PIC17C42A-16E/PQ - 16MHz 8-bit OTP MCU, 44-MQFP | Microchip
N.º de pieza: PIC17C42A-16E/PQ ⚠ Última compra| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $9.5 | $9,50 |
| 10 | $8.55 | $85,50 |
| 100 | $7.6 | $760,00 |
| 500 | $6.84 | $3.420,00 |
| 1.000 | $6.08 | $6.080,00 |
PIC17C42A-16E/PQ Descripción general
A microcontroller is a single-chip computer that integrates a CPU, RAM, non-volatile program memory (ROM/Flash/OTP), and peripheral I/O into one package. Within the broader taxonomy of semiconductor devices, microcontrollers sit under microprocessors (which lack on-chip memory and peripherals) and above generic logic ICs in integration level. PIC microcontrollers (Peripheral Interface Controllers) use a modified Harvard architecture with separate program and data buses, enabling single-cycle instruction fetch and deterministic interrupt response favored in real-time control. The PIC17C42A, as a member of the discontinued PIC17C family, sits between the legacy PIC16C and the modern PIC18 in capability and is supported by Microchip's MPLAB IDE toolchain via legacy device support packages.
Key features of the PIC17C42A-16E/PQ include four 8-bit I/O ports (PORTA-PORTD with 33 lines total), a 16-bit timer/counter (TMR0) with 8-bit prescaler, an 11-channel 8-bit ADC, two analog comparators, a Universal Synchronous/Asynchronous Receiver-Transmitter (USART), and a watchdog timer with on-chip RC oscillator for reliable operation. The device supports external, crystal, or RC oscillator modes, and provides a programmable code-protection bit to lock OTP contents against unauthorized read-back, valuable for embedded intellectual-property protection.
Architecturally, the PIC17C42A uses an enhanced Harvard bus with a 16-bit instruction word and 8-bit data path, an 8-level deep hardware stack, and direct register-mapped I/O for deterministic cycle timing. The 16 MHz clock yields 121 ns instruction cycle and 8.25 MIPS throughput, with most instructions executing in a single cycle except for branches (2 cycles). The OTP EPROM cell supports in-circuit programming via the ICSP interface using RB6 (clock) and RB7 (data) pins, enabling field firmware updates on a one-time basis.
Typical applications include industrial automation controllers, automotive body and accessory modules, motor control subsystems, and consumer-electronics appliances where deterministic real-time response is critical. The PIC17C42A is also used in legacy medical instrumentation, security alarm panels, and high-end remote-control products that were originally designed in the late 1990s and require form-fit-function replacement parts. Note that Microchip's product page recommends migrating to the PIC18F4220 for new designs, as the PIC17C42A is on a last-time-buy/EOL track.
When designing with this part, ensure your supply rail stays within the 4.5V-6V range and that decoupling capacitors (0.1 uF ceramic) are placed adjacent to VDD/VSS pairs. The /MCLR reset pin must be pulled high through a 10k resistor and a 100 nF cap to ground for proper power-on-reset behavior. The 44-MQFP package has a 0.8 mm lead pitch, requiring precise reflow profile and aperture design for reliable production soldering.
This page synthesizes distributor pricing, drop-in alternatives (PIC17C42A-16I/PQ, PIC17C42A-16/PQ, etc.), lifecycle status (last-time-buy), and practical design notes not found in the manufacturer datasheet.
Alternativas directas para PIC17C42A-16E/PQ — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con PIC17C42A-16E/PQ (mismo factor de forma y huella) — difiere en Package, Program Memory Type, Mounting Type, RAM Size, Core Architecture.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
PIC17C42A-16/PQ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
PIC17C42A-16I/PQ
✅ Sustitución directa✓ En stock
$8.95 / unidad
Ver hoja de datos →PIC17C42AT-16E/PQ
✅ Sustitución directa✓ En stock
$5.4 / unidad
Ver hoja de datos →PIC17C42A-16E/P
✅ Sustitución directa✓ En stock
$5.85 / unidad
Ver hoja de datos →PIC18F4220-I/PQ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
PIC17C42A-16E/PQ Valores máximos y características eléctricas
| Family | PIC17C |
| Core Architecture | 8-bit PIC Harvard (16-bit instruction word) |
| Instruction Set | 58 single-word instructions |
| Frecuencia de reloj máxima | 16 MHz |
| Instruction Cycle Time | 121 ns (8.25 MIPS) |
| Program Memory Type | OTP (One-Time-Programmable EPROM) |
| Program Memory Size | 4 KB (2K x 16) |
| RAM Size | 232 x 8 bytes |
| Number of I/O Pins | 33 |
| Number of Timers | TMR0 (16-bit) + TMR1/TMR2/TMR3 (8-bit) |
| ADC | 11-channel x 8-bit |
| Analog Comparators | 2 |
| USART | 1 (SCI/SPI mode-selectable) |
| Watchdog Timer | Yes (with on-chip RC oscillator) |
| Supply Voltage (VDD) | 4.5 V to 6 V |
| Rango de temperatura de funcionamiento | -40 C to +125 C (industrial, 'E' suffix) |
| Hardware Stack Depth | 8 levels |
| Oscillator Modes | External, Crystal, RC (selectable via config bits) |
| Encapsulado | 44-MQFP (10x10 mm, PQ suffix) |
| Lead Pitch | 0.8 mm |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant (per Microchip product page) |
| ICSP Programming Pins | RB6 (clock), RB7 (data) |
Configuración de pines de PIC17C42A-16E/PQ
| Pin 1 | /MCLR — Master Clear (Reset) input, active low |
| Pin 2 | RA0 — PORTA bit 0 (digital I/O or analog input) |
| Pin 3 | RA1 — PORTA bit 1 (digital I/O or analog input) |
| Pin 4 | RA2 — PORTA bit 2 (digital I/O or analog input) |
| Pin 5 | RA3 — PORTA bit 3 (digital I/O or analog input) |
| Pin 6 | RA4 — PORTA bit 4 (digital I/O or analog input) |
| Pin 7 | RA5 — PORTA bit 5 (digital I/O or analog input) |
| Pin 8 | RA6 — PORTA bit 6 (digital I/O or analog input) |
| Pin 9 | RA7 — PORTA bit 7 (digital I/O or analog input) |
| Pin 10 | NC — Not connected |
| Pin 11 | VSS — Ground reference |
| Pin 12 | OSC1 — Oscillator input (crystal/external clock) |
| Pin 13 | OSC2 — Oscillator output (crystal drive) |
| Pin 14 | RC0 — PORTC bit 0 (digital I/O) |
| Pin 15 | RC1 — PORTC bit 1 (digital I/O) |
| Pin 16 | RC2 — PORTC bit 2 (digital I/O) |
| Pin 17 | RC3 — PORTC bit 3 (digital I/O) |
| Pin 18 | RC4 — PORTC bit 4 (digital I/O) |
| Pin 19 | RC5 — PORTC bit 5 (digital I/O) |
| Pin 20 | RC6 — PORTC bit 6 (TX/CK - USART asynchronous transmit or I2C clock) |
| Pin 21 | RC7 — PORTC bit 7 (RX/DT - USART receive or SPI data) |
| Pin 22 | RB0 — PORTB bit 0 (digital I/O, external interrupt) |
| Pin 23 | RB1 — PORTB bit 1 (digital I/O, external interrupt) |
| Pin 24 | RB2 — PORTB bit 2 (digital I/O, external interrupt) |
| Pin 25 | RB3 — PORTB bit 3 (digital I/O, external interrupt) |
| Pin 26 | RB4 — PORTB bit 4 (digital I/O, external interrupt) |
| Pin 27 | RB5 — PORTB bit 5 (digital I/O, external interrupt) |
| Pin 28 | RB6 — PORTB bit 6 (digital I/O, ICSP clock) |
| Pin 29 | RB7 — PORTB bit 7 (digital I/O, ICSP data) |
| Pin 30 | VSS — Ground reference |
| Pin 31 | RD0 — PORTD bit 0 (digital I/O) |
| Pin 32 | RD1 — PORTD bit 1 (digital I/O) |
| Pin 33 | VDD — Positive supply voltage (4.5V-6V) |
| Pin 34 | RD2 — PORTD bit 2 (digital I/O) |
| Pin 35 | RD3 — PORTD bit 3 (digital I/O) |
| Pin 36 | RD4 — PORTD bit 4 (digital I/O) |
| Pin 37 | RD5 — PORTD bit 5 (digital I/O) |
| Pin 38 | RD6 — PORTD bit 6 (digital I/O) |
| Pin 39 | RD7 — PORTD bit 7 (digital I/O) |
| Pin 40 | RE0 — PORTE bit 0 (digital I/O or analog comparator output) |
| Pin 41 | RE1 — PORTE bit 1 (digital I/O or analog comparator output) |
| Pin 42 | RE2 — PORTE bit 2 (digital I/O or analog comparator output) |
| Pin 43 | RE3 — PORTE bit 3 (digital I/O) |
| Pin 44 | RE4 — PORTE bit 4 (digital I/O) |
Aplicaciones típicas
PIC17C42A-16E/PQ es adecuado para 6 aplicacións: Industrial Automation Controllers, Automotive Body and Accessory Modules, Consumer Electronics and Appliance Controllers, Motor Control Subsystems, Medical Instrumentation (Legacy Maintenance), Security and Alarm Panels.
Industrial Automation Controllers
The PIC17C42A-16E/PQ fits industrial automation as a deterministic 8-bit control MCU, where its 16 MHz clock and 8.25 MIPS throughput deliver 121 ns instruction cycles suitable for sub-millisecond loop times on motor-control loops, conveyor sequencers, and PLC I/O expanders. The 33 digital I/O pins directly drive optocouplers, relays, and triac interfaces typical in 24V industrial I/O assemblies, while the on-chip 11-channel 8-bit ADC handles analog sensor inputs (temperature, pressure, flow) without external ADCs. The industrial -40 to +125 C operating range covers factory-floor and outdoor cabinet environments, and the 4 KB OTP program memory holds ladder-logic-style structured-text firmware for medium-complexity machines.
Recomendado
Automotive Body and Accessory Modules
In automotive body-control modules such as door-lock controllers, seat-position controllers, and climate-control interfaces, the PIC17C42A-16E/PQ offers 33 I/O lines in a compact 44-MQFP package that fits behind-door and dashboard cavities. The 4 KB OTP capacity handles lookup tables for switch debouncing, PWM fan-control ramps, and LIN-simplified body-network routines, with the 16 MHz clock providing comfortable timing margin for 10 ms task scheduling. While automotive AEC-Q100 grade requires the /Q-spec variants, the industrial -40 to +125 C qualification of the 'E' suffix supports non-safety-critical interior and accessory modules common in 1990s-2000s vehicle platforms still in production or refurbishment cycles.
Recomendado
Consumer Electronics and Appliance Controllers
The PIC17C42A-16E/PQ fits cost-sensitive consumer appliance controllers (washing machines, microwave ovens, robotic vacuums, air purifiers) where the 4 KB OTP memory holds state-machine firmware, the 8-bit ADC reads NTC thermistors and motor-current shunts, and the USART interfaces to LED-display drivers or Bluetooth/Wi-Fi modules. The 16 MHz performance comfortably handles sensor fusion and HMI scrolling, while the wide 4.5V-6V VDD range matches mains-rectified DC rails commonly derived inside appliance SMPS without additional regulation. The 44-MQFP package is well-established for high-volume consumer production lines, enabling manufacturers to maintain existing SMT tooling when PIC17C42A supply must continue into late-life product cycles.
Recomendado
Motor Control Subsystems
In brushless-DC, brushed-DC, and stepper motor drive boards for pumps, fans, and small appliances, the PIC17C42A-16E/PQ implements field-oriented-control (FOC) outer loops or trapezoidal commutation with its 16 MHz/8.25 MIPS throughput and 8-level hardware stack supporting nested interrupt service routines for Hall-sensor feedback. The 33 I/O lines drive high-side/low-side gate-driver enable signals and PWM channels, while the on-chip 8-bit ADC reads back-current shunt amplifiers and bus-voltage telemetry for closed-loop regulation. The 232-byte RAM and 4 KB OTP host classic PI/D control tables and decel-ramp state machines, with the 44-MQFP footprint providing excellent thermal dissipation paths for industrial-grade motor-drive boards.
Recomendado
Medical Instrumentation (Legacy Maintenance)
For legacy medical devices such as bedside patient monitors, infusion pumps, and diagnostic analyzers that were originally designed around the PIC17C42A platform, the PIC17C42A-16E/PQ provides form-fit-function replacement under regulated product-maintenance programs. The 8-bit ADC and 33 I/O support front-panel switch-scan, alarm-relay output, and isolated serial-port telemetry, while the OTP memory locks the validated firmware - often a regulatory requirement for FDA 510(k) cleared devices. Engineering teams must verify medical-device revision-control change-out before any PIC17C42A replacement, since the new-production finite inventory is governed by part-identical replacement protocols in regulated service manuals.
Recomendado
Security and Alarm Panels
In commercial and industrial security alarm panels (intrusion detectors, access controllers, fire-alarm annunciators), the PIC17C42A-16E/PQ delivers the 16 MHz throughput needed to scan multi-zone sensor loops while driving LED/LCD keypads and relay-output alarm buses. The on-chip USART (SCI/SPI mode-selectable) interfaces to digital-communicator modems for central-station reporting, while the watchdog timer with on-chip RC oscillator provides fail-safe recovery from firmware faults that would otherwise lock the panel out of compliance. The OTP code-protection bit locks the firmware from external programmer readback, securing the alarm-system encryption keys and PIN-validation routines integral to UL-listed security installations.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para PIC17C42A-16E/PQ — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | PIC17C42A-16/PQ | PIC17C42A-16I/PQ | PIC17C42AT-16E/PQ | PIC17C42A-16E/P | PIC18F4220-I/PQ |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-MQFP (10x10) | 44-MQFP (10x10) - same | 44-MQFP (10x10) - same | 44-MQFP (10x10) - same | 40-DIP (different - not drop-in on MQFP footprint) | 44-MQFP (10x10) - same footprint (pin-to-pin migration) |
| Program Memory | 4 KB OTP | 4 KB OTP | 4 KB OTP | 4 KB OTP | 4 KB OTP | 16 KB flash (4x larger, re-programmable) |
| RAM Size | 232 x 8 bytes | 232 x 8 bytes | 232 x 8 bytes | 232 x 8 bytes | 232 x 8 bytes | 512 bytes (~2x) |
| Maximum Clock | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 40 MHz (PIC18 architecture, 2.5x faster) |
| Operating Temperature | -40 C to +125 C (industrial 'E') | 0 C to +70 C (commercial) | -40 C to +85 C (industrial 'I') | -40 C to +125 C (industrial 'E') | -40 C to +125 C (industrial 'E') | -40 C to +85 C (PIC18 'I' grade) |
| Memory Type | OTP (one-time programmable) | OTP | OTP | OTP | OTP | Flash (re-programmable, in-circuit) |
| Supply Voltage | 4.5V to 6V | 4.5V to 6V | 4.5V to 6V | 4.5V to 6V | 4.5V to 6V | 2.0V to 5.5V (wider, 3.3V compatible) |
| Lifecycle Status | Last-time-buy (EOL) | Last-time-buy (EOL) | Last-time-buy (EOL) | Last-time-buy (EOL) | Last-time-buy (EOL) | Active (recommended migration) |
Diferenciadores clave
- Wider industrial temperature range -40 to +125 C versus commercial-grade PIC17C42A-16/PQ (frente a PIC17C42A-16/PQ)
- Recommended modern migration target with flash memory, wider VDD, and active production (frente a PIC18F4220-I/PQ)
- Matched 44-MQFP footprint for direct PCB retention during obsolescence-driven redesign (frente a PIC17C42A-16E/P (40-DIP))
Notas de diseño
The PIC17C42A-16E/PQ operates from a single 4.5V to 6V VDD rail. Per the Microchip datasheet 30412E, place a 0.1 uF ceramic decoupling capacitor adjacent to each VDD/VSS pin pair (pins 11, 30 are VSS; pin 33 is VDD on the 44-MQFP package), and add a bulk 10 uF tantalum or aluminum capacitor on the same rail close to the MCU to suppress transient currents during EPROM programming and high-rate I/O switching. The /MCLR reset pin (pin 1) requires a 10 kohm pull-up to VDD and a 100 nF cap to ground to ensure clean power-on-reset behavior - omitting the cap can cause spurious resets during VDD ramp-up.
The 44-MQFP (10x10 mm) package has a typical theta_JA around 60 C/W in still air per Microchip package thermal data. At -40 C to +125 C industrial operation, ensure copper-pour thermal relief extends at least 25 mm^2 under the package on top and bottom PCB layers to keep junction temperature below the 150 C absolute maximum. In enclosed industrial cabinets without forced airflow, derate VDD to 5.0V-5.5V to limit I/O switching current-induced self-heating. For applications approaching the +125 C ambient limit, attach a small clip-on heatsink or thermal-via array directly under the exposed pad region.
Estimated: the 44-MQFP package has 0.8 mm lead pitch and 0.15 mm lead width, requiring a precise reflow profile with a peak temperature of 245-260 C for SAC305 lead-free solder. Per IPC-7351 guidelines, the recommended land pattern is rectangular pads 0.30 mm x 1.50 mm with solder-mask defined openings 0.20 mm x 1.30 mm to minimize tombstoning. Add a 0.5 mm-wide copper trace from pin 1 (/MCLR) pull-up resistor to a noise-free VDD rail, and keep oscillator traces (pin 12 OSC1, pin 13 OSC2) under 10 mm total length with a guard ground trace on each side for EMI immunity.
Common pitfalls for PIC17C42A-16E/PQ designs include: (1) assuming the device can be re-programmed like flash MCUs - OTP memory locks after first programming; (2) using a 3.3V supply which is below the 4.5V minimum and will cause brown-out resets; (3) leaving the /MCLR pin floating instead of tying through a 10 kohm pull-up, causing unpredictable reset behavior; (4) configuring the ADC with VDD as Vref+ when VDD is noisy, causing inaccurate sensor readings - use a dedicated MCP1541 4.096V reference; (5) attempting ICSP in-circuit programming without configuring the RB6/RB7 pins as high-impedance with the appropriate PGM control bits set, causing programming failures.
For USART SPI-mode clock rates above 2 MHz on the PIC17C42A-16E/PQ, add 33 ohm series termination resistors on the RC6 (CK) and RC7 (DT) lines near the MCU to dampen reflections and reduce EMI on long PCB traces. Per Microchip application note TB0877, the 16 MHz oscillator driving the internal 4x PLL produces sharp-edge transitions on CLKOUT that radiate harmonics near 64 MHz - keep CLKOUT trace lengths under 25 mm and surround with continuous ground plane. The analog comparator inputs on PORTE require a 100 ohm series resistor and 100 pF capacitor to ground for EMI filtering when reading noisy sensor signals.
Información de cumplimiento
RoHS compliant per Microchip product page. AEC-Q100 qualification is not available for the industrial-grade PIC17C42A-16E/PQ - automotive AEC-Q100 designs must select a separately qualified /Q suffix variant (consult factory). Halogen-free status was not explicitly stated in verified web data and is set to unknown. Last-time-buy status means the part is currently in finite production; long-term supply continuity is not guaranteed by Microchip.
