PIC16C57T-10/SO - 8-Bit 10MHz OTP MCU 3KB | Microchip
MPN: PIC16C57T-10/SO ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.95 | $3.95 |
| 10 | $3.55 | $35.50 |
| 100 | $3.15 | $315.00 |
| 500 | $2.8 | $1,400.00 |
| 1,000 | $2.45 | $2,450.00 |
PIC16C57T-10/SO Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (program + data), and programmable I/O peripherals on one die, enabling compact, low-cost embedded control. The PIC16C5X sits within the broader hierarchy: microcontroller -> embedded processor -> semiconductor -> integrated circuit. OTP (One-Time-Programmable) program memory means the firmware is written once at production time and cannot be erased, which lowers per-unit cost compared to Flash-based parts at the expense of field-upgradability.
Key features include 2:1 code compression from its 12-bit orthogonal instruction set, 33 single-word/single-cycle instructions (except for program branches which are two-cycle), a fully static design supporting DC operation, and a wide operating voltage range of 2.0V to 6.25V. The 28-SOIC wide-body footprint provides easier hand-soldering and stronger thermal performance than the SSOP variant, while the integrated WDT and POR eliminate external supervisory components and reduce BOM cost.
The PIC16C57T-10/SO is engineered around Microchip's classic PIC16C5X RISC architecture, which separates program and data buses (Harvard architecture) and uses a 12-bit instruction word to balance code density with execution speed. The 10 MHz oscillator input yields a 100 ns instruction cycle, sufficient for slow-control applications such as keypad scanning, simple sensor interfacing, and LED multiplexing.
Typical applications include consumer appliance controllers, low-end automotive body electronics, battery chargers, simple sensor signal conditioning, HVAC fan controllers, and educational/hobbyist microcontroller platforms. The wide 28-SOIC package simplifies prototyping on through-hole adapter boards for both hobbyists and engineers validating legacy designs.
When designing with this part, note that OTP memory cannot be re-programmed in-circuit - firmware must be fully validated before committing. The 10 MHz speed grade is appropriate for sub-1 MIPS control tasks; designers needing higher throughput should consider PIC16C55A or PIC16C57C variants operating at 20 MHz or 40 MHz. Always consult Microchip's PIC16C5X datasheet and PinPack compatibility chart (DS00148J2) for cross-family pin and code equivalence.
This page synthesizes distributor pricing, drop-in same-package alternatives from the PIC16C5X family, lifecycle status, and practical design notes not found in a single manufacturer document - supporting both new designs and the maintenance of legacy PIC16C5X installations.
Drop-in alternatives for PIC16C57T-10/SO — 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 PIC16C57T-10/SO (same form factor and footprint) — differing in Core Architecture, Package, Timers, Operating Temperature, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C57C-20/SO
✅ Drop-In✓ In Stock
$2.89 / Unit
View Datasheet →PIC16C57C-04/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C57T-20/SO
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16C57T-40/SO
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16C57C-20E/SO
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.55 / Unit
View Datasheet →PIC16C56T-XT/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C57T-10/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC |
| Family | PIC® 16C |
| Program Memory Type | OTP (One-Time-Programmable EPROM) |
| Program Memory Size | 3 KB (2K x 12) |
| Data RAM | 72 bytes |
| Maximum Clock Frequency | 10 MHz |
| Instruction Cycle | 100 ns (4 clock periods per instruction cycle) |
| Operating Voltage Range | 2.0 V to 6.25 V |
| I/O Pins | 20 |
| Timers | 1 x 8-bit Timer/Counter |
| Watchdog Timer (WDT) | Yes (integrated, on-chip RC oscillator) |
| Power-On Reset (POR) | Yes |
| Brown-Out Reset (BOR) | No |
| Operating Temperature Range | 0C to +70C (commercial grade) |
| Package | 28-pin SOIC (SO), wide-body, 7.50 mm |
| Mounting Type | Surface Mount (SMT, gull-wing) |
| Process Technology | CMOS EPROM-based |
| RoHS Status | unknown - legacy OTP EPROM family |
| Instruction Set Width | 12-bit, 33 instructions, 2:1 code compression vs 8-bit CISC |
| Programming Method | Parallel programming via Microchip PM3 device programmer |
PIC16C57T-10/SO Pin Configuration
| Pin 1 | RA2 — PORTA bit 2, digital I/O |
| Pin 2 | RA3 — PORTA bit 3, digital I/O |
| Pin 3 | RTCC — Timer/counter RTCC clock input (also PORTA bit 4) |
| Pin 4 | MCLR — Master Clear reset input, active low |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0 — PORTB bit 0, digital I/O |
| Pin 7 | RB1 — PORTB bit 1, digital I/O |
| Pin 8 | RB2 — PORTB bit 2, digital I/O |
| Pin 9 | RB3 — PORTB bit 3, digital I/O |
| Pin 10 | RB4 — PORTB bit 4, digital I/O |
| Pin 11 | RB5 — PORTB bit 5, digital I/O |
| Pin 12 | RB6 — PORTB bit 6, digital I/O |
| Pin 13 | RB7 — PORTB bit 7, digital I/O |
| Pin 14 | VSS — Ground reference (per datasheet) |
| Pin 15 | OSC1 — Oscillator input |
| Pin 16 | OSC2 — Oscillator output |
| Pin 17 | RC0 — PORTC bit 0, digital I/O |
| Pin 18 | RC1 — PORTC bit 1, digital I/O |
| Pin 19 | RC2 — PORTC bit 2, digital I/O |
| Pin 20 | RC3 — PORTC bit 3, digital I/O |
| Pin 21 | RC4 — PORTC bit 4, digital I/O |
| Pin 22 | RC5 — PORTC bit 5, digital I/O |
| Pin 23 | RC6 — PORTC bit 6, digital I/O |
| Pin 24 | RC7 — PORTC bit 7, digital I/O |
| Pin 25 | RA0 — PORTA bit 0, digital I/O |
| Pin 26 | RA1 — PORTA bit 1, digital I/O |
| Pin 27 | NC — Not connected (per datasheet) |
| Pin 28 | VDD — Positive supply voltage |
Typical Applications
PIC16C57T-10/SO is suitable for 6 applications: Consumer Appliance Timer, Battery Charger Controller, HVAC Fan and Blower Controller, Industrial Sensor Interface Module, Educational Microcontroller Trainer, Automotive Body Electronics (Legacy).
Consumer Appliance Timer
The PIC16C57T-10/SO is well suited to consumer appliance timer circuits such as washing-machine cycle controllers, microwave oven timers, and dishwasher state machines. The 3 KB (2K x 12) OTP program memory accommodates multi-stage state machines with mode selection, while the integrated 8-bit timer/counter and 20 digital I/O lines drive relays, triac optocouplers, and 7-segment displays without external logic. The 10 MHz clock delivers a 100 ns instruction cycle that is more than adequate for human-scale timing resolution (seconds-to-minutes). The wide 28-SOIC package simplifies hand-soldering during prototyping of appliance control boards, and the 2.0V-6.25V operating range covers both 3.3V and 5V designs. Cost-sensitive appliance OEMs benefit from the OTP pricing model: parts are programmed once at production with no field-upgrade capability, eliminating support overhead.
Recommended
Battery Charger Controller
Low-end NiCd/NiMH battery charger designs leverage the PIC16C57T-10/SO's small footprint, integrated Watchdog Timer, and 20 I/O lines to implement CC/CV charge profiles with temperature monitoring. The 2.0V-6.25V operating range is well matched to single-cell and multi-cell battery packs without additional level shifting. The integrated WDT protects against firmware lockup in long-charge (overnight) applications, while the integrated Power-On Reset eliminates the need for an external brown-out supervisor. The 72 bytes of RAM accommodate state variables for cell voltage, temperature, and time-of-charge without external memory. Engineers designing multi-chemistry smart chargers should note that the OTP memory prevents firmware updates after product release - all charge algorithms must be fully validated on the engineering bench before committing to a production programming batch.
Recommended
HVAC Fan and Blower Controller
Residential and light-commercial HVAC fan controllers benefit from the PIC16C57T-10/SO's combination of 20 digital I/O lines, integrated WDT, and wide 28-SOIC footprint that simplifies hand-rework in field service. The PIC16C5X 12-bit instruction set provides 2:1 code density over competing 8-bit CISC MCUs, allowing complex fan-speed curves, hysteresis logic, and fault detection to fit in the 3 KB OTP memory. The 100 ns instruction cycle at 10 MHz easily supports PWM generation for triac-fired blower motors at 50/60 Hz line frequencies with comfortable timing margin. Designers should add external EMI filtering on the I/O lines driving triacs and optoisolators to meet FCC/CE EMC requirements for HVAC equipment, since the PIC16C57 lacks integrated slew-rate control.
Recommended
Industrial Sensor Interface Module
The PIC16C57T-10/SO provides a cost-effective MCU for industrial sensor interface modules that multiplex 4-20 mA analog loops, digital switch inputs, and Modbus-style serial outputs. Its 20 digital I/O lines comfortably handle 8 sensor inputs, 4 control outputs, 2 serial lines (TX/RX), and indicator LEDs. The integrated WDT provides automatic recovery from firmware lockup in unattended industrial installations, a key requirement for factory-floor reliability. The wide 28-SOIC package is preferred over SSOP for industrial environments where mechanical robustness and ease of hand-repair are valued. Designers should note the lack of an integrated ADC - external ADC ICs such as the MCP3001 are required for any analog channel, which adds BOM cost but allows selection of the optimal ADC resolution per channel.
Recommended
Educational Microcontroller Trainer
Universities, technical colleges, and self-taught hobbyists use the PIC16C57T-10/SO in microcontroller trainer boards because the 28-SOIC wide-body package is easy to socket and hand-solder, and the PIC16C5X architecture has the simplest instruction set in Microchip's PIC family (33 instructions, all single-word except branches). The 10 MHz oscillator with a 100 ns instruction cycle is slow enough for students to single-step through code on logic analyzers and trace program-counter movement with basic equipment. The 20 I/O lines map cleanly to breadboard-friendly pin assignments (8-bit PORTB and PORTC plus 4-bit PORTA), supporting classic labs such as LED chasers, keypad scanners, and 7-segment display multiplexing. While the OTP memory cannot be re-programmed by students,Microchip provides ceramic-windowed JW-package variants of the same PIC16C57 die for UV-erasable development work.
Recommended
Automotive Body Electronics (Legacy)
The PIC16C57T-10/SO was historically used in low-end automotive body-electronics modules such as mirror controllers, simple lighting timers, and seat-position memory, though its commercial 0C to +70C rating limits modern automotive use. For new designs, the automotive-grade PIC16C57T-10I/SO (industrial -40C to +85C) or AEC-Q100-qualified parts from the PIC16F family are preferred. The 3 KB OTP memory holds typical body-controller state machines, and the WDT/POR combination provides reliable cold-start behavior in automotive voltage environments. The 28-SOIC footprint remains a popular choice for automotive PCB assembly because of its compatibility with automated pick-and-place and wave-solder processes. Designers should always validate that the operating temperature grade (commercial vs industrial) matches the target automotive compartment: under-hood requires -40C to +125C, while passenger-compartment can sometimes accept -40C to +85C.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C57T-10/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C57C-20/SO | PIC16C57C-04/SO | PIC16C57T-20/SO | PIC16C57T-40/SO | PIC16C56T-XT/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (SO, wide-body) | 28-SOIC (SO, wide-body) - same | 28-SOIC (SO, wide-body) - same | 28-SOIC (SO, wide-body) - same | 28-SOIC (SO, wide-body) - same | 28-SOIC (SO, wide-body) - same |
| Maximum Clock Frequency | 10 MHz | 20 MHz | 4 MHz | 20 MHz | 40 MHz | 4 MHz |
| Program Memory | 3 KB (2K x 12) OTP | 3 KB (2K x 12) OTP - same | 3 KB (2K x 12) OTP - same | 3 KB (2K x 12) OTP - same | 3 KB (2K x 12) OTP - same | 1.5 KB (1K x 12) OTP -50% |
| Data RAM | 72 bytes | 72 bytes - same | 72 bytes - same | 72 bytes - same | 72 bytes - same | 72 bytes - same |
| I/O Pins | 20 | 20 - same | 20 - same | 20 - same | 20 - same | 20 - same |
| Operating Temperature | 0C to +70C (commercial) | 0C to +70C (commercial) | 0C to +70C (commercial) | 0C to +70C (commercial) | 0C to +70C (commercial) | 0C to +70C (commercial) |
| Watchdog Timer | Yes (integrated) | Yes (integrated) - same | Yes (integrated) - same | Yes (integrated) - same | Yes (integrated) - same | Yes (integrated) - same |
Key Differentiators
- PIC16C5X family member with classic 12-bit instruction set and 2:1 code compression (vs PIC16C56T-XT/SO)
- Commercial temperature grade suits consumer and educational applications (vs PIC16C57C-20E/SO (extended temperature))
- 10 MHz speed grade is software-upgradable to PIC16C57T-20/SO or -40/SO without firmware changes (vs PIC16C55T-10/SO (different die))
Design Notes
The PIC16C57T-10/SO uses One-Time-Programmable (OTP) EPROM, which means firmware cannot be re-programmed or field-upgraded after the device is programmed at the factory. All firmware bugs and timing issues must be fully resolved on engineering samples (use a JW-windowed or -ICE emulator for development) before committing to a production programming batch. Once programmed, a defective firmware image requires scrapping the MCU and re-programming a new device, which adds cost in field service.
The PIC16C57T-10/SO integrates both a Power-On Reset (POR) and a Watchdog Timer (WDT) with its own dedicated internal RC oscillator, but it does NOT include Brown-Out Reset (BOR). For 5V rails from unregulated supplies or in automotive load-dump environments, add an external voltage supervisor (such as MCP100 or MCP809) on the MCLR pin to guarantee clean reset behavior when VDD dips below the POR threshold. Without BOR, VDD brown-outs can leave register contents in undefined states, leading to firmware mis-execution on power recovery.
The PIC16C57T-10/SO is highly tolerant of PCB layout but for reliable oscillator operation keep the OSC1/OSC2 traces short and surrounded by a ground pour. When using a crystal resonator, place the load capacitors within 5 mm of the OSC pins and use a guard ring tied to VSS to minimize EMI pickup from adjacent switching traces. For low-power RC-oscillator designs, the internal 4 MHz RC is sufficient; for designs needing precise baud-rate generation, use an external 10 MHz crystal rather than the internal oscillator.
Compliance Information
PIC16C57 family is a legacy EPROM-based OTP family; full material-composition declarations may not be available on Microchip's product page. The standard part is NOT AEC-Q100 qualified; for automotive use, contact Microchip for the PIC16C57T-10I/SO industrial-temperature variant.
