PIC16HV540T-04I/SO - 8-Bit 4MHz OTP MCU 18-SOIC | Microchip
MPN: PIC16HV540T-04I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.86 | $28.60 |
| 100 | $2.41 | $241.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.78 | $1,780.00 |
PIC16HV540T-04I/SO Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral I/O on one die. The PIC16C family uses a Harvard architecture with 12-bit-wide instructions and 33 single-word opcodes, achieving approximately 2:1 code compression versus competing 8-bit MCUs in its class. The on-chip shunt regulator places the PIC16HV540 into the power-management-aware microcontroller category, suitable for direct battery or unregulated bus operation.
Key differentiating features of the PIC16HV540T-04I/SO include the integrated high-voltage shunt regulator (eliminating external regulator cost), 12 bidirectional I/O pins with high-current sink capability, a Watchdog Timer with dedicated on-chip RC oscillator, Power-on Reset, and an industrial operating temperature range of -40C to +85C. The 33-instruction RISC-like instruction set enables deterministic single-cycle execution except for program branches, simplifying real-time control firmware development.
Architecturally, the PIC16HV540 combines a 4 MHz internal instruction clock with two hardware interrupt sources (external INT pin and timer overflow), an 8-bit real-time clock/counter with 8-bit prescaler, and a CONFIG word for oscillator, watchdog, code-protect, and timer mode selection. OTP program memory supports low-volume production runs, while the integrated shunt regulator simplifies power-tree design in cost-sensitive embedded systems.
Typical applications include industrial control logic, automotive body electronics, low-cost consumer appliance controllers, battery-powered sensor nodes, and replacement of legacy PIC16C5x designs. Designers select this part when unregulated 12V or battery power is available and bill-of-material cost is critical.
A key design consideration is that OTP memory cannot be re-programmed; for prototyping, prefer the windowed JW package. The shunt regulator dissipates excess voltage as heat - at 15V input and 5V Vdd load, thermal management of the SOIC package must be verified.
This page synthesizes XAIPART distributor pricing, same-family pin-compatible Microchip variants, drop-in cross-references, and practical design notes not consolidated on the manufacturer datasheet, giving engineers a single decision-ready reference.
Drop-in alternatives for PIC16HV540T-04I/SO — 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 PIC16HV540T-04I/SO (same form factor and footprint) — differing in Core Architecture, Operating Temperature, On-chip Voltage Regulator, Program Memory Size, Program Memory Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16HV540-04I/SO
✅ Drop-In✓ In Stock
$1.78 / Unit
View Datasheet →PIC16HV540T-04/SO
✅ Drop-In✓ In Stock
$1.2 / Unit
View Datasheet →PIC16HV540-20I/SO
✅ Drop-In✓ In Stock
$1.39 / Unit
View Datasheet →PIC16HV540T-04I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16C5x (Harvard, 8-bit) |
| Instruction Set Width | 12-bit |
| Program Memory (ROM) | 768 bytes (512 x 12) OTP EPROM |
| Data RAM | 25 bytes |
| Maximum Clock Speed | 4 MHz |
| Supply Voltage (Vdd) | 3.5 V to 15 V (via internal shunt regulator) |
| I/O Pins | 12 bidirectional |
| Timers | 1 x 8-bit Timer/Counter with 8-bit prescaler |
| Interrupts | 2 (external INT, Timer0 overflow) |
| Watchdog Timer | Yes, with dedicated on-chip RC oscillator |
| Power-on Reset | Yes |
| Instruction Count | 33 single-word instructions |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 18-pin SOIC (SO) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| MSL Level | 1 (unlimited) |
PIC16HV540T-04I/SO Pin Configuration
| Pin 1 | RA2 — Bidirectional I/O port A bit 2 |
| Pin 2 | RA3 — Bidirectional I/O port A bit 3 |
| Pin 3 | RA4/T0CKI — Bidirectional I/O / Timer0 clock input |
| Pin 4 | MCLR/Vpp — Master Clear (active low reset) / Programming voltage input |
| Pin 5 | Vss — Ground reference |
| Pin 6 | RB0/INT — Bidirectional I/O port B bit 0 / External interrupt |
| 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 — Positive supply (regulated internally by shunt regulator from VS) |
| Pin 15 | OSC2/CLKOUT — Oscillator output / Clock output (crystal mode) |
| Pin 16 | OSC1/CLKIN — Oscillator input / External clock input |
| Pin 17 | RA0 — Bidirectional I/O port A bit 0 |
| Pin 18 | RA1 — Bidirectional I/O port A bit 1 |
Typical Applications
PIC16HV540T-04I/SO is suitable for 6 applications: Industrial Control Logic, Automotive Body Electronics, Consumer Appliance Controllers, Battery-Powered Sensor Nodes, Replacement of Legacy PIC16C5x Designs, Hobbyist and Educational Embedded Projects.
Industrial Control Logic
The PIC16HV540T-04I/SO suits industrial control logic where 24V or 12V unregulated rails are common. Its on-chip shunt regulator accepts 3.5V to 15V directly, eliminating an external 5V LDO and saving BOM cost and PCB area in relay drivers, sensor interfaces, and simple state-machine controllers. The 4 MHz instruction rate and 33-instruction RISC set provide deterministic single-cycle execution, well-matched to 1-10 kHz control loops in motor starters, solenoid sequencers, and conveyor logic. Industrial temperature grade (-40C to +85C) and 18-SOIC surface-mount packaging support SMT assembly lines. The 12 GPIO pins comfortably drive LEDs, optocouplers, and low-side FETs directly.
Recommended
Automotive Body Electronics
Automotive body controllers - lighting sequencers, wiper timers, and accessory delay modules - operate from 12V vehicle rails that vary from 9V cranking transients to 16V load-dump. The PIC16HV540T-04I/SO shunt regulator absorbs this wide range internally, providing stable logic supply to the core. Its OTP memory and 768-byte program space suit fixed-function appliances shipped in production volumes where Flash reprogramming is unnecessary. The 8-bit timer with prescaler handles PWM for lamp dimming or buzzer tones. Note that AEC-Q100 qualification is not explicitly listed for this part; design teams should validate against their OEM automotive EMC/ESD requirements or select an AEC-Q100 part such as PIC16F15323-E/SL for new programs.
Recommended
Consumer Appliance Controllers
Cost-optimized consumer appliances - coffee makers, washing-machine sub-modules, microwave keypads, and small kitchen devices - demand the lowest BOM cost for control electronics. The PIC16HV540T-04I/SO drops directly onto an 18-SOIC PCB and integrates the voltage regulator, eliminating external linear regulator cost. OTP memory is acceptable for high-volume products where firmware is finalized before tooling. The 12 GPIO pins drive 7-segment displays, keypads, triac optos, and buzzer drivers without external mux. Industrial -40C to +85C rating covers the under-cabinet and garage environments typical for these appliances.
Recommended
Battery-Powered Sensor Nodes
Low-duty-cycle battery-powered sensor nodes benefit from the PIC16HV540T-04I/SO wide-supply 3.5V to 15V range, which accepts multi-cell battery packs (3x AA = 4.5V nominal, or 12V lantern batteries) without boost/buck conversion. The 33-instruction RISC core and single-cycle execution keep average current low when the MCU spends most of its time in sleep mode. The on-chip watchdog timer with dedicated RC oscillator adds robustness for unattended nodes. However, for designs needing sub-1 uA sleep current or analog sensor integration, the PIC16F1xxx family with nanoWatt XLP technology is a more modern alternative.
Recommended
Replacement of Legacy PIC16C5x Designs
Designs originally built around the PIC16C54, PIC16C55, PIC16C56, or PIC16C57 OTP microcontrollers can drop in the PIC16HV540T-04I/SO when the supply rail is in the 3.5-15V range and 768-byte program memory is sufficient. The PIC16HV540 shares the same 33-instruction 12-bit-wide core, 8-bit timer structure, and CONFIG word model as the PIC16C54 family, so existing assembly code typically ports without modification. The 18-SOIC mechanical outline matches PIC16C54-04/SO and PIC16C54-10/SO layouts. This makes it an attractive form-fit-function replacement for cost-down or end-of-life refresh projects on legacy 5V-or-greater designs.
Recommended
Hobbyist and Educational Embedded Projects
Students and hobbyists building PIC16 assembly tutorials or simple robotics projects benefit from the PIC16HV540T-04I/SO single-supply operation - they can power the board from a 9V battery or USB-9V adapter without a regulator stage. The 33-instruction core is small enough to master in a semester, and the 4 MHz instruction rate is fast enough for blinking LEDs, driving servos, and reading pushbuttons. However, because the part is OTP, hobbyists should consider PIC16F84, PIC16F628, or PIC16F877A Flash parts (all in the XAIPART catalog) for iterative development where firmware must be re-flashed multiple times during debugging.
Recommended
Recommended Products Summary
Engineering reference data for PIC16HV540T-04I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16HV540-04I/SO | PIC16HV540T-04/SO | PIC16HV540-20I/SO | PIC16HV540-04I/P |
|---|---|---|---|---|---|
| Package | 18-SOIC (SO) | 18-SOIC (SO) - same | 18-SOIC (SO) - same | 18-SOIC (SO) - same | 18-PDIP - NOT drop-in on SOIC PCB |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Speed | 4 MHz | 4 MHz | 4 MHz | 20 MHz | 4 MHz |
| Program Memory | 768 bytes OTP (512 x 12) | 768 bytes OTP | 768 bytes OTP | 768 bytes OTP | 768 bytes OTP |
| Data RAM | 25 bytes | 25 bytes | 25 bytes | 25 bytes | 25 bytes |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | 0C to +70C (Commercial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
| Supply Voltage | 3.5V to 15V (internal shunt regulator) | 3.5V to 15V | 3.5V to 15V | 3.5V to 15V | 3.5V to 15V |
| Packaging Media | Tape & Reel | Tube | Tape & Reel | Tube | Tube (PDIP) |
Key Differentiators
- On-chip 3.5-15V shunt regulator eliminates external 5V LDO (vs PIC16F84A-I/SO)
- Same-die drop-in with broader operating temperature (vs PIC16HV540T-04/SO)
- 5x higher throughput headroom on same 18-SOIC footprint (vs PIC16HV540-20I/SO)
Design Notes
The PIC16HV540T-04I/SO integrates a shunt regulator from the VS (high-voltage) supply pin to the internal Vdd rail. At 15V input and 5 mA Vdd load, the shunt dissipates approximately 50 mW - well within SOIC thermal limits. However, if the application draws significantly more than 10 mA from Vdd, the shunt's series resistor can heat; consider using a lower-voltage input rail or sourcing Vdd externally. According to Microchip datasheet 40197b, an external series resistor between VS and the supply sets the regulated Vdd current, sized to handle worst-case VIN and load combinations.
OTP memory cannot be re-programmed or re-tested. Code-protect (CP) bit in the CONFIG word must be set deliberately - if enabled prematurely, factory-side verification becomes impossible. For development cycles, use the PIC16HV540-04I/JW windowed CERDIP package which permits EPROM erasure with UV light, then migrate to the SOIC OTP version only after firmware is locked. Also note that the 12-bit program counter means conditional branches are 2 cycles; firmware timing analysis must account for this to meet real-time deadlines.
Place the 18-SOIC decoupling capacitor (typically 0.1 uF ceramic) within 5 mm of the Vdd pin (pin 14) and tie Vss (pin 5) directly to the ground plane with a via. For crystal oscillator modes (XT, HS), keep the crystal and its load capacitors within 5 mm of OSC1 (pin 16) and OSC2 (pin 15) to minimize stray capacitance. The MCLR/Vpp pin (pin 4) should have a 10 kohm pull-up to Vdd and a 100 nF cap to ground for noise immunity on electrically noisy industrial lines.
Compliance Information
RoHS and REACH compliance per Microchip product page and DigiKey listing. AEC-Q100 not explicitly qualified - not recommended for safety-critical automotive without further validation. Conflict-minerals compliant per Microchip corporate policy. Halogen-free status not specified in provided data.