PIC16C433T-I/SO - 8-bit PIC MCU 10MHz 3.5KB OTP 18-SOIC | Microchip
MPN: PIC16C433T-I/SO ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.62 | $26.20 |
| 100 | $2.31 | $231.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.85 | $1,850.00 |
PIC16C433T-I/SO Overview
A PIC16 microcontroller is a Harvard-architecture RISC device: separate program and data buses, a small fixed instruction set, and most instructions executing in a single oscillator cycle. PIC16C-series parts use EPROM/OTP program memory, meaning the device can be programmed once at production time and the code is permanently retained, which suits low-cost, high-volume consumer and appliance designs where flash re-programmability is not required. The C-class PIC16 is positioned below the F-class (Flash) siblings in the same family tree (PIC16 -> PIC mid-range -> 8-bit MCU -> microcontroller).
Key features include 10 MHz maximum operating frequency, 128 bytes of RAM, 5 I/O pins (PIC16C433 exposes a 6-pin I/O set per the family, but in this /SO variant 5 are bonded out), internal oscillator support, 5V typical operation, and an instruction set fully compatible with the broader PIC16 mid-range family. The OTP EPROM die is mature and well-characterized, making the part suitable for legacy industrial controllers and cost-down retrofits of older designs.
PIC16C433 belongs to the PIC16C4x sub-family of mid-range microcontrollers. Architecturally it shares the same core as PIC16C54/55/56/57/58 devices, with extended program memory addressing to reach 2K x 14 of code space. The on-chip peripherals are intentionally minimal - this is a low-I/O-count, low-cost device aimed at simple digital control tasks. Power consumption is typical for the OTP EPROM process node.
Typical applications include simple timer/replacement logic, low-cost consumer appliance controls, toys and educational boards, sensor-signal processing front-ends, motor-control signal generators, and any application where a one-time-programmed 8-bit MCU with a small code footprint is acceptable. The 18-SOIC form factor makes it well-suited for through-hole-style PCBs converted to surface-mount, or for retrofit boards that require the SO-18 footprint.
When designing with this device, note that OTP means field upgrades are impossible - firmware must be finalized before programming. Always provide adequate Vdd decoupling (100 nF + bulk) close to the IC, and respect the oscillator start-up time when MCLR reset is released.
This page synthesizes distributor pricing, drop-in alternative pinouts, and practical design notes not present in the standalone manufacturer datasheet, including cross-references to the /SO and /P variants.
Drop-in alternatives for PIC16C433T-I/SO — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C433-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C433-04I/SO
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16C432T-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C434T-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F433-I/SO
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16C433T-I/SO Maximum Ratings & Electrical Characteristics
| Core | PIC16C - 8-bit RISC |
| Program Memory Size | 3.5 KB (2K x 14) OTP EPROM |
| RAM Size | 128 bytes |
| Maximum Clock Frequency | 10 MHz |
| Operating Voltage (Vdd) | 5 V typical (PIC16C family range) |
| Number of I/O Pins | 5 (SO-18 bonded) |
| Package / Case | 18-SOIC (0.295 inch / 7.50 mm width) |
| Mounting Type | Surface Mount |
| Oscillator Type | Internal (RC) supported |
| Operating Temperature Range | -40C to +85C (Industrial, 'I' suffix) |
| Architecture | Harvard, 14-bit instruction word |
| Instruction Set | PIC16 mid-range (single-cycle) |
| Memory Type | OTP EPROM (One-Time-Programmable) |
| Series | PIC PIC 16C |
| Packaging | Tape & Reel ('T' suffix) |
PIC16C433T-I/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 — Bidirectional I/O port A bit 4 (also T0CKI input) |
| Pin 4 | RA5 — Bidirectional I/O port A bit 5 |
| Pin 5 | Vss — Ground reference |
| Pin 6 | RB0 — Bidirectional I/O port B bit 0 (INT input) |
| 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 (ICSCLK) |
| Pin 13 | RB7 — Bidirectional I/O port B bit 7 (ICSDAT) |
| Pin 14 | Vdd — Positive supply (5 V typical) |
| Pin 15 | OSC2 — Oscillator output / CLKR |
| Pin 16 | OSC1 — Oscillator input / CLKIN |
| Pin 17 | RA0 — Bidirectional I/O port A bit 0 |
| Pin 18 | RA1 — Bidirectional I/O port A bit 1 |
Typical Applications
PIC16C433T-I/SO is suitable for 6 applications: Simple Appliance Control, Toy and Educational Electronics, Legacy Industrial Controller Retrofit, Sensor Signal Pre-Processing Front-End, Motor Control Signal Generator, Consumer Remote / IR Transmitter.
Simple Appliance Control
The PIC16C433T-I/SO fits simple appliance control loops where a one-time-programmed 8-bit MCU is acceptable: its 3.5 KB (2K x 14) OTP EPROM holds a small state-machine controller for toaster ovens, fan controllers, and rice cookers; its 5 bonded-out I/O in the SOIC-18 footprint are sufficient for keypad scan plus relay or triac drive; and the 10 MHz core runs a 4 ms scheduler fast enough for closed-loop temperature or timer logic. Versus a Flash PIC16F433 the OTP die lowers BOM cost per unit; versus a small 32-bit MCU the 8-bit RISC core draws less quiescent current.
Recommended
Toy and Educational Electronics
For hobby-grade toys, learning labs, and educational electronics kits the PIC16C433T-I/SO is a low-cost PIC16 mid-range controller: 3.5 KB of OTP EPROM can store interactive sound/light sequencing code, 128 bytes of RAM holds the runtime state, and the 10 MHz core keeps response latency under 50 microseconds for tactile feedback. The industrial -40C to +85C rating of the 'I' suffix ensures classroom reliability. Drop-in compatibility with PIC16F433-I/SO lets developers prototype on Flash and then switch to OTP for the production run at lower unit cost.
Recommended
Legacy Industrial Controller Retrofit
Industrial maintenance engineers retrofitting legacy controllers find the PIC16C433T-I/SO useful when the original factory used the same die: 18-SOIC surface-mount footprint fits modernized PCB layouts, the industrial -40C to +85C temperature range survives factory-floor environments, and the OTP EPROM is exactly the original memory type so firmware-imaged replacements preserve deterministic boot behavior. The 5 bonded I/O in the SO-18 package can directly drive opto-isolated inputs or solid-state relays. Pinout is shared with the PIC16C432/PIC16C434 sub-family, simplifying cross-stock procurement when one variant is exhausted.
Recommended
Sensor Signal Pre-Processing Front-End
Use the PIC16C433T-I/SO as a pre-processing front-end for analog sensors before handing filtered data to a host controller: the 8-bit PIC16 RISC core can run a 1 kHz sample-rate digital filter inside its 3.5 KB OTP program space, the 128 bytes of RAM is enough for a moving-average buffer, and the 10 MHz clock executes ~5 MIPS giving sub-millisecond response. Industrial temperature rating is appropriate for outdoor sensor hubs. The /SO 7.50 mm wide-body SOIC is comfortable to hand-solder in lab prototypes, and the Flash-based PIC16F433-I/SO drop-in alternative lets the firmware team iterate filters quickly during development.
Recommended
Motor Control Signal Generator
Small brushed DC or stepper motor controllers use the PIC16C433T-I/SO as a commutation/PWM signal generator: the 10 MHz core can produce a 20 kHz PWM with 8-bit duty resolution for motor speed control, the 5 I/O pins are sufficient for direction, brake, enable and a tachometer input, and the OTP EPROM locks the safety logic at production time so it cannot be modified in the field. The SO-18 footprint sits comfortably next to an H-bridge driver. For development, the PIC16F433-I/SO Flash sibling is software-compatible and lets engineers tune PID coefficients before locking them into the OTP production part.
Recommended
Consumer Remote / IR Transmitter
A simple IR remote or RF transmitter only needs to encode a few bytes per button press - exactly what the PIC16C433T-I/SO is sized for: 3.5 KB OTP holds the protocol stack and key-scanning state machine, 128 bytes of RAM stores the transmit buffer, and the 10 MHz core produces a clean 38 kHz carrier for IR or a stable OOK pattern for sub-GHz RF. Five I/O is enough for a 5-button keypad plus a transmit LED driver. The SOIC-18 7.50 mm body fits inside a slim remote housing. Migrating to PIC16F433-I/SO is straightforward when firmware updates are needed mid-production.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C433T-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C433-I/SO | PIC16C433-04I/SO | PIC16C432T-I/SO | PIC16C434T-I/SO | PIC16F433-I/SO |
|---|---|---|---|---|---|---|
| Package | SOIC-18 (7.50 mm wide) | SOIC-18 (7.50 mm wide) - same | SOIC-18 (7.50 mm wide) - same | SOIC-18 (7.50 mm wide) - same | SOIC-18 (7.50 mm wide) - same | SOIC-18 (7.50 mm wide) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | 8-bit PIC16 mid-range RISC | 8-bit PIC16 mid-range RISC - same | 8-bit PIC16 mid-range RISC - same | 8-bit PIC16 mid-range RISC - same | 8-bit PIC16 mid-range RISC - same | 8-bit PIC16 mid-range RISC - same |
| Program Memory | 3.5 KB (2K x 14) OTP EPROM | 3.5 KB (2K x 14) OTP EPROM | 3.5 KB (2K x 14) OTP EPROM | 1.75 KB (1K x 14) OTP EPROM (-50%) | 7 KB (4K x 14) OTP EPROM (+100%) | 2 KB (1K x 14) Flash (re-programmable) |
| RAM Size | 128 bytes | 128 bytes - same | 128 bytes - same | 64 bytes (-50%) | 192 bytes (+50%) | 128 bytes - same |
| Max Clock Frequency | 10 MHz | 10 MHz - same | 4 MHz (-60%) | 10 MHz - same | 10 MHz - same | 10 MHz - same |
| Memory Type | OTP EPROM | OTP EPROM - same | OTP EPROM - same | OTP EPROM - same | OTP EPROM - same | Flash (re-programmable) |
| Temperature Range | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
Key Differentiators
- Industrial -40C to +85C temperature rating on the 'I' suffix (vs PIC16C433T/SO (commercial grade))
- Larger program memory than the PIC16C432 sub-family (vs PIC16C432T-I/SO)
- Tape-and-reel packaging for high-volume SMT assembly (vs PIC16C433-I/SO (tube))
Design Notes
Provide a 100 nF ceramic decoupling capacitor as close as possible to the Vdd pin (pin 14) with a short trace to the Vss pin (pin 5). Add a bulk electrolytic (4.7 uF to 22 uF) at the regulator output near the MCU. The PIC16C433 EPROM cell is sensitive to Vdd droop during flash erase/program cycles; for development, an oscilloscope check across Vdd during MCLR reset is recommended.
OTP EPROM is one-time-programmable only - firmware must be 100% verified before production programming. There is no field upgrade path. For development cycles, prototype on the Flash-based PIC16F433-I/SO, which shares the same SOIC-18 footprint and PIC16 mid-range instruction set, then switch to PIC16C433T-I/SO for the OTP production run once firmware is locked.
The SOIC-18 (7.50 mm wide-body) footprint is hand-solderable but production boards should use a fine-pitch stencil for solder paste. Keep the MCLR pin trace short (<25 mm) to minimize noise pickup; add a 10 kohm pull-up and a 100 nF cap-to-ground to ensure clean reset transitions. Avoid routing the OSC1/OSC2 traces near high-current switching nodes to reduce oscillator jitter.
Compliance Information
RoHS and REACH status not explicitly stated in the provided distributor data and the part is marked obsolete; flagged [DATA_NEEDED] in specs. AEC-Q100 not applicable - this is a Microchip 8-bit legacy MCU, not an automotive-qualified part. Conflict-minerals declaration per Microchip's standard policy.
