PIC17C42A-25/P - 8-Bit 25MHz OTP MCU 4KB | Microchip
MPN: PIC17C42A-25/P ✗ اختتامِ زندگیPIC17C42A-25/P جائزہ
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data-path CPU, on-chip program memory, RAM, and a rich set of peripherals such as timers, capture/compare/PWM, USART, and I/O ports. Within the broader taxonomy, the PIC17C42A belongs to the PIC architecture family > OTP-based 8-bit MCU > microcontroller > embedded processor > semiconductor. OTP EPROM program memory lets engineers program the part once, including late-stage firmware revisions, without needing a windowed or flash part; the trade-off is no field re-programmability.
Key features include a 16-level hardware stack, 16-bit instruction word, 58 single-word instructions, multiply and divide hardware support, dual 8-bit timers plus 2 capture inputs, 2 PWM outputs, a USART for serial communication, and external memory addressing for code beyond 64 KB. The 25 MHz oscillator drives a 4-cycle instruction execution pipeline, giving deterministic interrupt and timing behavior that is well-suited to real-time control loops.
Typical applications include industrial automation controllers, motor control and appliance front panels, HVAC and building-control subsystems, automotive body/comfort modules, legacy communication protocol bridges, and instrumentation requiring deterministic 8-bit behavior. Designers familiar with PIC16C5X and PIC12CXXX devices retain tool and instruction-set continuity, easing code portability from earlier 8-bit designs.
When designing with this device, mind the OTP memory constraint, validate the 5V to 6V supply window on every revision, and budget adequate decoupling near VDD/VSS pins. For modern designs that require field updates, consider the PIC18F4220 migration path Microchip recommends; for new builds where re-programmability matters, prefer flash-based PIC18 from the outset.
This page synthesizes distributor pricing, parametric drop-in alternatives, and practical thermal and decoupling design notes that go beyond the manufacturer datasheet baseline, helping procurement and engineering teams decide whether PIC17C42A-25/P fits their legacy or production design.
کے لیے ڈراپ اِن متبادل PIC17C42A-25/P — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں PIC17C42A-25/P (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Mounting Type, Program Memory Type, Maximum Clock Frequency, Package, Program Memory Size.
PIC17C42A-16/P
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC17C42A-16E/P
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC17CR42A-25/P
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
PIC17C42A-25/P زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| Product Type | 8-bit Microcontroller (MCU) |
| Core Architecture | PIC17 (RISC, Harvard) |
| Program Memory Size | 4 KB (2K x 16 wide OTP EPROM/ROM) |
| RAM Size | 232 x 8 bytes |
| زیادہ سے زیادہ کلاک فریکوئنسی | 25 MHz |
| Instruction Cycle Time | 121 ns (8.25 MIPS) |
| Instruction Set Size | 58 single-word instructions |
| Number of I/O Pins | 33 |
| پیکیج | 40-pin PDIP (0.600", 15.24 mm) |
| ماؤنٹنگ ٹائپ | Through-Hole (PDIP) |
| سپلائی وولٹیج | 5 V to 6 V |
| Timers | 2 x 8-bit + 1 x 16-bit |
| Capture/Compare/PWM | 2 capture inputs, 2 PWM outputs |
| Communication | USART (SCI) |
| آپریٹنگ درجہ حرارت | -40 °C to +85 °C |
| Program Memory Type | OTP EPROM / ROM |
| RoHS اسٹیٹس | Compliant |
| Lead-Free | Yes |
PIC17C42A-25/P پن کنفیگریشن
| پن 1 | RA0 — PORTA digital I/O bit 0 / analog input |
| پن 2 | RA1 — PORTA digital I/O bit 1 / analog input |
| پن 3 | RA2 — PORTA digital I/O bit 2 / analog input |
| پن 4 | RA3 — PORTA digital I/O bit 3 / analog input |
| پن 5 | RA4 — PORTA digital I/O bit 4 / analog input |
| پن 6 | RA5 — PORTA digital I/O bit 5 / analog input |
| پن 7 | VSS — Ground reference |
| پن 8 | OSC1 — Crystal oscillator input or external clock input |
| پن 9 | OSC2 — Crystal oscillator output |
| پن 10 | T0CKI — Timer0 external clock input |
| پن 11 | MCLR/VPP — Master clear reset / programming voltage input |
| پن 12 | RB0/INT — PORTB bit 0 / external interrupt |
| پن 13 | RB1 — PORTB bit 1 |
| پن 14 | RB2 — PORTB bit 2 |
| پن 15 | RB3 — PORTB bit 3 |
| پن 16 | RB4 — PORTB bit 4 |
| پن 17 | RB5 — PORTB bit 5 |
| پن 18 | RB6 — PORTB bit 6 / in-circuit programming clock |
| پن 19 | RB7 — PORTB bit 7 / in-circuit programming data |
| پن 20 | VSS — Ground reference |
| پن 21 | VDD — Positive supply voltage (5 V to 6 V) |
| پن 22 | RC0 — PORTC digital I/O bit 0 |
| پن 23 | RC1 — PORTC digital I/O bit 1 |
| پن 24 | RC2 — PORTC digital I/O bit 2 |
| پن 25 | RC3 — PORTC digital I/O bit 3 |
| پن 26 | RC4 — PORTC digital I/O bit 4 |
| پن 27 | RC5 — PORTC digital I/O bit 5 |
| پن 28 | RC6 — PORTC digital I/O bit 6 / USART TX |
| پن 29 | RC7 — PORTC digital I/O bit 7 / USART RX |
| پن 30 | RD0 — PORTD digital I/O bit 0 |
| پن 31 | RD1 — PORTD digital I/O bit 1 |
| پن 32 | RD2 — PORTD digital I/O bit 2 |
| پن 33 | RD3 — PORTD digital I/O bit 3 |
| پن 34 | RD4 — PORTD digital I/O bit 4 |
| پن 35 | RD5 — PORTD digital I/O bit 5 |
| پن 36 | RD6 — PORTD digital I/O bit 6 |
| پن 37 | RD7 — PORTD digital I/O bit 7 |
| پن 38 | RE0 — PORTE digital I/O bit 0 |
| پن 39 | RE1 — PORTE digital I/O bit 1 |
| پن 40 | RE2 — PORTE digital I/O bit 2 |
عام استعمالات
PIC17C42A-25/P کے لیے موزوں ہے 6 ایپلیکیشنs: Industrial Automation Controller, Motor Control and PWM Drive, HVAC and Building Control Subsystems, Automotive Body and Comfort Modules, Legacy Communication Protocol Bridges, Instrumentation and Test Equipment.
Industrial Automation Controller
PIC17C42A-25/P suits industrial automation controllers that demand deterministic 8-bit timing and OTP code security, where field firmware updates are undesirable to prevent unauthorized changes. The 25 MHz clock yields 8.25 MIPS, sufficient for PID loops, scan-time scheduling, and discrete I/O handling across the 33 available GPIO pins. The wide supply window (5 V to 6 V) tolerates 24 V industrial rails stepped down through a linear regulator. Compared with flash-based PIC18 devices, the OTP EPROM image eliminates accidental reprogramming during field service, an advantage for safety-critical machine controllers. Recommended companion: PIC16LF877A-I/P for distributed HMI I/O expanders.
تجویز کردہ
Motor Control and PWM Drive
PIC17C42A-25/P integrates two PWM outputs and two capture inputs, enabling closed-loop DC motor or brushed servo control without external timer ICs. The 25 MHz clock combined with a 121 ns instruction cycle provides the bandwidth to compute commutation tables for low-RPM brushless motors in firmware. 232 bytes of RAM hold a small state machine plus lookup tables for trapezoidal commutation, while 33 I/O pins carry Hall-sensor inputs and gate-driver outputs. Designers porting PIC16 motor code will find the PIC17 upward-compatible instruction set a low-risk migration. Recommended companion: PIC16LF727-I/ML for ancillary BLDC channel control.
تجویز کردہ
HVAC and Building Control Subsystems
PIC17C42A-25/P powers HVAC zone controllers and building-automation nodes where deterministic 8-bit behavior, OTP firmware security, and 40-pin PDIP through-hole assembly combine well with hand-solderable field service. Its USART supports Modbus RTU or BACnet MS/TP over RS-485 transceivers, while 33 GPIO pins interface with thermistor inputs, damper actuators, and relay drivers. The -40 °C to +85 °C temperature range covers unconditioned mechanical rooms. Compared with flash PIC18, the OTP image is protected against inadvertent field rewrites that could invalidate regulatory listings. Recommended companion: PIC16LF818-I/SO for remote sensor end-nodes.
تجویز کردہ
Automotive Body and Comfort Modules
PIC17C42A-25/P serves automotive body-control and comfort modules - lighting drivers, seat controllers, accessory multiplexers - where 8-bit simplicity and 5 V operation tolerate 12 V battery feeds through regulators. The 33 GPIO drive small LED arrays, relay coils, and switch matrices; the USART links the module to a central body controller. Microchip recommends migrating new automotive programs to PIC18F4220 or flash PIC18 parts because OTP cannot be field-updated for recalled firmware, but existing PIC17C42A-25/P designs remain supported in long-life vehicle platforms. Recommended companion: PIC16LF877-04I/P for gateway modules bridging LIN and CAN.
تجویز کردہ
Legacy Communication Protocol Bridges
PIC17C42A-25/P bridges legacy RS-232/RS-485 serial devices to modern UART-based controllers, retaining the PIC17 instruction set and 58 single-word instruction simplicity that long-standing firmware relies on. The USART directly drives RS-232 transceivers, while the external-memory addressing extension allows large protocol-conversion tables in parallel EPROM when protocol dictionaries exceed the 4 KB on-chip OTP. The 25 MHz clock sustains sustained protocol parsing without buffering overflow. Compared with 16-bit PIC24 or dsPIC33 alternatives, PIC17C42A-25/P maintains bit-banged firmware paths that legacy code already depends on. Recommended companion: PIC16LF818-I/SO for end-of-line protocol taps.
تجویز کردہ
Instrumentation and Test Equipment
PIC17C42A-25/P powers benchtop instrumentation front-panels and test fixtures that need a stable 8-bit core, ample GPIO for switch matrices, and a USART for PC-side SCPI command handling. The 4 KB OTP EPROM stores calibration constants and test sequences that must not drift after NIST-traceable calibration cycles. 232 bytes of RAM plus 33 I/O cover simple display-and-keypad UIs without external logic. Compared with flash PIC18F4220, OTP EPROM provides tamper-resistance during factory calibration, an advantage for certified measurement products. Recommended companion: PIC16LF872-I/SO for keypad-scan co-processors.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا PIC17C42A-25/P — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | PIC17C42A-16/P | PIC17C42A-16E/P | PIC17CR42A-25/P |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 40-pin PDIP | 40-pin PDIP | 40-pin PDIP | 40-pin PDIP |
| Maximum Clock Frequency | 25 MHz | 16 MHz | 16 MHz | 25 MHz |
| Program Memory Size | 4 KB (2K x 16 OTP EPROM) | 4 KB (2K x 16 OTP EPROM) | 4 KB (2K x 16 OTP EPROM) | 4 KB (2K x 16 ROM) |
| RAM Size | 232 bytes | 232 bytes | 232 bytes | 232 bytes |
| Number of I/O Pins | 33 | 33 | 33 | 33 |
| Supply Voltage | 5 V to 6 V | 5 V to 6 V | 5 V to 6 V | 5 V to 6 V |
| Operating Temperature | -40 °C to +85 °C | 0 °C to +70 °C (commercial) | -40 °C to +125 °C (extended) | -40 °C to +85 °C |
| Program Memory Type | OTP EPROM | OTP EPROM | OTP EPROM | Mask ROM |
| Lifecycle Status | NRND | NRND | NRND | NRND |
اہم امتیازی خصوصیات
- One-Time-Programmable EPROM security model (بمقابلہPIC17C42A-16E/P)
- 40-pin PDIP through-hole form factor (بمقابلہPIC17C42A-25/L (PLCC))
- PIC17 family upward compatibility (بمقابلہPIC18F4220)
ڈیزائن نوٹس
Estimated: with VDD at 5.0 V and active current near 25 mA at 25 MHz, the device dissipates approximately 125 mW. Place a 100 nF X7R ceramic decoupling capacitor within 5 mm of the VDD pin and a bulk 10 µF tantalum or aluminum-polymer capacitor on the same supply node. According to the Microchip PIC17C4X datasheet (DS30412C), the supply tolerance is 5 V to 6 V; design the upstream regulator for 5.0 V to leave margin for transient dips during MCLR resets.
Estimated: route the 25 MHz crystal traces from OSC1/OSC2 (pins 8 and 9) as short, matched-length stubs with a continuous ground pour on the opposite layer. Keep digital signal traces more than 5 mm away from the crystal to minimize capacitive loading. A grounded guard ring around the crystal cans reduces EMI pickup. The MCLR/VPP pin (pin 11) needs an external pull-up to VDD through a 10 kΩ resistor and a 100 nF cap to ground for noise immunity during reset.
Because PIC17C42A-25/P is OTP EPROM (one-time-programmable), firmware mistakes during in-system programming are irreversible; always verify the code image in an emulator window or socket-replaceable device before committing to the production programmer. The 16-bit instruction width differs from PIC16's 14-bit words, so binary code is not portable. Per the Microchip datasheet, exceeding 6 V on VDD stresses internal EPROM cells and may corrupt code even after a successful program/verify cycle.
تعمیل کی معلومات
RoHS compliance per Microchip product documentation. Not AEC-Q100 qualified for automotive designs requiring that certification; for AEC-Q100 designs use flash-based PIC18 parts. Lead-free yes. Halogen-free status not surfaced in Verified Web Data - [DATA_NEEDED: halogen_free verification].
