MM74HC175SJ Equivalent & Substitute Parts

Part Overview

The MM74HC175SJ is a D-type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 4-bit configuration and complementary output type. This component operates as a master reset flip-flop in the 74HC logic series and is housed in a 16-SOIC package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	MM74HC175SJ
Manufacturer	onsemi
Base Product Number	74HC175
Function	Master Reset
Type	D-Type Flip-Flop
Number of Elements	1
Number of Bits per Element	4
Output Type	Complementary
Clock Frequency	70 MHz
Max Propagation Delay @ 6V, 50pF	26 ns
Trigger Type	Positive Edge
Voltage Supply Range	2V to 6V
Current Output High/Low	5.2 mA / 5.2 mA
Quiescent Current (Iq)	8 µA
Input Capacitance	5 pF
Operating Temperature Range	-40°C to 85°C
Package / Case	16-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MM74HC175SJ is determined by the following critical parameters:

Functional Equivalence: All substitute parts must maintain the same base product number (74HC175 or 74LV175 series), D-type flip-flop configuration with 1 element, 4-bit structure, complementary output type, master reset function, and positive edge trigger type.

Electrical Compatibility: Substitute parts must operate within the voltage supply range of 2V to 6V (or a subset thereof), maintain compatible propagation delay characteristics at specified load conditions, and provide equivalent output current drive capabilities (5.2 mA minimum).

Package Compatibility: Physical package must be 16-SOIC form factor. Variations in package body width (0.154" or 0.209") are acceptable as both are standard 16-SOIC variants and compatible with the same PCB footprint.

Operating Temperature: Substitute parts must support the minimum operating temperature range of -40°C to 85°C. Extended temperature ranges are acceptable.

Product Status Consideration: Active or recently discontinued parts are preferred over obsolete parts for long-term availability and supply chain stability.

Parameter Comparison

Parameter	MM74HC175SJ (Main)	SN74HC175NSR	74HC175D,653	CD74HC175M96	SN74HC175DR	SN74LV175ANSR
Manufacturer	onsemi	Texas Instruments	Nexperia USA Inc.	Texas Instruments	Texas Instruments	Texas Instruments
Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type
Number of Elements	1	1	1	1	1	1
Number of Bits per Element	4	4	4	4	4	4
Output Type	Complementary	Complementary	Complementary	Complementary	Complementary	Complementary
Clock Frequency	70 MHz	60 MHz	89 MHz	35 MHz	60 MHz	165 MHz
Max Propagation Delay @ 6V, 50pF	26 ns	26 ns	30 ns	30 ns	26 ns	9.3 ns @ 5V
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Voltage Supply Range	2V to 6V	2V to 6V	2V to 6V	2V to 6V	2V to 6V	2V to 5.5V
Current Output High/Low	5.2 mA / 5.2 mA	5.2 mA / 5.2 mA	5.2 mA / 5.2 mA	5.2 mA / 5.2 mA	5.2 mA / 5.2 mA	12 mA / 12 mA
Quiescent Current (Iq)	8 µA	8 µA	8 µA	8 µA	8 µA	20 µA
Input Capacitance	5 pF	3 pF	4.6 pF	10 pF	3 pF	1.4 pF
Operating Temperature Range	-40°C to 85°C	-40°C to 85°C	-40°C to 125°C	-55°C to 125°C	-40°C to 85°C	-40°C to 85°C
Package / Case	16-SOIC (0.209", 5.30mm)	16-SOIC (0.209", 5.30mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.209", 5.30mm)
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	REACH Unaffected	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

SN74HC175NSR and SN74HC175DR from Texas Instruments are direct functional equivalents with identical propagation delay (26 ns @ 6V, 50pF), matching output current specifications, and equivalent operating temperature range. Both maintain the 16-SOIC package form factor and are currently active products with ROHS3 compliance. SN74HC175NSR is supplied in Tape & Reel packaging, while SN74HC175DR is available in Cut Tape & Digi-Reel format.

Secondary Substitutes (Acceptable with Design Verification):

74HC175D,653 from Nexperia USA Inc. provides functional equivalence with extended operating temperature range (-40°C to 125°C) and higher clock frequency (89 MHz). Propagation delay is slightly increased to 30 ns. This part is active and ROHS3 compliant but uses the narrower 16-SOIC package variant (0.154", 3.90mm width).

CD74HC175M96 from Texas Instruments offers extended temperature range (-55°C to 125°C) and ROHS3 compliance. Clock frequency is reduced to 35 MHz with 30 ns propagation delay. This part is suitable for applications requiring broader temperature operation but with lower frequency requirements.

Alternative Series Consideration:

SN74LV175ANSR from Texas Instruments represents a different logic family (74LV series) with superior performance characteristics: 165 MHz clock frequency, 9.3 ns propagation delay, and higher output current (12 mA). However, the supply voltage range is restricted to 2V to 5.5V (incompatible with 6V operation). This substitute is appropriate only for designs operating at 5.5V or below.

Compliance and Availability:

All recommended active substitutes carry ROHS3 compliance and REACH Unaffected status, meeting modern regulatory requirements. Texas Instruments parts demonstrate superior long-term availability and supply chain stability compared to the obsolete onsemi original.

Frequently Asked Questions (FAQ)

Q: Can SN74HC175NSR directly replace MM74HC175SJ without PCB modification?

A: Yes. Both parts use the 16-SOIC package form factor with identical pin configuration and electrical specifications. The packaging difference (Tape & Reel vs. original packaging) does not affect circuit operation. No PCB layout changes are required.

Q: What is the difference between the 0.209" and 0.154" package width variants?

A: Both are standard 16-SOIC packages with identical pin pitch (1.27 mm) and footprint compatibility. The width difference reflects manufacturing variations between suppliers. PCB footprints designed for either variant will accommodate both without modification.

Q: Is 74HC175D,653 suitable for applications requiring 6V operation?

A: Yes. The 74HC175D,653 operates across the 2V to 6V supply range, matching the original MM74HC175SJ specification. The extended temperature range (-40°C to 125°C) provides additional margin for harsh environments.

Q: Why does SN74LV175ANSR have different electrical characteristics?

A: The SN74LV175ANSR belongs to the 74LV logic family, which uses lower voltage thresholds and different internal architecture. While functionally equivalent as a D-type flip-flop, it operates at reduced supply voltage (2V to 5.5V maximum) and exhibits superior speed performance. Use this part only in designs where 5.5V maximum supply voltage is acceptable.

Q: What is the impact of different propagation delays on circuit design?

A: Propagation delay determines the maximum frequency at which the flip-flop can reliably capture and transfer data. The MM74HC175SJ specifies 26 ns maximum delay. Substitutes with equal or lower delay (SN74HC175NSR, SN74HC175DR at 26 ns) are direct replacements. Parts with 30 ns delay (74HC175D,653, CD74HC175M96) are acceptable for applications operating below the frequency limit determined by the longer delay. The SN74LV175ANSR with 9.3 ns delay provides additional frequency margin.

Q: Are there packaging considerations for automated assembly?

A: SN74HC175NSR is supplied in Tape & Reel format, optimized for pick-and-place assembly. SN74HC175DR is available in Cut Tape & Digi-Reel format. CD74HC175M96 is supplied in Tape & Reel. Verify packaging format compatibility with your assembly process before procurement.

Q: What compliance certifications should I verify for new designs?

A: All recommended active substitutes carry ROHS3 compliance and REACH Unaffected status. Verify ECCN classification (all listed parts are EAR99) and HTSUS code (8542.39.0001) for export and tariff purposes if applicable to your supply chain.

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