PIC17C42A-25E/L - 8-Bit 25MHz OTP MCU 4KB PLCC | Microchip
Référence : PIC17C42A-25E/L ✗ Fin de vie| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $13.97 | $13,97 |
| 10 | $12.45 | $124,50 |
| 100 | $10.85 | $1 085,00 |
| 500 | $9.6 | $4 800,00 |
| 1 000 | $8.5 | $8 500,00 |
PIC17C42A-25E/L Présentation
An 8-bit microcontroller is a small, self-contained computing element built around an 8-bit data bus and Harvard architecture. The PIC17C42A family sits between baseline PIC16C5X and enhanced PIC16CXX devices in the Microchip PIC hierarchy: PIC16C5X (12-bit instructions, OTP/ROM) -> PIC17C42A (16-bit instructions, OTP, 8.25 MIPS) -> PIC18F (16-bit instructions, Flash, >10 MIPS). It uses a RISC core with only 58 single-word instructions, yet offers significantly more horsepower than earlier PIC16 devices, making it suitable for applications that need real-time response without moving to the PIC18 platform.
Key features include a 25 MHz external clock, an 8-level hardware stack, multiple interrupt sources, two 8-bit timer/counters, a 16-bit timer/counter, a synchronous serial port (SSP) supporting SPI/I2C master modes, an 8-bit parallel slave port, and a USART. The device is built on a low-power CMOS process and operates from 4.5 V to 5.5 V. Compared with later PIC18F devices, PIC17C42A offers a wider supply tolerance and a robust 8-bit ALU optimized for byte-oriented control.
Typical applications include industrial control logic, motor control, automotive body electronics, point-of-sale terminals, security panels, and embedded instrumentation. Per Microchip, the recommended migration path is PIC18F4220 - new designs should generally not start on PIC17C42A.
When designing with PIC17C42A-25E/L, note that it is OTP, not Flash - firmware cannot be re-programmed in-circuit. Use the 'E' windowed (UV-erasable) or emulator variants for prototyping. The 44-PLCC footprint is common with PIC17C43/44 devices, allowing pin-compatible upgrades within the family.
Alternatives de remplacement direct pour PIC17C42A-25E/L — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec PIC17C42A-25E/L (même facteur de forme et même empreinte) — différant par Operating Temperature Range, Package, Peripherals, Oscillator Type, Program Memory Size.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
PIC17C42A-25I/L
✅ Remplacement direct✓ En stock
$7.2 / unité
Voir la fiche technique →PIC17C43-25E/L
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$9.78 / unité
Voir la fiche technique →PIC17C44-25E/L
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
PIC17C42A-25E/P
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$5.6 / unité
Voir la fiche technique →PIC17C42A-25E/L Valeurs maximales et caractéristiques électriques
| Core Architecture | PIC 8-bit RISC |
| Instruction Set Width | 16-bit (58 single-word instructions) |
| Fréquence d'horloge maximale | 25 MHz |
| Performance | 8.25 MIPS (121 ns instruction cycle) |
| Program Memory Size | 4 KB (2K x 16), OTP EPROM |
| RAM Size | 232 x 8 bytes (454 bytes user RAM) |
| Number of I/O Pins | 33 |
| Boîtier | 44-PLCC (J-Lead), 16.59 x 16.59 mm |
| Type de montage | Surface Mount |
| Oscillator Type | External |
| Supply Voltage (Vcc) | 4.5 V to 5.5 V |
| Plage de température de fonctionnement | -40 C to +85 C (E suffix = industrial) |
| Program Memory Type | OTP EPROM (one-time programmable) |
| Hardware Stack | 8 levels |
| Peripherals | SSP (SPI/I2C), USART, 8-bit Parallel Slave Port, 2x 8-bit + 1x 16-bit Timer |
| Statut RoHS | Non-compliant (SnPb finish, PLCC windowed ceramic variant exempt) |
| Legacy Replacement Recommendation | PIC18F4220 |
Configuration des broches de PIC17C42A-25E/L
| Broche 1 | RA0/INT — PORTA bit 0 / external interrupt input |
| Broche 2 | RA1 — PORTA bit 1 |
| Broche 3 | RA2 — PORTA bit 2 |
| Broche 4 | RA3 — PORTA bit 3 |
| Broche 5 | RA4/RTCC — PORTA bit 4 / RTCC I/O |
| Broche 6 | RA5 — PORTA bit 5 |
| Broche 7 | RA6 — PORTA bit 6 |
| Broche 8 | RA7 — PORTA bit 7 |
| Broche 9 | RB0 — PORTB bit 0 |
| Broche 10 | RB1 — PORTB bit 1 |
| Broche 11 | RB2 — PORTB bit 2 |
| Broche 12 | RB3 — PORTB bit 3 |
| Broche 13 | OSC1 — Oscillator input (external clock) |
| Broche 14 | OSC2 — Oscillator output (crystal) |
| Broche 15 | RC0 — PORTC bit 0 |
| Broche 16 | RC1 — PORTC bit 1 |
| Broche 17 | RC2 — PORTC bit 2 |
| Broche 18 | RC3 — PORTC bit 3 |
| Broche 19 | RC4 — PORTC bit 4 |
| Broche 20 | RC5 — PORTC bit 5 |
| Broche 21 | RC6 — PORTC bit 6 |
| Broche 22 | RC7 — PORTC bit 7 |
| Broche 23 | RD0 — PORTD bit 0 / PSP |
| Broche 24 | RD1 — PORTD bit 1 / PSP |
| Broche 25 | RD2 — PORTD bit 2 / PSP |
| Broche 26 | RD3 — PORTD bit 3 / PSP |
| Broche 27 | RD4 — PORTD bit 4 / PSP |
| Broche 28 | RD5 — PORTD bit 5 / PSP |
| Broche 29 | RD6 — PORTD bit 6 / PSP |
| Broche 30 | RD7 — PORTD bit 7 / PSP |
| Broche 31 | RE0 — PORTE bit 0 |
| Broche 32 | RE1 — PORTE bit 1 |
| Broche 33 | VSS — Ground |
| Broche 34 | VDD — Positive supply (4.5-5.5 V) |
| Broche 35 | RE2 — PORTE bit 2 |
| Broche 36 | RE3 — PORTE bit 3 |
| Broche 37 | RF0 — PORTF bit 0 |
| Broche 38 | RF1 — PORTF bit 1 |
| Broche 39 | RF2 — PORTF bit 2 |
| Broche 40 | RF3 — PORTF bit 3 |
| Broche 41 | RF4 — PORTF bit 4 |
| Broche 42 | RF5 — PORTF bit 5 |
| Broche 43 | RB7/PGM — PORTB bit 7 / low-voltage programming |
| Broche 44 | RB6/PGC — PORTB bit 6 / ICSP clock |
Applications typiques
PIC17C42A-25E/L convient pour 6 applications: Industrial Control Logic, Motor Control (BLDC/Stepper), Point-of-Sale Terminals, Security and Alarm Panels, Automotive Body Electronics, Embedded Instrumentation.
Industrial Control Logic
The PIC17C42A-25E/L is well suited to industrial control logic where deterministic real-time response is required. Its 25 MHz core delivers 8.25 MIPS (121 ns instruction cycle), giving the headroom to scan I/O and execute PID-style control loops within tight millisecond budgets. The 33 digital I/O pins interface directly to 5 V industrial sensors, relays, and triac drivers, while the on-chip USART links to RS-485 transceivers for fieldbus-style wiring. OTP memory locks firmware against field tampering, which is desirable in factory-automation equipment. The 4.5-5.5 V supply tolerance tolerates loosely regulated 5 V industrial rails. Note that new designs should migrate to PIC18F4220 for Flash in-field reprogrammability.
Recommandé
Motor Control (BLDC/Stepper)
The PIC17C42A-25E/L can drive small BLDC and stepper motors via PWM generated in firmware or with external driver ICs. The 16-bit timer/counter provides the time base for closed-loop commutation, and the two 8-bit timers handle PWM channels. At 25 MHz / 8.25 MIPS the device sustains commutation update rates above 20 kHz, suitable for sub-100 W motors. Per Microchip datasheet DS30412C, the parallel slave port allows a host MCU to stream motion profiles into the PIC17C42A acting as a co-processor. The OTP memory is well suited to fixed motor-control firmware where the program is finalized at production.
Recommandé
Point-of-Sale Terminals
The PIC17C42A-25E/L has been used historically in point-of-sale terminals where its OTP memory, 5 V I/O, and integrated USART support both magnetic-stripe readers and serial peripherals. The 232 x 8 RAM is sufficient to buffer transaction strings, and 4 KB OTP holds the fixed terminal application. The synchronous serial port (SSP) drives a small SPI display or keyboard scanner, while the parallel slave port connects to the host POS processor for command and response. Its 8.25 MIPS performance handles keystroke debounce and packet framing without DMA. Modern POS designs use Flash-based MCUs, so PIC17C42A is now seen mainly in legacy equipment sustaining existing fleets.
Recommandé
Security and Alarm Panels
The PIC17C42A-25E/L is well matched to security panel applications: deterministic 8.25 MIPS performance guarantees scan loops run on schedule; OTP memory locks firmware to prevent field tampering; and 33 I/O easily accommodates 8-16 zone inputs plus keypad, siren, and dialer outputs. The integrated USART supports digital alarm communicators over the phone line via a modem chip. The parallel slave port enables a touchscreen or LCD module to share I/O with the panel CPU. PIC17C42A's wide 4.5-5.5 V supply tolerance works directly with lead-acid battery-backed 5 V rails common in fire and security panels. New security panels use Flash MCUs to enable remote firmware updates.
Recommandé
Automotive Body Electronics
Automotive body controllers, HVAC panels, and instrument clusters historically employed PIC17C42A-25E/L at 25 MHz for deterministic control of relays, lamps, and displays. Its 5 V digital I/O is well matched to body-electronics drivers like the VNQ500 or BTS432E, while the on-chip timers and PWM channels drive stepper motors in instrument clusters. The 'I' temperature grade variant supports -40 C to +125 C ambient conditions. Note that modern automotive designs require AEC-Q100 qualification, which PIC17C42A does not carry; new automotive programs should use qualified Flash MCUs such as PIC18F4580-I/PT.
Recommandé
Embedded Instrumentation
Embedded instrumentation such as bench-top meters, lab data loggers, and process controllers benefit from the PIC17C42A-25E/L's deterministic 8.25 MIPS core, USART, and parallel slave port. The USART connects to RS-232 instruments or RS-485 multi-drop networks; the parallel slave port interfaces to graphic LCD controllers or external data acquisition front-ends. 4 KB OTP comfortably stores fixed calibration tables and menu code, while 232 x 8 RAM buffers measurement strings. The wide 4.5-5.5 V supply tolerance works with unregulated instrumentation rails. Modern data loggers use Flash-based PIC18 or dsPIC parts, so PIC17C42A appears mainly in legacy instruments with stable firmware.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour PIC17C42A-25E/L — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | PIC17C42A-25I/L | PIC17C43-25E/L | PIC17C44-25E/L | PIC17C42A-25E/P |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC (J-Lead) | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 40-PDIP (different package) |
| Program Memory | 4 KB OTP (2K x 16) | 4 KB OTP | 8 KB OTP | 16 KB OTP | 4 KB OTP |
| RAM | 232 x 8 | 232 x 8 | 454 x 8 | 454 x 8 | 232 x 8 |
| Clock Frequency | 25 MHz | 25 MHz | 25 MHz | 25 MHz | 25 MHz |
| Operating Temperature | -40 C to +85 C | -40 C to +125 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Principaux différenciateurs
- Drop-in PIC17 family member with extended industrial temperature grade (vs PIC17C42A-25I/L)
- Double the program memory in the same PLCC package (vs PIC17C43-25E/L)
- Quadruple program memory in same PLCC package (vs PIC17C44-25E/L)
Notes de conception
PIC17C42A-25E/L is OTP - firmware cannot be re-programmed in-circuit. If there is any chance of firmware revision during development, use the JW windowed ceramic variant or a modern PIC18F4220 flash MCU instead. Programming requires a Microchip PIC17 programmer (e.g., PIC17C-PROG) targeting the LVP/PGC/PGM pins; the high-voltage parallel programming algorithm differs from PIC18.
Decouple VDD with a 0.1 uF ceramic capacitor placed within 1 cm of pin 34, plus a 10 uF bulk electrolytic or tantalum near the IC. The PIC17C42A datasheet recommends a 1k-ohm pull-up on MCLR with a 0.1 uF capacitor to VDD for proper power-on reset. Operating supply is 4.5 V to 5.5 V; under-voltage operation may cause program counter corruption in the 8-level hardware stack without raising an interrupt.
The 44-PLCC J-lead footprint has wider pads (about 0.045 in lead pitch) than QFP/QFN packages, so verify the PCB land pattern matches PLCC-44 rather than QFP-44 - they look similar but PLCC pads extend outward while QFP pads are inward-gullwing. Provide a generous copper pour under the PLCC socket for thermal spreading; the OTP die has moderate thermal resistance. Trace OSC1/OSC2 to a crystal/capacitor network within 1 cm; long oscillator traces pick up noise and cause instruction-cycle jitter.
Informations de conformité
Microchip's OTP PLCC family uses SnPb lead finish and is generally not RoHS compliant; new designs should migrate to PIC18F4220 which is RoHS compliant. AEC-Q100 qualification not documented; choose PIC18F4580-I/PT for AEC-Q100 automotive programs.
