PIC14000/JW - 8-Bit 4MHz Mixed-Signal MCU, 7KB EPROM, 28-CerDIP
MPN: PIC14000/JW β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $38.5 | $38.50 |
| 10 | $34.2 | $342.00 |
| 100 | $30.1 | $3,010.00 |
| 500 | $26.85 | $13,425.00 |
| 1,000 | $24.5 | $24,500.00 |
PIC14000/JW Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripheral interfaces on one die. The PIC family of microcontrollers uses a Harvard architecture RISC core, where program and data memories are physically separate, enabling faster instruction fetch and deterministic execution. The PIC14 sub-family is a programmable mixed-signal line that adds analog peripherals (slope A/D, bandgap reference, programmable current source, LVD, voltage regulator control output) to the standard digital PIC core, making it suitable for sensor signal conditioning and closed-loop control.
Key features of the PIC14000/JW include an 8-channel slope A/D converter for low-frequency analog measurement, a 4-bit programmable current source for sensor excitation, an internal oscillator, an on-chip temperature sensor, a bandgap voltage reference, a Low-Voltage Detector (LVD), and a voltage regulator control output. The device supports 6 internal interrupts and 5 external interrupts, and operates from 4.5V to 5.5V across the commercial temperature range.
The JW suffix indicates a windowed ceramic package, which allows UV erasure for development and reprogramming of the EPROM. Compared with OTP and Flash variants, the JW package is intended for prototyping, education, and low-volume engineering use where program memory must be repeatedly re-written.
Typical applications include industrial sensor signal conditioning, battery charging controllers, closed-loop fan/thermostat control, and mixed-signal front-ends for instrumentation. The device is also widely used in engineering education because the JW windowed package supports repeated erase/program cycles for code experimentation.
When designing with the PIC14000/JW, note that the ceramic DIP package is through-hole only, and the EPROM window must be covered during operation to prevent accidental UV erasure from ambient light. Program memory is limited to 4K words of 14-bit instructions, so code must be optimized for footprint.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer product page alone.
Drop-in alternatives for PIC14000/JW β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
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PIC14000/JW Maximum Ratings & Electrical Characteristics
| Core | PIC14 8-bit RISC |
| Instruction Set Size | 35 single-word instructions |
| Instruction Execution Time | 200 ns |
| Maximum Clock Speed | 20 MHz clock input (4 MHz typical) |
| Program Memory Type | UV EPROM (windowed) |
| Program Memory Size | 7 KB (4K x 14) |
| Data RAM | 192 x 8 bytes |
| I/O Pins | 20 |
| Internal Interrupts | 6 |
| External Interrupts | 5 |
| A/D Converter | Slope (Sigma-Delta) type, on-chip |
| Programmable Current Source | 4-bit, on-chip |
| Voltage Reference | Bandgap, on-chip |
| Temperature Sensor | On-chip |
| Low Voltage Detector (LVD) | Yes |
| Voltage Regulator Control Output | Yes |
| Supply Voltage | 4.5 V to 5.5 V |
| Package | 28-pin CerDIP (windowed) - through-hole |
PIC14000/JW Pin Configuration
| Pin 1 | VSS β Ground reference |
| Pin 2 | OSC1 β Oscillator input / external clock |
| Pin 3 | OSC2 β Oscillator output |
| Pin 4 | RESET β Reset input (active low) |
| Pin 5 | RA0 β Port A bit 0 / analog input |
| Pin 6 | RA1 β Port A bit 1 / analog input |
| Pin 7 | RA2 β Port A bit 2 / analog input |
| Pin 8 | RA3 β Port A bit 3 / analog input |
| Pin 9 | RA4 β Port A bit 4 / analog input |
| Pin 10 | RA5 β Port A bit 5 / analog input |
| Pin 11 | RC0 β Port C bit 0 |
| Pin 12 | RC1 β Port C bit 1 |
| Pin 13 | RC2 β Port C bit 2 |
| Pin 14 | RC3 β Port C bit 3 |
| Pin 15 | RC4 β Port C bit 4 |
| Pin 16 | RC5 β Port C bit 5 |
| Pin 17 | RC6 β Port C bit 6 |
| Pin 18 | RC7 β Port C bit 7 |
| Pin 19 | RB0 β Port B bit 0 / external interrupt |
| Pin 20 | RB1 β Port B bit 1 / external interrupt |
| Pin 21 | RB2 β Port B bit 2 / external interrupt |
| Pin 22 | RB3 β Port B bit 3 / external interrupt |
| Pin 23 | RB4 β Port B bit 4 / external interrupt |
| Pin 24 | RB5 β Port B bit 5 |
| Pin 25 | RB6 β Port B bit 6 |
| Pin 26 | RB7 β Port B bit 7 |
| Pin 27 | VREG β Voltage regulator control output |
| Pin 28 | VDD β Positive supply (4.5V to 5.5V) |
Typical Applications
PIC14000/JW is suitable for 6 applications: Industrial Sensor Signal Conditioning, Closed-Loop Fan / Thermostat Control, Battery Charging Controllers, Mixed-Signal Instrumentation Front-End, Engineering Education and Training, Slope A/D Calibration Reference.
Industrial Sensor Signal Conditioning
The PIC14000/JW's on-chip slope A/D converter and 4-bit programmable current source make it ideal for sensor excitation and signal conditioning front-ends. The slope A/D achieves high resolution for low-frequency transducer signals (RTDs, thermocouples, bridge sensors), while the programmable current source provides configurable sensor excitation without external analog circuitry. With 20 I/O pins and 192 bytes RAM, the device can handle multi-channel sensor scanning and digital filtering. Compared to a discrete op-amp + SAR ADC approach, the PIC14000/JW integrates excitation, conversion, and digital control into one chip, reducing BOM and PCB area for industrial sensor modules. Operating from 4.5-5.5V aligns with industrial 5V supply rails.
Recommended
Closed-Loop Fan / Thermostat Control
The PIC14000/JW is well suited for closed-loop thermal control in HVAC and PC cooling applications. Its on-chip temperature sensor provides internal die temperature monitoring, while the slope A/D can read an external thermistor or RTD with adequate resolution for proportional control. The voltage regulator control output enables direct drive of an external pass transistor for fan speed regulation. With 200 ns instruction execution and 35 instructions, the PIC14 core easily handles PID control loops at sample rates above 1 kHz. The 5 external interrupts also support tachometer input from fan Hall sensors for closed RPM feedback in 4-wire PWM fan designs.
Recommended
Battery Charging Controllers
The PIC14000/JW's on-chip bandgap voltage reference, programmable current source, and LVD (Low Voltage Detector) make it a natural fit for linear battery charger control designs. The current source can be programmed to deliver a configurable constant-charge current to a NiCd/NiMH battery pack, while the bandgap reference sets the termination voltage threshold. The LVD monitors battery voltage and triggers charge cutoff. With 5V operation, the device can manage 1-4 cell NiMH packs via external pass transistor. Compared to a dedicated charger IC, the PIC14000/JW allows custom charge algorithms (pulse charging, negative delta-V detection) programmed in firmware, valuable for specialty battery chemistries.
Recommended
Mixed-Signal Instrumentation Front-End
Engineers building mixed-signal data acquisition front-ends can leverage the PIC14000/JW's slope A/D for high-resolution low-frequency measurement of strain gauges, pressure sensors, and weighing scales. The slope converter provides intrinsic noise shaping that improves effective resolution beyond the basic 14-bit word width for slowly varying signals. The on-chip bandgap reference provides a stable 1.2V reference for ratiometric measurements against bridge sensors. The 28-pin CerDIP package is convenient for prototyping laboratory instrumentation where UV erasure allows iterative firmware tuning during calibration.
Recommended
Engineering Education and Training
The PIC14000/JW's windowed CerDIP package allows repeated UV erasure and reprogramming, making it a popular choice for embedded systems and microcontroller education. Students can write and test code, erase via UV lamp, and reprogram thousands of times - a key advantage over OTP or one-time-programmable parts. The PIC14 RISC core with only 35 instructions is also pedagogically simple for assembly language instruction. The mixed-signal peripherals (slope A/D, current source, bandgap) expose students to analog/digital integration concepts in a single inexpensive package, supporting curricula covering embedded C, assembly, mixed-signal design, and sensor interfacing.
Recommended
Slope A/D Calibration Reference
Designers can use the PIC14000/JW as a known reference design for slope A/D conversion techniques in mixed-signal MCU development. Studying its on-chip sigma-delta-style integrator and comparator helps engineers understand how oversampling and integration achieve high effective resolution for low-frequency signals. The 4-bit programmable current source is also useful as a calibration reference for external current-output sensors (4-20 mA loops). Combined with 7KB EPROM and 192 bytes RAM, the device can serve as a slave processor in larger systems that need a localized mixed-signal front-end communicating via SPI or I2C to a host controller.
Recommended
Recommended Products Summary
Engineering reference data for PIC14000/JW β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F1765-I/P | PIC16F1769-I/P | PIC16F1783-I/P | PIC16F1847-I/P |
|---|---|---|---|---|---|
| Package | 28-pin CerDIP (windowed) | 28-pin PDIP | 28-pin PDIP | 28-pin PDIP | 28-pin PDIP |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core Architecture | PIC14 8-bit RISC | PIC16 enhanced mid-range 8-bit | PIC16 enhanced mid-range 8-bit | PIC16 enhanced mid-range 8-bit | PIC16 enhanced mid-range 8-bit |
| Program Memory | 7 KB (4K x 14) UV-EPROM | 14 KB Flash | 14 KB Flash | 8 KB Flash | 8 KB Flash |
| Memory Type | UV-EPROM (windowed) | Flash | Flash | Flash | Flash |
| ADC Type | Slope (Sigma-Delta style) | 10-bit SAR + slope option | 10-bit SAR + slope option | 12-bit SAR | 12-bit SAR |
| Maximum Clock Speed | 4 MHz (20 MHz oscillator input) | 32 MHz internal | 32 MHz internal | 32 MHz internal | 32 MHz internal |
| I/O Pins | 20 | 24 | 24 | 24 | 25 |
| Lifecycle Status | Obsolete | Active | Active | Active | Active |
Key Differentiators
- On-chip programmable current source eliminates external excitation circuitry (vs PIC16F1765-I/P)
- UV-erasable windowed package supports iterative development (vs PIC16F1765-I/P)
- Integrated mixed-signal peripherals (slope A/D + bandgap + current source + LVD) (vs PIC16F1765-I/P)
Design Notes
The JW windowed CerDIP package exposes the silicon die to UV light for EPROM erasure. Cover the window with opaque tape during normal operation to prevent accidental program loss from ambient UV (sunlight, fluorescent lamps, welding arcs). An uncovered window can erase program memory in days to weeks depending on ambient UV intensity, leading to unexplained firmware corruption.
The PIC14000/JW operates from a single 4.5V-5.5V supply; the on-chip voltage regulator control output (VREG pin) is intended to drive an external pass transistor for auxiliary rail generation. Place a 100 nF decoupling capacitor directly between VDD (pin 28) and VSS (pin 1) as close to the package as possible, and add a bulk 10 uF tantalum or aluminum electrolytic capacitor at the board input.
The slope A/D converter is sensitive to digital switching noise on VDD. Route the AVDD/AVSS (analog supply) pins with separate traces from VDD/VSS if available, or place the MCU's VDD pin close to a quiet 5V rail. Keep digital I/O traces away from the analog input pins and the current source output to minimize crosstalk into the slope integrator. Use a ground plane under the MCU for stable measurements.
The on-chip slope A/D achieves best effective resolution at low input bandwidth. For accurate measurements, average multiple conversions in firmware or oversample at a fixed rate. Avoid using the slope A/D for rapidly changing signals above 100 Hz - use a successive-approximation ADC instead. The 4-bit programmable current source output should be filtered with a small RC network (e.g., 10 kohm + 100 nF) for stable sensor excitation.
Compliance Information
CerDIP windowed package typically contains lead-based ceramic-glass seals and is generally not RoHS compliant. The plastic PDIP Flash alternatives (PIC16F1765-I/P etc.) are RoHS compliant. AEC-Q100 automotive qualification not applicable to the JW development part.
