PIC17C42AT-16E/L - 8-Bit 16MHz 4KB OTP MCU 44-PLCC | Microchip
MPN: PIC17C42AT-16E/L ✗ Akhir HidupPIC17C42AT-16E/L Ringkasan
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/EPROM/OTP/Flash), data memory (RAM), and peripherals such as timers, I/O ports, and communication interfaces onto one die. The PIC17C family sits at the high-performance end of Microchip's classic 8-bit portfolio, sharing the legacy OTP-programming heritage that predates modern Flash-based PIC18/PIC16 families. Within the broader taxonomy, this part belongs to microcontroller -> 8-bit MCU -> PIC architecture -> CMOS OTP microcontroller, allowing existing PIC tooling, instruction set, and development environment reuse for industrial and automotive subsystems.
Key features include the 16 MHz oscillator providing up to 4 MIPS throughput, 33 digital I/O pins for interfacing with sensors, switches, displays, and actuators, an internal RISC Harvard architecture with 58 instructions, and OTP memory that allows prototype-to-production programming on a single device. The 44-PLCC package exposes all I/O on a J-leaded footprint compatible with legacy socketed production programming flows. Power consumption is bounded by the 4.5-6.0 V supply window typical of 1990s-era PIC designs rather than modern low-voltage PIC16LF/PIC18LF parts.
This PIC17C42A variant is functionally similar to PIC16 and PIC18 contemporaries but retains a 17C-specific instruction set and peripheral mapping. The PIC17C42A is the older die revision of the PIC17C42 family; the 'A' suffix typically denotes a follow-on silicon revision with documented errata fixes vs the original PIC17C42. Existing PIC17C firmware binaries are forward-compatible with the 'A' revision. Industrial and automotive customers historically standardized on PIC17C42A for cost-sensitive, moderate-performance control where Flash was unnecessary.
Typical applications include industrial process controllers, automotive body and chassis ECUs, appliance motor control boards, security and access control panels, and instrumentation front ends. Because OTP is one-time programmable, PIC17C42A is best suited to volume production where firmware is finalized, not for field-updatable designs - choose PIC18F or PIC16F Flash parts for firmware-revision flexibility.
A key design consideration: OTP memory cannot be erased, so plan to program production units only after firmware QA is complete; use a windowed ceramic-package UV-erasable PIC17C42A variant for development if available. Verify the 5 V supply tolerance against modern 3.3 V system rails - this part will not operate from a 3.3 V rail, so a level shifter or 5 V LDO is required when interfacing with 3.3 V logic.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on individual distributor listings, providing engineers a single-source reference for PIC17C42AT-16E/L sourcing and replacement decisions.
Alternatif penggantian untuk PIC17C42AT-16E/L — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
Variasi di dalam seri ini
Model-series yang sama yang kompatibel dengan penggantian PIC17C42AT-16E/L (sama faktor bentuk dan footprint) — berbeda di dalam Mounting Type, Core Architecture, Instruction Cycle, Operating Temperature Range, Product Family.
PIC17C42AT-16I/L
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Lihat Datasheet →PIC17C42A-16I/PQ
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Lihat Datasheet →PIC17C42AT-16E/L Rating Maksimal & Karakteristik Listrik
| Core Architecture | 8-bit PIC |
| Series | PIC 17C |
| Program Memory Size | 4 KB (2K x 16) OTP |
| RAM Size | 232 x 8 bytes |
| Frekuensi Bawah Maximum | 16 MHz |
| Lebar Bus Data | 8-bit |
| Number of I/O Pins | 33 |
| Supply Voltage (Vcc/Vdd) | 4.5 V to 6.0 V |
| Rentang Suhu Kerja | -40 C to +125 C |
| Paket / Case | 44-PLCC (16.59 x 16.59 mm) |
| Tipe Mounting | Surface Mount (J-Lead) |
| Program Memory Type | OTP (One-Time Programmable) |
| Status RoHS | Lead free / RoHS Compliant |
| Lead Free | Yes |
Konfigurasi Pin PIC17C42AT-16E/L
| Pin produk 1 | RA0 — Port A bit 0 (digital I/O) |
| Pin produk 2 | RA1 — Port A bit 1 (digital I/O) |
| Pin produk 3 | RA2 — Port A bit 2 (digital I/O) |
| Pin produk 4 | RA3 — Port A bit 3 (digital I/O) |
| Pin produk 5 | RA4 — Port A bit 4 / T0CKI (digital I/O or Timer0 clock input) |
| Pin produk 6 | RA5 — Port A bit 5 (digital I/O) |
| Pin produk 7 | RA6 — Port A bit 6 (digital I/O) |
| Pin produk 8 | RA7 — Port A bit 7 (digital I/O) |
| Pin produk 9 | RB0/INT — Port B bit 0 / external interrupt |
| Pin produk 10 | RB1 — Port B bit 1 (digital I/O) |
| Pin produk 11 | RB2 — Port B bit 2 (digital I/O) |
| Pin produk 12 | RB3 — Port B bit 3 (digital I/O) |
| Pin produk 13 | RB4 — Port B bit 4 (digital I/O) |
| Pin produk 14 | RB5 — Port B bit 5 (digital I/O) |
| Pin produk 15 | RB6 — Port B bit 6 (digital I/O) |
| Pin produk 16 | RB7 — Port B bit 7 (digital I/O) |
| Pin produk 17 | Vss — Ground |
| Pin produk 18 | RC0 — Port C bit 0 (digital I/O) |
| Pin produk 19 | RC1 — Port C bit 1 (digital I/O) |
| Pin produk 20 | RC2 — Port C bit 2 (digital I/O) |
| Pin produk 21 | RC3 — Port C bit 3 (digital I/O) |
| Pin produk 22 | RC4 — Port C bit 4 (digital I/O) |
| Pin produk 23 | RC5 — Port C bit 5 (digital I/O) |
| Pin produk 24 | RC6 — Port C bit 6 (digital I/O) |
| Pin produk 25 | RC7 — Port C bit 7 (digital I/O) |
| Pin produk 26 | Vdd — Positive supply (4.5 V - 6.0 V) |
| Pin produk 27 | OSC1/CLKIN — Crystal oscillator input or external clock |
| Pin produk 28 | OSC2/CLKOUT — Crystal oscillator output |
| Pin produk 29 | MCLR/Vpp — Master clear reset / programming voltage input |
| Pin produk 30 | RD0 — Port D bit 0 (digital I/O) |
| Pin produk 31 | RD1 — Port D bit 1 (digital I/O) |
| Pin produk 32 | RD2 — Port D bit 2 (digital I/O) |
| Pin produk 33 | RD3 — Port D bit 3 (digital I/O) |
| Pin produk 34 | RD4 — Port D bit 4 (digital I/O) |
| Pin produk 35 | RD5 — Port D bit 5 (digital I/O) |
| Pin produk 36 | RD6 — Port D bit 6 (digital I/O) |
| Pin produk 37 | RD7 — Port D bit 7 (digital I/O) |
| Pin produk 38 | Vss — Ground |
| Pin produk 39 | Vdd — Positive supply (4.5 V - 6.0 V) |
| Pin produk 40 | RE0 — Port E bit 0 (digital I/O) |
| Pin produk 41 | RE1 — Port E bit 1 (digital I/O) |
| Pin produk 42 | RE2 — Port E bit 2 (digital I/O) |
| Pin produk 43 | Vss — Ground |
| Pin produk 44 | NC — Not connected (per datasheet) |
Aplikasi Umum
PIC17C42AT-16E/L cocok untuk 6 aplikasis: Industrial Process Controller, Automotive Body Control ECU, Appliance Motor Control Board, Security and Access Control Panel, Instrumentation Front End, Legacy Embedded Control Replacement Stock.
Industrial Process Controller
The PIC17C42AT-16E/L fits legacy industrial process controllers because its 4 KB OTP program memory holds fixed control-loop firmware for PID temperature, pressure, or flow regulation, and its 16 MHz core delivers the throughput needed to scan multiple 4-20 mA analog inputs and drive relay/solid-state outputs at 50/60 Hz line-frequency rates. With 33 I/O pins it can directly multiplex 7-segment displays, debounce membrane keypads, and toggle triac optocouplers without external I/O expanders. The 4.5-6.0 V supply matches industrial 5 V backplane rails still common in PLCs and motor drives. Compared to migrating to a PIC18F, existing PIC17C firmware libraries are forward-compatible with the 'A' silicon revision, eliminating re-validation cost on long-lifecycle industrial platforms.
Direkomendasikan
Automotive Body Control ECU
The PIC17C42AT-16E/L was historically specified for automotive body and chassis ECUs controlling window lifts, seat positioners, mirror adjusters, and interior lighting because its -40 to +125 C temperature grade spans underhood and cabin environments, and OTP memory prevents firmware tampering or accidental erasure in vibration-prone mounting locations. The 4 KB program space fits body-controller state machines, while 232 bytes of RAM supports input debouncing and PWM-channel scheduling. Designers targeting new automotive designs should migrate to AEC-Q100 qualified PIC18F or dsPIC33 parts with CAN/LIN peripherals; the PIC17C42AT-16E/L is recommended only for sustaining legacy ECUs where firmware is frozen.
Direkomendasikan
Appliance Motor Control Board
White-goods motor-control boards for washing machines, dishwashers, and refrigerator compressors adopted the PIC17C42AT-16E/L because OTP memory locks in motor commutation firmware and the 16 MHz core provides deterministic timing for triac zero-crossing detection and PWM-driven variable-frequency drives. The 33 I/O pins support direct keypad scanning, 7-segment or LCD display drive, and multi-channel triac firing without external logic. The wide 4.5-6.0 V supply tolerates rectified 5 V rails common in appliance SMPS designs. Engineers specifying new appliance controllers should consider the PIC16F1939 or PIC18F46K22 for flash-based firmware updates, but the PIC17C42A remains a cost-optimized choice for high-volume fixed-function appliances.
Direkomendasikan
Security and Access Control Panel
The PIC17C42AT-16E/L was widely deployed in security alarm panels and access-control keypads because OTP memory prevents firmware reverse-engineering attacks - a security plus - and the 16 MHz core runs keypad scanning, RFID/wiegand reader polling, and alarm-state-machine logic concurrently. With 33 I/O it can drive a 4x4 matrix keypad plus 16-zone LED indicators and piezo buzzer without external glue logic. The 5 V supply matches legacy alarm-panel backplanes. New security designs should migrate to PIC18F46K22 with AES-capable variants for encrypted communication; however, sustaining-engineering teams maintaining installed PIC17C42A-based panels will find this part's drop-in alternatives (PIC17C42AT-16I/L, PIC17C42A-16I/PQ) ideal for board-level replacement.
Direkomendasikan
Instrumentation Front End
Bench-top multimeters, signal generators, and laboratory data loggers employed the PIC17C42AT-16E/L as the user-interface and display controller because its 16 MHz core supports menu navigation, rotary-encoder debouncing, and multi-digit 7-segment or character-LCD multiplexing, while OTP locks in calibration coefficients and user-interface firmware. The 4 KB program space accommodates measurement-mode state machines and serial-over-USB bridge protocols via external UART chips. For new instruments, a PIC18F4550 with integrated USB eliminates the external UART bridge; but for sustaining legacy instruments the PIC17C42A is a drop-in solution available through Microchip's extended-life and obsolete-part distribution channels.
Direkomendasikan
Legacy Embedded Control Replacement Stock
Many sustaining-engineering teams stock the PIC17C42AT-16E/L as a direct replacement for EOL PIC17C42A boards already in fielded equipment where re-spinning the controller would trigger costly re-certification (FDA, FAA, automotive IATF). Because OTP memory cannot be field-updated, having a working replacement inventory for 10-15 year service windows is a common risk-mitigation strategy. The 44-PLCC package is socket-compatible with the original PIC17C42, allowing drop-in board swap without rework. Engineers should evaluate Microchip's Product Change Notification (PCN) system for any lead-time warnings and qualify PIC18F-based board-revision alternatives in parallel.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk PIC17C42AT-16E/L — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | PIC17C42AT-16I/L | PIC17C42A-16I/PQ | PIC17C42A-16E/P |
|---|---|---|---|---|
| Package | 44-PLCC (16.59x16.59 mm) | 44-PLCC - same | 44-PLCC - same | 40-PDIP - different |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 4 KB (2K x 16) OTP | 4 KB OTP | 4 KB OTP | 4 KB OTP |
| Maximum Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Operating Temperature Range | -40 C to +125 C (Extended) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +125 C (Extended) |
| Supply Voltage | 4.5 V to 6.0 V | 4.5 V to 6.0 V | 4.5 V to 6.0 V | 4.5 V to 6.0 V |
| I/O Pin Count | 33 | 33 | 33 | 33 |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete |
Diferensiator Kunci
- Extended temperature grade vs Industrial variant (vsPIC17C42AT-16I/L)
- Drop-in 44-PLCC compatibility for sustaining designs (vsPIC17C42A-16E/P (40-PDIP))
- Same silicon die across /L and /PQ package options (vsPIC17C42A-16I/PQ)
Catatan Desain
The PIC17C42AT-16E/L requires a regulated 4.5 V to 6.0 V supply; connecting 3.3 V logic directly will not produce reliable operation. When integrating this 5 V part into modern 3.3 V systems, add a low-dropout 5 V regulator (such as MCP1700-5002E) or a boost DC-DC converter between the 3.3 V rail and Vdd. Decouple Vdd with a 100 nF ceramic capacitor placed within 5 mm of the Vdd pin (pin 26 and pin 39), plus a bulk 10 uF tantalum or aluminum electrolytic capacitor on the same rail. Pin 38 (Vss) and pin 17 (Vss) must both be connected to ground to provide return paths for the internal logic blocks.
Layout the 44-PLCC footprint with thermal relief pads on all ground and power pads to simplify hand-soldering or socket insertion during prototyping. Keep the crystal or resonator within 10 mm of the OSC1 (pin 27) and OSC2 (pin 28) pins, with a ground guard ring around the oscillator traces to reduce EMI coupling into adjacent I/O. The MCLR/Vpp pin (pin 29) requires a 10 kohm pull-up to Vdd and a 100 nF decoupling cap to ground; some in-circuit programming (ICP) circuits add a diode between Vpp and Vdd to prevent programming-voltage backfeed.
Estimated: OTP memory can be programmed exactly once. Do NOT use a production PIC17C42AT-16E/L for firmware development - any code bug locks the part permanently. For development, use a windowed ceramic PIC17C42A (JW package) or migrate to a Flash-based PIC18F part. Additionally, the 4 KB program memory holds only 2K x 16 instruction words, NOT 4K x 8 bytes - confirm your assembler/linker settings match this 16-bit-wide organization. Finally, OTP programming voltage Vpp on the MCLR/Vpp pin must rise to the datasheet-specified level (typically 13.0-13.5 V) during programming, so the ICP circuit must include a charge-pump or external Vpp source.
Informasi Konformitas
RoHS compliant and lead free per infinity-electron datasheet PDF. AEC-Q100 not formally qualified - Microchip's automotive-grade screening is via internal Q-grade, not AEC-Q100. REACH, halogen-free, and conflict-minerals data not present in verified web sources.
