74AC175PC Equivalent & Substitute Parts

Part Overview

The 74AC175PC is a D-Type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 4 bits per element in a 16-DIP package. This component functions as a master reset flip-flop with complementary outputs and positive edge triggering. The product is currently obsolete, making equivalent substitute parts necessary for ongoing system maintenance, legacy design support, and component sourcing.

Substiute Parts

74AC175PC

onsemiIn Stock: 92774AC175PC Datasheet

Current PartRFQ

SN74ALS175N

Texas InstrumentsIn Stock: 2166SN74ALS175N Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74AC175PC is determined by the following critical parameters:

• Package Compatibility: Both main and substitute parts must use 16-DIP (0.300", 7.62mm) through-hole packaging to ensure direct PCB compatibility
• Functional Equivalence: D-Type flip-flop configuration with 1 element, 4 bits per element, complementary outputs, and positive edge triggering
• Electrical Interface: Pin-to-pin compatibility with matching input/output signal levels and timing characteristics
• Supply Voltage Range: Operating voltage must overlap with or encompass the original specification
• Temperature Range: Operating temperature must support the application environment

The SN74ALS175N from Texas Instruments meets these substitution criteria as a functionally equivalent D-Type flip-flop in the same 16-DIP package with compatible pin configuration and logic family characteristics.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS175N is an active product from Texas Instruments with ROHS3 compliance, providing long-term availability and regulatory alignment for new designs and legacy system support. The 74AC175PC, being obsolete, should be replaced with the SN74ALS175N for ongoing procurement.

Key considerations for selection:

• Product Availability: The SN74ALS175N is active with 2070 units in stock, ensuring reliable sourcing compared to the obsolete 74AC175PC
• Regulatory Compliance: The SN74ALS175N meets ROHS3 requirements, supporting modern supply chain and environmental standards
• Functional Compatibility: Both parts share identical D-Type flip-flop architecture, pin configuration, and logic family characteristics
• Performance Trade-offs: The SN74ALS175N operates at lower clock frequency (50 MHz vs. 244 MHz) and has longer propagation delay (17 ns vs. 9.5 ns), which may require verification in timing-critical applications
• Supply Voltage Range: The SN74ALS175N operates within 4.5V ~ 5.5V, a subset of the 74AC175PC range; applications using 2V ~ 4.5V supply voltages require alternative solutions

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS175N directly replace the 74AC175PC in existing designs?

A: Yes, for applications operating within the 4.5V ~ 5.5V supply range and 0°C ~ 70°C temperature range. Pin configuration and logic function are identical. Timing-critical applications must verify that the 17 ns propagation delay meets system requirements.

Q: What is the primary reason for substitution?

A: The 74AC175PC is obsolete. The SN74ALS175N provides equivalent functionality with active product status and modern compliance certifications.

Q: Are there package compatibility concerns?

A: No. Both parts use identical 16-DIP (0.300", 7.62mm) through-hole packaging, ensuring direct PCB compatibility without layout modifications.

Q: How do the electrical characteristics differ?

A: The SN74ALS175N has lower output current capability (400 µA / 8 mA vs. 24 mA / 24 mA), narrower supply voltage range (4.5V ~ 5.5V vs. 2V ~ 6V), and higher quiescent current (14 mA vs. 40 µA). Applications requiring high output drive or extended voltage range must evaluate these differences.

Q: What is the temperature operating range difference?

A: The 74AC175PC operates from -40°C ~ 85°C, while the SN74ALS175N operates from 0°C ~ 70°C. Applications requiring extended low-temperature operation below 0°C cannot use the SN74ALS175N as a direct substitute.

Q: Is the SN74ALS175N suitable for new designs?

A: Yes. The SN74ALS175N is an active product with ROHS3 compliance, making it the recommended choice for new designs requiring D-Type flip-flop functionality in 16-DIP packaging.