PIC16C74B-04/PT - 8-Bit CMOS MCU, 4MHz, 7KB EPROM, TQFP-44 | Microchip
料号： PIC16C74B-04/PT ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.04 | $4.04 |
| 10 | $3.8 | $38.00 |
| 100 | $3.4 | $340.00 |
| 500 | $2.95 | $1,475.00 |
| 1,000 | $2.55 | $2,550.00 |
PIC16C74B-04/PT 概述
A microcontroller (MCU) is a single-chip computer containing a CPU core, non-volatile program memory, working RAM, and a configurable set of peripheral interfaces. The PIC16C family uses a Harvard RISC architecture with a small instruction set (35 single-word instructions) that lets most instructions execute in one instruction cycle, providing predictable real-time behaviour with simple C or assembly code. PIC16C parts sit in the hierarchy: microcontroller -> embedded MCU -> 8-bit MCU -> CMOS RISC MCU -> Microchip PIC16C family.
Key differentiating features of the PIC16C74B include its parallel EPROM program memory (windowed variants allow UV erasure for prototyping; OTP variants are one-time programmable for production), hardware USART for asynchronous serial communications, and the Capture/Compare/PWM peripheral for timing and motor-control applications. The 8-channel 10-bit equivalent (8-bit on the 74B variant) ADC removes the need for an external converter in mixed-signal designs, while the master SSP supports both SPI and I2C peripherals without additional glue logic.
The architecture separates program and data buses (Harvard), letting instruction fetch and data access occur in the same cycle. EPROM-based program memory is preferred over Flash for legacy designs that need radiation tolerance or long-term retention without frequent firmware updates. The PIC16C74B shares its peripheral set and pinout with later PIC16F and PIC18 K-series migration paths.
Typical applications include industrial control panels, motor-drive signal conditioning, instrumentation front-ends, sensor interfaces with on-chip ADC, and embedded communication front-ends that use the USART or SSP. Its wide operating temperature range and CMOS low-power design make it suitable for harsh-environment embedded systems.
When designing with the PIC16C74B-04/PT, ensure that your compiler toolchain (MPLAB XC8 or legacy HI-TECH PICC) supports the PIC16C OTP/EPROM family and that the EPROM windowed variant is ordered for prototype development, not the OTP-only /PT production variant. Decoupling VDD with 0.1 uF + 10 uF caps and routing the MCLR pull-up correctly are mandatory.
This page combines verified distributor pricing, drop-in alternative MPNs from the PIC16C/PIC16F family, and practical design notes that go beyond the bare datasheet, giving engineers a single source for selection and sourcing.
直接替换替代料： PIC16C74B-04/PT ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： PIC16C74B-04/PT （相同外形与封装尺寸） ——差异在于 Package, Serial Interfaces, Program Memory Size, ADC, Core Architecture.
快速对比工具——选择替代料号进行并排对比：
PIC16F74-I/PT
✅ 直接替换✓ 有现货
$5.55 / 个
查看数据手册 →PIC16F747-I/PT
✅ 直接替换✓ 有现货
$4.4 / 个
查看数据手册 →PIC16C74B-04I/PT
✅ 直接替换✓ 有现货
$6.1 / 个
查看数据手册 →PIC16C74B-20/PT
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$2.05 / 个
查看数据手册 →PIC16C74A-04/PT
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$3.1 / 个
查看数据手册 →PIC16C74B-04/PT 最大额定值与电气特性
| Core Architecture | PIC16C 8-bit RISC (Harvard) |
| Program Memory Type | EPROM (OTP) |
| Program Memory Size | 7 KB (4K x 14 words) |
| RAM | 192 bytes |
| 最大时钟频率 | 4 MHz |
| Instruction Cycle Time | 1 us @ 4 MHz |
| Supply Voltage (VDD) | 4 V to 5.5 V |
| I/O Pins | 33 |
| ADC | 8 channels, 8-bit |
| Timers | 2 x 8-bit + 1 x 16-bit |
| Capture/Compare/PWM | 2 modules |
| Serial Interfaces | SSP (SPI / I2C) + USART |
| 封装 | TQFP-44 (PT) |
| 安装类型 | Surface Mount |
| Instruction Set | 35 single-word instructions |
PIC16C74B-04/PT 引脚配置
| 引脚 1 | MCLR/VPP — Master clear reset input / programming voltage |
| 引脚 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| 引脚 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| 引脚 4 | RA2/AN2 — PORTA bit 2 / analog input 2 |
| 引脚 5 | RA3/AN3/VREF — PORTA bit 3 / analog input 3 / ADC reference |
| 引脚 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| 引脚 7 | RA5/AN4/SS — PORTA bit 5 / analog input 4 / SSP slave select |
| 引脚 8 | RE0/RD/AN5 — PORTE bit 0 / read control / analog input 5 |
| 引脚 9 | RE1/WR/AN6 — PORTE bit 1 / write control / analog input 6 |
| 引脚 10 | RE2/CS/AN7 — PORTE bit 2 / chip select / analog input 7 |
| 引脚 11 | VDD — Positive supply voltage (4 V to 5.5 V) |
| 引脚 12 | VSS — Ground reference |
| 引脚 13 | OSC1/CLKIN — Oscillator crystal input / external clock in |
| 引脚 14 | OSC2/CLKOUT — Oscillator crystal output / clock out |
| 引脚 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| 引脚 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 I/O |
| 引脚 17 | RC2/CCP1 — PORTC bit 2 / CCP1 I/O |
| 引脚 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| 引脚 19 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| 引脚 20 | RC5/SDO — PORTC bit 5 / SPI data out |
| 引脚 21 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| 引脚 22 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| 引脚 23 | RD0/PSP0 — PORTD bit 0 / parallel slave port bit 0 |
| 引脚 24 | RD1/PSP1 — PORTD bit 1 / parallel slave port bit 1 |
| 引脚 25 | RD2/PSP2 — PORTD bit 2 / parallel slave port bit 2 |
| 引脚 26 | RD3/PSP3 — PORTD bit 3 / parallel slave port bit 3 |
| 引脚 27 | RD4/PSP4 — PORTD bit 4 / parallel slave port bit 4 |
| 引脚 28 | RD5/PSP5 — PORTD bit 5 / parallel slave port bit 5 |
| 引脚 29 | RD6/PSP6 — PORTD bit 6 / parallel slave port bit 6 |
| 引脚 30 | RD7/PSP7 — PORTD bit 7 / parallel slave port bit 7 |
| 引脚 31 | VSS — Ground reference |
| 引脚 32 | VDD — Positive supply voltage (4 V to 5.5 V) |
| 引脚 33 | RB0/INT — PORTB bit 0 / external interrupt |
| 引脚 34 | RB1 — PORTB bit 1 |
| 引脚 35 | RB2 — PORTB bit 2 |
| 引脚 36 | RB3 — PORTB bit 3 |
| 引脚 37 | RB4 — PORTB bit 4 |
| 引脚 38 | RB5 — PORTB bit 5 |
| 引脚 39 | RB6/PGC — PORTB bit 6 / ICSP clock |
| 引脚 40 | RB7/PGD — PORTB bit 7 / ICSP data |
| 引脚 41 | AVDD — Analog supply voltage |
| 引脚 42 | AVSS — Analog ground reference |
| 引脚 43 | NC — Not connected (per datasheet) |
| 引脚 44 | NC — Not connected (per datasheet) |
典型应用
PIC16C74B-04/PT 适用于 6 应用s: Industrial Control Panels, Motor Drive Signal Conditioning, Sensor Interface Front-Ends, Instrumentation and Data Acquisition, Embedded Communication Front-Ends, Harsh-Environment Embedded Systems.
Industrial Control Panels
The PIC16C74B-04/PT fits industrial control panels because its 33 digital I/O lines can directly drive relays, optocouplers, and discrete indicator LEDs without external glue logic, while the 8-channel 8-bit ADC reads 4-20 mA sensor signals through a resistor shunt. Its 4 MHz clock and EPROM-based code storage provide deterministic, real-time response to keypad and limit-switch inputs, and the USART links to an HMI or PLC over RS-485 with an external transceiver. Compared with switching to a modern Cortex-M0 part, the PIC16C74B-04/PT keeps BOM cost low for high-volume panel builds.
推荐
Motor Drive Signal Conditioning
The PIC16C74B-04/PT is well suited to motor-drive signal conditioning because its two Capture/Compare/PWM modules can generate timing references for current-sense sampling while the 8-channel ADC reads back-phase currents through external amplifiers. The 192-byte RAM and 35-instruction RISC core let a small state machine decode Hall-sensor inputs and commutate brushless-DC motors up to a few kHz electrical frequency. The EPROM program memory is preferred over Flash for drives in electrically noisy environments, where EPROM retention tolerates repeated voltage transients better than floating-gate cells.
推荐
Sensor Interface Front-Ends
In sensor interface front-ends, the PIC16C74B-04/PT provides on-chip 8-channel 8-bit ADC, USART, and SSP peripherals that remove the need for an external ADC, level translator, or bus expander. Its 4 V to 5.5 V supply range matches common 5 V sensor rails, and the EPROM memory retains calibration data through power cycling without EEPROM wear. Typical circuits condition thermocouple, RTD, or bridge-pressure signals through op-amps into the ADC and stream results to a host over SPI or RS-232, where the PIC16C74B acts as the local microcontroller with deterministic timing.
推荐
Instrumentation and Data Acquisition
The PIC16C74B-04/PT serves instrumentation and data acquisition modules by offering 8 analog input channels sampled by its on-chip ADC, plus USART and SSP for sending converted data to a host processor or display. The PIC16C RISC architecture completes an 8-bit ADC read in a few instruction cycles, supporting sustained sample rates around 20-50 kSPS depending on ADC configuration. With 7 KB of EPROM, designers can fit fixed-point calibration tables and small protocol stacks (Modbus RTU over USART) without external memory, simplifying the BOM for multi-channel acquisition cards.
推荐
Embedded Communication Front-Ends
For embedded communication front-ends, the PIC16C74B-04/PT integrates a hardware USART plus an SSP configurable as SPI master/slave or I2C master/slave, allowing it to bridge between RS-232/RS-485 and an I2C sensor cluster or SPI peripheral. The 33 I/O lines provide enough headroom to add GPIO-controlled chip-select lines, flow-control signals, and status LEDs. The 4 MHz instruction cycle is fast enough to bit-bang simple protocols or run Modbus ASCII/RTU slave stacks, making the PIC16C74B a compact protocol converter on legacy field-bus nodes.
推荐
Harsh-Environment Embedded Systems
The PIC16C74B-04/PT is often chosen for harsh-environment embedded systems where EPROM program memory tolerates radiation and high-temperature retention better than Flash. The industrial-temperature -40C to +85C variant (suffix 'I') supports outdoor enclosures, and the CMOS low-power design keeps quiescent current low for solar- or battery-powered remote nodes. The PIC16C family has a long heritage in aerospace, military, and oil-and-gas downhole tools, so designers can reuse field-proven firmware and reference designs rather than re-validating on a newer architecture.
推荐
推荐产品汇总
工程参考数据： PIC16C74B-04/PT ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | PIC16F74-I/PT | PIC16F747-I/PT | PIC16C74B-04I/PT | PIC16C74B-20/PT |
|---|---|---|---|---|---|
| Package | TQFP-44 (PT) | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory Type | EPROM (OTP), 7 KB | Flash, 7 KB | Flash, 7 KB | EPROM (OTP), 7 KB | EPROM (OTP), 7 KB |
| Maximum Clock Frequency | 4 MHz | 20 MHz | 20 MHz | 4 MHz | 20 MHz |
| Instruction Cycle | 1 us @ 4 MHz | 200 ns @ 20 MHz | 200 ns @ 20 MHz | 1 us @ 4 MHz | 200 ns @ 20 MHz |
| ADC Resolution / Channels | 8-bit / 8 channels | 8-bit / 8 channels | 8/10/12-bit / 14 channels | 8-bit / 8 channels | 8-bit / 8 channels |
| I/O Pins | 33 | 33 | 36 | 33 | 33 |
| Operating Temperature | 0C to +70C (commercial) | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) | 0C to +70C (commercial) |
关键差异点
- EPROM-based code storage for long-term retention （对比 PIC16F74-I/PT)
- On-chip 8-channel 8-bit ADC and USART reduce BOM （对比 PIC16C73B-04/SP (28-pin sibling))
- Stable mature product with long-term Microchip support （对比 ATMEGA8-16PI (Atmel/Microchip 8-bit MCU))
设计说明
Decouple VDD (pin 11, pin 32) with a 0.1 uF ceramic capacitor placed within 5 mm of each VDD pin, and add a single 10 uF tantalum or aluminum bulk capacitor on the same 5 V rail. Place AVDD (pin 41) decoupling (0.1 uF + 10 uF) close to the pin and tie AVSS (pin 42) to the same ground plane as VSS. The PIC16C74B-04/PT draws approximately 5-15 mA active and < 5 uA in sleep, so the bulk capacitor must hold VDD above 4 V during brief transients.
Route the crystal traces (OSC1/OSC2, pins 13-14) as short, symmetrical traces and keep the crystal case grounded to the same ground plane as VSS. Place MCLR (pin 1) pull-up resistor (typically 10 kOhm) close to the pin and avoid long traces that pick up noise; if using ICSP, route PGC (RB6) and PGD (RB7) so the programming header can be reached without removing the IC. For TQFP-44, the exposed thermal pad (if present) should be soldered to a copper pour to lower thermal resistance, though this part dissipates negligible power.
Do not assume the PIC16C74B-04/PT and PIC16F74-I/PT are interchangeable without recompiling the firmware; configuration bits (oscillator, watchdog, brown-out, code protection) differ in default and meaning. The -04 speed grade caps the oscillator at 4 MHz - configuring a 20 MHz crystal with a -04 part will violate the AC timing spec. Also note that EPROM /PT parts are OTP, so firmware bugs cannot be patched after programming; use a windowed CERDIP for prototyping. Estimated: clock input frequency divided by 4 gives instruction cycle frequency per PIC16C family datasheet.
PORTA pins (RA0-RA5) are analog-capable and multiplexed with the ADC; configure them as digital I/O by clearing the corresponding PCFG bits in the ADCON1 register before reading them as digital inputs, otherwise the digital input buffer is disabled. Keep analog traces short and away from the crystal and USART lines to avoid ADC accuracy degradation. For the USART, place the RS-232 or RS-485 transceiver within 50 mm of pins 21-22 (RC6/RC7) to keep the routing short and balanced.
合规信息
RoHS, REACH, lead-free, halogen-free, and conflict-mineral status not stated in the verified web data - set to unknown. The PIC16C74B family is industrial-grade, not AEC-Q100 automotive qualified.
