PIC18C452T-E/L - 32KB OTP 8-bit MCU, 44-PLCC | Microchip
MPN: PIC18C452T-E/L ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $17.2 | $172.00 |
| 100 | $15.85 | $1,585.00 |
| 500 | $14.4 | $7,200.00 |
| 1,000 | $13.1 | $13,100.00 |
PIC18C452T-E/L Overview
What is an 8-bit OTP microcontroller? An OTP (One-Time-Programmable) microcontroller is a microcontroller whose program memory is implemented as one-time-writable non-volatile storage - the bit cells can be written once by the user but cannot be erased electrically. This positions the PIC18C452 in the broader hierarchy of microcontrollers -> 8-bit MCUs -> OTP MCUs -> embedded controllers. Compared to flash-based MCUs, OTP parts offer lower per-unit cost in high-volume production and slightly smaller die area, while still preserving the same instruction set and peripheral set across the family.
Key features of the PIC18C452T-E/L include 10 MIPS throughput at 40 MHz, a 10-bit successive-approximation ADC with up to 8 input channels, a Master SSP (MSSP) module supporting SPI and I2C, a USART with addressable RX/TX buffering, two CCP modules, and an 8-bit parallel slave port (PSP). The device operates across an industrial temperature range of -40C to +125C and supports 2.0 V to 5.5 V supply. The enhanced (E) silicon variant provides wider Vdd and temperature tolerances than the baseline part.
Architecturally, the PIC18C452 uses a 16-bit instruction / 8-bit data Harvard architecture with 77 single-word instructions, single-cycle hardware multiplier, and a 32-level deep hardware stack. The CPU fetches a 16-bit instruction in one cycle and operates on 8-bit data via 12 special-function and 11 general-purpose register file banks. Two 8-bit timers and three 16-bit timers provide flexible capture, compare, and PWM event management.
Typical applications include industrial control panels, motor drive front-ends, instrumentation data logging, sensor signal conditioning, and embedded control blocks where the -E/L extended-temperature range and OTP cost model are required. The PIC18C452 is one of the original PIC18 family members; PIC18F452 flash variants are now the mainstream upgrade path with the same peripheral set, so many legacy designs are migrating footprints via drop-in compatible flash siblings.
When designing with this device, verify the supply decoupling network: place a 0.1 uF ceramic close to each Vdd/Vss pair and bulk capacitance on the analog supply AVdd/AVss pins. The MSSP module has a known silicon errata that must be reviewed before production commit.
This page synthesizes distributor pricing, drop-in alternative candidates, and practical design notes drawn from the verified Microchip datasheet - information not aggregated in the datasheet alone.
Drop-in alternatives for PIC18C452T-E/L — 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 PIC18C452T-E/L (same form factor and footprint) — differing in ADC, Operating Temperature, Package, Core, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F452-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4520-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F452-I/P
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18C452-I/L
✅ Drop-In✓ In Stock
$7.94 / Unit
View Datasheet →PIC18C452T-E/L Maximum Ratings & Electrical Characteristics
| Family | PIC18C |
| Series | PIC18C452 |
| Core | PIC 8-bit RISC (Harvard) |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 32 KB (16K x 16) |
| RAM Size | 1.5 KB (1.5K x 8) |
| EEPROM Size | 256 bytes |
| Maximum CPU Speed | 40 MHz / 10 MIPS |
| Instruction Cycle | 100 ns (at 40 MHz) |
| Number of I/O Pins | 33 |
| ADC | 10-bit, up to 8 input channels |
| Timer Modules | 2 x 8-bit + 3 x 16-bit |
| Communication Peripherals | MSSP (SPI/I2C), USART/SCI, PSP (8-bit parallel slave port) |
| CCP Modules | 2 |
| Supply Voltage | 2.0 V to 5.5 V |
| Operating Temperature | -40C to +125C (extended, E suffix) |
| Package / Case | 44-LCC (J-Lead), PLCC-44 |
| Mounting Type | Surface Mount |
| Oscillator Type | External |
| Hardware Multiplier | 8 x 8 single-cycle |
| Hardware Stack | 32-level deep |
| Standard Packaging | Tape & Reel |
| RoHS Status | unknown |
| Mastering SSP (MSSP) Errata | Yes - review silicon errata sheet before production |
PIC18C452T-E/L Pin Configuration
| Pin 1 | RA2/AN2/VREF- — Port A bit 2 / Analog input 2 / ADC negative reference |
| Pin 2 | RA3/AN3/VREF+ — Port A bit 3 / Analog input 3 / ADC positive reference |
| Pin 3 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
| Pin 4 | RA5/AN4/SS — Port A bit 5 / Analog input 4 / SPI slave select |
| Pin 5 | RE0/RD/AN5 — Port E bit 0 / Parallel Slave Port read / Analog input 5 |
| Pin 6 | RE1/WR/AN6 — Port E bit 1 / Parallel Slave Port write / Analog input 6 |
| Pin 7 | RE2/CS/AN7 — Port E bit 2 / Parallel Slave Port chip select / Analog input 7 |
| Pin 8 | OSC1/CLKIN — Oscillator input / external clock input |
| Pin 9 | OSC2/CLKOUT — Oscillator output / clock output |
| Pin 10 | VSS — Ground reference |
| Pin 11 | VDD — Positive supply |
| Pin 12 | RB0/INT0 — Port B bit 0 / External interrupt 0 |
| Pin 13 | RB1/INT1 — Port B bit 1 / External interrupt 1 |
| Pin 14 | RB2/INT2 — Port B bit 2 / External interrupt 2 |
| Pin 15 | RB3/CCP2 — Port B bit 3 / CCP2 module I/O |
| Pin 16 | RB4 — Port B bit 4 |
| Pin 17 | RB5 — Port B bit 5 |
| Pin 18 | RB6/PGC — Port B bit 6 / ICSP clock |
| Pin 19 | RB7/PGD — Port B bit 7 / ICSP data |
| Pin 20 | AVSS — Analog ground |
| Pin 21 | AVDD — Analog positive supply |
| Pin 22 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 23 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer1 oscillator input / CCP2 alternate |
| Pin 24 | RC2/CCP1 — Port C bit 2 / CCP1 module I/O |
| Pin 25 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| Pin 26 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| Pin 27 | RC5/SDO — Port C bit 5 / SPI data out |
| Pin 28 | RC6/TX/CK — Port C bit 6 / USART transmit / USART clock |
| Pin 29 | RC7/RX/DT — Port C bit 7 / USART receive / USART data |
| Pin 30 | RD0/PSP0 — Port D bit 0 / Parallel Slave Port bit 0 |
| Pin 31 | RD1/PSP1 — Port D bit 1 / Parallel Slave Port bit 1 |
| Pin 32 | RD2/PSP2 — Port D bit 2 / Parallel Slave Port bit 2 |
| Pin 33 | RD3/PSP3 — Port D bit 3 / Parallel Slave Port bit 3 |
| Pin 34 | RD4/PSP4 — Port D bit 4 / Parallel Slave Port bit 4 |
| Pin 35 | RD5/PSP5 — Port D bit 5 / Parallel Slave Port bit 5 |
| Pin 36 | RD6/PSP6 — Port D bit 6 / Parallel Slave Port bit 6 |
| Pin 37 | RD7/PSP7 — Port D bit 7 / Parallel Slave Port bit 7 |
| Pin 38 | VSS — Ground reference |
| Pin 39 | VDD — Positive supply |
| Pin 40 | RA0/AN0 — Port A bit 0 / Analog input 0 |
| Pin 41 | RA1/AN1 — Port A bit 1 / Analog input 1 |
| Pin 42 | MCLR/VPP — Master clear reset / Programming voltage input |
| Pin 43 | NC — Not connected (per datasheet PLCC-44 package) |
| Pin 44 | NC — Not connected (per datasheet PLCC-44 package) |
Typical Applications
PIC18C452T-E/L is suitable for 6 applications: Industrial Control Panels, Motor Drive Front-Ends, Instrumentation Data Logging, Sensor Signal Conditioning, Embedded Control Blocks, Legacy Avionics Subsystems.
Industrial Control Panels
The PIC18C452T-E/L's extended -40C to +125C operating range and 33 digital I/O pins make it suitable for industrial control panel front-ends that drive relays, read contactors, and execute discrete-time control loops. Its 10 MIPS throughput handles PID-like control cycles at kHz rates, while the 10-bit ADC samples transducer signals (pressure, temperature) with sufficient resolution for closed-loop feedback. The OTP cost model favors high-volume panel builders who lock firmware once and ship thousands of units without ISP needs.
Recommended
Motor Drive Front-Ends
The PIC18C452T-E/L can host the supervisory state machine for small motor drives: ADC samples current shunts, the 16-bit timer drives PWM carrier generation in concert with one of the two CCP modules, and the USART handles command/status exchange with a master controller. The 100 ns instruction cycle supports 10 kHz PWM update rates while leaving headroom for housekeeping. The MSSP module interfaces to a digital hall-effect sensor chain over SPI, completing the sensor-fusion front-end.
Recommended
Instrumentation Data Logging
With 1.5 KB of RAM and 256 bytes of EEPROM, the PIC18C452T-E/L is well suited to log sensor frames into external storage via SPI. The MSSP module connects directly to an external EEPROM or SD-card front-end, while the 10-bit ADC captures instrumentation signals at the system sampling rate. The 32 KB OTP holds the logging firmware and serialization code, and the USART pumps results out to a host PC when maintenance is performed.
Recommended
Sensor Signal Conditioning
The PIC18C452T-E/L's 10-bit ADC with up to 8 channels, combined with its MSSP for digital sensor readout, supports multi-sensor conditioning hubs in industrial environments. The 33 I/O lines interface to analog front-ends, while two CCP modules generate PWM excitation signals for bridge-type sensors. Running at 10 MIPS, the MCU can poll, filter, and apply linearization in real time before forwarding calibrated readings over the USART.
Recommended
Embedded Control Blocks
As an embedded control block in larger equipment, the PIC18C452T-E/L handles housekeeping, error monitoring, and user-interface tasks while dedicated DSP or FPGA cores handle signal processing. The PSP (8-bit parallel slave port) lets it communicate bidirectionally with a host CPU, while MSSP and USART expose it to a debug/maintenance channel. The -E extended temperature grade and 33 I/O pins support industrial-cabinet deployment without active cooling.
Recommended
Legacy Avionics Subsystems
Because the PIC18C452 family was widely designed into long-life avionics and military subsystems during the late 1990s, the PIC18C452T-E/L is still demanded for spares and form-fit-function replacements on existing equipment. Its -40C to +125C operating range, 33 I/O, and 10-bit ADC satisfy legacy sensor and actuator interfaces. The OTP memory ensures deterministic code that cannot be inadvertently overwritten in field service.
Recommended
Recommended Products Summary
Engineering reference data for PIC18C452T-E/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F452-I/L | PIC18F4520-I/L | PIC18F452-I/P | PIC18C452-I/L |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-LCC (J-Lead) PLCC | 44-LCC (J-Lead) PLCC - same | 44-LCC (J-Lead) PLCC - same | 40-PDIP (different footprint) | 44-LCC (J-Lead) PLCC - same |
| Program Memory | 32 KB OTP | 32 KB flash | 32 KB flash | 32 KB flash | 32 KB OTP |
| RAM Size | 1.5 KB | 1.5 KB | 1.5 KB | 1.5 KB | 1.5 KB |
| Maximum Frequency | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS |
| Operating Temperature | -40C to +125C (E) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) |
| ADC Resolution | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels |
| Lifecycle Status | Obsolete | Active / Mature | Active | Active / Mature | Obsolete |
Key Differentiators
- Extended -40C to +125C industrial temperature grade (vs PIC18C452-I/L)
- Tape & Reel packaging for high-volume SMT assembly (vs PIC18C452-E/L (tray))
- OTP memory at lower per-unit cost versus flash siblings (vs PIC18F452-I/L)
Design Notes
Place a 0.1 uF decoupling capacitor as close as possible to each Vdd/Vss pin pair on the PIC18C452T-E/L, plus a bulk 10 uF tantalum or ceramic on the analog supply rail (AVdd/AVss). The MCU's 33 I/O lines and ADC switching create instantaneous supply transients; insufficient decoupling couples digital noise into the analog reference and corrupts 10-bit ADC readings. Use a star-ground topology tying AVss back to Vss at a single point.
Review the Microchip PIC18C452 silicon errata sheet before committing to production. The MSSP module has documented anomalous behavior that must be handled in firmware. The /E temperature variant must be ordered explicitly when extended -40C to +125C range is required - the /I variant stops at +85C and is a different die test grade.
Route the oscillator pins (OSC1/OSC2) with short traces and a guard ground to minimize EMI pickup. For 40 MHz operation, keep the trace length below 5 mm and place load capacitors within 3 mm of the oscillator pins. The ICSP pins (RB6/PGC, RB7/PGD) must remain accessible in the PCB layout for factory programming of the OTP array.
Separate analog and digital ground planes under the PIC18C452T-E/L. Tie analog inputs (Port A) and the AVdd/AVss pair to the analog plane only; route digital return currents around the analog island. The PLCC-44 socket footprint is recommended for prototype builds to allow swap-out during firmware development; surface-mount soldering requires a hot-air rework station for OTP re-programming iterations.
Compliance Information
Compliance status not explicitly stated in the verified web data; the part predates Microchip's formal RoHS transition for many OTP-MCU lines. AEC-Q100 automotive qualification is not applicable to the PIC18C452 family; choose PIC18F452-I/PT automotive-grade siblings if required.
