SN74HCS237DR Equivalent & Substitute Parts

Part Overview

The SN74HCS237DR is a high-speed CMOS logic decoder/demultiplexer manufactured by Texas Instruments. This 3-to-8 line decoder operates as a single independent circuit in a 16-SOIC surface mount package. The device is classified as Active product status and is ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Substitute parts are necessary when the primary part number experiences supply constraints, extended lead times, or when design requirements mandate automotive-grade qualification or alternative base product variants within the same functional family.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Logic
Type	Decoder/Demultiplexer
Circuit Configuration	1 x 3:8
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage Supply	2V ~ 6V (Single Supply)
Current - Output High, Low	7.8mA, 7.8mA
Operating Temperature	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the SN74HCS237DR is determined by strict equivalence across the following parameters:

Primary Substitution Criteria:

Decoder/Demultiplexer type with 1 x 3:8 circuit configuration
16-SOIC surface mount package (0.154", 3.90mm Width)
Voltage supply range: 2V ~ 6V (Single Supply)
Output current specifications: 7.8mA high and low
Operating temperature range: -40°C ~ 125°C
ROHS3 compliance and MSL 1 rating

Substitute Categories:

Standard Industrial Grade (Non-Automotive): SN74HCS137DR, SN74HCS138DR, SN74HCS238DR
- Identical electrical and mechanical specifications
- Active product status
- Differ only in base product number variant
Automotive Grade (AEC-Q100 Qualified): SN74HCS137QDRQ1, SN74HCS138QDRQ1, SN74HCS237QDRQ1, SN74HCS238QDRQ1
- All parameters identical to industrial grade
- Additional automotive qualification (AEC-Q100)
- Suitable for automotive applications requiring enhanced reliability

All substitute parts maintain identical electrical performance, thermal characteristics, and physical form factor compatibility.

Parameter Comparison

Part Number	Manufacturer	Type	Circuit	Package	Voltage Supply	Output Current (High/Low)	Operating Temp	Grade	Product Status
SN74HCS237DR	Texas Instruments	Decoder/Demultiplexer	1 x 3:8	16-SOIC	2V ~ 6V	7.8mA, 7.8mA	-40°C ~ 125°C	Industrial	Active
SN74HCS137DR	Texas Instruments	Decoder/Demultiplexer	1 x 3:8	16-SOIC	2V ~ 6V	7.8mA, 7.8mA	-40°C ~ 125°C	Industrial	Active
SN74HCS137QDRQ1	Texas Instruments	Decoder/Demultiplexer	1 x 3:8	16-SOIC	2V ~ 6V	7.8mA, 7.8mA	-40°C ~ 125°C	Automotive (AEC-Q100)	Active
SN74HCS138DR	Texas Instruments	Decoder/Demultiplexer	1 x 3:8	16-SOIC	2V ~ 6V	7.8mA, 7.8mA	-40°C ~ 125°C	Industrial	Active
SN74HCS138QDRQ1	Texas Instruments	Decoder/Demultiplexer	1 x 3:8	16-SOIC	2V ~ 6V	7.8mA, 7.8mA	-40°C ~ 125°C	Automotive (AEC-Q100)	Active
SN74HCS237QDRQ1	Texas Instruments	Decoder/Demultiplexer	1 x 3:8	16-SOIC	2V ~ 6V	7.8mA, 7.8mA	-40°C ~ 125°C	Automotive (AEC-Q100)	Active
SN74HCS238DR	Texas Instruments	Decoder/Demultiplexer	1 x 3:8	16-SOIC	2V ~ 6V	7.8mA, 7.8mA	-40°C ~ 125°C	Industrial	Active
SN74HCS238QDRQ1	Texas Instruments	Decoder/Demultiplexer	1 x 3:8	16-SOIC	2V ~ 6V	7.8mA, 7.8mA	-40°C ~ 125°C	Automotive (AEC-Q100)	Active

Engineering Selection Recommendations

For Industrial Applications: SN74HCS137DR, SN74HCS138DR, and SN74HCS238DR are direct functional equivalents to the SN74HCS237DR. All three maintain identical electrical specifications, thermal operating range, and physical packaging. Selection among these industrial-grade variants depends on design documentation requirements and supplier availability. All are Active status products with ROHS3 compliance.

For Automotive Applications: SN74HCS137QDRQ1, SN74HCS138QDRQ1, SN74HCS237QDRQ1, and SN74HCS238QDRQ1 are automotive-qualified alternatives with AEC-Q100 certification. These parts are suitable for designs requiring automotive-grade reliability and traceability. Electrical and mechanical specifications remain identical to industrial variants. Selection should align with automotive qualification requirements specified in design documentation.

Compliance Considerations: All substitute parts maintain ROHS3 compliance, MSL 1 rating, and Active product status. No compliance trade-offs exist between the main part and any substitute option.

Frequently Asked Questions (FAQ)

Q: Can SN74HCS137DR be used as a direct replacement for SN74HCS237DR?

A: Yes. Both parts are 3-to-8 line decoder/demultiplexers with identical electrical specifications (2V ~ 6V supply, 7.8mA output current), operating temperature range (-40°C ~ 125°C), and 16-SOIC package configuration. The base product number differs (74HCS137 vs. 74HCS237), but functional equivalence is complete.

Q: What is the difference between industrial and automotive-grade parts?

A: Automotive-grade parts (QDRQ1 suffix) carry AEC-Q100 qualification, indicating enhanced reliability testing and traceability for automotive applications. Electrical and mechanical specifications are identical to industrial-grade equivalents. Selection depends on application requirements and design documentation.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts use the 16-SOIC (0.154", 3.90mm Width) surface mount package. Physical form factor and PCB footprint compatibility is maintained across all options.

Q: Can automotive-grade parts be used in non-automotive applications?

A: Yes. Automotive-grade parts (AEC-Q100 qualified) meet or exceed industrial specifications and can be used in any application where the industrial equivalent is specified. No performance degradation occurs.

Q: What parameters determine substitution eligibility?

A: Substitution is based on circuit configuration (1 x 3:8 decoder/demultiplexer), package type (16-SOIC), voltage supply range (2V ~ 6V), output current (7.8mA), operating temperature (-40°C ~ 125°C), and compliance ratings (ROHS3, MSL 1). All listed substitutes meet these criteria.

Q: Are there any functional differences between SN74HCS237DR, SN74HCS137DR, SN74HCS138DR, and SN74HCS238DR?

A: No functional differences exist. All are 3-to-8 line decoder/demultiplexers with identical electrical performance and thermal characteristics. Differences are limited to base product number variants within the 74HCS series.

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