PIC16HV540/JW - 8-bit 20MHz MCU, 768B EPROM, On-chip Voltage Regulator | Microchip
MPN: PIC16HV540/JW ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $11.5 | $11.50 |
| 10 | $10.35 | $103.50 |
| 100 | $9.2 | $920.00 |
| 500 | $8.05 | $4,025.00 |
| 1,000 | $6.9 | $6,900.00 |
PIC16HV540/JW Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/EPROM/Flash), working RAM, and programmable I/O into one package, allowing it to directly read sensors and drive actuators without external glue logic. The PIC16HV540 belongs to the PIC16C5X family lineage - 12-bit-wide instructions that compress 2:1 versus typical 8-bit MCUs, with only 33 single-word instructions, all single-cycle (200 ns at 20 MHz). On-chip peripherals include a watchdog timer, power-on reset, and a precision internal RC oscillator for reduced BOM cost.
Key features: 25 ns instruction cycle at 20 MHz oscillator, 12-bit instruction word, 8-bit data path, 25 bytes of general-purpose RAM, 12 I/O pins with high-current sink/source capability (25 mA per pin, 100 mA total), on-chip voltage regulator accepting 3.5 V to 15 V, and a hardware watchdog timer for unattended operation. The part is pin- and software-compatible with the PIC16C54 baseline, simplifying migration from PIC16C5X code. UV-erase capability allows >100 erase/program cycles during development.
The PIC16HV540's distinctive architecture blends RISC-style orthogonal 12-bit instructions with a one-accumulator Harvard memory model, where program and data buses are physically separate, eliminating fetch bottleneck. The on-chip high-voltage shunt regulator accepts wide-input rails and clamps the internal logic supply to a safe 5 V level, which is what gives the "HV" prefix its name. The UV-erase window enables long-term code evolution without tooling changes.
Typical applications include embedded control with battery stacks (3-cell to 12-cell stacks fed directly), automotive body controllers (pre-CAN era), HVAC actuator drivers, security panels, white-goods controllers, industrial timer/counter modules, and remote sensor interfaces. The high-current I/O allows direct LED and relay drive without buffers.
When designing with PIC16HV540/JW, ensure the VDD pin sees only the regulated internal rail while VIN feeds the shunt regulator directly. Decouple both pins locally with 100 nF ceramics. The windowed CERDIP package is bulkier than plastic OTP/SOIC variants but is the only option if UV erasure and reprogramming is required.
Drop-in alternatives for PIC16HV540/JW — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC16HV540/JW (same form factor and footprint) — differing in Package, Core Architecture, Program Memory Size, Program Memory Type, On-chip Voltage Regulator.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16HV540-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16HV540-04/JW
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16HV540-04/P
✅ Drop-In✓ In Stock
$2.62 / Unit
View Datasheet →PIC16HV540-04I/SO
✅ Drop-In✓ In Stock
$1.78 / Unit
View Datasheet →PIC16HV540-04/SS
✅ Drop-In✓ In Stock
$2.45 / Unit
View Datasheet →PIC16HV540T-04I/SO
✅ Drop-In✓ In Stock
$1.78 / Unit
View Datasheet →PIC16HV540/JW Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 16C - 8-bit |
| Program Memory Type | EPROM (UV-erasable) |
| Program Memory Size | 768 bytes (512 x 12 bits) |
| RAM Size | 25 bytes |
| Maximum CPU Frequency | 20 MHz |
| Instruction Cycle Time | 200 ns (single cycle, 4 clock periods) |
| Instruction Set Size | 33 single-word instructions, 12-bit opcode |
| On-chip Voltage Regulator | Yes - high-voltage shunt regulator, 3.5 V to 15 V input |
| I/O Pins | 12 |
| I/O Sink/Source Current | 25 mA per pin, 100 mA total package |
| Timer Modules | Watchdog Timer (WDT), RTCC |
| Oscillator | Internal RC or external crystal/RC |
| Package | 18-pin CERDIP with UV window (JW) |
| Operating Temperature | 0C to +70C (commercial) |
| Pin Compatible With | PIC16C54 baseline |
| Erase Method | UV (quartz window on JW package) |
| RoHS Status | Compliant |
PIC16HV540/JW Pin Configuration
| Pin 1 | RA2 — Bidirectional I/O port A bit 2 |
| Pin 2 | RA3 — Bidirectional I/O port A bit 3 |
| Pin 3 | RTCC — Real-Time Clock/Counter external input |
| Pin 4 | MCLR — Master Clear reset input (active low) |
| Pin 5 | VSS — Logic ground |
| Pin 6 | RB0 — Bidirectional I/O port B bit 0 |
| Pin 7 | RB1 — Bidirectional I/O port B bit 1 |
| Pin 8 | RB2 — Bidirectional I/O port B bit 2 |
| Pin 9 | RB3 — Bidirectional I/O port B bit 3 |
| Pin 10 | RB4 — Bidirectional I/O port B bit 4 |
| Pin 11 | RB5 — Bidirectional I/O port B bit 5 |
| Pin 12 | RB6 — Bidirectional I/O port B bit 6 |
| Pin 13 | RB7 — Bidirectional I/O port B bit 7 |
| Pin 14 | VDD — High-voltage regulated supply input (3.5-15V) |
| Pin 15 | OSC2 — Oscillator output / RC connection |
| Pin 16 | OSC1 — Oscillator input / RC connection / external clock |
| Pin 17 | RA0 — Bidirectional I/O port A bit 0 |
| Pin 18 | RA1 — Bidirectional I/O port A bit 1 |
Typical Applications
PIC16HV540/JW is suitable for 7 applications: Direct Battery-Stack Embedded Control, Automotive Body Controller (Pre-CAN Era), HVAC Actuator Driver, Industrial Timer / Counter Module, Security and Alarm Panel, White-Goods Appliance Controller, Remote Sensor Interface Node.
Direct Battery-Stack Embedded Control
The PIC16HV540/JW's on-chip 3.5-15 V high-voltage shunt regulator eliminates the need for an external 5V LDO when running from battery stacks. In a typical 9V or 12V battery application the HV input pin accepts the raw rail while the internal regulator clamps logic to 5V. Per Microchip datasheet 40197b, the HV input tolerates up to 15V continuously, and the 8-bit RISC core delivers 5 MIPS at 20 MHz, ample for sensor reading and actuator PWM. The 12 I/O pins with 25 mA drive directly switch small relays and LEDs. The windowed CERDIP package enables code iteration during prototype development of battery-powered HVAC or remote-sensor products.
Recommended
Automotive Body Controller (Pre-CAN Era)
The PIC16HV540/JW's wide input voltage range (3.5-15 V) tolerates automotive 12V bus transients, while the 20 MHz core provides 5 MIPS for body-control timing loops. In automotive body modules such as central locking, mirror control, and lighting sequencers, the 25 mA I/O directly drives small solenoids and lamp filaments. The on-chip watchdog timer ensures unattended recovery from bus noise. The 8-bit 12-bit-instruction architecture is mature and well-characterized in automotive qualification workflows that predate CAN-bus adoption. Migration to PIC16F1X K-series is recommended for new designs.
Recommended
HVAC Actuator Driver
The PIC16HV540/JW drives HVAC damper motors and valve actuators from 24 VAC rectified supplies through its HV-tolerant input. The 12 I/O pins operate the damper stepper or proportional valve feedback loop, while the RTCC timer schedules the duty cycle for energy-saving setback logic. The 20 MHz instruction throughput executes PID-style control loops in 200 ns cycles, leaving CPU headroom for the watchdog and sensor sampling. The windowed CERDIP package suits field-repairable HVAC controller modules; the on-chip RC oscillator saves BOM cost versus a crystal reference.
Recommended
Industrial Timer / Counter Module
The PIC16HV540/JW excels at industrial timer-counter applications where the on-chip RTCC handles 16-bit event counting and the watchdog timer recovers from mains glitches. Powered directly from 24 VDC or rectified 24 VAC through the HV regulator pin, it eliminates auxiliary power rails. The 768-byte EPROM stores machine-tool sequence programs, and the 33-instruction RISC core simplifies ladder-style logic translation. The 25 mA I/O directly interfaces 24 V optocouplers; for higher voltages a discrete transistor driver scales the output.
Recommended
Security and Alarm Panel
The PIC16HV540/JW is well-suited to security panels running from backup battery stacks (typically 6V-12V sealed lead-acid) where the HV regulator accepts the raw battery rail. The watchdog timer detects firmware hangs and resets the panel for unattended operation, while the 12 high-current I/O drive piezo sirens, LED indicators, and relay outputs for sirens and dialers. The UV-erasable JW package supports firmware update workflows that iterate with new sensor protocols. The 8-bit core executes sensor-debounce and zone-arm/disarm state machines in real time at 20 MHz.
Recommended
White-Goods Appliance Controller
White-goods controllers (washers, dishwashers, microwave ovens) often run from rectified mains-derived DC rails (12-15 V), and the PIC16HV540/JW's on-chip HV regulator simplifies the power tree. The 20 MHz core schedules motor speed, water-level, and temperature-sensing tasks while driving triac-gate optocouplers through the 25 mA I/O pins. The 768-byte EPROM stores cycle profiles and the on-chip RC oscillator saves the BOM cost of an external resonator. The windowed package supports engineering rebuilds during prototyping; production uses PIC16HV540-I/P OTP.
Recommended
Remote Sensor Interface Node
In remote sensor nodes powered by 9V batteries or solar-charged 12V lead-acid packs, the PIC16HV540/JW's on-chip HV regulator eliminates a separate LDO stage, reducing quiescent current and component count. The 8-bit core reads temperature, humidity, or 4-20 mA loop sensors through ADC-free comparator inputs and frames the data for an external modem or radio. The RTCC timer and watchdog handle wake/sleep and unattended-recovery. Migration to PIC16F1X is recommended for new ultra-low-power wireless sensor designs.
Recommended
Recommended Products Summary
Engineering reference data for PIC16HV540/JW — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16HV540-I/P | PIC16HV540-04/JW | PIC16HV540-04/P |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-pin CERDIP (JW window) | 18-pin PDIP | 18-pin CERDIP (JW window) | 18-pin PDIP |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 4 MHz | 4 MHz |
| Program Memory | 768 B EPROM, UV-erasable | 768 B EPROM, OTP (one-time-programmable) | 768 B EPROM, UV-erasable | 768 B EPROM, OTP |
| On-chip HV Voltage Regulator | Yes (3.5-15V shunt) | Yes (3.5-15V shunt) | Yes (3.5-15V shunt) | Yes (3.5-15V shunt) |
| I/O Pins | 12 (25 mA each) | 12 (25 mA each) | 12 (25 mA each) | 12 (25 mA each) |
| UV Erasable Window | Yes (CERDIP with window) | No (plastic DIP) | Yes (CERDIP with window) | No (plastic DIP) |
| Operating Temperature | 0C to +70C (commercial) | -40C to +85C (industrial) | 0C to +70C (commercial) | 0C to +70C (commercial) |
Key Differentiators
- On-chip high-voltage shunt regulator (vs PIC16C54 baseline)
- UV-erasable window for code iteration (vs PIC16HV540-I/P OTP)
- 20 MHz speed grade with full 5 MIPS throughput (vs PIC16HV540-04/JW (4 MHz speed grade))
Design Notes
The PIC16HV540's VDD pin is the HV shunt regulator input - tie it directly to the battery or DC rail (3.5 V to 15 V) without an external LDO. Per the datasheet 40197b, the on-chip shunt clamps the internal logic rail to ~5 V; do NOT add a series resistor on VDD, and decouple VDD with a 100 nF ceramic placed within 5 mm of the pin. VSS is the logic ground and the shunt regulator return; use a low-impedance ground pour to dissipate shunt current at high VIN.
Estimated: At VIN = 15 V with 5 mA internal logic current, the on-chip shunt dissipates approximately (15 V - 5 V) * 5 mA = 50 mW continuously. With theta_JA near 70 C/W for CERDIP-18, junction temperature rises ~3.5 C above ambient - well within limits. However, if external loads are switched by I/O pins sourcing from VDD, additional shunt current may flow; derate VIN to 12 V for reliability margin in enclosed housings.
Place the 100 nF VDD bypass capacitor as close as possible to pin 14 with a short ground return to pin 5. If using an external crystal or resonator on OSC1/OSC2 (pins 16/15), keep traces short and away from RTCC traces to minimize coupling. The MCLR pin (pin 4) requires a 10-50 kohm pull-up to VDD; do not leave it floating, as the device will not start reliably without it. The windowed JW package must be socketed or finger-saved if UV erasure cycles are anticipated.
Common pitfalls: (1) Mistaking PIC16HV540 for PIC16C540 - the HV prefix is critical and the PIC16C540 lacks the on-chip regulator. (2) Assuming Flash-like in-circuit programming - PIC16HV540 requires a high-voltage (12-14V) parallel programmer. (3) Forgetting MCLR pull-up - device will not exit reset. (4) Confusing VDD (HV input) with a regulated 5 V output - the VDD pin is an INPUT, not an output rail for other ICs. (5) Driving RB0-RB7 with >25 mA without external buffers.
Compliance Information
RoHS and REACH compliant per Microchip product page. The PIC16HV540 family is not AEC-Q100 qualified; for automotive designs requiring Q100, migrate to a PIC16F1X K-series part. CERDIP package contains lead-free solder but the ceramic body itself contains trace lead in the glass frit, exempt under RoHS Annex III 7(c).
