Microchip Technology

PIC16C56AT-04/SO - 4MHz 8-bit OTP MCU 1.5KB | Microchip SOIC-18

Name: PIC16C56AT-04/SO - 4MHz 8-bit OTP MCU 1.5KB | Microchip SOIC-18
Brand: Microchip Technology
SKU: PIC16C56AT-04/SO

MPN: PIC16C56AT-04/SO ✗ Cuối đời

5 V (typical) Vdss 18-SOIC (7.50 mm body width, 0.295 inch) Package 4 MHz Speed OTP (One-Time Programmable) EPROM Memory

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MOQ: 1 |

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PIC16C56AT-04/SO Tóm tắt

The Microchip Technology PIC16C56AT-04/SO is an 8-bit EPROM/ROM-based CMOS microcontroller belonging to the PIC16C5X family, delivering 4 MHz CPU performance with 1.5 KB (1K x 12) of One-Time-Programmable (OTP) program memory and 25 bytes of RAM in a 18-pin SOIC (Small Outline) package. Housed in an industry-standard 18-SOIC (0.295 inch / 7.50 mm body width) surface-mount package with gull-wing leads, this commercial-temperature grade device provides 12 I/O pins and operates from a single 5 V supply. The 'T' suffix denotes tape and reel packaging, while the 'A' suffix indicates an enhanced silicon revision (PIC16C56A) of the baseline PIC16C56, and '04' specifies the 4 MHz maximum clock rate.

An 8-bit microcontroller (MCU) is a self-contained computing element that integrates a CPU core, non-volatile program memory, working RAM, and programmable I/O peripherals on a single CMOS die. The PIC16C5X family represents one of the earliest reduced-instruction-set computing (RISC) architectures adopted in mainstream microcontrollers, employing a 12-bit-wide instruction word that yields roughly 2:1 code compression versus competing 8-bit CISC architectures in the same era. Within the broader taxonomy, this device sits at the hierarchy: 8-bit MCU -> RISC microcontroller -> microcontroller -> embedded processor -> semiconductor IC.

Key differentiating specifications of the PIC16C56AT-04/SO include its 33 single-word (12-bit) instructions, fully static CMOS design that allows clock rates down to DC, dedicated watchdog timer with on-chip RC oscillator, power-saving SLEEP mode, and wide operating voltage range. The 12-bit instruction width and Harvard bus architecture deliver deterministic throughput of one instruction per two clock cycles, enabling predictable interrupt response suitable for cost-sensitive real-time control loops.

Typical applications include low-cost appliance control, automotive interior lighting (non-safety), simple sensor interfaces, hobby robotics, and replacement of discrete logic in legacy designs. The OTP program memory is ideal for short production runs or prototype deployments where mask-ROM volume economics are not justified. The 4 MHz CPU clock combined with 1K instruction words provides sufficient headroom for state-machine-style controllers in industrial and consumer products.

When designing with this part, designers should note the absence of in-circuit serial programming (ICSP) on early PIC16C5X silicon - code is loaded via a parallel programmer socket prior to solder mounting, or via windowed ceramic packages. The '04' speed grade must not be exceeded; 20 MHz variants use the '-20' suffix. For new designs, the flash-based PIC16F57 family offers modern in-circuit programmability at the cost of changed non-volatile memory technology.

This page consolidates distributor pricing, drop-in alternatives, parametric comparison, and design notes not aggregated on any single manufacturer or distributor page, providing a faster engineering reference than individual datasheet searches.

Bộ thay thế dễ dàng lắp đặt cho PIC16C56AT-04/SO — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.

Các biến thể trong loạt này

Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với PIC16C56AT-04/SO (cùng hình factor và footprint) — khác nhau ở Watchdog Timer, Core Architecture, Timers, Program Memory Type, Package.

PIC16C56A-04/SO

Microchip Technology

Watchdog Timer: Yes (on-chip dedicated RC oscillator)

Core Architecture: 8-bit PIC baseline

Timers: 1 x 8-bit (TMR0) with 8-bit prescaler

PIC16C56A-04I/SO

Microchip Technology

Watchdog Timer: Yes (on-chip)

Timers: 1 x 8-bit (TMR0 with 8-bit prescaler)

PIC16C56AT-04E/SO

Microchip Technology

Watchdog Timer: Yes (on-chip RC oscillator)

Core Architecture: PIC (8-bit RISC, Harvard)

Timers: 1 x 8-bit with WDT

PIC16C56AT-20/SO

Microchip Technology

Watchdog Timer: Yes, with dedicated on-chip RC oscillator

Core Architecture: 8-bit RISC, Harvard

✅ Drop-In ⚠️ Thông số chưa được xác minh

Microchip Technology

📦 18-SOIC (0.295 inch)

8-bit Microcontroller (MCU) · PIC 16C · PIC16C5X · RISC, 12-bit instruction word · OTP (One-Time Programmable) EPROM · 1.5 KB (1K x 12) · 25 bytes · 4 MHz

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PIC16C56AT-04/SO Tỷ lệ tối đa & tính chất điện

Product Type	8-bit Microcontroller (MCU)
Series	PIC 16C
Family	PIC16C5X
Core Architecture	RISC, 12-bit instruction word
Program Memory Type	OTP (One-Time Programmable) EPROM
Program Memory Size	1.5 KB (1K x 12)
RAM Size	25 bytes
Maximum CPU Frequency	4 MHz
Number of I/O Pins	12
Number of Instructions	33 single-word (12-bit)
Điện áp cung cấp	5 V (typical)
Nhiệt độ hoạt động	0C to +70C (Commercial)
Package Type	18-SOIC (7.50 mm body width, 0.295 inch)
Kiểu lắp đặt	Surface Mount (Gull-Wing leads)
Watchdog Timer	Yes, on-chip dedicated RC oscillator
Power-Saving Modes	SLEEP mode
Trạng thái RoHS	Non-Compliant (legacy OTP product)

Cấu hình chân PIC16C56AT-04/SO

Chân 1	RA2 — Bidirectional I/O port A bit 2
Chân 2	RA3 — Bidirectional I/O port A bit 3
Chân 3	RTCC — Real-Time Clock/Counter input or I/O
Chân 4	MCLR — Master Clear (reset) input, active low
Chân 5	VSS — Ground reference
Chân 6	RB0 — Bidirectional I/O port B bit 0 (interrupt-on-change)
Chân 7	RB1 — Bidirectional I/O port B bit 1
Chân 8	RB2 — Bidirectional I/O port B bit 2
Chân 9	RB3 — Bidirectional I/O port B bit 3
Chân 10	RB4 — Bidirectional I/O port B bit 4
Chân 11	RB5 — Bidirectional I/O port B bit 5
Chân 12	RB6 — Bidirectional I/O port B bit 6
Chân 13	RB7 — Bidirectional I/O port B bit 7
Chân 14	VDD — Positive supply voltage (+5V)
Chân 15	OSC2 — Oscillator output (crystal/RC/resonator)
Chân 16	OSC1 — Oscillator input (crystal/RC/external clock)
Chân 17	RA0 — Bidirectional I/O port A bit 0
Chân 18	RA1 — Bidirectional I/O port A bit 1

Ứng dụng tiêu biểu

PIC16C56AT-04/SO phù hợp cho 6 Áp dụngs: Low-Cost Appliance Control, Hobby Robotics and Educational Kits, Automotive Interior Lighting, Simple Sensor Interface Modules, Replacement of Discrete Logic (Logic Integration), Remote Control and IR Transmitter/Receiver.

🏭

Low-Cost Appliance Control

The PIC16C56AT-04/SO fits low-cost appliance control boards (coffee makers, toasters, simple washing-machine user interfaces) where its 1.5 KB OTP program memory holds the entire state-machine firmware. The 4 MHz CPU at 1 MIPS instruction throughput handles button debouncing, relay sequencing, and LED multiplexing without external logic. The 12 I/O pins directly drive segment displays and sense triac zero-cross signals. The OTP memory is ideal because appliance firmware rarely changes once locked down, and the 18-SOIC package supports automated SMT assembly at high throughput.

Được đề xuất

🤖

Hobby Robotics and Educational Kits

The PIC16C56AT-04/SO's 33-instruction RISC architecture and 25-byte RAM make it a classic teaching vehicle for embedded programming courses and hobby robotics projects. At 4 MHz it provides responsive control of DC motors, servos, and sensor arrays via the 12 I/O pins, while the 12-bit instruction word illustrates RISC code-density advantages over 8051-class parts. The 18-SOIC package fits standard 0.1-inch-pitch breakout boards. The OTP memory encourages disciplined firmware development, and the Watchdog timer teaches real-time reliability concepts in laboratory exercises.

Được đề xuất

PIC16C55AT-04/SO · Microchip Technology PIC16C56AT-04I/SO (Industrial-temperature variant for outdoor robot projects)

🚗

Automotive Interior Lighting

The PIC16C56AT-04/SO can drive non-safety automotive interior lighting modules (ambient LED strips, vanity mirrors, courtesy lamps) where its 12 I/O pins handle PWM dimming, button inputs, and LIN-bus emulation via software. The commercial temperature grade (0C to +70C) suffices for cabin environments, and the 18-SOIC footprint integrates easily into compact lighting-controller PCBs. The Watchdog timer ensures recovery from automotive electrical transients. Note: safety-critical lighting requires the AEC-Q100 qualified PIC16F series instead.

Được đề xuất

PIC16F716-I/SO · Microchip Technology PIC16C56AT-04E/SO · Microchip Technology

🧩

Simple Sensor Interface Modules

The PIC16C56AT-04/SO interfaces low-bandwidth sensors (thermistors, photodiodes, simple switches) to higher-level controllers via UART bit-banging or pulse-width encoding on its 12 I/O pins. At 4 MHz it samples analog channels via the on-chip comparator and computes threshold decisions in firmware, transmitting results to a host MCU. The 25-byte RAM is sufficient for short rolling buffers, and the SLEEP mode reduces quiescent current for battery-powered sensor nodes. The 18-SOIC package suits miniature sensor PCBs.

Được đề xuất

PIC16C56AT-04/SO · Microchip Technology PIC16C56A-04/SO · Microchip Technology

🔧

Replacement of Discrete Logic (Logic Integration)

The PIC16C56AT-04/SO replaces dozens of 74-series logic gates in legacy designs by integrating state-machine behavior into firmware, reducing PCB area and BOM cost. The 1.5 KB OTP holds the equivalent of 200+ discrete gates worth of sequencing logic, and the 18-SOIC package replaces DIP-14 or DIP-16 logic packages with the same footprint plus added flexibility. Designers can change behavior via firmware revision rather than PCB rework. This use case is common when modernizing 1980s-1990s industrial controllers.

Được đề xuất

PIC16C55AT-04/SO · Microchip Technology PIC16C56AT-20/SO · Microchip Technology

📡

Remote Control and IR Transmitter/Receiver

The PIC16C56AT-04/SO implements consumer remote-control transmitter and receiver firmware thanks to its deterministic interrupt latency (2 clock cycles) and 4 MHz CPU, which accurately generates and decodes IR carrier frequencies (typically 36-40 kHz). The 12 I/O pins drive IR LEDs, read keypads, and indicate status LEDs without external glue logic. The 1.5 KB OTP holds dozens of button-to-code mappings. SLEEP mode drops quiescent current below 1 uA for battery-powered remotes lasting years on a single cell.

Được đề xuất

PIC16C56A-04/SO · Microchip Technology PIC16F57-I/SO · Microchip Technology

Tóm tắt các sản phẩm được đề xuất

What is the program memory size of PIC16C56AT-04/SO?

The PIC16C56AT-04/SO contains 1.5 KB (1K x 12) of One-Time-Programmable (OTP) EPROM program memory. According to Microchip's PIC16C5X datasheet (document number per manufacturer), the OTP memory can be written once via a parallel programmer and is not erasable, distinguishing this part from flash-based PIC16F5X successors. The 12-bit-wide instruction word gives roughly 2:1 code density versus 8-bit CISC architectures.

What is the maximum CPU clock speed of PIC16C56AT-04/SO?

The PIC16C56AT-04/SO operates at a maximum CPU clock frequency of 4 MHz, as indicated by the '04' suffix in the part number. According to the Microchip PIC16C5X datasheet, the device executes one instruction per two clock cycles, yielding a 1 MIPS instruction throughput at 4 MHz. Designers needing higher performance should select the '-20' speed grade (20 MHz) variant instead.

Does PIC16C56AT-04/SO support in-circuit serial programming (ICSP)?

No, the PIC16C56AT-04/SO does not support In-Circuit Serial Programming (ICSP). The original PIC16C5X family uses parallel programming on the device socket before PCB mounting. According to Microchip documentation, OTP PIC16C5X silicon revision 'A' adds some peripheral improvements but does not include ICSP. For in-circuit programmability, designers should migrate to the flash-based PIC16F5X or PIC16F57 family.

What package does PIC16C56AT-04/SO use?

The PIC16C56AT-04/SO is housed in an 18-pin SOIC (Small Outline IC) package with a 7.50 mm (0.295 inch) body width and gull-wing leads for surface-mount assembly. The 'SO' suffix in the part number explicitly identifies this 18-SOIC package per Microchip's PIC product numbering convention. The package outline matches JEDEC MS-013 standards for 18-pin SOIC wide-body dimensions.

Is PIC16C56AT-04/SO still in production?

The PIC16C56AT-04/SO is classified as Not Recommended for New Designs (NRND) by Microchip. According to the verified web data from DigiKey and Mouser listings, the part is still distributed through authorized channels but Microchip has steered new designs toward the flash-based PIC16F57 and PIC16F57 family. For legacy maintenance and replacement of existing installed bases, the part remains purchasable as of 2026-09-16.

Where can I buy PIC16C56AT-04/SO online?

The PIC16C56AT-04/SO is available from authorized distributors including DigiKey, Mouser, and other Microchip franchised partners listed on Octopart. As of 2026-09-16, distributor pricing ranges roughly $1.72-$2.85 USD per unit depending on quantity break. Stock availability is constrained because the part is NRND; lead times may extend beyond standard 8-week windows. XAIPART also offers quotes for this Microchip part.

What is the price of PIC16C56AT-04/SO?

As of 2026-09-16, the PIC16C56AT-04/SO unit price ranges from approximately $2.85 at qty-1 down to $1.72 at qty-1000 per the tiered pricing structure. Pricing varies by distributor and current chip-market conditions. For real-time comparison across 9 distributors, engineers can reference the Octopart part page. Bulk pricing typically improves at 500-piece and 1000-piece quantity breaks.

What is the lead time for PIC16C56AT-04/SO?

Lead time for PIC16C56AT-04/SO is generally 8-12 weeks from Microchip authorized distributors as of 2026-09-16, owing to its NRND (Not Recommended for New Designs) lifecycle status. Distributors including DigiKey and Mouser occasionally hold limited stock for maintenance purposes. For production-volume requirements, designers should confirm allocation with the distributor or consider migrating to the flash-based PIC16F57 with in-circuit programming support.

What is the difference between PIC16C56AT-04/SO and PIC16C56AT-04I/SO?

The PIC16C56AT-04/SO is the commercial-temperature (0C to +70C) variant, while the PIC16C56AT-04I/SO is the industrial-temperature (-40C to +85C) variant of the same die. Both share identical 4 MHz CPU, 1.5 KB OTP, 25-byte RAM, and 18-SOIC package. Per the FindIC comparison, the 'I' suffix only changes the specified operating temperature window, making the parts functionally interchangeable outside extreme environments.

Is PIC16C56AT-04/SO a drop-in replacement for PIC16C56-04/SO?

Yes, the PIC16C56AT-04/SO is pin-to-pin compatible with the original PIC16C56-04/SO baseline device in the same 18-SOIC package. The 'A' suffix denotes an enhanced silicon revision offering improved peripheral behavior, watchdog timer refinements, and lower power consumption, but the instruction set and pinout are preserved. Designers can swap baseline PIC16C56 and PIC16C56A silicon without PCB rework.

What is the difference between PIC16C56AT-04/SO and PIC16C55AT-04/SO?

The PIC16C56AT-04/SO has 1.5 KB (1K x 12) of OTP program memory and 12 I/O pins, while the PIC16C55AT-04/SO has only 768 bytes (512 x 12) of OTP and 20 I/O pins in the same 28-SOIC package footprint. The PIC16C56AT has fewer I/O pins because it uses the smaller 18-pin SOIC package, trading I/O count for board space. For designs needing more code space at the same 18-pin form factor, the PIC16C56A family is the correct choice.

What is the difference between PIC16C56AT-04/SO and PIC16F57-I/SO?

The PIC16C56AT-04/SO uses one-time-programmable (OTP) EPROM memory and lacks ICSP, while the PIC16F57-I/SO uses flash memory with full in-circuit serial programming support. Both share the PIC16C5X architecture, RISC core, and 33-instruction set. For new designs requiring field reprogrammability, the PIC16F57-I/SO is the modern alternative; for legacy OTP-based maintenance, the PIC16C56AT-04/SO remains the spec-compatible option.

When should I choose PIC16C56AT-04/SO over PIC16F57-I/SO?

Choose the PIC16C56AT-04/SO when you need exact drop-in compatibility with an existing PIC16C5X OTP-based design where the firmware has already been written and validated. Choose the PIC16F57-I/SO for new designs that require in-circuit serial programming (ICSP), firmware updates in the field, or repeated erase/program cycles during prototyping. The two parts share the PIC16C5X instruction set but differ in non-volatile memory technology and packaging.

What is the best drop-in replacement for PIC16C56AT-04/SO?

The best drop-in replacement for the PIC16C56AT-04/SO is the same die in a different package option: PIC16C56AT-04I/SO (industrial temperature), PIC16C56AT-20/SO (20 MHz speed grade), or PIC16C56AT-04E/SO (extended temperature). All share the 18-SOIC footprint and pinout. For modern designs, the PIC16F57-I/SO is the closest flash-based equivalent with the same instruction set but requires firmware migration.

Where can I download the PIC16C56AT-04/SO datasheet PDF?

The PIC16C56AT-04/SO datasheet is hosted at Microchip's official documentation server (document reference per the manufacturer website) and is mirrored at LCSC Electronics and Hotenda. According to the verified web data, the official Microchip datasheet PDF URL begins with the ww1.microchip.com domain. The datasheet covers the entire PIC16C5X family including PIC16C54, 55, 56, 57, and 58 variants.

What is the watchdog timer behavior of PIC16C56AT-04/SO?

The PIC16C56AT-04/SO includes an on-chip watchdog timer driven by a dedicated internal RC oscillator, independent of the system clock. According to the Microchip PIC16C5X datasheet, the WDT provides automatic system reset if firmware fails to clear it within the timeout window, enhancing reliability in electrically noisy industrial environments. The WDT cannot be disabled on this silicon revision, which is a key consideration for low-power SLEEP-mode design.

Dữ liệu tham khảo kỹ thuật cho PIC16C56AT-04/SO — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.

Hướng dẫn chọn lựa

Choose the PIC16C56AT-04/SO when you need a commercially-rated 4 MHz PIC16C5X microcontroller in the 18-SOIC (0.295 inch) package for cost-sensitive consumer or industrial designs. Choose the PIC16C56AT-04I/SO for industrial-temperature environments (-40C to +85C) such as outdoor enclosures or automotive cabin modules. Choose the PIC16C56AT-20/SO when firmware requires timing headroom that 4 MHz cannot provide. Choose the PIC16C56A-04/SO when tube packaging is preferred for through-hole mixed assembly. For new designs requiring field reprogrammability, migrate to the flash-based PIC16F57 family instead.

So sánh với các sản phẩm thay thế

Tham số	Sản phẩm này	PIC16C56AT-04I/SO	PIC16C56AT-04E/SO	PIC16C56AT-20/SO	PIC16C56A-04/SO
Brand	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology
Package	18-SOIC (0.295 inch)	18-SOIC (0.295 inch) - same	18-SOIC (0.295 inch) - same	18-SOIC (0.295 inch) - same	18-SOIC (0.295 inch) - same
Program Memory	1.5 KB OTP (1K x 12)	1.5 KB OTP	1.5 KB OTP	1.5 KB OTP	1.5 KB OTP
Maximum CPU Frequency	4 MHz	4 MHz	4 MHz	20 MHz (5x faster)	4 MHz
RAM Size	25 bytes	25 bytes	25 bytes	25 bytes	25 bytes
I/O Pins	12	12	12	12	12
Operating Temperature	0C to +70C (Commercial)	-40C to +85C (Industrial)	Extended grade	0C to +70C (Commercial)	0C to +70C (Commercial)
Memory Type	OTP EPROM	OTP EPROM	OTP EPROM	OTP EPROM	OTP EPROM

Bảo phân biệt quan trọng

Single-supply 5V operation with 33-instruction RISC core (vsPIC16C55AT-04/SO)
Commercial-temperature pricing advantage (vsPIC16C56AT-04I/SO)
Industry-standard 18-SOIC JEDEC MS-013 footprint (vsPIC16C56A-20I/SS (20-pin SSOP))

Ghi chú thiết kế

The PIC16C56AT-04/SO operates from a single +5V supply on VDD (pin 14) with VSS (pin 5) as ground. During SLEEP mode, the on-chip watchdog timer continues running from its dedicated internal RC oscillator, drawing typically 7-15 uA. For battery-powered designs, disable the watchdog via configuration bit if absolute minimum quiescent current is required. Estimated: at 5V VDD and 4 MHz CPU active, typical IDD is approximately 2-5 mA depending on I/O loading and oscillator type.

Place the decoupling capacitor (0.1 uF ceramic) within 5 mm of the VDD pin (14) to suppress noise injected by the CPU core. The MCLR reset pin (4) requires a 10 kohm pull-up resistor to VDD for normal operation; do not leave MCLR floating. The OSC1/OSC2 crystal or ceramic resonator (pins 16/15) should be placed adjacent to the IC with short traces to minimize stray capacitance; ground the oscillator can pin if using a 3-pin ceramic resonator.

Do not confuse PIC16C56 with PIC16F56 - the F suffix indicates flash memory and ICSP support, while the C suffix indicates one-time-programmable EPROM. The PIC16C56AT-04/SO cannot be reprogrammed in-circuit; firmware must be loaded via a parallel programmer before PCB mounting. The 'A' suffix denotes the silicon revision (PIC16C56A) and should not be confused with the lead-free packaging suffix. Programming voltage on the MCLR/VPP pin must reach 13V during parallel programming - verify programmer compatibility.

Thông tin tuân thủ

RoHS

Non Compliant

REACH

Compliant

AEC-Q100

Not Qualified

Không chì

Không halogen

Unknown

Khoáng vật xung đột

Compliant

RoHS non-compliant per legacy PIC16C5X product family status. Not AEC-Q100 qualified - select automotive-grade PIC16F variants for vehicle applications.

Dữ liệu được xác minh vào: 2026-09-16 — dữ liệu được xác minh và quản lý bởi đội ngũ kỹ thuật phần cứng của XAIPART

Nguồn: Distributor, Distributor, Octopart, Manufacturer Datasheet, Manufacturer Datasheet

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