SN74HC175PWT Equivalent & Substitute Parts

Part Overview

The SN74HC175PWT is a D-type flip-flop logic integrated circuit manufactured by Texas Instruments, featuring 1 element with 4-bit configuration and complementary output type. This device operates as a master reset flip-flop with positive edge triggering, designed for digital logic applications requiring state storage and synchronization. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing production, maintenance, and new design implementations. Substitute parts maintain functional compatibility while offering improved availability and product status.

Key Parameters

Parameter	Value
Part Number	SN74HC175PWT
Manufacturer	Texas Instruments
Category	Logic
Type	D-Type Flip-Flop
Number of Elements	1
Number of Bits per Element	4
Output Type	Complementary
Clock Frequency	60 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
Current - Quiescent (Iq)	8 µA
Input Capacitance	3 pF
Operating Temperature Range	-40°C to 85°C
Package Type	16-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SN74HC175PWT are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Core Compatibility Criteria:

Identical base product number (74HC175 series)
Matching package type (16-TSSOP with 0.173", 4.40mm width)
Identical functional configuration (1 element, 4-bit D-type flip-flop, complementary output, positive edge trigger)
Matching supply voltage range (2V to 6V)
Equivalent output current specifications (5.2 mA high/low)
Surface mount mounting type

Allowable Parameter Variations:

Clock frequency may exceed 60 MHz specification
Propagation delay may be equal to or better than 26 ns
Quiescent current may be equal to or lower than 8 µA
Input capacitance may vary within manufacturer specifications
Operating temperature range may be extended beyond -40°C to 85°C
Packaging format (bulk, tape & reel) may differ
Product status may transition from obsolete to active

Parameter Comparison

Parameter	SN74HC175PWT (Main)	SN74HC175PWR	MM74HC175MTCX	74HC175PW,118	MC74HC175ADTR2G	NLV74HC175ADTR2G
Manufacturer	Texas Instruments	Texas Instruments	Fairchild Semiconductor	Nexperia USA Inc.	onsemi	onsemi
Product Status	Obsolete	Active	Active	Active	Active	Obsolete
Clock Frequency	60 MHz	60 MHz	70 MHz	89 MHz	35 MHz	35 MHz
Max Propagation Delay @ 6V, 50pF	26 ns	26 ns	26 ns	30 ns	22 ns	22 ns
Voltage Supply Range	2V to 6V	2V to 6V	2V to 6V	2V to 6V	2V to 6V	2V to 6V
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	5.2 mA / 5.2 mA
Current - Quiescent (Iq)	8 µA	8 µA	8 µA	8 µA	4 µA	4 µA
Input Capacitance	3 pF	3 pF	5 pF	4.6 pF	10 pF	10 pF
Operating Temperature Range	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 125°C	-55°C to 125°C	-55°C to 125°C
Package Type	16-TSSOP	16-TSSOP	16-TSSOP	16-TSSOP	16-TSSOP	16-TSSOP
Packaging Format	Tube	Tape & Reel (TR)	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	Not specified	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation: SN74HC175PWR

The SN74HC175PWR from Texas Instruments is the direct parametric equivalent, offering identical electrical specifications to the SN74HC175PWT while maintaining active product status. This part provides the most seamless transition for existing designs, with matching clock frequency (60 MHz), propagation delay (26 ns), and operating temperature range (-40°C to 85°C). Both parts carry ROHS3 compliance and MSL rating 1. The primary difference is packaging format (tape & reel versus tube), which accommodates high-volume production requirements.

Secondary Recommendation: 74HC175PW,118

The 74HC175PW,118 from Nexperia USA Inc. offers extended operating temperature range (-40°C to 125°C) and superior clock frequency performance (89 MHz), providing design margin for temperature-sensitive applications. Propagation delay is slightly higher at 30 ns, which remains within acceptable tolerance for most digital logic applications. This part maintains ROHS3 compliance and MSL rating 1.

Alternative Recommendation: MC74HC175ADTR2G

The MC74HC175ADTR2G from onsemi provides the fastest propagation delay (22 ns) and lowest quiescent current (4 µA), with extended operating temperature range (-55°C to 125°C). This part is suitable for applications requiring enhanced thermal performance or reduced power consumption. ROHS3 compliance and MSL rating 1 are maintained.

Avoid: NLV74HC175ADTR2G

While functionally compatible, the NLV74HC175ADTR2G carries obsolete product status, similar to the original SN74HC175PWT. This part should not be selected for new designs or long-term production planning.

Frequently Asked Questions (FAQ)

Q: Can I directly replace SN74HC175PWT with SN74HC175PWR in my existing design?

A: Yes. Both parts are electrically and mechanically identical, with matching specifications for clock frequency, propagation delay, supply voltage, output current, and operating temperature range. The only difference is packaging format (tube versus tape & reel). No circuit modifications are required.

Q: What is the difference between the various substitute parts?

A: All substitute parts maintain the core 74HC175 functional specification (1 element, 4-bit D-type flip-flop, complementary output, positive edge trigger) and 16-TSSOP package. Variations exist in clock frequency (35 MHz to 89 MHz), propagation delay (22 ns to 30 ns), quiescent current (4 µA to 8 µA), and operating temperature range (-40°C to 85°C, or -40°C to 125°C, or -55°C to 125°C). These variations allow selection based on specific application requirements.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed carry ROHS3 compliance certification, with the exception of MM74HC175MTCX, for which RoHS status is not specified in available documentation. For applications requiring mandatory RoHS compliance, select from SN74HC175PWR, 74HC175PW,118, MC74HC175ADTR2G, or NLV74HC175ADTR2G.

Q: What is the MSL (Moisture Sensitivity Level) rating, and why does it matter?

A: MSL rating 1 (Unlimited) indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. All substitute parts carry this rating, ensuring compatibility with standard manufacturing and storage practices.

Q: Can I use a substitute part with a higher clock frequency than the original specification?

A: Yes. Parts with clock frequencies exceeding 60 MHz (such as MM74HC175MTCX at 70 MHz or 74HC175PW,118 at 89 MHz) provide additional performance margin and are fully compatible. Higher clock frequency does not create compatibility issues in applications designed for the original 60 MHz specification.

Q: Which substitute part should I select for temperature-critical applications?

A: For applications requiring extended temperature range, select either 74HC175PW,118 (-40°C to 125°C) or MC74HC175ADTR2G (-55°C to 125°C). The MC74HC175ADTR2G offers the widest temperature range and lowest quiescent current, making it optimal for extreme thermal environments.

Q: What is the difference between tape & reel and bulk packaging?

A: Tape & reel packaging is standard for automated assembly lines and high-volume production, with components wound on continuous tape for pick-and-place equipment. Bulk packaging is used for manual assembly or lower-volume applications. Both formats contain identical components; packaging selection depends on manufacturing process requirements.

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