SN74HC08D Equivalent & Substitute Parts

Part Overview

The SN74HC08D is a 4-channel AND gate logic integrated circuit manufactured by Texas Instruments, housed in a 14-SOIC surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives. The 74HC08 series provides standard AND gate logic functionality across the CMOS 74HC logic family, with multiple manufacturers offering compatible variants that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Logic Type	AND Gate
Number of Circuits	4
Number of Inputs	2
Voltage Supply Range	2V to 6V
Operating Temperature Range	-40°C to 85°C
Package Type	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Base Product Number	74HC08

Substitute Part Grouping Explanation

Substitution of the SN74HC08D is determined by strict adherence to the following criteria:

Primary Substitution Criteria:

Logic Type: AND Gate (4 channels, 2 inputs per channel)
Voltage Supply Range: 2V to 6V minimum
Package: 14-SOIC or 14-SO surface mount
Mounting Type: Surface mount
Base Product Number: 74HC08 series

Acceptable Variations:

Manufacturer: Multiple manufacturers produce 74HC08 variants
Packaging Format: Cut Tape (CT), Digi-Reel, Tube, or Tape & Reel (TR) formats are interchangeable for the same electrical part
Operating Temperature: Extended range (-55°C to 125°C) is acceptable as a superset of the original -40°C to 85°C range
Propagation Delay: Variations within the 74HC08 specification are acceptable (13ns to 20ns @ 6V, 50pF)
Quiescent Current: Variations within specification (1µA to 20µA) are acceptable
RoHS Compliance: ROHS3 compliant parts are preferred; non-compliant parts are listed but noted as obsolete

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Supply	Operating Temp	Package	Propagation Delay @ 6V, 50pF	Quiescent Current (Max)	RoHS Status
SN74HC08D	Texas Instruments	Discontinued	2V - 6V	-40°C to 85°C	14-SOIC	17ns	2µA	ROHS3
SN74HC08DR	Texas Instruments	Active	2V - 6V	-40°C to 85°C	14-SOIC	17ns	2µA	ROHS3
CD74HC08M96	Texas Instruments	Active	2V - 6V	-55°C to 125°C	14-SOIC	15ns	2µA	ROHS3
MC74HC08ADR2G	onsemi	Active	2V - 6V	-55°C to 125°C	14-SOIC	13ns	1µA	ROHS3
MC74HC08ADG	onsemi	Active	2V - 6V	-55°C to 125°C	14-SOIC	13ns	1µA	ROHS3
MM74HC08M	Fairchild Semiconductor	Active	2V - 6V	-40°C to 85°C	14-SOIC	20ns	2µA	Not specified
MM74HC08MX	Fairchild Semiconductor	Active	2V - 6V	-40°C to 85°C	14-SOIC	20ns	2µA	Not specified
74HC08D,653	Nexperia USA Inc.	Active	2V - 6V	-40°C to 125°C	14-SO	15ns	2µA	ROHS3
74HC08D-Q100,118	Nexperia USA Inc.	Active	2V - 6V	-40°C to 125°C	14-SO	15ns	2µA	ROHS3
74HC08S14-13	Diodes Incorporated	Active	2V - 6V	-40°C to 125°C	14-SO	15ns	20µA	ROHS3
CD74HC08M	Harris Corporation	Obsolete	2V - 6V	-55°C to 125°C	14-SOIC	15ns	2µA	Non-compliant

Engineering Selection Recommendations

Primary Recommendation: SN74HC08DR The SN74HC08DR from Texas Instruments is the direct active equivalent to the discontinued SN74HC08D. It maintains identical electrical specifications, operating temperature range, and ROHS3 compliance. This part is available in Cut Tape and Digi-Reel packaging formats with 10,100 units in stock.

Secondary Recommendations (Extended Temperature Range):

CD74HC08M96 (Texas Instruments): Offers extended operating temperature range (-55°C to 125°C) with improved propagation delay (15ns) and ROHS3 compliance. Suitable for applications requiring wider temperature operation.
MC74HC08ADR2G or MC74HC08ADG (onsemi): Provide extended temperature range with superior propagation delay (13ns) and lower quiescent current (1µA). ROHS3 compliant with high inventory availability.

Alternative Recommendations (Same Temperature Range):

74HC08D,653 or 74HC08D-Q100,118 (Nexperia USA Inc.): Active parts with ROHS3 compliance. The Q100 variant includes AEC-Q100 automotive qualification. Package designation is 14-SO (functionally equivalent to 14-SOIC).
MM74HC08M or MM74HC08MX (Fairchild Semiconductor): Active alternatives with matching temperature range. Propagation delay is 20ns, which remains within 74HC08 specification.

Not Recommended:

CD74HC08M (Harris Corporation): Listed as obsolete with non-compliant RoHS status. Avoid for new designs.
74HC08S14-13 (Diodes Incorporated): Quiescent current specification (20µA) exceeds typical 74HC08 performance, though remains within acceptable limits for non-critical applications.

Frequently Asked Questions (FAQ)

Q: Can I use SN74HC08DR as a direct replacement for SN74HC08D? A: Yes. The SN74HC08DR is the active equivalent from the same manufacturer with identical electrical specifications and operating temperature range. It is the recommended direct replacement.

Q: What is the difference between 14-SOIC and 14-SO packages? A: Both designations refer to 14-pin surface mount packages with 0.154" (3.90mm) width. The packages are mechanically and electrically compatible. SOIC and SO are equivalent designations used by different manufacturers.

Q: Can I substitute a part with extended temperature range (-55°C to 125°C) for the original (-40°C to 85°C)? A: Yes. Extended temperature range is a superset of the original specification and is acceptable for direct substitution. The part will operate correctly across the original temperature range and beyond.

Q: What is the significance of propagation delay variations (13ns to 20ns)? A: All listed substitutes meet the 74HC08 specification for propagation delay at 6V with 50pF load. Variations within this range do not affect functional compatibility. Parts with lower propagation delay (13ns to 15ns) offer improved performance.

Q: Are there packaging format differences between Cut Tape, Digi-Reel, Tube, and Tape & Reel? A: These designations describe the physical delivery format (reel type, tape configuration, or tube packaging) for the same electrical component. The actual IC is identical. Selection depends on assembly equipment compatibility and quantity requirements, not electrical performance.

Q: Why is CD74HC08M listed as obsolete? A: CD74HC08M is marked as obsolete by Harris Corporation and does not meet current RoHS3 compliance requirements. It should not be used in new designs.

Q: What does ROHS3 compliance mean? A: ROHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates the part meets European environmental standards for restricted substances. ROHS3 compliant parts are required for most commercial and industrial applications.

Q: Can I use onsemi MC74HC08ADR2G or MC74HC08ADG instead of the Texas Instruments original? A: Yes. Both onsemi parts are functionally equivalent with superior electrical performance (13ns propagation delay, 1µA quiescent current) and extended temperature range. They are ROHS3 compliant and suitable for direct substitution.

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