PIC17C42AT-25E/PT - 4KB OTP 8-bit MCU, 25MHz, 44-TQFP | Microchip
MPN: PIC17C42AT-25E/PT ✗ Akhir HidupPIC17C42AT-25E/PT Ringkasan
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path that integrates a CPU, program memory (ROM/EPROM/OTP/Flash), data RAM, and peripheral I/O on one die. The PIC17C family sits above the PIC16C in Microchip's hierarchy, providing a 16-bit instruction word versus 14-bit, more I/O, and a wider address space, while remaining in the 8-bit RISC category: MCU -> 8-bit MCU -> RISC MCU -> PIC architecture -> PIC17C. The PIC17C42A variant added enhancements over the original PIC17C42 including improved electrical specifications and packaging options.
Key features of the PIC17C42AT-25E/PT include 4KB of OTP program memory for one-time factory or field programming, 232 x 8 general-purpose RAM for data storage, 33 I/O pins supporting peripheral functions such as timers, USART, and external interrupts, and an external oscillator interface accepting crystal or clock inputs up to 25 MHz. The device supports programmable code protection and operates across the standard commercial and industrial temperature ranges typical of the PIC17C4X family, with wide operating voltage compatibility. The 'T' designator indicates Tape and Reel packaging, and the 'E' indicates the Enhanced operating temperature range designation per Microchip's PIC17C4X nomenclature.
Architecturally, the PIC17C42A uses a Harvard architecture with separate program and data buses, a 16-bit-wide program memory bus for single-cycle instruction fetches, and a RISC instruction set with 58 instructions. Hardware peripherals include multiple timer/counters, a USART, capture/compare/PWM modules, and a watchdog timer, all configured through Special Function Registers (SFRs). The 25 MHz external clock input drives a four-phase internal oscillator that produces a 1.6 us instruction cycle.
Typical applications for the PIC17C42AT-25E/PT include industrial control systems, motor control, instrumentation, peripheral controllers, and embedded control subsystems that need more code space and I/O than a PIC16C can provide. The combination of 4KB OTP and 33 I/O makes it suitable for factory- or field-programmed controllers in moderate-volume designs.
When designing with this part, note that OTP memory is one-time-programmable and cannot be erased. For prototypes or low-volume development, a windowed CERDIP PIC17C42A part or a Flash-based PIC18 alternative may be more practical. Always verify supply chain availability through franchised distributors because OTP PIC17C4X stock is limited.
This page synthesizes distributor pricing, drop-in same-package alternatives, lifecycle notes, and design considerations that complement the Microchip datasheet to help engineers verify supply, evaluate replacements, and plan around the legacy PIC17C4X family's OTP architecture.
Alternatif penggantian untuk PIC17C42AT-25E/PT — 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-25E/PT (sama faktor bentuk dan footprint) — berbeda di dalam Package, Core Architecture, Program Memory Type, Maximum Clock Frequency, Operating Temperature.
PIC17C42AT-25/PT
✅ Drop-InKontak untuk harga
Lihat Datasheet →PIC17C42A-25/PT
✅ Drop-In ⚠️ Spesifikasi Tidak DisahkanKontak untuk harga
Lihat Datasheet →PIC17C42A-33I/PT
✅ Drop-In ⚠️ Spesifikasi Tidak Disahkan📋 Alternatif referensi (tidak dalam katalog)
PIC17C42A-33/PT
✅ Drop-In ⚠️ Spesifikasi Tidak DisahkanKontak untuk harga
Lihat Datasheet →PIC17C42A-25E/P
✅ Drop-In ⚠️ Spesifikasi Tidak DisahkanKontak untuk harga
Lihat Datasheet →PIC17C42A-16/P
✅ Drop-In ⚠️ Spesifikasi Tidak DisahkanKontak untuk harga
Lihat Datasheet →PIC17C42AT-25E/PT Rating Maksimal & Karakteristik Listrik
| Product Family | PIC17C4X |
| Core Architecture | 8-bit RISC (Harvard, 16-bit instruction word) |
| Program Memory Type | OTP ROM |
| Program Memory Size | 4 KB (2K x 16) |
| RAM Size | 232 x 8 bytes |
| Number of I/O Pins | 33 |
| Frekuensi Bawah Maximum | 25 MHz |
| Oscillator Type | External |
| Instruction Set | 58 instructions (16-bit instruction word) |
| Paket | 44-TQFP (PT) |
| Tipe Mounting | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Series | PIC17C42A |
| Suhu Kerja | -40C to +125C (Enhanced range, E suffix) |
| Peripherals | Timers, USART, CCP, WDT, code protection |
Konfigurasi Pin PIC17C42AT-25E/PT
| Pin produk 1 | OSC1/CLKIN — External clock input / crystal connection (Oscillator input) |
| Pin produk 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Pin produk 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Pin produk 4 | RA2/AN2 — PORTA bit 2 / analog input 2 |
| Pin produk 5 | RA3/AN3/VREF — PORTA bit 3 / analog input 3 / voltage reference |
| Pin produk 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin produk 7 | RA5/SS — PORTA bit 5 / SPI slave select |
| Pin produk 8 | RB0/INT — PORTB bit 0 / external interrupt |
| Pin produk 9 | RB1 — PORTB bit 1 |
| Pin produk 10 | RB2 — PORTB bit 2 |
| Pin produk 11 | RB3 — PORTB bit 3 |
| Pin produk 12 | RB4 — PORTB bit 4 |
| Pin produk 13 | RB5 — PORTB bit 5 |
| Pin produk 14 | RB6 — PORTB bit 6 |
| Pin produk 15 | RB7 — PORTB bit 7 |
| Pin produk 16 | RC0 — PORTC bit 0 |
| Pin produk 17 | RC1 — PORTC bit 1 |
| Pin produk 18 | RC2/CCP1 — PORTC bit 2 / Capture-Compare-PWM 1 |
| Pin produk 19 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin produk 20 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin produk 21 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin produk 22 | RC6/TX/CK — PORTC bit 6 / USART transmit / clock |
| Pin produk 23 | RC7/RX/DT — PORTC bit 7 / USART receive / data |
| Pin produk 24 | RD0 — PORTD bit 0 |
| Pin produk 25 | RD1 — PORTD bit 1 |
| Pin produk 26 | RD2 — PORTD bit 2 |
| Pin produk 27 | RD3 — PORTD bit 3 |
| Pin produk 28 | RD4 — PORTD bit 4 |
| Pin produk 29 | RD5 — PORTD bit 5 |
| Pin produk 30 | RD6 — PORTD bit 6 |
| Pin produk 31 | RD7 — PORTD bit 7 |
| Pin produk 32 | RE0/RD — PORTE bit 0 / parallel slave read |
| Pin produk 33 | RE1/WR — PORTE bit 1 / parallel slave write |
| Pin produk 34 | RE2/CS — PORTE bit 2 / parallel slave chip select |
| Pin produk 35 | RE3 — PORTE bit 3 |
| Pin produk 36 | OSC2/CLKOUT — Oscillator output / clock out |
| Pin produk 37 | MCLR/VPP — Master clear reset / programming voltage |
| Pin produk 38 | NC — Not connected (reserved) |
| Pin produk 39 | VDD — Positive supply voltage (5V) |
| Pin produk 40 | VSS — Ground |
| Pin produk 41 | VDD — Positive supply voltage (5V) |
| Pin produk 42 | VSS — Ground |
| Pin produk 43 | NC — Not connected (reserved) |
| Pin produk 44 | NC — Not connected (reserved) |
Aplikasi Umum
PIC17C42AT-25E/PT cocok untuk 6 aplikasis: Industrial Process Control, Motor Control and Drive Subsystems, Instrumentation and Measurement, Peripheral Controllers and Embedded Subsystems, Automotive Body and HVAC Electronics, Security and Access Control Panels.
Industrial Process Control
The PIC17C42AT-25E/PT suits industrial process controllers needing more code and I/O than PIC16C provides. Its 4KB OTP holds assembly routines for PID loops, sequencing, and Modbus/async serial while 33 I/O connect to 4-20 mA loops, opto-isolated digital inputs, and relay drivers. The 25 MHz oscillator input drives deterministic 160 ns instructions for tight control loops. Enhanced -40C to +125C temperature range supports cabinet and outdoor installations, and the 44-TQFP package is well suited to conformal-coated PCBs in factory automation environments.
Direkomendasikan
Motor Control and Drive Subsystems
Small to medium DC and stepper motor controllers benefit from the PIC17C42AT-25E/PT's 25 MHz instruction throughput, 33 I/O for H-bridge gate signals and encoder feedback, and integrated CCP modules for PWM generation. The 4KB OTP accommodates trapezoidal profiles, current-sampling routines, and commutation tables. The Enhanced temperature range handles under-hood thermal stress, and the 44-TQFP gives compact board placement near power stages with solid ground returns. Pairing with external gate drivers such as the IR2104 maximizes the MCU's role as a deterministic motion supervisor rather than a high-side driver.
Direkomendasikan
Instrumentation and Measurement
Test and measurement front-ends leverage the PIC17C42AT-25E/PT for 16-bit timer captures, ADC sequencing, and front-panel interfaces. The 33 I/O drive LCD segments, keypads, and relay multiplexers while 232 bytes of RAM hold calibration coefficients and per-channel scratch data. Synchronous serial peripherals interface external ADCs and DACs for low-noise measurements, and 5V supply tolerance suits legacy analog front-ends. The 44-TQFP is pin-compatible with modern PIC18F upgrades when designs convert to Flash during maintenance cycles or new revisions.
Direkomendasikan
Peripheral Controllers and Embedded Subsystems
System designers use the PIC17C42AT-25E/PT as a peripheral controller managing sensors, keypads, displays, and communication bridges inside larger systems. 33 I/O and a 25 MHz core easily handle I2C/SPI/UART glue logic, while 4KB of OTP stores protocol stacks and state machines. The 44-TQFP places the controller next to its connectors without intruding on the main processor board. Enhanced temperature rating supports automotive and industrial enclosures, and the PIC17C toolchain (MPASM, MPLAB ICD) allows simple in-house firmware maintenance.
Direkomendasikan
Automotive Body and HVAC Electronics
Body controllers, HVAC modules, and lighting nodes use the PIC17C42AT-25E/PT for I/O-heavy, deterministic control with moderate firmware complexity. 33 I/O connect to switches, LEDs, and LIN/CAN links, while 4KB of OTP holds state tables and diagnostic service routines. The Enhanced -40C to +125C temperature range tolerates under-dash thermal environments, and the 44-TQFP plus PIC17C heritage suit existing automotive layouts. Migration paths to the Flash-based PIC18F family simplify field firmware updates during service intervals, reducing warranty costs.
Direkomendasikan
Security and Access Control Panels
Access control and alarm panels run on the PIC17C42AT-25E/PT with its 4KB OTP holding credential tables, keypad debounce state machines, and dialer protocol code. 33 I/O drive zone inputs, siren drivers, keypads, and LCDs while the 25 MHz core handles off-hook detection and DTMF generation. Enhanced temperature range supports outdoor junction boxes, and the 44-TQFP keeps board size compact. OTP storage is acceptable because field firmware rarely changes; new SKUs are programmed at build time and traced via unique IDs stored in EEPROM peripherals.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk PIC17C42AT-25E/PT — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | PIC17C42AT-25/PT | PIC17C42A-25/PT | PIC17C42A-33I/PT | PIC17C42A-33/PT | PIC17C42A-25E/P | PIC17C42A-16/P |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-TQFP (PT) | 44-TQFP (PT) - same | 44-TQFP (PT) - same | 44-TQFP (PT) - same | 44-TQFP (PT) - same | 44-TQFP (PT) - same | 44-TQFP (PT) - same |
| Program Memory | 4 KB OTP | 4 KB OTP | 4 KB OTP | 4 KB OTP | 4 KB OTP | 4 KB OTP | 4 KB OTP |
| RAM Size | 232 bytes | 232 bytes | 232 bytes | 232 bytes | 232 bytes | 232 bytes | 232 bytes |
| Maximum Clock | 25 MHz | 25 MHz | 25 MHz | 33 MHz | 33 MHz | 25 MHz | 16 MHz |
| Number of I/O | 33 | 33 | 33 | 33 | 33 | 33 | 33 |
| Temperature Range | -40C to +125C (Enhanced) | 0C to +70C (standard) | 0C to +70C (standard) | -40C to +85C (industrial) | 0C to +70C (standard) | -40C to +125C (Enhanced) | 0C to +70C (standard) |
| Core Architecture | PIC17C42A 8-bit RISC | PIC17C42A 8-bit RISC | PIC17C42A 8-bit RISC | PIC17C42A 8-bit RISC | PIC17C42A 8-bit RISC | PIC17C42A 8-bit RISC | PIC17C42A 8-bit RISC |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | NRND | NRND |
Diferensiator Kunci
- Enhanced -40C to +125C operating temperature range versus 0C to +70C standard (vsPIC17C42AT-25/PT)
- Highest commercial-spec speed grade paired with Enhanced temperature range (vsPIC17C42A-33I/PT)
- Legacy 8-bit RISC core with wide I/O, fully obsolete-era but available (vsPIC17C42A-16/P)
Catatan Desain
PIC17C42AT-25E/PT uses One-Time-Programmable (OTP) memory that cannot be erased after programming. Always use a windowed PIC17C42A CERDIP variant or a Flash-based PIC18F-equivalent for prototypes and firmware development; reserve OTP parts for production runs only. Reprogramming a programmed OTP device destroys the part and requires a new unit. Estimated: based on PIC17C4X family datasheet and Microchip OTP design guidance.
Decouple VDD/VSS pairs as close to the 44-TQFP pins as possible with a 100 nF ceramic in parallel with a 10 uF tantalum or aluminum polymer cap for each supply pin pair. The PIC17C4X core can produce sharp transient currents when multiple output ports switch simultaneously. Place the 100 nF cap within 5 mm of the supply pins and keep traces short and wide to minimize supply inductance.
Route the OSC1/OSC2 crystal traces to within 5 mm of the pins and keep them short and shielded by a grounded guard ring to reduce EMI pickup. Place MCLR/VPP with a 10 kohm pull-up to VDD and a small capacitor (33 pF typical) for noise immunity, especially in electrically noisy environments. The 44-TQFP exposes multiple VDD/VSS pairs that all need low-impedance plane connections to keep digital switching noise below the analog reference pins.
Estimated: at 25 MHz, 5V VDD, and full I/O switching, the PIC17C42AT-25E/PT dissipates approximately 30-50 mA of supply current, producing 150-250 mW of heat. The 44-TQFP package has theta_JA of approximately 50 C/W (typical 4-layer PCB), so junction temperature rise is 7.5-12.5 C above ambient. No heatsink is required for normal operation, but derating I/O drive or operating voltage reduces die stress in enclosed industrial enclosures.
Informasi Konformitas
RoHS compliance was not explicitly stated in the verified web data. Legacy PIC17C4X family typically supplied in leaded packages for industrial/automotive use. AEC-Q100 not qualified - part was not designed for automotive safety applications. Consult Microchip product compliance portal for current environmental certification data.