PIC14000-20I/SS - 7KB EPROM 8-bit MCU | Microchip SSOP-28
MPN: PIC14000-20I/SS ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.92 | $8.92 |
| 10 | $8.03 | $80.30 |
| 100 | $7.14 | $714.00 |
| 500 | $6.25 | $3,125.00 |
| 1,000 | $5.36 | $5,360.00 |
PIC14000-20I/SS Overview
A microcontroller (MCU) is a single-chip computer that contains a processor core, memory, and programmable I/O peripherals. The PIC architecture uses a RISC-based Harvard design with separate program and data paths, allowing most instructions to execute in one instruction cycle. The PIC14 family sits between the PIC16 and PIC12F sub-families in Microchip's lineup, targeting applications that need more analog integration than baseline PIC16 devices while keeping the pin count modest.
Key features of the PIC14000-20I/SS include an on-chip temperature sensor, a bandgap voltage reference, an internal oscillator, a Sigma-Delta slope A/D converter, a 4-bit programmable current source, a low-voltage detector (LVD), a voltage-regulator control output, and a programmable reference generator. This integrated analog front end lets a single chip replace several external analog components, which is the defining characteristic of the PIC14 series. The industrial-grade operating range is -40 °C to +85 °C, suitable for factory and outdoor equipment.
Typical applications include battery chargers, smart battery management, sensor conditioning, switching power supply control loops, and process control transmitters. Each application exploits the combination of the Sigma-Delta converter (for high-resolution slow signals like thermistors), the programmable current source (for 4-20 mA loop excitation), and the bandgap reference (for ratiometric measurements).
When designing with this device, allocate oscillator configuration time before A/D conversion begins, and follow the datasheet's decoupling guidance (typically 0.1 µF VDD pin capacitor plus bulk capacitance) to keep the Sigma-Delta converter noise floor low. The PIC14000 is now in Microchip's "Not Recommended for new designs" status, so designers of new products should evaluate the modern PIC16F or PIC18 successors.
Drop-in alternatives for PIC14000-20I/SS — 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 PIC14000-20I/SS (same form factor and footprint) — differing in Program Memory Type, Instruction Cycle Time, Package, Program Memory Size, Maximum Clock Frequency.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC14000-04/SS
✅ Drop-In✓ In Stock
$4.4 / Unit
View Datasheet →PIC14000T-20I/SS
✅ Drop-In✓ In Stock
$4.55 / Unit
View Datasheet →PIC14000-20/SS
✅ Drop-In✓ In Stock
$3.78 / Unit
View Datasheet →PIC14000-20I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F84A-20I/SS
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC14000-20I/SS Maximum Ratings & Electrical Characteristics
| Product Family | PIC® 14 Series |
| Device Sub-family | PIC14000 (mixed-signal) |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 7 KB (4K x 14 words) |
| Data RAM | 192 bytes |
| CPU Core | 8-bit PIC RISC |
| Instruction Set Size | 35 single-word instructions |
| Instruction Cycle Time | 200 ns at 20 MHz |
| Maximum Clock Frequency | 20 MHz |
| Operating Voltage | 4.5 V to 5.5 V |
| Digital I/O Pins | 20 |
| Operating Temperature | -40 °C to +85 °C (Industrial) |
| A/D Converter | Sigma-Delta slope converter (on-chip) |
| Package | 28-pin SSOP (0.209 in / 5.30 mm width) |
| Mounting Type | Surface Mount |
| On-chip Analog Features | Temperature sensor, bandgap Vref, programmable current source, LVD, Vreg control output |
PIC14000-20I/SS Pin Configuration
| Pin 1 | RA2/AN2 — Digital I/O / analog input channel 2 |
| Pin 2 | RA3/AN3 — Digital I/O / analog input channel 3 |
| Pin 3 | RA4 — Digital I/O (open-drain option) |
| Pin 4 | MCLR — Master clear reset (active low) |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RA0/AN0 — Digital I/O / analog input channel 0 |
| Pin 7 | RA1/AN1 — Digital I/O / analog input channel 1 |
| Pin 8 | OSC1 — Oscillator input |
| Pin 9 | OSC2 — Oscillator output |
| Pin 10 | RC0 — Digital I/O port C bit 0 |
| Pin 11 | RC1 — Digital I/O port C bit 1 |
| Pin 12 | RC2 — Digital I/O port C bit 2 |
| Pin 13 | RC3 — Digital I/O port C bit 3 |
| Pin 14 | RC4 — Digital I/O port C bit 4 |
| Pin 15 | RC5 — Digital I/O port C bit 5 |
| Pin 16 | RC6 — Digital I/O port C bit 6 |
| Pin 17 | RC7 — Digital I/O port C bit 7 |
| Pin 18 | RB0/AN4 — Digital I/O / analog input channel 4 (interrupt-on-change) |
| Pin 19 | RB1/AN5 — Digital I/O / analog input channel 5 |
| Pin 20 | RB2/AN6 — Digital I/O / analog input channel 6 |
| Pin 21 | RB3/AN7 — Digital I/O / analog input channel 7 |
| Pin 22 | RB4 — Digital I/O port B bit 4 (interrupt-on-change) |
| Pin 23 | RB5 — Digital I/O port B bit 5 (interrupt-on-change) |
| Pin 24 | RB6 — Digital I/O port B bit 6 (interrupt-on-change, ICSP clock) |
| Pin 25 | RB7 — Digital I/O port B bit 7 (interrupt-on-change, ICSP data) |
| Pin 26 | VREG — Voltage regulator control output |
| Pin 27 | VDD — Positive supply (4.5 V to 5.5 V) |
| Pin 28 | NC — Not connected (per datasheet) |
Typical Applications
PIC14000-20I/SS is suitable for 6 applications: Smart Battery Charger Controller, Industrial 4-20 mA Loop Sensor Transmitter, Switch-Mode Power Supply (SMPS) Control, Automotive Battery Monitoring Sensor, Precision Thermistor Signal Conditioner, Portable Medical Sensor Interface.
Smart Battery Charger Controller
The PIC14000-20I/SS is well suited for smart battery charger control because its integrated 4-bit programmable current source and Sigma-Delta slope A/D converter eliminate external current-sense and ADC circuitry. Engineers typically configure the current source as a programmable trickle/fast-charge current reference and use the A/D converter to monitor battery voltage and temperature via the on-chip sensor. The 20 MHz core executes 200 ns instructions, which is fast enough for CC-CV charge loop PWM updates without needing DMA. Compared with a discrete analog charger, the PIC14000's 7 KB OTP EPROM stores full charge profiles and safety timers while the bandgap reference keeps the regulation accurate across the -40 to +85 °C industrial range.
Recommended
Industrial 4-20 mA Loop Sensor Transmitter
The PIC14000-20I/SS's 4-bit programmable current source is purpose-built for generating 4-20 mA industrial loop excitation, which is the de-facto standard in process control. The on-chip Sigma-Delta slope converter delivers high-resolution ratiometric measurements of bridge sensors and RTDs while the bandgap voltage reference maintains accuracy across the industrial temperature grade. The 20 MHz core supports HART or similar modulation overlays on the loop current without burdening timing margins. Compared with a discrete loop transmitter design, the PIC14000 reduces the BOM to a single chip plus output transistor, and the 192-byte RAM is sufficient for linearization tables and self-calibration coefficients stored in the 7 KB OTP.
Recommended
Switch-Mode Power Supply (SMPS) Control
The PIC14000-20I/SS includes a dedicated voltage regulator control output, an LVD for input under-voltage lockout, and a bandgap reference - all required building blocks for a primary-side SMPS controller. The 200 ns instruction cycle at 20 MHz closes voltage-mode and current-mode control loops fast enough for sub-100 W converters running up to 250 kHz PWM. The integrated Sigma-Delta converter reads output voltage feedback directly, removing the need for an external ADC. Compared with a pure analog UC3842-style controller, the PIC14000 enables firmware-configurable soft-start, frequency foldback, and efficiency curves while operating from the 4.5-5.5 V industrial supply range.
Recommended
Automotive Battery Monitoring Sensor
The PIC14000-20I/SS's on-chip temperature sensor, bandgap voltage reference, and Sigma-Delta converter make it suitable for 12 V automotive battery monitoring nodes that report state-of-charge and temperature to a CAN bus master. The 20 MHz instruction cycle supports fast periodic sampling of multiple battery cells with firmware-driven averaging. The industrial -40 to +85 °C operating range covers most under-hood positions, though for higher-temperature engine bay placements an extended-grade variant is preferred. Compared with a discrete ADC + op-amp front end, the PIC14000's integrated analog suite reduces PCB area by roughly 40% and improves measurement repeatability by colocating the reference and converter on-chip.
Recommended
Precision Thermistor Signal Conditioner
The PIC14000-20I/SS's programmable current source can directly excite a thermistor or RTD while the on-chip Sigma-Delta converter digitizes the resulting voltage with high noise rejection. The internal bandgap reference provides a stable ratiometric measurement baseline, eliminating ratiometric drift that plagues discrete designs. The 192-byte data RAM and 7 KB OTP EPROM store lookup tables and Steinhart-Hart coefficients for linearized temperature output. Compared with a stand-alone ADC approach, the PIC14000's single-chip integration simplifies the BOM, and the 20 MHz instruction throughput runs polynomial linearization in real time for thermistor networks with sub-1 °C accuracy targets.
Recommended
Portable Medical Sensor Interface
The PIC14000-20I/SS's low-power CMOS design, on-chip temperature sensor, and Sigma-Delta converter are well matched to battery-powered medical sensor interfaces such as pulse oximeters or single-lead ECG front ends. The 20 MHz instruction cycle executes digital filtering of the A/D stream without burdening response time, while the 4.5-5.5 V supply range accommodates a single Li-Ion cell plus boost regulator. Compared with a discrete op-amp + ADC + MCU design, the PIC14000 reduces component count and improves EMI immunity by colocating analog and digital sections on a single die. The industrial -40 to +85 °C range is sufficient for clinical environments, and the 192-byte RAM supports circular buffering of sensor data.
Recommended
Recommended Products Summary
Engineering reference data for PIC14000-20I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC14000-04/SS | PIC14000T-20I/SS | PIC14000-20/SS | PIC14000-20I/SO | PIC16F84A-20I/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-pin SSOP | 28-pin SSOP - same | 28-pin SSOP - same | 28-pin SSOP - same | 28-pin SOIC (different footprint) | 20-pin SSOP (different footprint) |
| Maximum Clock Frequency | 20 MHz | 4 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Instruction Cycle Time | 200 ns | 1 µs | 200 ns | 200 ns | 200 ns | 200 ns |
| Program Memory | 7 KB OTP EPROM | 7 KB OTP EPROM | 7 KB OTP EPROM | 7 KB OTP EPROM | 7 KB OTP EPROM | 1.75 KB Flash |
| Data RAM | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 68 bytes |
| On-chip A/D Converter | Sigma-Delta slope | Sigma-Delta slope | Sigma-Delta slope | Sigma-Delta slope | Sigma-Delta slope | None (no integrated ADC) |
| Operating Temperature | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C | -40 °C to +85 °C | 0 °C to +70 °C (Commercial) | -40 °C to +85 °C | -40 °C to +85 °C |
| Lifecycle Status | NRND (Not Recommended for new designs) | NRND | NRND | NRND | NRND | Active |
Key Differentiators
- Higher program memory than PIC16 baseline (vs PIC16F84A-20I/SS)
- On-chip Sigma-Delta slope A/D converter (vs PIC16F84A-20I/SS)
- Industrial temperature range by default (vs PIC14000-20/SS)
Design Notes
Estimated: the PIC14000-20I/SS draws up to ~25 mA active at 20 MHz and ~5 µA sleep per the PIC14000 datasheet (40122) section on DC characteristics. Decouple VDD with a 0.1 µF ceramic capacitor placed within 5 mm of pin 27, plus a 10 µF bulk capacitor on the same supply trace. The internal voltage regulator control output (pin 26) requires an external pass transistor when driving external loads; do not short this pin directly to the rail as it is the base/gate drive, not the regulated output. Power-on reset is automatic below the LVD threshold (typically 4.0 V).
Route the analog inputs (RA0-RA3, RB0-RB3) as short, guarded traces away from the digital port C and clock lines (OSC1/OSC2) to keep the Sigma-Delta converter's noise floor low. The bandgap reference pin should be bypassed with a 0.1 µF ceramic to VSS if exposed externally; otherwise leave it to the internal connection. Place the MCLR pull-up (typically 10 kΩ to VDD) close to the package to ensure clean reset behavior. SSOP-28 has 0.65 mm pitch - hand soldering is impractical, so use reflow or hot-air rework when prototyping.
Common PIC14000-20I/SS design pitfalls: (1) Treating OTP EPROM as re-programmable - it is one-time programmable, so any firmware change requires a new part; design with the Flash-based PIC16F883 as a modern alternative if you anticipate firmware revisions. (2) Skipping the ICSP clock/data pull-ups on RB6/RB7 - field firmware updates will be impossible. (3) Driving the VREG control output directly into a load instead of through an external pass transistor. (4) Confusing the PIC14000 pinout with the PIC16F883 - they are not pin-compatible and cannot share a PCB layout. (5) Operating below 4.5 VDD will trigger LVD reset; ensure supply regulation holds above this threshold under all load transients.
Compliance Information
RoHS and REACH compliance status not stated in the verified web data for PIC14000-20I/SS; lead-free is per Microchip standard ordering information; conflict-minerals compliance standard for Microchip franchise parts. AEC-Q100 not qualified - this is an industrial-grade part, not automotive.
