74AC08MTC AND Gate IC Equivalent & Substitute Parts

Part Overview

The 74AC08MTC is a 4-channel 2-input AND gate logic IC manufactured by onsemi in 14-TSSOP surface mount packaging. This part is currently obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The 74AC08 series represents a standard logic gate function across multiple manufacturers, with several active alternatives available 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 ~ 6V
Current Output High/Low	24mA / 24mA
Max Propagation Delay	7.5ns @ 5V, 50pF
Operating Temperature	-40°C ~ 85°C
Package Type	14-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the 74AC08MTC is determined by the following critical parameters:

Logic Function: All substitutes must implement 4-channel 2-input AND gate logic
Electrical Specifications: Supply voltage range (2V ~ 6V), output current (24mA), and propagation delay (7.5ns @ 5V, 50pF) must be maintained
Package Compatibility: Primary substitutes use 14-TSSOP packaging; alternative package options (14-SSOP) are listed as similar but require PCB layout verification
Mounting Type: Surface mount requirement is consistent across all substitutes
Compliance: RoHS3 compliance and MSL Level 1 are maintained across all alternatives

Substitute parts are categorized as follows:

Direct Manufacturer Substitutes: MC74AC08DTR2G (onsemi, Tape & Reel packaging)
Direct Equivalent Substitutes: SN74AC08PWR (Texas Instruments, Tape & Reel packaging)
Upgrade Substitutes: SN74AC08QPWRG4Q1, SN74AC08QPWRQ1 (Texas Instruments, automotive-grade with extended temperature range -40°C ~ 125°C and AEC-Q100 qualification)
Similar Package Substitute: SN74AC08DBR (Texas Instruments, 14-SSOP package variant)
Parametric Equivalent: SN74AC08PW (Texas Instruments, Tube packaging, discontinued at DiGi Electronics)

Parameter Comparison

Part Number	Manufacturer	Status	Package	Packaging Type	Quiescent Current (Max)	Operating Temp	Grade	Inventory
74AC08MTC	onsemi	Obsolete	14-TSSOP	Tube	2 µA	-40°C ~ 85°C	Standard	1510 Pcs
MC74AC08DTR2G	onsemi	Active	14-TSSOP	Tape & Reel	4 µA	-40°C ~ 85°C	Standard	2469 Pcs
SN74AC08PWR	Texas Instruments	Active	14-TSSOP	Tape & Reel	2 µA	-40°C ~ 85°C	Standard	81645 Pcs
SN74AC08QPWRG4Q1	Texas Instruments	Active	14-TSSOP	Tape & Reel	2 µA	-40°C ~ 125°C	Automotive (AEC-Q100)	2658 Pcs
SN74AC08QPWRQ1	Texas Instruments	Active	14-TSSOP	Cut Tape & Digi-Reel	2 µA	-40°C ~ 125°C	Automotive (AEC-Q100)	2584 Pcs
SN74AC08DBR	Texas Instruments	Active	14-SSOP	Cut Tape & Digi-Reel	2 µA	-40°C ~ 85°C	Standard	1900 Pcs
SN74AC08PW	Texas Instruments	Discontinued (DiGi Electronics)	14-TSSOP	Tube	2 µA	-40°C ~ 85°C	Standard	1143 Pcs

Engineering Selection Recommendations

For Direct Replacement (Pin-Compatible, Same Package)

SN74AC08PWR is the primary recommended substitute. It is manufactured by Texas Instruments, maintains identical electrical specifications to the 74AC08MTC, uses the same 14-TSSOP package, and has the highest inventory availability (81,645 pcs). Product status is active with no discontinuation risk.

MC74AC08DTR2G is an alternative from onsemi with active status. The quiescent current specification is 4 µA (versus 2 µA for the original), which may be relevant in low-power applications but does not affect functional compatibility.

For Automotive and Extended Temperature Applications

SN74AC08QPWRG4Q1 and SN74AC08QPWRQ1 are automotive-grade alternatives with AEC-Q100 qualification and extended operating temperature range (-40°C ~ 125°C). These are suitable for applications requiring automotive compliance or operation in elevated temperature environments. Both are active products with good inventory levels.

For Alternative Packaging

SN74AC08DBR uses 14-SSOP packaging instead of 14-TSSOP. While electrically equivalent, the package footprint differs (0.209" versus 0.173" width). PCB layout and land pattern verification is required before substitution.

For Tube Packaging

SN74AC08PW maintains tube packaging identical to the original 74AC08MTC but is discontinued at DiGi Electronics. Inventory is limited (1,143 pcs). This option is suitable only if tube packaging is a specific requirement and existing stock is available.

Frequently Asked Questions (FAQ)

Q: Can I use SN74AC08PWR as a direct replacement for 74AC08MTC?

A: Yes. SN74AC08PWR is electrically and mechanically compatible. Both use 14-TSSOP packaging, maintain identical electrical specifications (2V ~ 6V supply, 24mA output current, 7.5ns propagation delay), and operate across -40°C ~ 85°C. The primary difference is packaging format (Tape & Reel versus Tube), which does not affect circuit performance.

Q: What is the difference between the standard-grade and automotive-grade substitutes?

A: Automotive-grade parts (SN74AC08QPWRG4Q1, SN74AC08QPWRQ1) carry AEC-Q100 qualification and support extended operating temperature to 125°C. Standard-grade parts operate to 85°C. Automotive-grade parts are required for applications in automotive systems or environments with elevated temperature specifications. Both grades are electrically equivalent within their respective temperature ranges.

Q: Why does MC74AC08DTR2G show 4 µA quiescent current instead of 2 µA?

A: MC74AC08DTR2G has a higher maximum quiescent current specification (4 µA) compared to the original 74AC08MTC (2 µA). This represents a worst-case specification difference and does not affect functional compatibility. For applications with strict power consumption requirements, SN74AC08PWR or automotive-grade alternatives with 2 µA specification are preferred.

Q: Can I substitute 14-SSOP package (SN74AC08DBR) for 14-TSSOP?

A: SN74AC08DBR is electrically equivalent but uses different packaging (14-SSOP, 0.209" width versus 14-TSSOP, 0.173" width). The pin count and function are identical, but the physical footprint differs. PCB land pattern and layout must be verified for compatibility before substitution.

Q: Is the 74AC08MTC still available?

A: The 74AC08MTC is obsolete. Current inventory is limited (1,510 pcs). For new designs and ongoing production, active substitutes such as SN74AC08PWR or MC74AC08DTR2G are recommended.

Q: What packaging options are available for the 74AC08 logic gate?

A: The 74AC08 is available in multiple packaging formats: 14-TSSOP (primary, 0.173" width), 14-SSOP (alternative, 0.209" width), and Tube or Tape & Reel configurations. Selection depends on assembly requirements and PCB design constraints.

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