PIC17C42A-33I/L - 8-Bit 33MHz OTP MCU, 4KB | Microchip
Référence : PIC17C42A-33I/L ✗ Fin de vie| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $18.5 | $18,50 |
| 10 | $16.4 | $164,00 |
| 100 | $14.2 | $1 420,00 |
| 500 | $12.1 | $6 050,00 |
| 1 000 | $10.85 | $10 850,00 |
PIC17C42A-33I/L Présentation
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.
Alternatives de remplacement direct pour PIC17C42A-33I/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-33I/L (même facteur de forme et même empreinte) — différant par Program Memory Type, Package, Core Architecture, Program Memory Size, Oscillator Type.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
PIC17C42A-33E/L
✅ Remplacement direct✓ En stock
$10.2 / unité
Voir la fiche technique →PIC17C42A-33I/P
✅ Remplacement direct✓ En stock
$6.2 / unité
Voir la fiche technique →PIC17C43-33I/L
✅ Remplacement direct✓ En stock
$7.1 / unité
Voir la fiche technique →PIC17C42A-33E/PT
✅ Remplacement direct✓ En stock
$8.5 / unité
Voir la fiche technique →PIC17C42A-33I/L Valeurs maximales et caractéristiques électriques
| Core | PIC17C, 8-bit |
| Program Memory Type | EPROM/OTP |
| Program Memory Size | 4 KB (2K x 16) |
| RAM Size | 232 x 8 bytes |
| Fréquence d'horloge maximale | 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 |
| Boîtier | 44-LCC (J-Lead, 16.59 x 16.59 mm) |
| Oscillator Type | External |
| Plage de température de fonctionnement | -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 |
Configuration des broches de PIC17C42A-33I/L
| Broche 1 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Broche 2 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Broche 3 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| Broche 4 | RA3/AN3 — PORTA bit 3 / Analog input 3 |
| Broche 5 | RA4 — PORTA bit 4 (digital only) |
| Broche 6 | RA5 — PORTA bit 5 (digital only) |
| Broche 7 | RA6 — PORTA bit 6 (digital only) |
| Broche 8 | RA7 — PORTA bit 7 (digital only) |
| Broche 9 | OSC1 — External oscillator input |
| Broche 10 | OSC2 — External oscillator output |
| Broche 11 | RC0 — PORTC bit 0 |
| Broche 12 | RC1 — PORTC bit 1 |
| Broche 13 | RC2 — PORTC bit 2 |
| Broche 14 | RC3 — PORTC bit 3 |
| Broche 15 | RC4 — PORTC bit 4 |
| Broche 16 | RC5 — PORTC bit 5 |
| Broche 17 | RC6 — PORTC bit 6 |
| Broche 18 | RC7 — PORTC bit 7 |
| Broche 19 | VSS — Ground reference |
| Broche 20 | VDD — Positive supply (typical 5 V) |
| Broche 21 | RB0/INT — PORTB bit 0 / External interrupt |
| Broche 22 | RB1 — PORTB bit 1 |
| Broche 23 | RB2 — PORTB bit 2 |
| Broche 24 | RB3 — PORTB bit 3 |
| Broche 25 | RB4 — PORTB bit 4 |
| Broche 26 | RB5 — PORTB bit 5 |
| Broche 27 | RB6 — PORTB bit 6 |
| Broche 28 | RB7 — PORTB bit 7 |
| Broche 29 | MCLR — Master Clear (reset, active low) |
| Broche 30 | RD0 — PORTD bit 0 |
| Broche 31 | RD1 — PORTD bit 1 |
| Broche 32 | RD2 — PORTD bit 2 |
| Broche 33 | RD3 — PORTD bit 3 |
| Broche 34 | RD4 — PORTD bit 4 |
| Broche 35 | RD5 — PORTD bit 5 |
| Broche 36 | RD6 — PORTD bit 6 |
| Broche 37 | RD7 — PORTD bit 7 |
| Broche 38 | RE0 — PORTE bit 0 |
| Broche 39 | RE1 — PORTE bit 1 |
| Broche 40 | RE2 — PORTE bit 2 |
| Broche 41 | T0CKI — Timer0 external clock input |
| Broche 42 | VSS — Ground reference (secondary) |
| Broche 43 | VDD — Positive supply (secondary) |
| Broche 44 | NC — Not connected (per datasheet) |
Applications typiques
PIC17C42A-33I/L convient pour 6 applications: 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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour PIC17C42A-33I/L — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | 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 |
Principaux différenciateurs
- Same PIC17C4X family instruction set with industrial temperature grade (vs PIC17C42A-33E/L)
- Larger code space within the same PIC17C instruction set (vs PIC17C42A-33I/P (40-PDIP variant))
- 44-PLCC J-lead package supports through-hole sockets for field service (vs PIC17C42A-33E/PT (44-TQFP))
Notes de conception
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.
Informations de conformité
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).
