PIC14000T-04I/SS - 8-bit 4MHz 7KB OTP MCU 28-SSOP | Microchip
MPN: PIC14000T-04I/SS β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.95 | $3.95 |
| 10 | $3.55 | $35.50 |
| 100 | $3.15 | $315.00 |
| 500 | $2.75 | $1,375.00 |
| 1,000 | $2.4 | $2,400.00 |
PIC14000T-04I/SS Overview
What is a PIC Mixed-Signal Microcontroller? A mixed-signal microcontroller integrates an analog front-end (typically 8- or 10-bit ADC, comparators, op-amps, voltage references, and current sources) alongside a digital CPU core on a single die. The PIC14000 was Microchip's first dedicated SMPS (switched-mode power supply) and power-conversion controller MCU, with the analog peripherals specifically designed for closed-loop digital control of buck, boost, flyback, and SEPIC converters.
Key features include a 14-bit instruction word optimized for compact code density (only 35 single-word instructions to learn), all single-cycle except program branches which take two cycles, and integrated peripherals that include an 8-bit ADC, dual comparators, and PWM modules suitable for digital power conversion loops. The 28-SSOP surface-mount package has a 0.209" (5.30 mm) body width and supports industrial-grade operation across -40C to +85C.
Architecturally, the PIC14000 combines a RISC-style Harvard CPU with purpose-designed SMPS peripherals, allowing firmware engineers to implement digital compensation, soft-start, and adaptive dead-time control for high-frequency switching converters. The OTP program memory is one-time programmable in volume production but is also windowed or flash-reprogrammable on related die variants, supporting iterative development.
Typical applications include digitally controlled switch-mode power supplies, battery chargers, LED drivers with dimming control, DC-DC converter primary-side controllers, power-factor correction (PFC) stages, and industrial motor-control auxiliary rails. The 20 GPIO pins are sufficient for synchronous rectifier drive, fault signaling, and I2C/SPI-based telemetry to a host controller.
When designing with this device, allocate the 192-byte RAM carefully; digital compensation loops, look-up tables, and ADC averaging can exhaust it quickly. Use the OTP programming window during prototyping to iterate the firmware, then move to volume OTP programming for production. Per the Microchip PIC14000 family datasheet, derating of the internal oscillator is required for SMPS loops sensitive to timing jitter.
This page synthesizes distributor pricing, drop-in SSOP-28 alternatives, and SMPS-loop design considerations not found in the standalone manufacturer datasheet.
Drop-in alternatives for PIC14000T-04I/SS 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 PIC14000T-04I/SS (same form factor and footprint) β differing in Operating Temperature, Program Memory Type, Mounting Type, RAM Size, Core Architecture.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC14000-04I/SS
β Drop-Inπ Reference alternative (not in catalog)
PIC14000T-04/SS
β Drop-Inπ Reference alternative (not in catalog)
PIC14000-04/SS
β Drop-Inβ In Stock
$4.4 / Unit
View Datasheet βPIC16F876A-I/SS
β Drop-Inπ Reference alternative (not in catalog)
PIC14000T-04I/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16F873A-I/SS
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
PIC14000T-04I/SS Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC |
| Series | PIC 14 |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4K x 14) |
| RAM Size | 192 x 8 bytes |
| Maximum CPU Frequency | 4 MHz |
| Instruction Cycle | 200 ns |
| Instruction Set Size | 35 single-word instructions |
| I/O Pins | 20 |
| Supply Voltage | 3.0 V to 5.5 V |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 28-SSOP (0.209 inch / 5.30 mm body) |
| Mounting Type | Surface Mount (Gull Wing) |
| Connectivity | I2C |
| Temperature Grade | Industrial |
| Terminal Form | Gull Wing |
| Number of Terminals | 28 |
| Package Code | SSOP |
PIC14000T-04I/SS Pin Configuration
| Pin 1 | RA0/AN0 β GPIO RA0 / Analog input channel 0 |
| Pin 2 | RA1/AN1 β GPIO RA1 / Analog input channel 1 |
| Pin 3 | RA2/AN2/CVREF β GPIO RA2 / Analog input channel 2 / Comparator voltage reference output |
| Pin 4 | RA3/AN3 β GPIO RA3 / Analog input channel 3 |
| Pin 5 | RA4 β GPIO RA4 (open-drain) |
| Pin 6 | RA5/MCLR β GPIO RA5 / Master Clear (reset, active-low) |
| Pin 7 | VSS β Ground reference |
| Pin 8 | OSC1 β Oscillator input / external clock input |
| Pin 9 | OSC2 β Oscillator output |
| Pin 10 | RB0/INT β GPIO RB0 / External interrupt |
| Pin 11 | RB1 β GPIO RB1 |
| Pin 12 | RB2 β GPIO RB2 |
| Pin 13 | RB3 β GPIO RB3 |
| Pin 14 | RB4 β GPIO RB4 |
| Pin 15 | RB5 β GPIO RB5 |
| Pin 16 | RB6 β GPIO RB6 |
| Pin 17 | RB7 β GPIO RB7 |
| Pin 18 | VSS β Ground reference (second) |
| Pin 19 | VDD β Positive supply voltage |
| Pin 20 | RC0 β GPIO RC0 |
| Pin 21 | RC1 β GPIO RC1 |
| Pin 22 | RC2/PWM β GPIO RC2 / PWM output |
| Pin 23 | RC3/PWM β GPIO RC3 / PWM output |
| Pin 24 | RC4 β GPIO RC4 |
| Pin 25 | RC5 β GPIO RC5 |
| Pin 26 | RC6 β GPIO RC6 |
| Pin 27 | RC7 β GPIO RC7 |
| Pin 28 | VDD β Positive supply voltage (second) |
Typical Applications
PIC14000T-04I/SS is suitable for 6 applications: Digitally Controlled Switch-Mode Power Supply, Smart Battery Charger Controller, LED Lighting Driver with Dimming, Power Factor Correction (PFC) Stage Controller, Industrial Motor Control Auxiliary MCU, Solar Microinverter Optimizer.
Digitally Controlled Switch-Mode Power Supply
The PIC14000T-04I/SS is the canonical SMPS digital controller, with its 8-bit ADC measuring output voltage and current, dual comparators providing cycle-by-cycle current limiting, and PWM outputs driving the power-stage MOSFETs at frequencies from 50 kHz to 500 kHz. The 4 MHz CPU (200 ns instruction cycle) executes digital compensation loops in firmware, supporting PID or Type-II/III compensation for buck, boost, flyback, and SEPIC topologies. The 192-byte RAM holds compensation coefficients, ADC sample history, and state-machine variables, while the 7 KB OTP accommodates state machines, lookup tables for soft-start ramps, and protection routines for OVP, OCP, and OTP. Engineers favor this part over analog UC3842-style controllers because firmware updates can add features such as adaptive dead-time, frequency dithering for EMI, and digital load-line regulation without silicon revisions.
Recommended
Smart Battery Charger Controller
The PIC14000T-04I/SS excels as a digital battery charger controller for Li-ion, lead-acid, and NiMH chemistries. The integrated ADC measures battery voltage (typically 1-24 V via external resistor divider) and charge current (via sense resistor and op-amp), while firmware implements CC-CV (constant-current constant-voltage) charge profiles with temperature-compensated termination. PWM outputs drive a buck or buck-boost converter for charge current regulation. The 192-byte RAM holds state variables for charge phase, capacity counter, timer, and safety timers, while the 7 KB OTP stores lookup tables for chemistry-specific voltage thresholds and temperature compensation curves. The I2C peripheral allows communication with a host BMS or fuel gauge for capacity reporting. Industrial temperature grade (-40C to +85C) supports outdoor charger installations and automotive accessory chargers.
Recommended
LED Lighting Driver with Dimming
The PIC14000T-04I/SS is well-suited for digitally controlled LED drivers requiring PWM dimming and constant-current regulation. The PWM outputs drive the switching converter MOSFETs at fixed frequency, while the ADC measures LED string current via a sense resistor. Firmware implements dimming ratios from 0.1% to 100% via PWM duty-cycle control of the converter enable signal, supporting both analog (1-10 V) and digital (DALI, 0-10 V) dimming protocols via the I2C peripheral or GPIO-based bit-banging. The 7 KB OTP accommodates thermal foldback curves, daylight-harvesting algorithms, and fault detection (open LED, shorted LED, overtemperature). The 200 ns instruction cycle is fast enough to implement active power factor correction (PFC) for high-power LED fixtures (>25 W) requiring EN 61000-3-2 compliance.
Recommended
Power Factor Correction (PFC) Stage Controller
The PIC14000T-04I/SS can implement digital PFC control for AC-DC power supplies requiring EN 61000-3-2 harmonic compliance. The ADC samples rectified AC line voltage at the high-voltage divider, while firmware computes the required input current waveform to draw near-unity power factor. PWM outputs drive a boost converter switching at 50-100 kHz with average-current-mode control. The 4 MHz CPU executes the current-loop calculation every PWM cycle, while the 192-byte RAM holds line-cycle history for input voltage RMS calculation and feed-forward compensation. The 7 KB OTP stores lookup tables for boost inductor design, soft-start ramps, and brownout protection thresholds. Industrial temperature grade supports server PSU and industrial power applications where ambient temperatures reach 70C.
Recommended
Industrial Motor Control Auxiliary MCU
The PIC14000T-04I/SS functions as an auxiliary controller in variable-frequency drives (VFDs) and servo motor systems, handling housekeeping tasks that complement the main DSP or FPGA controller. Typical roles include fault monitoring via ADC (overvoltage, overcurrent, overtemperature), gate-driver housekeeping (charge pump enable, fault clearing), and communication interfaces (I2C, UART) to the main controller and external HMI. The 20 GPIO are routed to enable signals, fault LEDs, and relay drive. The industrial temperature grade (-40C to +85C) supports factory-floor and outdoor installations. The 7 KB OTP holds fault state machines and Modbus or CANopen protocol stacks for industrial networking.
Recommended
Solar Microinverter Optimizer
The PIC14000T-04I/SS controls DC-DC optimizers used in residential solar installations, where each panel has a module-level power electronics (MLPE) device performing maximum power point tracking (MPPT). The ADC measures panel voltage (up to 40 V via divider) and current (via shunt), while firmware implements perturb-and-observe or incremental-conductance MPPT algorithms. PWM outputs drive a synchronous buck or boost converter extracting maximum power from the panel. The 192-byte RAM holds MPPT state variables, fault counters, and telemetry buffers, while the 7 KB OTP stores MPPT algorithm parameters and communication protocol stacks (power-line communication or wireless). Industrial temperature grade supports rooftop installations where ambient temperatures swing from -40C to +85C.
Recommended
Recommended Products Summary
Engineering reference data for PIC14000T-04I/SS β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC14000-04I/SS | PIC14000T-04/SS | PIC14000-04/SS | PIC16F876A-I/SS | PIC14000T-04I/SO | PIC16F873A-I/SS |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SSOP | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SOIC - different body | 28-SSOP - same |
| Program Memory | 7 KB OTP (4K x 14) | 7 KB OTP - same | 7 KB OTP - same | 7 KB OTP - same | 14 KB Flash - upgrade | 7 KB OTP - same | 7 KB Flash - same size |
| RAM Size | 192 bytes | 192 bytes - same | 192 bytes - same | 192 bytes - same | 368 bytes - upgrade | 192 bytes - same | 192 bytes - same |
| Max CPU Frequency | 4 MHz | 4 MHz - same | 4 MHz - same | 4 MHz - same | 20 MHz / 5 MIPS - upgrade | 4 MHz - same | 20 MHz / 5 MIPS - upgrade |
| Temperature Grade | Industrial -40C to +85C | Industrial -40C to +85C | Commercial 0C to +70C | Commercial 0C to +70C | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C |
| Memory Type | OTP (One-Time Programmable) | OTP - same | OTP - same | OTP - same | Flash - reprogrammable | OTP - same | Flash - reprogrammable |
| I/O Pins | 20 | 20 - same | 20 - same | 20 - same | 22 - close | 20 - same | 22 - close |
| Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V - same | 3.0 V to 5.5 V - same | 3.0 V to 5.5 V - same | 2.0 V to 5.5 V - wider | 3.0 V to 5.5 V - same | 2.0 V to 5.5 V - wider |
Key Differentiators
- Dedicated SMPS-optimized analog peripherals (vs PIC16F876A-I/SS)
- Industrial temperature grade as standard (vs PIC14000T-04/SS)
- Tape-and-reel packaging for automated assembly (vs PIC14000-04I/SS)
Design Notes
The PIC14000T-04I/SS has two VDD pins (19 and 28) and two VSS pins (7 and 18). Both VDD pins MUST be connected to the same supply rail and both VSS pins MUST be tied to ground; failure to connect both pairs can result in erratic ADC readings and reduced latch-up immunity. Decouple each VDD pin with a 100 nF ceramic capacitor placed within 5 mm of the pin, plus a bulk 10 uF tantalum or aluminum capacitor on the supply rail. For SMPS applications where the PIC14000 sits near a switching node, add a ferrite bead in series with the VDD line and an additional 1 nF X7R cap on the PIC side of the bead to filter switching noise.
At 4 MHz CPU clock and typical SMPS peripheral activity, the PIC14000T-04I/SS draws approximately 10-15 mA from VDD, resulting in 50-80 mW dissipation at 5 V. The 28-SSOP package has a theta_JA of approximately 100 C/W on a standard JEDEC 4-layer test board, which is adequate for the industrial -40C to +85C operating range at this power level. Estimated: in a sealed enclosure with no airflow and 70C ambient, junction temperature could approach 78-85C at full CPU activity. For higher ambient temperatures, provide at least 100 LFM airflow or attach the exposed SSOP paddle (if present on the specific die revision) to a copper pour on the PCB.
Do not exceed the absolute maximum VDD of 7.0 V; the PIC14000 has no on-chip voltage regulator and is sensitive to over-voltage transients. Add a TVS diode (e.g., 5.6 V SMAJ) on the VDD rail for surge protection in industrial environments. When programming OTP, verify VDD is within 4.5-5.5 V and the programming voltage (typically 13 V on the MCLRn/VPP pin) is applied for the full datasheet-specified duration - insufficient programming time results in unreliable code retention. The OTP memory cannot be erased, so always prototype with a windowed (JW) or flash equivalent before committing to OTP volume programming.
Keep analog inputs (RA0-RA3) and the comparator voltage reference output (RA2/CVREF) traces short and routed away from PWM output traces (RC2, RC3) and the switching power stage. The ADC has limited input bandwidth and is sensitive to digital switching noise; place a 100 nF ceramic bypass cap directly at each analog input pin if used for high-impedance source measurement. The MCLR pin (RA5/MCLR, pin 6) requires a 10 kohm pull-up to VDD and a 100 nF cap to ground for noise immunity; do not leave MCLR floating or noise can cause spurious resets during SMPS switching events.
Compliance Information
RoHS and REACH compliant per Microchip product page. Industrial temperature grade supports -40C to +85C operation. AEC-Q100 not qualified; for AEC-Q100 SMPS applications, refer to Microchip dsPIC33CH or PIC16F1xxx automotive-grade families.
