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PIC16LC74AT-04I/PQ Equivalent & Substitute Parts
Part Overview
The PIC16LC74AT-04I/PQ is an 8-bit microcontroller from Microchip Technology's PIC® 16C series, featuring 7KB OTP program memory, 192 bytes of RAM, and a 4MHz operating frequency. This device is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and component procurement.
The primary reason for identifying substitute parts is the obsolete status of the PIC16LC74AT-04I/PQ, which limits availability through standard distribution channels and may impact long-term supply chain reliability for production and maintenance applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Microchip Technology |
| Core Processor | PIC |
| Core Size | 8-Bit |
| Speed | 4MHz |
| Program Memory Size | 7KB (4K x 14) |
| Program Memory Type | OTP |
| RAM Size | 192 x 8 |
| Voltage Supply (Vcc/Vdd) | 2.5V ~ 6V |
| Number of I/O | 33 |
| Connectivity | I2C, SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Data Converters | A/D 5x8b |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount |
| Package / Case | 44-QFP |
| Supplier Device Package | 44-MQFP (10x10) |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) |
Substitute Part Grouping Explanation
Substitution of the PIC16LC74AT-04I/PQ is determined by strict equivalence across the following critical parameters:
- Core Architecture: PIC 8-bit processor
- Program Memory: 7KB OTP (4K x 14)
- RAM: 192 x 8 bytes
- Operating Frequency: 4MHz
- Supply Voltage Range: 2.5V ~ 6V
- I/O Count: 33 pins
- Connectivity Interfaces: I2C, SPI, UART/USART
- Peripheral Set: Brown-out Detect/Reset, POR, PWM, WDT
- Data Conversion: A/D 5x8b
- Package: 44-QFP (44-MQFP 10x10)
- Temperature Range: -40°C ~ 85°C
- Compliance: ROHS3, REACH Unaffected
The PIC16LC74A-04I/PQ meets all these criteria and is identified as a direct substitute.
Parameter Comparison
| Parameter | PIC16LC74AT-04I/PQ | PIC16LC74A-04I/PQ |
|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology |
| Series | PIC® 16C | PIC® 16C |
| Core Processor | PIC | PIC |
| Core Size | 8-Bit | 8-Bit |
| Speed | 4MHz | 4MHz |
| Program Memory Size | 7KB (4K x 14) | 7KB (4K x 14) |
| Program Memory Type | OTP | OTP |
| RAM Size | 192 x 8 | 192 x 8 |
| Voltage Supply (Vcc/Vdd) | 2.5V ~ 6V | 2.5V ~ 6V |
| Number of I/O | 33 | 33 |
| Connectivity | I2C, SPI, UART/USART | I2C, SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT | Brown-out Detect/Reset, POR, PWM, WDT |
| Data Converters | A/D 5x8b | A/D 5x8b |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 44-QFP | 44-QFP |
| Supplier Device Package | 44-MQFP (10x10) | 44-MQFP (10x10) |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) | 3 (168 Hours) |
| REACH Status | REACH Unaffected | REACH Unaffected |
| Product Status | Obsolete | Active |
Engineering Selection Recommendations
The PIC16LC74A-04I/PQ is the direct substitute for the PIC16LC74AT-04I/PQ. Both devices are electrically and mechanically identical across all specified parameters. The primary distinction is product status: the original part is obsolete while the substitute is active.
Selection of the PIC16LC74A-04I/PQ is supported by:
- Full electrical equivalence across all functional parameters
- Identical package and pinout (44-QFP)
- Matching compliance certifications (ROHS3, REACH Unaffected)
- Active product status ensuring ongoing availability
- Higher inventory availability (2220 units versus 957 units)
Frequently Asked Questions (FAQ)
Q: Are the PIC16LC74AT-04I/PQ and PIC16LC74A-04I/PQ pin-compatible?
A: Yes. Both devices use the 44-QFP (44-MQFP 10x10) package with identical pinout and I/O configuration (33 I/O pins).
Q: Can the PIC16LC74A-04I/PQ be used as a direct replacement without circuit modifications?
A: Yes. The substitute part is electrically equivalent across all specified parameters including voltage supply range (2.5V ~ 6V), operating frequency (4MHz), memory configuration, and peripheral set.
Q: What is the difference between the two part numbers?
A: The primary difference is product status. The PIC16LC74AT-04I/PQ is obsolete, while the PIC16LC74A-04I/PQ is active. The packaging differs slightly (unspecified versus Tray), but electrical and functional specifications are identical.
Q: Are there compliance or certification differences?
A: No. Both parts maintain ROHS3 compliance and REACH Unaffected status with identical Moisture Sensitivity Level (MSL 3, 168 Hours).
Q: What is the inventory situation for each part?
A: The PIC16LC74AT-04I/PQ has 957 units in stock. The PIC16LC74A-04I/PQ has 2220 units in stock, providing greater availability for procurement.
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