PIC16C74A-10/L - 8-Bit 10MHz OTP MCU 7KB | Microchip PLCC-44
MPN: PIC16C74A-10/L ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $13.47 | $13.47 |
| 10 | $12.1 | $121.00 |
| 100 | $10.78 | $1,078.00 |
| 500 | $9.55 | $4,775.00 |
| 1,000 | $8.4 | $8,400.00 |
PIC16C74A-10/L Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/OTP/Flash), data RAM, and peripheral set. The PIC16C family belongs to Microchip's mid-range architecture, which sits between baseline 8-bit cores and 16-bit PIC24/dsPIC devices. OTP-based MCUs are programmed once at production and are preferred for cost-sensitive high-volume products where firmware revisions are not expected after release. The 16C74A targets control-oriented designs that need analog sensing plus digital I/O without the cost of Flash-based silicon.
Key features include an on-chip 8-channel 8-bit A/D converter, a USART for serial communication, a synchronous serial port (SSP) supporting SPI and I2C master/slave modes, three timer modules (Timer0, Timer1, Timer2), a Capture/Compare/PWM (CCP) module, and 33 digital I/O lines with 25 mA sink/source current per pin. The Harvard RISC architecture executes most instructions in a single 200 ns instruction cycle at 10 MHz.
Internally, the PIC16C74A uses a 14-bit instruction word with an 8-bit data path, providing 35 single-cycle instructions. The integrated A/D converter supports both single-ended and differential conversions with selectable reference voltages. Brown-out reset (BOR), watchdog timer (WDT), power-on reset (POR), and in-circuit serial programming (ICSP) are all integrated. The part is specified for commercial, industrial, and extended temperature ranges, with the -10/L variant indicating 10 MHz speed grade and PLCC-44 industrial-temperature package.
Typical applications include industrial process control, instrumentation, sensor signal conditioning, motor drive interfacing, security panels, HVAC controllers, and embedded control nodes. Designers migrating to modern designs should consider the PIC16F74 (Flash-based successor) or PIC16F877A as direct functional replacements; the -10/L variant suits long-life programs where firmware stability over 10+ years is required.
When designing with this part, evaluate OTP programming cost and the absence of in-field firmware update capability. For prototypes and low-volume production, choose a Flash-based PIC16F equivalent; for production runs of >5k units with stable firmware, the PIC16C74A-10/L remains a cost-effective solution. Ensure decoupling and follow Microchip's mid-range reference design for PLL-free oscillator stability.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single source for parametric, lifecycle, and procurement decisions on the PIC16C74A-10/L.
Drop-in alternatives for PIC16C74A-10/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 PIC16C74A-10/L (same form factor and footprint) — differing in Package, Core Architecture, Watchdog Timer, Mounting Type, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C74B-20E/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C74AT-10/L
✅ Drop-In✓ In Stock
$8.25 / Unit
View Datasheet →PIC16C74A-04/PQ
✅ Drop-In✓ In Stock
$5.8 / Unit
View Datasheet →PIC16C74A-04I/P
✅ Drop-In✓ In Stock
$7.5 / Unit
View Datasheet →PIC16C74A-10/L
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$8.4 / Unit
View Datasheet →PIC16C74A-10/L Maximum Ratings & Electrical Characteristics
| Core | PIC16C mid-range 8-bit RISC |
| Program Memory | 7 KB (4K x 14) OTP |
| Data RAM | 192 B |
| Maximum Clock Frequency | 10 MHz |
| Instruction Cycle | 200 ns at 10 MHz |
| Supply Voltage Range | 2.5 V to 6.0 V |
| I/O Pins | 33 |
| A/D Converter | 8-channel, 8-bit |
| Timers | Timer0, Timer1, Timer2 (3 total) |
| CCP Modules | 1 (Capture/Compare/PWM) |
| USART | 1 (SCI) |
| SSP (SPI / I2C) | Yes (master/slave) |
| Operating Temperature Range | -40 C to +85 C (industrial) |
| Package | 44-pin PLCC (J-Lead), 16.59 x 16.59 mm |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC16C74A-10/L Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (reset) / Programming voltage input |
| Pin 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Pin 4 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| Pin 5 | RA3/AN3/VREF — PORTA bit 3 / Analog input 3 / 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 — Oscillator crystal input / external clock |
| Pin 9 | OSC2/CLKOUT — Oscillator crystal output / clock out |
| Pin 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator out / clock in |
| Pin 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / 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 / clock |
| Pin 17 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| Pin 18 | GND — Ground |
| 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 | RE0/RD/AN5 — PORTE bit 0 / Read control / Analog input 5 |
| Pin 29 | RE1/WR/AN6 — PORTE bit 1 / Write control / Analog input 6 |
| Pin 30 | RE2/CS/AN7 — PORTE bit 2 / Chip select / Analog input 7 |
| Pin 31 | RD0 — PORTD bit 0 |
| Pin 32 | RD1 — PORTD bit 1 |
| Pin 33 | RD2 — PORTD bit 2 |
| Pin 34 | RD3 — PORTD bit 3 |
| Pin 35 | RD4 — PORTD bit 4 |
| Pin 36 | RD5 — PORTD bit 5 |
| Pin 37 | RD6 — PORTD bit 6 |
| Pin 38 | RD7 — PORTD bit 7 |
| Pin 39 | NC — Not connected (per datasheet) |
| Pin 40 | NC — Not connected (per datasheet) |
| Pin 41 | NC — Not connected (per datasheet) |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
Typical Applications
PIC16C74A-10/L is suitable for 6 applications: Industrial Process Control, Sensor Signal Conditioning Hub, HVAC and Building Automation, Security and Access Control Panels, Motor Drive Interfacing, Embedded Instrumentation.
Industrial Process Control
The PIC16C74A-10/L fits industrial process control applications through its 8-channel 8-bit A/D converter that reads multiple sensor inputs simultaneously, 33 digital I/O lines that interface directly with 25 mA actuators and relays, and integrated USART plus SSP that connect to industrial networks. With a 10 MHz clock and 200 ns instruction cycle, the MCU handles PID loop calculations at typical 100 Hz control rates without timing margin concerns. The 2.5V-6.0V supply range tolerates 5 V industrial rails with brown-out protection. The OTP program memory suits long-life factory automation deployments where firmware stability over 10+ years outweighs the inability to do field updates. Pin-compatible PIC16F74 is recommended for new designs.
Recommended
Sensor Signal Conditioning Hub
Sensor signal conditioning hubs benefit from the PIC16C74A-10/L's integrated 8-bit A/D converter with selectable reference voltages, allowing direct interface with thermocouples, RTDs, pressure transducers, and 4-20 mA current loops after external amplification. The 192 B of data RAM stores moving averages and calibration coefficients, while the 7 KB OTP holds linearization lookup tables. The SSP port drives SPI-based digital sensors (accelerometers, gyroscopes) alongside analog inputs. Low standby current (1 uA at 3V/32 kHz) supports battery-powered wireless sensor nodes. The MCU's industrial temperature range (-40 C to +85 C) suits outdoor and factory-floor deployments.
Recommended
HVAC and Building Automation
HVAC and building automation controllers leverage the PIC16C74A-10/L's 33 I/O lines to drive triacs, optocouplers, relays, and seven-segment displays for fan speed control, damper actuation, and temperature setpoint interfaces. The Capture/Compare/PWM (CCP) module generates variable-frequency drive signals for motor speed control, while timers track scheduling and compressor anti-short-cycle timing. The integrated USART connects to BACnet, Modbus, or proprietary RS-485 building networks. Wide 2.5V-6.0V supply tolerates fluctuating 24 VAC rectified rails. The OTP memory prevents firmware tampering in deployed controllers, an advantage for commercial building security.
Recommended
Security and Access Control Panels
Security and access control panels use the PIC16C74A-10/L to monitor multiple zones (door sensors, PIR detectors, glass-break sensors) via its 8 A/D channels and 33 digital I/O, with on-chip timers debouncing noisy mechanical inputs and the WDT ensuring firmware recovery from glitches. The OTP memory locks firmware to prevent unauthorized code modification on deployed panels, a regulatory requirement in some jurisdictions. The USART links the panel to central monitoring stations via dialer modems or internet gateways. With 192 B RAM and 7 KB OTP, the MCU holds credential databases and alarm event logs for typical 16-32 zone installations. Industrial temperature grade handles unheated vestibules and equipment rooms.
Recommended
Motor Drive Interfacing
Motor drive interfacing designs use the PIC16C74A-10/L's CCP module for PWM generation driving H-bridge gate signals up to 25 mA per pin, plus the 8-channel A/D converter for back-EMF sensing, current shunt monitoring, and temperature feedback from motor windings. The 10 MHz instruction cycle executes field-oriented control loops at modest RPM with deterministic timing. The USART and SSP enable encoder feedback and communication with higher-level controllers. With 192 B RAM, the MCU holds PI controller state variables and ramp profiles. PLCC-44 socket compatibility simplifies field replacement and prototyping of drive electronics in industrial automation.
Recommended
Embedded Instrumentation
Embedded instrumentation such as portable data loggers, multimeters, and bench-top test equipment benefits from the PIC16C74A-10/L's 8-channel A/D converter sampling up to 8 analog inputs simultaneously, USART driving LCD display controllers or PC interfaces, and 7 KB OTP holding calibration tables and menu firmware. The 2.5V-6.0V supply range supports 3 V battery operation for portable instruments and 5 V operation for line-powered bench equipment. The low-power modes (1 uA standby at 3V/32 kHz) extend battery life in handheld meters. The PLCC-44 package's socket-friendly format aids calibration and firmware verification during manufacturing. Industrial temperature grade ensures accurate readings in production test environments.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C74A-10/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C74B-20E/L | PIC16C74AT-10/L | PIC16C74A-04/PQ | PIC16C74A-04I/P |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | PLCC-44 | PLCC-44 - same | PLCC-44 - same | PLCC-44 - same | PLCC-44 - same |
| Maximum Clock Frequency | 10 MHz | 20 MHz | 10 MHz | 4 MHz | 4 MHz |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP |
| Data RAM | 192 B | 192 B | 192 B | 192 B | 192 B |
| I/O Pins | 33 | 33 | 33 | 33 | 33 |
| A/D Converter | 8-ch, 8-bit | 8-ch, 8-bit | 8-ch, 8-bit | 8-ch, 8-bit | 8-ch, 8-bit |
| Operating Voltage | 2.5 V to 6.0 V | 2.5 V to 6.0 V | 2.5 V to 6.0 V | 2.5 V to 6.0 V | 2.5 V to 6.0 V |
| Carrier Format | Tube | Tube | Tape and Reel | Tube | Tube |
Key Differentiators
- Highest clock speed in the PIC16C74A family variants (vs PIC16C74A-04/PQ)
- Same package and pinout as Flash-based PIC16F74 successor (vs PIC16F74-I/L)
- Industrial temperature grade in PLCC-44 package (vs PIC16C74AT-10/L)
Design Notes
OTP memory is one-time programmable - there is no field firmware update path. Engineers must fully validate firmware on a Flash-based equivalent (PIC16F74-I/L) before committing to OTP production programming. A failed OTP batch cannot be recovered, so plan for prototype validation, programming cost amortization (typically $0.10-0.50 per part), and programming yield loss in NRE calculations.
PLCC-44 sockets (e.g., 3M 8400-series or Aries 44-pin PLCC sockets) are strongly recommended during prototyping and low-volume production to enable easy firmware verification and replacement. Place a 100 nF decoupling capacitor within 5 mm of each VDD pin and a 10 uF bulk capacitor at the board power entry. The MCLR pin requires a 10 kohm pull-up to VDD for normal operation; a manual reset switch to GND is optional for development.
Estimated: at 10 MHz, 5 V operation, the PIC16C74A-10/L core draws approximately 5-10 mA active current plus I/O loading. Brown-out reset should be configured to 4.0 V or 2.7 V depending on supply rail to ensure clean reset behavior. In sleep mode, current drops to under 1 uA typical at 3 V / 32 kHz, making it suitable for battery-backed designs that wake on Watchdog Timer or external interrupt.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - choose PIC16F74-I/L automotive-grade variants for vehicle applications. NRND lifecycle status indicates Microchip is phasing out OTP-based PIC16C parts in favor of Flash-based PIC16F successors.
