SN74AHCT08MPWREP Equivalent & Substitute Parts

Part Overview

The SN74AHCT08MPWREP is a 4-channel AND gate logic IC manufactured by Texas Instruments in 14-TSSOP surface mount packaging. This part operates across a 4.5V to 5.5V supply voltage range with a maximum propagation delay of 7.9ns at 5V with 50pF load. The device is classified as Last Time Buy, indicating production discontinuation. Equivalent and substitute parts are necessary to ensure design continuity and maintain supply chain reliability for applications requiring AND gate functionality with compatible electrical and mechanical specifications.

Key Parameters

Parameter	Value
Logic Type	AND Gate
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	4.5V ~ 5.5V
Current - Quiescent (Max)	2 µA
Current - Output High, Low	8mA, 8mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ 5V, 50pF	7.9ns
Operating Temperature	-55°C ~ 125°C
Package / Case	14-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SN74AHCT08MPWREP is determined by the following critical parameters:

Functional Equivalence: All substitute parts must be 4-channel AND gates with 2 inputs per channel, maintaining identical logic functionality.

Electrical Compatibility: Supply voltage range of 4.5V to 5.5V is mandatory. Output drive capability (8mA high and low) and input logic thresholds (0.8V low, 2V high) must be met or exceeded.

Timing Performance: Maximum propagation delay at 5V with 50pF load must not exceed 7.9ns to maintain system timing margins.

Package Compatibility: 14-TSSOP surface mount package with identical pinout is required for direct PCB replacement without layout modification.

Environmental Compliance: RoHS3 compliance and MSL 1 rating ensure regulatory and manufacturing process compatibility.

Substitute parts are grouped into two categories: direct pin-compatible replacements in 14-TSSOP packaging, and functionally equivalent alternatives in different packages (14-SOIC) requiring PCB layout adjustment.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Voltage - Supply	Current - Quiescent (Max)	Max Propagation Delay @ 5V, 50pF	Operating Temperature	Package / Case	Product Status	Inventory
SN74AHCT08MPWREP	Texas Instruments	74AHCT	4.5V ~ 5.5V	2 µA	7.9ns	-55°C ~ 125°C	14-TSSOP	Last Time Buy	826 Pcs
SN74LV4T08PWREP	Texas Instruments	74LV	1.6V ~ 5.5V	2 µA	13ns	-40°C ~ 125°C	14-TSSOP	Active	1006 Pcs
MC74VHCT08ADR2G	onsemi	74VHCT	4.5V ~ 5.5V	2 µA	7.9ns	-40°C ~ 125°C	14-SOIC	Active	9718 Pcs
MC74VHCT08ADTR2G	onsemi	74VHCT	4.5V ~ 5.5V	2 µA	7.9ns	-40°C ~ 125°C	14-TSSOP	Active	59810 Pcs
74AHCT08PW,118	Nexperia USA Inc.	74AHCT	4.5V ~ 5.5V	2 µA	7.9ns	-40°C ~ 125°C	14-TSSOP	Active	903 Pcs
74AHCT08PW-Q100J	Nexperia USA Inc.	74AHCT	4.5V ~ 5.5V	2 µA	7.9ns	-40°C ~ 125°C	14-TSSOP	Active	5339 Pcs
74AHCT08T14-13	Diodes Incorporated	74AHCT	4.5V ~ 5.5V	20 µA	10ns	-40°C ~ 125°C	14-TSSOP	Active	1958 Pcs
74VHCT08AMTCX	Fairchild Semiconductor	74VHCT	4.5V ~ 5.5V	2 µA	7.9ns	-40°C ~ 85°C	14-TSSOP	Active	23986 Pcs
74VHCT08PW,118	Nexperia USA Inc.	74VHCT	4.5V ~ 5.5V	2 µA	7.9ns	-40°C ~ 125°C	14-TSSOP	Active	20608 Pcs
74VHCT08PW-Q100J	Nexperia USA Inc.	74VHCT	4.5V ~ 5.5V	2 µA	7.9ns	-40°C ~ 125°C	14-TSSOP	Active	822 Pcs

Engineering Selection Recommendations

Primary Substitutes (14-TSSOP Package, Direct PCB Replacement):

MC74VHCT08ADTR2G (onsemi) and 74VHCT08PW,118 (Nexperia) are preferred substitutes. Both maintain identical electrical specifications (4.5V–5.5V supply, 7.9ns propagation delay, 2µA quiescent current) and 14-TSSOP packaging. These parts are in Active product status with high inventory availability (59,810 and 20,608 units respectively), ensuring long-term supply continuity.

74AHCT08PW,118 and 74AHCT08PW-Q100J (Nexperia) provide equivalent performance in the 74AHCT series. The -Q100J variant includes AEC-Q100 automotive qualification, suitable for automotive applications. Both maintain 7.9ns propagation delay and identical electrical parameters.

Secondary Substitutes (Electrical Equivalence with Considerations):

74AHCT08T14-13 (Diodes Incorporated) meets electrical requirements but exhibits higher quiescent current (20µA versus 2µA) and slightly longer propagation delay (10ns versus 7.9ns). This part is suitable for applications where power consumption and timing margins are less critical.

SN74LV4T08PWREP (Texas Instruments) operates across an extended supply voltage range (1.6V–5.5V) with Schmitt Trigger input characteristics. Propagation delay is 13ns at 5V, exceeding the original specification. This part is appropriate for low-voltage applications but requires timing verification.

Package Variant (Functional Equivalent):

MC74VHCT08ADR2G (onsemi) in 14-SOIC packaging provides identical electrical performance (7.9ns propagation delay, 4.5V–5.5V supply) but requires PCB layout modification due to different pin spacing (0.154" versus 0.173" width). This option is viable only when PCB redesign is acceptable.

Temperature Range Consideration:

74VHCT08AMTCX (Fairchild Semiconductor) operates to 85°C maximum, below the original -55°C to 125°C range. This part is restricted to applications with operating temperatures not exceeding 85°C.

Frequently Asked Questions (FAQ)

Q: Can MC74VHCT08ADR2G (14-SOIC) be used as a direct replacement for SN74AHCT08MPWREP (14-TSSOP)?

A: No. While electrically equivalent, the 14-SOIC package has different pin spacing (0.154" width versus 0.173" for 14-TSSOP). Direct PCB substitution is not possible without layout modification. The part is functionally suitable but requires board redesign.

Q: What is the difference between 74AHCT08PW,118 and 74AHCT08PW-Q100J?

A: Both are Nexperia 74AHCT08 parts in 14-TSSOP packaging with identical electrical specifications. The -Q100J variant includes AEC-Q100 automotive qualification and is intended for automotive applications. Electrical performance is equivalent.

Q: Is SN74LV4T08PWREP a suitable replacement?

A: SN74LV4T08PWREP is functionally compatible but with trade-offs. It operates across a wider supply range (1.6V–5.5V) and includes Schmitt Trigger inputs. However, propagation delay is 13ns versus 7.9ns for the original part. Use only if timing margins permit the additional delay.

Q: Why does 74AHCT08T14-13 have higher quiescent current?

A: 74AHCT08T14-13 (Diodes Incorporated) specifies 20µA maximum quiescent current compared to 2µA for other substitutes. This is a device-specific characteristic. Select this part only for applications where power consumption is not a constraint.

Q: Can 74VHCT08AMTCX be used in high-temperature applications?

A: No. 74VHCT08AMTCX operates to 85°C maximum, below the original part's 125°C upper limit. This part is restricted to applications with maximum operating temperatures of 85°C or lower.

Q: Are all substitute parts RoHS3 compliant?

A: Most substitutes are RoHS3 compliant. Verify compliance documentation for specific part numbers, particularly 74VHCT08AMTCX (Fairchild), where RoHS status was not specified in available data.

Q: What is the inventory status of recommended substitutes?

A: MC74VHCT08ADTR2G has the highest availability (59,810 units), followed by 74VHCT08PW,118 (20,608 units). Both are in Active product status, ensuring long-term supply. Original part SN74AHCT08MPWREP is Last Time Buy with 826 units remaining.

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