PIC16C74BT-04E/L - 8-Bit 4MHz MCU, 7KB OTP, 44-PLCC | Microchip
MPN: PIC16C74BT-04E/L ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.42 | $9.42 |
| 10 | $8.72 | $87.20 |
| 100 | $7.95 | $795.00 |
| 500 | $7.1 | $3,550.00 |
| 1,000 | $6.5 | $6,500.00 |
PIC16C74BT-04E/L Overview
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, designed for embedded control tasks that require deterministic real-time response, low power, and small footprint. Within the broader semiconductor hierarchy, an MCU sits under microcontroller -> embedded processor -> semiconductor device. The PIC16CXX mid-range family is one of Microchip's classic RISC architectures with a 14-bit instruction word, contrasting with the 16-bit PIC24 and 32-bit PIC32 families.
Key features of the PIC16C74BT-04E/L include an integrated 8-channel 8-bit Analog-to-Digital Converter (ADC), three serial communication peripherals (I2C/SPI, SPI, and UART/USART - the legacy 'SSP' and 'USART' modules of the era), and support for an external oscillator. The automotive-grade 'E' suffix denotes an extended operating temperature grade, while the 'T' denotes tape-and-reel packaging and the '04' designator pins the 4 MHz maximum clock frequency.
Technically, the device uses a Harvard architecture with separate program and data buses, allowing simultaneous instruction fetch and operand access. The 33 I/O pins are multiplexed with analog and peripheral functions, and the chip provides programmable weak pull-ups, interrupt-on-change wake-up, and a watchdog timer for safety-critical designs.
Typical applications include industrial process control modules, automotive body electronics, sensor signal conditioning, motor control drive boards, and legacy embedded controller upgrades where the OTP memory suits low-volume or ruggedized production runs. The 44-PLCC socketed form factor simplifies field service and rapid prototyping.
When designing with this part, note that OTP memory cannot be electrically erased; engineers typically prototype with a windowed UV-erasable CERDIP variant and migrate to OTP only for production. Provide a clean +5V rail and decoupling per the datasheet's recommended layout.
This page synthesizes distributor pricing, drop-in package-matched alternatives, and practical design notes not collected in any single manufacturer or distributor document.
Drop-in alternatives for PIC16C74BT-04E/L — 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/L (same form factor and footprint) — differing in ADC, Package, Timers, Mounting Type, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C74B-04E/L
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$9.3 / Unit
View Datasheet →PIC16C74BT-04I/L
✅ Drop-In✓ In Stock
$4.33 / Unit
View Datasheet →PIC16C74BT-04/PQ
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$5.6 / Unit
View Datasheet →PIC16C74B-04E/PQ
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$9.95 / Unit
View Datasheet →PIC16C74BT-04E/L Maximum Ratings & Electrical Characteristics
| Core | 8-bit RISC (PIC16 mid-range) |
| Program Memory Size | 7 KB (4K x 14) OTP |
| RAM Size | 192 bytes |
| Maximum Clock Frequency | 4 MHz |
| Number of I/O Pins | 33 |
| ADC | 8-channel x 8-bit |
| Operating Temperature Grade | Automotive (extended E grade) |
| Communication Interfaces | I2C/SPI (SSP), SPI, UART/USART |
| Oscillator Type | External |
| Package / Case | 44-PLCC (16.59 x 16.59 mm, J-lead) |
| Terminal Form | J-BEND |
| Package Code | QCCJ (PLCC-44) |
| Packaging | Tape & Reel (TR) |
| Watchdog Timer | Yes |
| Instruction Word Width | 14-bit |
| Architecture | Harvard (separate program/data bus) |
PIC16C74BT-04E/L Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (reset) input / 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 3 / ADC VREF+ |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI slave select |
| Pin 8 | OSC1/CLKIN — External oscillator input |
| Pin 9 | OSC2/CLKOUT — External oscillator output |
| Pin 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / clock input |
| Pin 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| Pin 12 | RC2/CCP1 — PORTC bit 2 / Capture/Compare/PWM 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 TX / USART clock |
| Pin 17 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| Pin 18 | VSS — Ground reference |
| Pin 19 | VDD — Positive supply voltage |
| Pin 20 | RB0/INT — PORTB bit 0 / External interrupt |
| 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 | NC — Not connected (per datasheet) |
| Pin 29 | NC — Not connected (per datasheet) |
| Pin 30 | NC — Not connected (per datasheet) |
| Pin 31 | NC — Not connected (per datasheet) |
| Pin 32 | NC — Not connected (per datasheet) |
| Pin 33 | RD0 — PORTD bit 0 |
| Pin 34 | RD1 — PORTD bit 1 |
| Pin 35 | RD2 — PORTD bit 2 |
| Pin 36 | RD3 — PORTD bit 3 |
| Pin 37 | RD4 — PORTD bit 4 |
| Pin 38 | RD5 — PORTD bit 5 |
| Pin 39 | RD6 — PORTD bit 6 |
| Pin 40 | RD7 — PORTD bit 7 |
| Pin 41 | RE0/RD — PORTE bit 0 / Parallel slave port read |
| Pin 42 | RE1/WR — PORTE bit 1 / Parallel slave port write |
| Pin 43 | RE2/CS — PORTE bit 2 / Parallel slave port chip select |
| Pin 44 | NC — Not connected (per datasheet) |
Typical Applications
PIC16C74BT-04E/L is suitable for 6 applications: Industrial Process Control, Automotive Body Electronics, Sensor Signal Conditioning, Motor Control Drive Boards, Legacy Embedded Controller Upgrades, Educational and Hobbyist Microcontroller Kits.
Industrial Process Control
The PIC16C74BT-04E/L fits industrial process-control modules because of its 33 digital I/O pins and integrated 8-channel 8-bit ADC, which is sufficient for monitoring temperature, pressure, and flow-loop transducers. Its 4 MHz RISC core (1 us instruction cycle) handles PID calculations and HMI key-scan routines deterministically. The 44-PLCC socketed form factor allows field-replacement without desoldering in plant-floor installations.
Recommended
Automotive Body Electronics
The 'E' automotive extended temperature grade makes the PIC16C74BT-04E/L suitable for under-dash body modules, lighting controllers, and HVAC blend-door actuators. Its 8-bit ADC reads thermistor and rheostat inputs while the USART drives body-network communication. Although NRND, the part remains supported by Microchip for ongoing automotive programs with established PPAP documentation.
Recommended
Sensor Signal Conditioning
The on-chip 8-bit ADC and SSP/I2C peripheral allow the PIC16C74BT-04E/L to serve as a low-cost sensor-conditioning front-end that pre-processes analog inputs and forwards calibrated values over SPI to a host processor. The 192-byte RAM holds 64 8-bit samples for moving-average filtering, and the watchdog timer resets the MCU on firmware lock-up, improving field reliability.
Recommended
Motor Control Drive Boards
Stepper and brushed-DC motor control boards benefit from the PIC16C74BT-04E/L's 33 I/O pins for driving H-bridges, optical-encoder inputs, and PWM channels derived from the on-chip timers. The 4 MHz instruction rate is adequate for low-RPM trapezoidal commutation. The 44-PLCC package sits on top of the heatsink area with adequate clearance for power-stage isolation.
Recommended
Legacy Embedded Controller Upgrades
The PIC16C74BT-04E/L is a direct form-fit-function upgrade path for legacy products that originally shipped with the PIC16C74, PIC16C73B, or PIC16C74A on the same 44-PLCC footprint. The OTP memory simplifies firmware security in security-sensitive applications, and the instruction-set-compatible RISC core allows existing assembly code to recompile unchanged for the 74B silicon revision.
Recommended
Educational and Hobbyist Microcontroller Kits
The PIC16C74BT-04E/L remains a teaching tool in university embedded-curriculum labs because of its well-documented mid-range instruction set and 44-PLCC socket that allows students to repeatedly insert and remove the device during firmware development. The 7 KB OTP memory exercises practical consideration of code-space budgeting, mirroring the discipline required by production OTP parts.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C74BT-04E/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C74B-04E/L | PIC16C74BT-04I/L | PIC16C74BT-04/PQ |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC (16.59 x 16.59 mm) | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same |
| Program Memory | 7 KB (4K x 14) OTP | 7 KB (4K x 14) OTP | 7 KB (4K x 14) OTP | 7 KB (4K x 14) OTP |
| RAM | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
| Max Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| I/O Pins | 33 | 33 | 33 | 33 |
| ADC | 8-ch x 8-bit | 8-ch x 8-bit | 8-ch x 8-bit | 8-ch x 8-bit |
| Temperature Grade | Automotive E | Automotive E | Industrial I | Commercial |
| Packaging | Tape & Reel | Tray | Tape & Reel | Tape & Reel |
Key Differentiators
- Automotive 'E' temperature grade with 44-PLCC socket-friendly footprint (vs PIC16C74BT-04I/L)
- Tape-and-reel packaging for automated SMT assembly (vs PIC16C74B-04E/L)
- Legacy Microchip PIC16 mid-range architecture with 7 KB OTP (vs PIC16F74)
Design Notes
The PIC16C74BT-04E/L requires a clean +5V supply rail with a 0.1 uF ceramic decoupling capacitor placed within 5 mm of the VDD pin (pin 19) and a bulk capacitor of at least 10 uF on the board. The PIC16C mid-range family's ADC reference is software-selectable between VDD and VREF+; if high absolute accuracy is required, drive VREF+ (pin 5, shared with RA3/AN3) from a low-noise external reference such as an MCP1525 rather than VDD to avoid ADC gain error on noisy rails.
OTP memory cannot be electrically erased. For development, use a UV-erasable CERDIP or windowed PLCC variant (if available in your product family) or substitute a flash-based PIC16F74 on the same 44-PLCC footprint for prototyping. When migrating from prototype to production, remember that the OTP blank parts must be programmed in a gang programmer before SMT placement - any unprogrammed parts are scrap.
Place the 4 MHz crystal or external oscillator within 10 mm of the OSC1/OSC2 pins (pins 8 and 9) and route the traces symmetrically with a ground guard ring on both sides. Keep the OSC1/OSC2 traces away from the ADC analog inputs (RA0-RA5) and from the USART pins (RC6/RC7) to minimize digital-to-analog crosstalk. Maintain a continuous ground plane under the MCU and place bulk decoupling close to the VDD/VSS pair.
Compliance Information
Verified web data did not include RoHS/REACH declarations. The 'E' suffix indicates an automotive operating temperature grade, but does not by itself imply AEC-Q100 qualification - the part was released prior to widespread AEC-Q100 adoption in the PIC16C OTP family.
