PIC16C73B-04/SO - 4MHz 8-Bit OTP MCU, 7KB, 28-SOIC | Microchip
MPN: PIC16C73B-04/SO ✓ פעילPIC16C73B-04/SO סקירה
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (ROM/Flash/OTP for program storage and RAM for data), and programmable I/O peripherals. Within the broader semiconductor taxonomy, MCUs belong to the logic IC family, and the PIC16C7X sits in the mid-range tier of Microchip's 8-bit PIC portfolio, between the baseline PIC10/12/16 families and the enhanced PIC17/18 families. OTP-based parts such as the PIC16C73B were designed for cost-sensitive, low-volume production runs where field reprogrammability was unnecessary.
Key features of the PIC16C73B-04/SO include 35 single-word RISC instructions (all single-cycle except for program branches which take two cycles), a 14-bit instruction word, and a wide operating voltage range of 4.0 V to 5.5 V. The device includes three timers (Timer0 8-bit, Timer1 16-bit, Timer2 8-bit) and offers low-power SLEEP mode with wake-up via external interrupts or Timer1 overflow from an external crystal.
Architecturally, the PIC16C73B employs a Harvard-style RISC core with separate program and data buses, enabling single-cycle instruction fetch from OTP program memory. The 8-bit A/D converter is shared with the analog input pins, and the synchronous serial port's mode is software-configurable at runtime, allowing the same pins to serve either SPI or I²C peripherals.
Typical applications include industrial control systems, sensor signal conditioning with ADC input, motor control via the CCP/PWM modules, and embedded serial-communication bridges using the USART or SPI/I²C. The 28-SOIC footprint is well suited to moderate-density designs that need a balance of integration and through-hole-to-surface-mount migration paths.
When designing with this part, remember that OTP memory can be programmed only once; for development or production code revision cycles, consider the Flash-based PIC16F73 or PIC16F873A pin-compatible successors. Decoupling requires a 0.1 µF ceramic capacitor placed as close as possible to VDD, with a bulk 1-10 µF tantalum or aluminum electrolytic on the same rail.
This page synthesizes current distributor pricing, drop-in PIC16C7X family alternatives, and practical design notes that go beyond the manufacturer datasheet to help engineers select and source the right part for new and legacy designs.
חלופות תחליף ישיר עבור PIC16C73B-04/SO — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם PIC16C73B-04/SO (אותו גורם צורה וטביעת רגל) — שונים ב Package, Timers, A/D Converter, ADC, Core Architecture.
PIC16C73B-04I/SO
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC16C73B-20/SO
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
PIC16C73B-20I/SO
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
PIC16F73-I/SO
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC16F873A-I/SO
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC16C73A-10I/SO
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC16C73B-04/SO דירוגים מרביים ומאפיינים חשמליים
| Core Architecture | PIC16 8-bit RISC (mid-range family) |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4K x 14 words) |
| RAM | 192 bytes |
| Maximum CPU Clock | 4 MHz |
| Instruction Cycle | 200 ns |
| Supply Voltage (VDD) | 4.0 V to 5.5 V |
| I/O Pins | 22 |
| A/D Converter | 8-bit, 5 channels |
| Timers | Timer0 (8-bit), Timer1 (16-bit), Timer2 (8-bit) |
| CCP Modules | 2 (Capture/Compare/PWM) |
| Serial Interfaces | SSP (SPI/I²C), USART |
| Instruction Set | 35 single-word instructions |
| טמפרטורת פעולה | 0°C to +70°C (commercial SO) |
| מארז | 28-pin SOIC (SO, 7.50 mm body) |
| סוג הרכבה | Surface Mount |
| Speed Grade Suffix | -04 = 4 MHz maximum clock |
| סטטוס RoHS | compliant |
תצורת פינים של PIC16C73B-04/SO
| פין 1 | MCLR/VPP — Master clear reset input / programming voltage input |
| פין 2 | RA0/AN0 — Port A bit 0 / analog input channel 0 |
| פין 3 | RA1/AN1 — Port A bit 1 / analog input channel 1 |
| פין 4 | RA2/AN2 — Port A bit 2 / analog input channel 2 |
| פין 5 | RA3/AN3/VREF — Port A bit 3 / analog input channel 3 / ADC reference |
| פין 6 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
| פין 7 | RA5/AN4/SS — Port A bit 5 / analog input channel 4 / SPI slave select |
| פין 8 | OSC1/CLKIN — Oscillator input / external clock input |
| פין 9 | OSC2/CLKOUT — Oscillator output / clock output |
| פין 10 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator output / Timer1 clock input |
| פין 11 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer1 oscillator input / CCP2 output |
| פין 12 | RC2/CCP1 — Port C bit 2 / CCP1 I/O |
| פין 13 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I²C clock |
| פין 14 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I²C data |
| פין 15 | RC5/SDO — Port C bit 5 / SPI data out |
| פין 16 | RC6/TX/CK — Port C bit 6 / USART transmit / USART clock |
| פין 17 | RC7/RX/DT — Port C bit 7 / USART receive / USART data |
| פין 18 | VSS — Ground reference |
| פין 19 | VDD — Positive supply voltage |
| פין 20 | RB0/INT — Port B bit 0 / external interrupt |
| פין 21 | RB1 — Port B bit 1 |
| פין 22 | RB2 — Port B bit 2 |
| פין 23 | RB3/PGM — Port B bit 3 / low-voltage programming input |
| פין 24 | RB4 — Port B bit 4 |
| פין 25 | RB5 — Port B bit 5 |
| פין 26 | RB6/PGC — Port B bit 6 / ICSP clock |
| פין 27 | RB7/PGD — Port B bit 7 / ICSP data |
| פין 28 | VSS — Ground reference (second VSS pin) |
יישומים טיפוסיים
PIC16C73B-04/SO מתאים עבור 6 יישוםs: Industrial Control and Sensor Interfacing, Motor Control with PWM and CCP, Embedded Serial Communication Bridges, Consumer Appliance and White-Goods Control, Automotive Body and Convenience Electronics, Hobby and Educational Embedded Projects.
Industrial Control and Sensor Interfacing
The PIC16C73B-04/SO fits industrial control and sensor interfacing applications because its 5-channel 8-bit ADC (10-bit equivalent on the PIC16F873A) digitizes analog inputs from temperature, pressure, and flow sensors, while 22 I/O lines drive relays, contactors, and indicator LEDs. The 200 ns instruction cycle is fast enough for sampled-data control loops with 1 kHz update rates, and the USART connects to RS-485 transceivers for multi-drop industrial networks. The 4.0-5.5 V supply aligns with the 5 V rails used in PLC backplanes and motor-driver interfaces. Watch for the commercial 0-70 °C limit - the -I suffix variant is mandatory for outdoor cabinets.
מומלץ
Motor Control with PWM and CCP
The PIC16C73B-04/SO is well suited to small DC motor and stepper motor control thanks to its two Capture/Compare/PWM (CCP) modules that generate precise PWM drive signals up to the 4 MHz clock / 4 prescaler limit, equivalent to ~1 kHz PWM at 10-bit resolution. Timer2 provides a configurable PWM time base, and the analog inputs sample motor current or back-EMF for closed-loop control. The 28-SOIC footprint leaves room for gate-driver discretes on a small PCB. Consider the PIC16F873A for higher-frequency BLDC commutation loops needing 20 MIPS throughput.
מומלץ
Embedded Serial Communication Bridges
The PIC16C73B-04/SO serves as a low-cost protocol-bridging MCU because its Synchronous Serial Port (SSP) supports both 3-wire SPI for sensors, EEPROMs, and shift-register I/O expansion, and 2-wire I²C for inter-IC communication with up to 127 nodes on the bus. The independent USART handles asynchronous links to RS-232 or LIN-bus masters. With 7 KB of OTP program memory, the part can hold complete bridging firmware, application state machines, and small protocol stacks. The 28-SOIC form factor is friendly to mixed-signal PCBs that combine analog front-ends with serial peripherals.
מומלץ
Consumer Appliance and White-Goods Control
The PIC16C73B-04/SO targets consumer appliance control (washing machines, dishwashers, microwave ovens, coffee machines) where the 5-channel 8-bit ADC monitors water level, temperature, and door-switch state, the USART drives LED/LCD display modules, and the 22 I/O lines actuate relays, triacs, and buzzer drivers. The 4.0-5.5 V VDD matches rectified-12 V step-down 5 V rails. The OTP memory prevents post-production firmware tampering, an important consideration for safety-certified appliances. For products sold in extreme climates, the -I industrial variant is the right choice.
מומלץ
Automotive Body and Convenience Electronics
The PIC16C73B-04/SO is suitable for non-safety automotive body electronics such as seat controllers, mirror adjusters, sunroof modules, and interior lighting drivers. The 8-bit ADC reads potentiometer wiper voltages and thermistor networks, the PWM modules dim LED strings, and the USART links to body-control modules via LIN bus with an external transceiver. Note that this part is commercial 0-70 °C only, so the -I industrial variant is mandatory for under-hood or cabin deployments where temperatures can exceed 70 °C. The 28-SOIC is friendly to conformal-coated automotive PCBs.
מומלץ
Hobby and Educational Embedded Projects
The PIC16C73B-04/SO is a popular choice in hobbyist and university course work because it exposes a manageable 8-bit RISC architecture (35 instructions) with on-chip ADC, PWM, and both SPI/I²C + USART peripherals, all from a 5 V supply that is forgiving of breadboard wiring mistakes. The 28-SOIC breakout boards and PIC-ICD programmers support quick firmware iteration; for new designs the PIC16F73 or PIC16F873A Flash variants are recommended because the OTP can only be programmed once. Use a 4 MHz ceramic resonator or crystal as the clock source for stable timing.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור PIC16C73B-04/SO — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | PIC16C73B-04I/SO | PIC16C73B-20/SO | PIC16F73-I/SO | PIC16F873A-I/SO | PIC16C73A-10I/SO |
|---|---|---|---|---|---|---|
| Package | 28-SOIC | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max CPU Clock | 4 MHz | 4 MHz | 20 MHz | 20 MHz | 20 MHz | 10 MHz |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 4 KB Flash | 7 KB Flash | 7 KB OTP |
| ADC Resolution | 8-bit, 5 ch | 8-bit, 5 ch | 8-bit, 5 ch | 8-bit, 5 ch | 10-bit, 5 ch | 8-bit, 5 ch |
| Operating Temperature | 0°C to +70°C | -40°C to +85°C | 0°C to +70°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C |
| Reprogrammable | No (OTP) | No (OTP) | No (OTP) | Yes (Flash) | Yes (Flash) | No (OTP) |
| CCP/PWM Modules | 2 | 2 | 2 | 2 | 2 | 2 |
| RAM | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
מבדילים עיקריים
- Lower-cost OTP memory for high-volume mature designs (לעומתPIC16F73-I/SO)
- Wider temperature range variant available in same package (לעומתPIC16C73B-04/SO (commercial) vs PIC16C73B-04I/SO (industrial))
- Flash-based migration path is pin-compatible (לעומתPIC16F873A-I/SO)
הערות תכנון
Place a 0.1 µF ceramic decoupling capacitor as close as possible to the VDD pin (pin 11) and a bulk 1-10 µF tantalum or aluminum electrolytic on the same 5 V rail. For designs using the 28-SOIC, route the second VSS pin (pin 28) to the ground plane directly to reduce ground bounce on ADC channels. The PIC16C73B-04/SO draws typically 2-5 mA active at 4 MHz and <1 µA in SLEEP, so power supply sizing is dominated by peripheral current rather than the MCU itself. Estimated: at 4 MHz and 5 V, the core current is approximately 2 mA per the datasheet typical characteristics.
OTP memory can be programmed only once. Engineers iterating on firmware should NOT use the PIC16C73B-04/SO during development; instead, build the prototype on the Flash-based PIC16F73-I/SO or PIC16F873A-I/SO in the same 28-SOIC footprint, then port the final firmware to the OTP part for production. Another common pitfall is using the standard -04/SO (0-70 °C) in an environment that exceeds 70 °C, such as inside an unenclosed industrial cabinet in summer - the -04I/SO industrial variant is mandatory for that scenario.
Keep the analog inputs (RA0-RA5) traces short and away from digital switching nodes such as the USART TX line or PWM outputs to minimize ADC crosstalk. The A/D conversion accuracy of 8 bits is approximately ±2 LSB at 5 V, equivalent to ±40 mV - sufficient for sensor applications but not for precision instrumentation. For designs needing better than 8-bit ADC accuracy, the PIC16F873A-I/SO with 10-bit ADC is a drop-in alternative in the same 28-SOIC footprint.
Route the MCLR/VPP pin (pin 1) directly to a pull-up resistor to VDD; if a manual reset button is used, add a 100 nF capacitor from MCLR to ground to filter switch bounce. For ICSP (in-circuit serial programming), expose pins RB6/PGC (pin 26) and RB7/PGD (pin 27) on a header to allow field firmware updates during development or service. The oscillator traces for OSC1/OSC2 (pins 13-14) should be short and surrounded by a ground guard ring to reduce EMI susceptibility.
מידע על תאימות
RoHS compliant per Microchip product page. The OTP 28-SOIC variant is not AEC-Q100 qualified; for automotive applications select the PIC16F73T-I/SO industrial Flash variant and validate under AEC-Q100 customer requirements.
