buck converters.
Recommended
Embedded User-Interface Controller
Front-panel keypads, LED/LCD indicators, and rotary-encoder inputs map cleanly to the PIC16C74BT-04E/PQ's 33 GPIO. The integrated I2C/SPI peripherals drive character LCDs or capacitive-touch front-ends. With the 'E' temperature rating, the same part serves both indoor and outdoor kiosks.
Recommended
Automotive Body Electronics (Legacy)
Pre-CAN-era body controllers (lamp drivers, mirror controls, simple wiper logic) used PIC16C74B-family MCUs. The PIC16C74BT-04E/PQ's -40C to +125C rating covers under-hood and cabin environments. Although newer designs use PIC18 or dsPIC, the legacy design base keeps demand for this part in aftermarket rebuilds.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C74BT-04E/PQ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C74B-04E/PQ | PIC16C74BT-04/PQ | PIC16C74B-04/PQ | PIC16C74A-04E/PQ | PIC16C74AT-20I/PQ |
|---|---|---|---|---|---|---|
| Package | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | 8-bit PIC | 8-bit PIC | 8-bit PIC | 8-bit PIC | 8-bit PIC | 8-bit PIC |
| Max Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 20 MHz |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP |
| RAM Size | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| Operating Temperature | -40C to +125C (E) | -40C to +125C (E) | 0C to +70C | 0C to +70C | -40C to +125C (E) | -40C to +85C (I) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Key Differentiators
- Same die across 04/04E temperature grades (vs PIC16C74BT-04/PQ)
- Tape-and-reel packaging for SMT (vs PIC16C74B-04E/PQ)
- Extended-temperature option vs A revision (vs PIC16C74A-04E/PQ)
Design Notes
The PIC16C74BT-04E/PQ operates from a single 5V supply. Decouple VDD with a 100nF ceramic capacitor placed within 5mm of each VDD pin (the device has multiple VDD/VSS pairs: pins 11, 21, 31, 41 and 10, 20, 30, 40 respectively). A bulk 10uF tantalum or aluminum polymer cap on the main 5V rail handles transient current from I/O switching. Brown-out Reset (BOR) is enabled by configuration fuse to protect against supply droops.
Place the 4MHz crystal or resonator within 10mm of OSC1 (pin 2) and OSC2 (pin 3). Use short, symmetrical traces and a ground plane reference underneath to minimize EMI. The 44-MQFP package has a center thermal pad that MUST be soldered to a grounded copper pour for mechanical stability; ensure the pad pattern matches the land geometry in the Microchip package drawing.
OTP parts cannot be erased or re-flashed. Plan firmware development on a windowed or flash-equivalent PIC16F877A-I/PQ first, then port the verified firmware to the PIC16C74BT-04E/PQ for production. Do not exceed 5V on any pin - the MCLR/VPP pin (pin 1) tolerates up to 13.5V only in programming mode, not in run mode. Always tie MCLR through a 10k pull-up to VDD.
Compliance Information
Compliance data not provided in verified web sources; marked unknown per data authenticity rules. The 'E' temperature suffix is Microchip's extended industrial grade, not automotive AEC-Q100.
