SN74HC393PWT Equivalent & Substitute Parts

Part Overview

The SN74HC393PWT is a binary counter IC manufactured by Texas Instruments, featuring two 4-bit counters with negative edge triggering in a 14-TSSOP surface mount package. This part is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing production and maintenance applications. The 74HC393 logic family provides reliable counting functionality across industrial and commercial temperature ranges with standard CMOS voltage supply compatibility.

Key Parameters

Parameter	Value
Logic Type	Binary Counter
Number of Elements	2
Number of Bits per Element	4
Direction	Up
Trigger Type	Negative Edge
Reset	Asynchronous
Voltage - Supply	2 V ~ 6 V
Package / Case	14-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SN74HC393PWT are qualified based on the following critical parameters that must remain constant:

Logic Type: Binary Counter
Number of Elements: 2
Number of Bits per Element: 4
Direction: Up
Trigger Type: Negative Edge
Reset: Asynchronous
Voltage - Supply: 2 V ~ 6 V
Package / Case: 14-TSSOP
Mounting Type: Surface Mount
Moisture Sensitivity Level: 1 (Unlimited)

All listed substitute parts maintain these core electrical and mechanical specifications, ensuring functional and physical compatibility with the original SN74HC393PWT design.

Parameter Comparison

Parameter	SN74HC393PWT (TI)	SN74HC393PWR (TI)	74HC393PW,118 (NXP)	MC74HC393ADTR2G (onsemi)
Manufacturer	Texas Instruments	Texas Instruments	NXP Semiconductors	onsemi
Logic Type	Binary Counter	Binary Counter	Binary Counter	Binary Counter
Number of Elements	2	2	2	2
Number of Bits per Element	4	4	4	4
Direction	Up	Up	Up	Up
Trigger Type	Negative Edge	Negative Edge	Negative Edge	Negative Edge
Reset	Asynchronous	Asynchronous	Asynchronous	Asynchronous
Voltage - Supply	2 V ~ 6 V	2 V ~ 6 V	2 V ~ 6 V	2 V ~ 6 V
Count Rate	36 MHz	36 MHz	107 MHz	50 MHz
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-55°C ~ 125°C
Package / Case	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Packaging Format	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Bulk	Tape & Reel (TR)
Product Status	Discontinued at DiGi Electronics	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

SN74HC393PWR (Texas Instruments) is the primary parametric equivalent, offering identical electrical specifications and operating temperature range to the original SN74HC393PWT. Both parts are manufactured by Texas Instruments with ROHS3 compliance. The SN74HC393PWR maintains active product status and is available in higher quantities, making it the preferred direct replacement for applications requiring continuity with the original design specifications.

74HC393PW,118 (NXP Semiconductors) provides extended operating temperature range (-40°C to 125°C) and higher count rate performance (107 MHz) compared to the original part. This substitute is suitable for applications requiring enhanced thermal performance or higher frequency operation within the same 14-TSSOP package footprint. Packaging is supplied in bulk format rather than tape and reel.

MC74HC393ADTR2G (onsemi) offers the widest operating temperature range (-55°C to 125°C) and moderate count rate (50 MHz). This part maintains ROHS3 compliance and is available in tape and reel packaging. The extended low-temperature specification makes this substitute appropriate for military or extreme environment applications.

All three substitute parts maintain identical core logic functionality, package dimensions, and voltage supply specifications, ensuring direct functional compatibility with the discontinued SN74HC393PWT in circuit designs.

Frequently Asked Questions (FAQ)

Q: Can SN74HC393PWR be used as a direct replacement for SN74HC393PWT?

A: Yes. Both parts are manufactured by Texas Instruments with identical electrical specifications, operating temperature range (-40°C to 85°C), and 14-TSSOP package dimensions. The primary difference is packaging format (Cut Tape & Digi-Reel® versus Tape & Reel), which does not affect circuit functionality.

Q: What are the key differences between the three substitute options?

A: The primary differences are manufacturer, count rate performance, operating temperature range, and packaging format. SN74HC393PWR matches the original specifications exactly. The NXP part offers higher count rate (107 MHz) and extended temperature range. The onsemi part provides the widest temperature range (-55°C to 125°C) for extreme environment applications.

Q: Are all substitute parts compatible with the original PCB layout?

A: Yes. All substitute parts use the identical 14-TSSOP package with 0.173" width and 4.40mm dimensions, ensuring pin-for-pin compatibility and identical PCB footprint requirements.

Q: Do all substitute parts meet RoHS compliance requirements?

A: SN74HC393PWR and MC74HC393ADTR2G are ROHS3 compliant. The NXP 74HC393PW,118 does not specify RoHS status in the provided data. Verify RoHS compliance requirements with your specific application standards before selection.

Q: Which substitute part should be selected for high-temperature applications?

A: MC74HC393ADTR2G supports the widest operating temperature range (-55°C to 125°C). For applications requiring only extended upper temperature limits, 74HC393PW,118 (-40°C to 125°C) is also suitable.

Q: Are there any differences in moisture sensitivity between the parts?

A: No. All parts, including the original SN74HC393PWT, have Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

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