PIC16LC74A-04I/PT - 8-Bit MCU, 4MHz, 7KB OTP, 44-TQFP | Microchip
Référence : PIC16LC74A-04I/PT ✗ Fin de vie| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $5.42 | $5,42 |
| 10 | $4.89 | $48,90 |
| 100 | $4.32 | $432,00 |
| 500 | $3.78 | $1 890,00 |
| 1 000 | $3.35 | $3 350,00 |
PIC16LC74A-04I/PT Présentation
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/Flash/OTP), data memory (RAM), I/O peripherals, and often timers, communication interfaces, and analog blocks. The PIC16C family sits within Microchip's mid-range architecture (14-bit instruction word), providing a balance of code density, peripheral integration, and deterministic interrupt response. Microcontrollers sit within the broader taxonomy of embedded processors -> microcontrollers -> 8-bit microcontrollers -> CMOS microcontrollers -> mid-range MCUs.
Key features of the PIC16LC74A-04I/PT include its 4 MHz maximum oscillator frequency, integrated 8-bit A/D converter, USART/SCI and SSP (SPI/I2C) communication peripherals, multiple 8/16-bit timer modules, and 33 digital I/O lines. The wide operating voltage range and CMOS process yield low current typical draw at full operation, making it suitable for battery-powered and industrial applications.
Architecturally, the PIC16LC74A uses a Harvard RISC core with 14-bit-wide instructions and 8-bit-wide data, allowing single-cycle instruction execution except for branches (2 cycles). The OTP program memory supports one-time programming for low-volume or production units where code stability is paramount, while the on-chip peripherals are mapped via a banked register architecture familiar to PIC mid-range developers.
Typical applications include industrial control systems, automotive subsystems (non-safety-critical), appliance controls, sensor signal conditioning, low-speed data acquisition, and embedded control loops where deterministic timing and a mature toolchain (MPLAB, MPASM, C18) are valued. The 44-TQFP package provides ample I/O for moderate-complexity designs.
When designing with this part, note that OTP memory cannot be re-programmed in-circuit; for prototype iterations, choose a Flash-based sibling such as the PIC16F74 or PIC16F874 in the same package. The 'I' suffix denotes the industrial temperature grade (-40C to +85C), and 'LC' denotes the low-voltage CMOS process variant.
Alternatives de remplacement direct pour PIC16LC74A-04I/PT — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec PIC16LC74A-04I/PT (même facteur de forme et même empreinte) — différant par Package, Core Architecture, ADC, Timers, Serial Interfaces.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
PIC16F74-I/PT
✅ Remplacement direct✓ En stock
$5.55 / unité
Voir la fiche technique →PIC16LC74A-04I/PQ
✅ Remplacement direct✓ En stock
$5.1 / unité
Voir la fiche technique →PIC16LC74A-04/PT
✅ Remplacement direct✓ En stock
$3.75 / unité
Voir la fiche technique →PIC16F874-I/PT
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
PIC16F747-I/PT
✅ Remplacement direct✓ En stock
$4.4 / unité
Voir la fiche technique →PIC16F887-I/PT
✅ Remplacement direct✓ En stock
$1.66 / unité
Voir la fiche technique →PIC16LC74A-04I/PT Valeurs maximales et caractéristiques électriques
| Core Architecture | PIC 8-bit (PIC16C mid-range, 14-bit instruction) |
| Program Memory | 7 KB (4K x 14) OTP |
| Data RAM | 192 bytes |
| Fréquence d'horloge maximale | 4 MHz |
| I/O Pins | 33 |
| Boîtier | 44-pin TQFP (10x10 mm) |
| Type de montage | Surface Mount |
| Temperature Grade | Industrial (-40C to +85C) |
| A/D Converter | 8-bit integrated |
| Communication Peripherals | USART/SCI, SSP (SPI/I2C) |
| Timer Modules | Multiple 8/16-bit timers |
| Type de mémoire | OTP (One-Time Programmable) |
Configuration des broches de PIC16LC74A-04I/PT
| Broche 1 | OSC1/CLKI — Oscillator input / external clock |
| Broche 2 | OSC2/CLKO — Oscillator output |
| Broche 3 | MCLR/VPP — Reset input / programming voltage |
| Broche 4 | RA0/AN0 — Digital I/O / analog input 0 |
| Broche 5 | RA1/AN1 — Digital I/O / analog input 1 |
| Broche 6 | RA2/AN2 — Digital I/O / analog input 2 |
| Broche 7 | RA3/AN3/VREF — Digital I/O / analog input 3 / A/D reference |
| Broche 8 | RA4/T0CKI — Digital I/O / Timer0 clock |
| Broche 9 | RA5/AN4/SS — Digital I/O / analog input 4 / SPI slave select |
| Broche 10 | VSS — Ground |
| Broche 11 | VDD — Positive supply |
| Broche 12 | RB0/INT — Digital I/O / external interrupt |
| Broche 13 | RB1 — Digital I/O |
| Broche 14 | RB2 — Digital I/O |
| Broche 15 | RB3 — Digital I/O |
| Broche 16 | RB4 — Digital I/O |
| Broche 17 | RB5 — Digital I/O |
| Broche 18 | RB6/PGC — Digital I/O / ICSP clock |
| Broche 19 | RB7/PGD — Digital I/O / ICSP data |
| Broche 20 | VSS — Ground |
| Broche 21 | VDD — Positive supply |
| Broche 22 | RC0/T1OSO/T1CKI — Digital I/O / Timer1 oscillator output / clock |
| Broche 23 | RC1/T1OSI/CCP2 — Digital I/O / Timer1 oscillator input / CCP2 |
| Broche 24 | RC2/CCP1 — Digital I/O / CCP1 |
| Broche 25 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| Broche 26 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| Broche 27 | RC5/SDO — Digital I/O / SPI data out |
| Broche 28 | RC6/TX/CK — Digital I/O / USART TX / clock |
| Broche 29 | RC7/RX/DT — Digital I/O / USART RX / data |
| Broche 30 | VSS — Ground |
| Broche 31 | VDD — Positive supply |
| Broche 32 | RD0 — Digital I/O |
| Broche 33 | RD1 — Digital I/O |
| Broche 34 | RD2 — Digital I/O |
| Broche 35 | RD3 — Digital I/O |
| Broche 36 | RD4 — Digital I/O |
| Broche 37 | RD5 — Digital I/O |
| Broche 38 | RD6 — Digital I/O |
| Broche 39 | RD7 — Digital I/O |
| Broche 40 | VSS — Ground |
| Broche 41 | VDD — Positive supply |
| Broche 42 | RE0/RD/AN5 — Digital I/O / parallel port read / analog input 5 |
| Broche 43 | RE1/WR/AN6 — Digital I/O / parallel port write / analog input 6 |
| Broche 44 | RE2/CS/AN7 — Digital I/O / parallel port chip select / analog input 7 |
Applications typiques
PIC16LC74A-04I/PT convient pour 6 applications: Industrial Control Systems, Appliance Control Boards, Low-Speed Data Acquisition, Sensor Signal Conditioning and Interface, Automotive Subsystems (non-safety), Embedded Control Training and Prototyping.
Industrial Control Systems
The PIC16LC74A-04I/PT's 33 I/O pins and integrated peripherals make it well suited for industrial control panels driving relays, solenoid drivers, and discrete indicator LEDs. Its 4 MHz CPU clock executes instructions deterministically at 1 MIPS, sufficient for PID loops, sequencing logic, and sensor multiplexing in PLC-style designs. The industrial temperature grade (-40C to +85C) supports factory-floor environments with temperature swings.
Recommandé
Appliance Control Boards
The PIC16LC74A-04I/PT is commonly deployed in white-goods appliance controllers (washing machines, dishwashers, microwave ovens) where its 7 KB OTP memory holds locked firmware and the USART/SSP peripherals interface to display modules and sensor arrays. The wide operating voltage range and low current typical draw at CMOS clocks support energy-conscious appliances meeting Energy Star targets.
Recommandé
Low-Speed Data Acquisition
The PIC16LC74A-04I/PT's integrated 8-bit A/D converter with multiple input channels and USART/SCI peripheral makes it a cost-effective front end for low-speed data acquisition systems sampling temperature, pressure, or voltage at sub-kHz firmware-controlled intervals. 192 bytes of RAM buffers small sample windows before forwarding via serial, while the deterministic PIC core ensures fixed ADC acquisition timing.
Recommandé
Sensor Signal Conditioning and Interface
The PIC16LC74A-04I/PT's SSP (SPI/I2C) peripheral enables it to act as a sensor hub reading digital sensors and forwarding processed data to a host MCU. With 33 I/O ports, it can simultaneously scan multiple sensor channels and drive character LCDs or 7-segment displays. Its CMOS process ensures low current draw for battery-backed sensor interfaces in remote monitoring stations.
Recommandé
Automotive Subsystems (non-safety)
While not AEC-Q100 qualified, the PIC16LC74A-04I/PT is used in legacy automotive subsystems (interior lighting, mirror controllers, accessory timers) where its 44-TQFP industrial temperature grade and mature toolchain enable cost-sensitive designs. Designers transitioning to modern automotive should use AEC-Q100-qualified PIC16F or dsPIC equivalents from Microchip's automotive portfolio.
Recommandé
Embedded Control Training and Prototyping
The PIC16LC74A-04I/PT's mature MPLAB toolchain, MPASM assembler, and abundant third-party example code make it a popular choice for university courses and embedded systems training where students learn timer interrupts, A/D conversion, and serial communication. Its 44-TQFP package exposes enough I/O for breadboard-friendly breakout boards and peripheral experimentation.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour PIC16LC74A-04I/PT — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | PIC16F74-I/PT | PIC16LC74A-4I/PQ | PIC16LC74A-04/PT | PIC16F874-I/PT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-TQFP (10x10 mm) | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same die, MQFP body | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same |
| Program Memory | 7 KB OTP | 7 KB Flash | 7 KB OTP (same) | 7 KB OTP (same) | 7 KB Flash |
| Data RAM | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 368 bytes |
| Max Clock Frequency | 4 MHz | 20 MHz | 4 MHz | 4 MHz | 20 MHz |
| A/D Converter | 8-bit | 8-bit | 8-bit | 8-bit | 10-bit |
| I/O Pins | 33 | 33 | 33 | 33 | 33 |
| Temperature Grade | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Commercial (0C to +70C) | Industrial (-40C to +85C) |
| Memory Type | OTP (one-time) | Flash (reprogrammable) | OTP (one-time) | OTP (one-time) | Flash (reprogrammable) |
Principaux différenciateurs
- OTP memory for locked production firmware (vs PIC16F74-I/PT)
- Low-voltage CMOS 'LC' process (vs PIC16C74A-04I/PT)
- 44-TQFP package exposes 33 I/O pins with full peripheral set (vs PIC16F874-I/PT)
Notes de conception
OTP memory cannot be re-programmed in-circuit. A single bad write bricks the part. For development, use the Flash-based PIC16F74-I/PT in the same 44-TQFP package, then swap to PIC16LC74A-04I/PT only after firmware is fully validated and frozen. Always verify code in Flash hardware before ordering masked/OTP equivalents.
Place decoupling capacitors (100 nF ceramic + 10 uF bulk) as close as possible to each VDD/VSS pair (pins 11/10, 21/20, 31/30, 41/40). The PIC16LC74A-04I/PT has four VDD/VSS pairs; failing to decouple all four can inject digital switching noise into the A/D converter via shared internal power traces. A single 100 nF at pin 11 is not sufficient.
Keep the OSC1/OSC2 crystal traces short and surrounded by a ground guard ring to reduce EMI susceptibility. For 4 MHz operation, a parallel-resonant crystal with 22-33 pF load capacitors to ground is standard. Place the MCLR pull-up resistor (typically 10 kohm) close to pin 1 to ensure clean reset behavior during power-up.
The 44-TQFP (10x10 mm) package has 0.8 mm pitch and is surface-mount. Hand-soldering is difficult; plan for reflow or hot-air rework. Exposed pad variants are absent on this package, so no thermal pad landing is required - VDD/VSS pins provide thermal dissipation paths. Follow IPC-7351 land pattern recommendations for optimal yield.
The 'I' suffix denotes industrial temperature grade (-40C to +85C); the non-'I' PIC16LC74A-04/PT is commercial grade (0C to +70C). Substituting an 'I' part on a design intended for commercial environments is fine, but using the commercial part in an industrial design will fail temperature testing. Verify the exact suffix when ordering to avoid thermal-range surprises.
Informations de conformité
Compliance information not present in the verified web data; set to 'unknown' rather than guess. Per Microchip's general policy, parts in TQFP packages are typically lead-free but this specific part number's compliance status was not in the data; refer to manufacturer's product page or compliance certificate to confirm.