PIC17C42A-33I/L - 8-Bit 33MHz OTP MCU, 4KB | Microchip
MPN: PIC17C42A-33I/L ✗ اختتامِ زندگیPIC17C42A-33I/L جائزہ
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral interfaces onto one piece of silicon. Within the broader semiconductor taxonomy, a microcontroller is a sub-class of microprocessor that targets embedded control rather than general-purpose computing; the 8-bit class, to which the PIC17C42A belongs, occupies the entry-to-mid level of performance and emphasizes deterministic instruction timing, low pin count, and cost-sensitive integration. The PIC17C4X specifically extended Microchip's baseline PIC16C5X/PIC16CXX architecture with a wider instruction word and a higher 33 MHz clock ceiling.
Key features include an 8.25 MIPS peak throughput, 58 single-word instructions for fast code development, hardware multiply and divide support, a four-channel 8-bit ADC, dual analog comparators, three timer/counter modules (Timer0/Timer1/Timer2), a Universal Synchronous Asynchronous Receiver-Transmitter (USART), and a Capture/Compare/PWM (CCP) peripheral. The 16-bit-wide instruction word and 8-bit data path give the family a RISC-flavored execution model while remaining source-compatible with the PIC16 midrange instruction set.
The PIC17C42A is implemented in CMOS technology with an EPROM/OTP program cell, allowing one-time programmable code storage in production. Its 12-bit-wide instruction bus, 8-bit data ALU, and Harvard architecture let the CPU fetch instructions and data in parallel, which is why most instructions complete in a single 121 ns cycle. Program branches and table reads/writes extend to two cycles, an architectural detail engineers use when bounding interrupt latency.
Typical applications include industrial control subsystems, motor drive signal conditioning, instrumentation front ends, white-goods and appliance controllers, and legacy embedded designs where the PIC17C4X architecture is already in use. The wide temperature grade and the through-hole-friendly PLCC-44 package make it especially suitable for factory-floor equipment and field-replaceable modules. Microchip's own product page recommends migrating to the PIC18F4220 for new designs, since the PIC17C42A is no longer in active production.
When designing with this part, plan for a 5V supply and ensure the external oscillator is matched to the 33 MHz maximum clock. Decouple VDD with 0.1 uF ceramic capacitors placed within 5 mm of each power pin, and reserve the MCLR pin for a proper reset network. Because the part is OTP, firmware must be fully validated before programming - there is no in-circuit reprogramming.
This page synthesizes distributor stock signals, current pricing tiers, a curated set of drop-in compatible alternatives, and practical design notes that go beyond the manufacturer datasheet, giving engineers and procurement teams a single decision-ready reference.
کے لیے ڈراپ اِن متبادل PIC17C42A-33I/L — 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-33I/L (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Program Memory Type, Package, Core Architecture, Program Memory Size, Oscillator Type.
PIC17C42A-33E/L
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC17C42A-33I/P
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC17C43-33I/L
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC17C42A-33E/PT
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC17C42A-33I/L زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| Core | PIC17C, 8-bit |
| Program Memory Type | EPROM/OTP |
| Program Memory Size | 4 KB (2K x 16) |
| RAM Size | 232 x 8 bytes |
| زیادہ سے زیادہ کلاک فریکوئنسی | 33 MHz |
| Instruction Cycle Time | 121 ns (single cycle) |
| Throughput | 8.25 MIPS |
| Instruction Set Size | 58 single-word instructions |
| Number of I/O Pins | 33 |
| پیکیج | 44-LCC (J-Lead, 16.59 x 16.59 mm) |
| Oscillator Type | External |
| آپریٹنگ درجہ حرارت رینج | -40 C to +85 C (Industrial) |
| Timers | 3 (Timer0/Timer1/Timer2) |
| USART | 1 |
| Capture/Compare/PWM | Yes (CCP) |
| Temperature Grade | Industrial |
| Terminal Form | J-Bend (PLCC) |
| Package Code | QCCJ |
PIC17C42A-33I/L پن کنفیگریشن
| پن 1 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| پن 2 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| پن 3 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| پن 4 | RA3/AN3 — PORTA bit 3 / Analog input 3 |
| پن 5 | RA4 — PORTA bit 4 (digital only) |
| پن 6 | RA5 — PORTA bit 5 (digital only) |
| پن 7 | RA6 — PORTA bit 6 (digital only) |
| پن 8 | RA7 — PORTA bit 7 (digital only) |
| پن 9 | OSC1 — External oscillator input |
| پن 10 | OSC2 — External oscillator output |
| پن 11 | RC0 — PORTC bit 0 |
| پن 12 | RC1 — PORTC bit 1 |
| پن 13 | RC2 — PORTC bit 2 |
| پن 14 | RC3 — PORTC bit 3 |
| پن 15 | RC4 — PORTC bit 4 |
| پن 16 | RC5 — PORTC bit 5 |
| پن 17 | RC6 — PORTC bit 6 |
| پن 18 | RC7 — PORTC bit 7 |
| پن 19 | VSS — Ground reference |
| پن 20 | VDD — Positive supply (typical 5 V) |
| پن 21 | RB0/INT — PORTB bit 0 / External interrupt |
| پن 22 | RB1 — PORTB bit 1 |
| پن 23 | RB2 — PORTB bit 2 |
| پن 24 | RB3 — PORTB bit 3 |
| پن 25 | RB4 — PORTB bit 4 |
| پن 26 | RB5 — PORTB bit 5 |
| پن 27 | RB6 — PORTB bit 6 |
| پن 28 | RB7 — PORTB bit 7 |
| پن 29 | MCLR — Master Clear (reset, active low) |
| پن 30 | RD0 — PORTD bit 0 |
| پن 31 | RD1 — PORTD bit 1 |
| پن 32 | RD2 — PORTD bit 2 |
| پن 33 | RD3 — PORTD bit 3 |
| پن 34 | RD4 — PORTD bit 4 |
| پن 35 | RD5 — PORTD bit 5 |
| پن 36 | RD6 — PORTD bit 6 |
| پن 37 | RD7 — PORTD bit 7 |
| پن 38 | RE0 — PORTE bit 0 |
| پن 39 | RE1 — PORTE bit 1 |
| پن 40 | RE2 — PORTE bit 2 |
| پن 41 | T0CKI — Timer0 external clock input |
| پن 42 | VSS — Ground reference (secondary) |
| پن 43 | VDD — Positive supply (secondary) |
| پن 44 | NC — Not connected (per datasheet) |
عام استعمالات
PIC17C42A-33I/L کے لیے موزوں ہے 6 ایپلیکیشنs: Industrial Motor Drive Control Loops, White Goods and Appliance Controllers, Instrumentation and Test Equipment Front Ends, Legacy Embedded Communication Gateways, Automotive Aftermarket and Hobby Modules, Field-Replaceable Industrial Modules.
Industrial Motor Drive Control Loops
The PIC17C42A-33I/L is well suited to industrial motor drive control loops where deterministic 121 ns instruction timing and 8.25 MIPS throughput matter. Its 33 MHz maximum clock and Harvard architecture let a fixed-cycle PI or PID loop close every PWM period, while the on-chip Capture/Compare/PWM peripheral directly drives the gate driver timing. Three timer/counter modules (Timer0/Timer1/Timer2) plus the USART allow simultaneous speed sampling, current-sense ADC reads, and host telemetry over RS-232/RS-485 without an external peripheral chip. The 44-PLCC J-lead package also supports through-hole sockets, which simplifies factory-floor maintenance on legacy drives.
تجویز کردہ
White Goods and Appliance Controllers
The PIC17C42A-33I/L has historically been used in white goods and appliance controllers where its OTP program memory, 33 I/O pins, and industrial -40C to +85C temperature grade meet long-life production runs. The four-channel 8-bit ADC reads thermistor, water-level, and door-switch sensors; the dual analog comparators handle zero-crossing detection for triac-driven heater elements. Because the part is OTP, the firmware is locked at production time, which protects manufacturers from unauthorized code modifications. Its 5 V CMOS core and external oscillator make it straightforward to retrofit into existing appliance platforms with proven reliability.
تجویز کردہ
Instrumentation and Test Equipment Front Ends
The PIC17C42A-33I/L's 8.25 MIPS throughput and on-chip 8-bit ADC make it a workable controller for instrumentation and test equipment front ends that demand deterministic data acquisition. Its USART connects to a host PC or display for command and data logging, while the CCP peripheral handles pulse-width or frequency measurements. The PIC17C instruction set - 58 single-word instructions - keeps firmware compact within the 4 KB OTP budget, leaving room for calibration tables and command parsers. The 44-PLCC J-lead package is well suited to benchtop or rack-mount instrument boards where field-replaceable sockets are valued.
تجویز کردہ
Legacy Embedded Communication Gateways
The PIC17C42A-33I/L can serve as a legacy embedded communication gateway between industrial sensors and a host controller, using its on-chip USART plus software-driven bit-banging for additional serial channels. Its 33 MHz clock and 232 bytes of RAM are sufficient to buffer packets while a higher-level host polls slowly over RS-232 or RS-485. The OTP memory model locks the gateway firmware at production time, which prevents in-field tampering with the protocol stack. The 33 digital I/O pins allow direct interfacing to LED indicators, DIP switches, and discrete control lines without an external I/O expander.
تجویز کردہ
Automotive Aftermarket and Hobby Modules
Although not AEC-Q100 qualified, the PIC17C42A-33I/L remains common in automotive aftermarket and hobby modules where its PIC17C architecture is already established. Its 33 MHz performance and 4 KB OTP allow fixed-cycle timing of fuel injection simulators, gauge drivers, and engine-control demonstrators, while the 44-PLCC package supports easy prototyping on socketed boards. Designers should observe the industrial -40C to +85C temperature grade and avoid under-hood environments that exceed the rating. For new automotive designs, Microchip's PIC18F4220 with flash memory and an active lifecycle is the recommended path.
تجویز کردہ
Field-Replaceable Industrial Modules
The PIC17C42A-33I/L is widely deployed in field-replaceable industrial modules - PLC-style I/O cards, sensor signal conditioners, and process control boards - where its 44-PLCC J-lead package and OTP memory are specified by qualification. The J-lead PLCC accepts both SMT soldering and a through-hole socket, which simplifies field swap without board rework. The 33 MHz clock and 4 KB OTP memory provide enough headroom for protocol stacks (Modbus RTU over USART), calibration tables, and diagnostic routines. Because the family is obsolete, integrators are advised to qualify a second source such as PIC17C43-33I/L for new deployments.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا PIC17C42A-33I/L — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | PIC17C42A-33E/L | PIC17C43-33I/L | PIC17C42A-33E/PT | PIC17C42A-33I/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-TQFP - different package | 40-PDIP - different package |
| Maximum Clock Frequency | 33 MHz | 33 MHz | 33 MHz | 33 MHz | 33 MHz |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
اہم امتیازی خصوصیات
- Same PIC17C4X family instruction set with industrial temperature grade (بمقابلہPIC17C42A-33E/L)
- Larger code space within the same PIC17C instruction set (بمقابلہPIC17C42A-33I/P (40-PDIP variant))
- 44-PLCC J-lead package supports through-hole sockets for field service (بمقابلہPIC17C42A-33E/PT (44-TQFP))
ڈیزائن نوٹس
Decouple every VDD/VSS pair with a 0.1 uF ceramic capacitor placed within 5 mm of the IC pin, and add a 10 uF bulk capacitor near the supply entry point. The PIC17C42A-33I/L is a 5 V CMOS part and the supply trace inductance must be kept low so that high-current I/O transitions do not collapse VDD and trigger spurious resets via MCLR. Use a star-ground topology tying VSS pins together at the chip rather than a daisy-chained ground.
The PIC17C42A-33I/L is OTP (one-time programmable) - once a device is programmed it cannot be erased or rewritten. Validate firmware on a windowed PIC17C42A prototype or PIC18F4220 equivalent before committing to production programming, because field firmware updates are impossible. Also note the part is in Microchip's obsolete lifecycle; qualify a second source such as PIC17C43-33I/L or migrate to PIC18F4220 for new designs.
The 44-PLCC J-lead package has a 1.27 mm pitch with J-bend terminals; reserve space for either SMT soldering or a through-hole PLCC socket so that field-replaceable units can be swapped without board rework. Keep the OSC1/OSC2 trace lengths under 10 mm and surround them with a ground pour to suppress oscillator noise. Route the MCLR reset line away from high-current switching traces and place the MCLR pull-up resistor close to the IC pin.
تعمیل کی معلومات
RoHS/REACH/lead-free status not present in the verified distributor data; the part is in Microchip's obsolete lifecycle so most modern compliance declarations are not actively maintained. AEC-Q100 is not applicable (this is an industrial-grade legacy MCU).
