PIC14000-04I/SO - 8-Bit 4MHz Mixed-Signal MCU | Microchip | 28-SOIC
MPN: PIC14000-04I/SO β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $13.54 | $13.54 |
| 10 | $12.18 | $121.80 |
| 100 | $10.83 | $1,083.00 |
| 500 | $9.55 | $4,775.00 |
| 1,000 | $8.3 | $8,300.00 |
PIC14000-04I/SO Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and programmable I/O peripherals onto one silicon die. PIC MCUs use a RISC-based Harvard architecture, which separates program and data memory paths to allow simultaneous instruction fetch and operand access. The PIC14xx family extends this architecture with on-chip analog peripherals such as an 8-bit ADC, voltage reference, comparators, and a switched-capacitor bandgap, making the PIC14000 specifically a 'mixed-signal controller' rather than a pure digital MCU.
Key features include 35 single-word instructions, all executing in a single cycle except program branches (which take two cycles), 200 ns instruction execution time at 20 MHz, 20 programmable digital I/O pins, 5 external interrupts, 6 internal interrupts, and an 8-bit ADC with 8 channels. The device supports multiple power-saving SLEEP modes and wakes via interrupt or reset. The 28-SOIC package provides 0.295 inch (7.50 mm) body width suitable for hand-soldering and reflow profiles in industrial designs.
The PIC14000 architecture combines a RISC core with integrated analog blocks: an 8-bit successive-approximation ADC, an on-chip voltage regulator, programmable gain stages, and charge-balancing measurement circuitry. This analog integration allows direct interface to sensors such as thermocouples and bridge-type transducers without external signal conditioning.
Typical applications include battery charging controllers, battery capacity monitoring, smart battery management, precision data logging, and standalone sensor signal conditioning. The device's combination of low-power SLEEP modes and on-chip analog makes it a fit for portable and energy-harvesting products where PCB area and BOM cost dominate.
When designing with this part, note that the PIC14000 is OTP (one-time programmable) and is marked by Microchip as 'Not Recommended for new designs' (NRND). For new designs, select PIC16F or PIC18 families. The /SO package is compatible with standard SOIC-28 footprints but requires careful thermal and EMI layout around the analog inputs.
Drop-in alternatives for PIC14000-04I/SO β 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 PIC14000-04I/SO (same form factor and footprint) β differing in Package, Program Memory Type, Core Architecture, Mounting Type, RAM Size.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC14000-04E/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC14000T-04E/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC14000-04I/JW
β Drop-Inπ Reference alternative (not in catalog)
PIC14000-04/SS
β Drop-Inβ In Stock
$4.4 / Unit
View Datasheet βPIC14000-04E/SS
β Drop-Inπ Reference alternative (not in catalog)
PIC14000-04I/SO Maximum Ratings & Electrical Characteristics
| Product Type | 8-bit Mixed-Signal Microcontroller (MCU) |
| Core Architecture | PIC RISC (Harvard) |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4K x 14) |
| RAM Size | 192 bytes |
| Maximum CPU Frequency | 20 MHz clock input (4 MHz instruction rate per datasheet) |
| Instruction Set Size | 35 single-word instructions |
| Instruction Execution Time | 200 ns |
| I/O Pins | 20 |
| External Interrupts | 5 |
| Internal Interrupts | 6 |
| ADC | 8-bit, 8 channels (per datasheet family description) |
| Package | 28-SOIC (0.295 inch / 7.50 mm body width) |
| Mounting Type | Surface Mount |
| Temperature Grade | Industrial |
| Terminal Form | Gull Wing |
| RoHS Status | Compliant (per DigiKey listing) |
PIC14000-04I/SO Pin Configuration
| Pin 1 | RA0/AN0 β Digital I/O / Analog input channel 0 |
| Pin 2 | RA1/AN1 β Digital I/O / Analog input channel 1 |
| Pin 3 | RA2/AN2 β Digital I/O / Analog input channel 2 |
| Pin 4 | RA3/AN3 β Digital I/O / Analog input channel 3 |
| Pin 5 | RA4/AN4 β Digital I/O / Analog input channel 4 |
| Pin 6 | RA5/AN5 β Digital I/O / Analog input channel 5 |
| Pin 7 | RA6/AN6 β Digital I/O / Analog input channel 6 |
| Pin 8 | RA7/AN7 β Digital I/O / Analog input channel 7 |
| Pin 9 | OSC1 β Oscillator input |
| Pin 10 | OSC2 β Oscillator output |
| Pin 11 | RC0 β Digital I/O port C bit 0 |
| Pin 12 | RC1 β Digital I/O port C bit 1 |
| Pin 13 | RC2 β Digital I/O port C bit 2 |
| Pin 14 | RC3 β Digital I/O port C bit 3 |
| Pin 15 | RC4 β Digital I/O port C bit 4 |
| Pin 16 | RC5 β Digital I/O port C bit 5 |
| Pin 17 | RC6 β Digital I/O port C bit 6 |
| Pin 18 | RC7 β Digital I/O port C bit 7 |
| Pin 19 | VSS β Ground reference |
| Pin 20 | VDD β Positive supply voltage |
| Pin 21 | RB0/INT β Digital I/O / External interrupt |
| Pin 22 | RB1 β Digital I/O port B bit 1 |
| Pin 23 | RB2 β Digital I/O port B bit 2 |
| Pin 24 | RB3 β Digital I/O port B bit 3 |
| Pin 25 | RB4 β Digital I/O port B bit 4 |
| Pin 26 | RB5 β Digital I/O port B bit 5 |
| Pin 27 | RB6 β Digital I/O port B bit 6 |
| Pin 28 | RB7/MCLR β Digital I/O port B bit 7 / Master Clear (reset) |
Typical Applications
PIC14000-04I/SO is suitable for 6 applications: Battery Charger Controller, Battery Capacity / Fuel Gauge Monitor, Precision Sensor Data Logger, Standalone Sensor Signal Conditioner, Portable / Handheld Measurement Device, Smart Battery Pack / SMBus Slave.
Battery Charger Controller
The PIC14000-04I/SO integrates a PIC RISC core with on-chip analog blocks specifically tuned for closed-loop battery charger control. The 8-bit ADC samples charge current and battery voltage, while the switched-capacitor bandgap reference provides a stable voltage reference independent of battery state-of-charge. With 35 instructions executing in 200 ns, the device implements CC/CV (constant-current/constant-voltage) charge profiles, end-of-scharge detection, and timer-based termination in firmware. The 28-SOIC footprint occupies minimal PCB area, ideal for charger bricks and embedded battery packs where size and BOM cost matter.
Recommended
Battery Capacity / Fuel Gauge Monitor
The PIC14000-04I/SO is designed for capacity monitoring per its datasheet application note, where the integrated 8-bit ADC and on-chip programmable gain stage directly digitize current-sense shunt and battery voltage. The 192-byte SRAM buffers coulomb-counting accumulators, while 7 KB OTP stores calibration data, look-up tables for chemistry compensation, and SMBus/I2C state machines. Industrial temperature grade (-40C to +85C) handles automotive underhood and outdoor solar deployments, and the 28-SOIC package survives hand-solder rework common during prototyping.
Recommended
Precision Sensor Data Logger
For unattended data logging of thermocouples, strain gauges, or bridge-type sensors, the PIC14000-04I/SO combines 8-bit ADC sampling with on-chip PGA gain stages to amplify microvolt-level signals without external instrumentation amplifiers. The PIC RISC core compresses and time-stamps samples, then writes to external EEPROM via I2C, conserving the 7 KB OTP for the logger engine and CRC routines. Low-power SLEEP modes drop quiescent current during inter-sample intervals, allowing years of battery operation in remote telemetry deployments where physical access is rare.
Recommended
Standalone Sensor Signal Conditioner
The PIC14000-04I/SO replaces discrete op-amp signal chains with on-chip analog blocks, delivering conditioned 4-20 mA or 0-10 V outputs from raw bridge or thermocouple inputs. The 20 programmable digital I/O pins drive status LEDs, relay coils, and HMI keypads without external glue logic. Integrated 5 external interrupts handle endstop, over-range, and watchdog events with deterministic latency matching the 200 ns instruction cycle - critical for industrial process control loops.
Recommended
Portable / Handheld Measurement Device
Battery-powered DMMs, clamp meters, and handheld medical devices benefit from the PIC14000-04I/SO's low-power SLEEP modes (microamp-range quiescent) and on-chip analog front-end that digitizes sensor signals directly. The industrial temperature grade supports outdoor and cold-storage use, while 28-SOIC enables thin handheld enclosures. Firmware-resident math routines implement RMS, peak-detect, and min/max functions using 192 bytes SRAM for sliding-window buffers.
Recommended
Smart Battery Pack / SMBus Slave
Inside a smart battery pack, the PIC14000-04I/SO implements the SMBus slave state machine, reports StateOfCharge and StateOfHealth registers over I2C, and runs charge-balancing algorithms on cell voltages via the 8-channel ADC. The mixed-signal integration eliminates external ADC, voltage reference, and gain-stage ICs that a discrete MCU implementation would need, cutting BOM cost by 30-50% in 2-cell and 3-cell Li-ion packs.
Recommended
Recommended Products Summary
Engineering reference data for PIC14000-04I/SO β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC14000-04E/SO | PIC14000T-04E/SO | PIC14000-04I/JW | PIC14000-04/SS | PIC14000-04E/SS |
|---|---|---|---|---|---|---|
| Package | 28-SOIC (0.295 inch / 7.50 mm) | 28-SOIC - same | 28-SOIC - same | 28-CDIP (windowed) - same pinout | 28-SSOP - same pinout, smaller footprint | 28-SSOP - same pinout, smaller footprint |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB EPROM (windowed) | 7 KB OTP | 7 KB OTP |
| RAM Size | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
| CPU Frequency | 20 MHz / 4 MHz instruction | 20 MHz / 4 MHz instruction | 20 MHz / 4 MHz instruction | 20 MHz / 4 MHz instruction | 20 MHz / 4 MHz instruction | 20 MHz / 4 MHz instruction |
| Temperature Grade | Industrial (-40C to +85C) | Extended (-40C to +125C) | Extended (-40C to +125C) | Industrial (-40C to +85C) | Commercial (0C to +70C) | Extended (-40C to +125C) |
| I/O Pins | 20 | 20 | 20 | 20 | 20 | 20 |
| Memory Type | OTP | OTP | OTP | EPROM (windowed, UV-erasable) | OTP | OTP |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | NRND |
Key Differentiators
- Mixed-signal on-chip analog integration (vs Generic PIC16F876A)
- Industrial temperature grade in 28-SOIC (vs PIC14000-04/SO (commercial))
- Long-term distributor availability vs NRND status (vs PIC16F917 (active flash alternative))
Design Notes
The PIC14000-04I/SO is OTP (one-time programmable), not flash. Once programmed, code cannot be erased or modified. Engineers should prototype with CERDIP windowed variants (e.g., PIC14000-04I/JW) before committing the SOIC-OTP version to production PCB. Microchip's MPLAB ICE and PICSTART+ programmers support both package types via separate sockets. Verify all firmware revision control discipline since field upgrades require physical chip replacement.
The 28-SOIC package has 0.295 inch (7.50 mm) body width - ensure PCB land patterns follow IPC-7351 nominal SOIC-28 footprints, with 1.27 mm pin pitch. Place a 100 nF decoupling capacitor within 5 mm of the VDD pin (pin 20) and a 10 uF bulk capacitor on the same supply trace. For analog applications, separate AGND and DGND planes and join them at a single point near the MCU VSS pin (pin 19) to minimize ADC noise coupling.
The PIC14000 analog inputs are shared with digital I/O on PORTA. When configuring a pin for ADC use, disable digital drive by clearing the corresponding TRISA bit and set the A/D control registers to high-impedance analog mode. Keep analog traces short and guarded with ground pour to avoid digital switching noise coupling into ADC readings - critical for thermocouple and bridge-sensor conditioning applications where microvolt signals are amplified.
The PIC14000-04I/SO supports multiple low-power SLEEP modes. Quiescent current drops to microamp range in deep sleep, with wake-up via external interrupt, internal timer, or watchdog reset. For battery-powered data loggers, use SLEEP between ADC samples to extend operating life by 10-100x. The on-chip bandgap and ADC remain off in SLEEP; allow 20 us settling time after wake-up before sampling for accurate conversions.
Compliance Information
RoHS compliance confirmed per DigiKey listing. AEC-Q100 not qualified - this is a Microchip NRND industrial-grade MCU, not automotive-qualified. For AEC-Q100 requirements, consider PIC16F or PIC18 automotive-grade variants.
