74VHC175M Equivalent & Substitute Parts

Part Overview

The 74VHC175M is a single-element D-type flip-flop with 4-bit configuration in a 16-SOIC surface mount package, manufactured by onsemi. This logic IC features complementary outputs, positive edge triggering, and master reset functionality. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support, maintenance, and production continuity. Substitute parts must maintain identical functional characteristics, electrical performance, and mechanical compatibility to ensure direct replacement capability.

Substiute Parts

74VHC175M

onsemiIn Stock: 945474VHC175M Datasheet

Current PartRFQ

74VHC175MX

Fairchild SemiconductorIn Stock: 388174VHC175MX Datasheet

DirectRFQ

SN74LV175AD

Texas InstrumentsIn Stock: 1097SN74LV175AD Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74VHC175M are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Mandatory Matching Parameters:

• Type: D-Type Flip Flop
• Number of Elements: 1
• Number of Bits per Element: 4
• Output Type: Complementary
• Trigger Type: Positive Edge
• Function: Master Reset
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount
• Operating Temperature Range: -40°C ~ 85°C

Allowable Parameter Variations: Substitute parts may exceed the main part specifications in the following parameters without compromising compatibility:

• Clock Frequency: May be higher than 115 MHz
• Max Propagation Delay: May be equal or lower (faster performance)
• Current - Output High, Low: May be higher than 8mA
• Current - Quiescent (Iq): May be higher than 4 µA
• Input Capacitance: May be lower than 4 pF
• Voltage - Supply Range: Must encompass or match 2V ~ 5.5V

Parameter Comparison

Engineering Selection Recommendations

74VHC175MX (Fairchild Semiconductor) is the primary direct substitute for the 74VHC175M. This part maintains identical electrical specifications and packaging, with active product status ensuring continued availability and supply chain support. The 74VHC175MX is suitable for direct replacement in all applications where the 74VHC175M was originally specified.

SN74LV175AD (Texas Instruments) is a compatible substitute with enhanced performance characteristics. The 74LV series variant operates within the same supply voltage range and temperature specifications. Performance improvements include higher clock frequency (165 MHz vs. 115 MHz), lower input capacitance (1.4 pF vs. 4 pF), and higher output current capability (12mA vs. 8mA). The SN74LV175AD carries Last Time Buy status, indicating limited future availability. This part is suitable for applications requiring improved performance margins, provided the design accommodates the higher quiescent current (20 µA vs. 4 µA). The SN74LV175AD is RoHS3 compliant, offering environmental compliance advantages.

Selection between 74VHC175MX and SN74LV175AD depends on supply chain requirements, compliance certifications, and performance headroom needs. The 74VHC175MX is recommended for standard replacement applications, while the SN74LV175AD is appropriate for designs benefiting from enhanced speed and lower input capacitance.

Frequently Asked Questions (FAQ)

Q: Can the 74VHC175MX directly replace the 74VHC175M without circuit modifications?

A: Yes. The 74VHC175MX maintains identical electrical and mechanical specifications, including supply voltage range (2V ~ 5.5V), propagation delay (9.3 ns @ 5V, 50pF), output current (8mA), and 16-SOIC package dimensions. Direct substitution is supported without design changes.

Q: What are the key differences between the 74VHC175M and SN74LV175AD?

A: Both parts share identical functional characteristics, package type, and operating temperature range. The SN74LV175AD offers higher clock frequency (165 MHz vs. 115 MHz), lower input capacitance (1.4 pF vs. 4 pF), and higher output current (12mA vs. 8mA). The SN74LV175AD has higher quiescent current (20 µA vs. 4 µA). These differences do not affect pin compatibility or basic functionality.

Q: Is the 16-SOIC package identical across all three parts?

A: Yes. All three parts use the 16-SOIC (0.154", 3.90mm Width) surface mount package with identical pinout and mechanical dimensions. PCB footprints and assembly processes are interchangeable.

Q: What is the significance of the product status differences?

A: The 74VHC175M is obsolete, making substitutes necessary for ongoing production. The 74VHC175MX (Active) offers the best long-term supply availability. The SN74LV175AD (Last Time Buy) has limited future availability and should be evaluated for long-term production planning.

Q: Are there compliance or certification differences between these parts?

A: The SN74LV175AD is RoHS3 compliant, providing environmental compliance certification. All three parts are REACH Unaffected and classified as EAR99 for export control purposes. Compliance requirements should be verified against specific application and regional standards.

Q: Can the SN74LV175AD be used in applications designed for the 74VHC175M?

A: Yes, with design verification. The SN74LV175AD is functionally compatible and pin-compatible. The higher quiescent current and output current specifications may affect power budget calculations. Applications with tight power consumption requirements should evaluate the impact of increased Iq (20 µA vs. 4 µA).