SN74AHCT1G02DBVT Equivalent & Substitute Parts

Part Overview

The SN74AHCT1G02DBVT is a single-channel NOR gate logic IC manufactured by Texas Instruments in SOT-23-5 surface mount packaging. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device operates within a 4.5V to 5.5V supply voltage range and is ROHS3 compliant with unlimited moisture sensitivity rating.

Key Parameters

Parameter	Value
Logic Type	NOR Gate
Number of Circuits	1
Number of Inputs	2
Voltage - Supply	4.5V ~ 5.5V
Current - Quiescent (Max)	1 µA
Current - Output High, Low	8mA, 8mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ V, Max CL	7.5ns @ 5V, 50pF
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	SC-74A, SOT-753
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN74AHCT1G02DBVT is determined by the following criteria:

Parametric Equivalence Requirements:

Logic type: NOR Gate with 1 channel and 2 inputs
Supply voltage range: 4.5V ~ 5.5V
Quiescent current: 1 µA maximum
Output current capability: 8mA high and low
Input logic levels: 0.8V low, 2V high
Propagation delay: 7.5ns @ 5V, 50pF
Operating temperature range: Minimum -40°C, maximum 85°C or higher
Surface mount packaging with compatible pinout

Substitution Categories:

Parametric equivalents maintain identical electrical specifications and are direct pin-compatible replacements. Direct manufacturer alternatives meet all electrical parameters but may differ in packaging format or manufacturer. Upgrade options provide enhanced specifications such as extended temperature range or automotive qualification. Manufacturer-recommended parts are qualified alternatives with active product status.

Parameter Comparison

Part Number	Manufacturer	Series	Package	Supply Voltage	Quiescent Current	Output Current	Propagation Delay	Temp Range	Status
SN74AHCT1G02DBVT	Texas Instruments	74AHCT	SOT-23-5	4.5V ~ 5.5V	1 µA	8mA, 8mA	7.5ns @ 5V, 50pF	-40°C ~ 85°C	Discontinued
SN74AHCT1G02DBVR	Texas Instruments	74AHCT	SOT-23-5	4.5V ~ 5.5V	1 µA	8mA, 8mA	7.5ns @ 5V, 50pF	-40°C ~ 85°C	Active
74AHCT1G02W5-7	Diodes Incorporated	74AHCT	SOT-25	4.5V ~ 5.5V	1 µA	8mA, 8mA	7.5ns @ 5V, 50pF	-40°C ~ 125°C	Active
MC74VHC1G02DTT1G	onsemi	74VHC	5-TSOP	2V ~ 5.5V	1 µA	8mA, 8mA	7.5ns @ 5V, 50pF	-55°C ~ 125°C	Obsolete
74AHCT1G02GV,125	NXP Semiconductors	74AHCT	Bulk	Not specified	Not specified	Not specified	Not specified	Not specified	Active
74AHCT1G02GV-Q100H	Nexperia USA Inc.	74AHCT	SC-74A	4.5V ~ 5.5V	1 µA	8mA, 8mA	7.5ns @ 5V, 50pF	-40°C ~ 125°C	Active
74AHCT1G02GW,125	Nexperia USA Inc.	74AHCT	5-TSSOP	4.5V ~ 5.5V	1 µA	8mA, 8mA	7.5ns @ 5V, 50pF	-40°C ~ 125°C	Active
74HCT1G02GV,125	Nexperia USA Inc.	74HCT	SC-74A	4.5V ~ 5.5V	20 µA	2mA, 2mA	11ns @ 4.5V, 50pF	-40°C ~ 125°C	Active
NC7ST02M5X	Fairchild Semiconductor	7ST	SOT-23-5	4.5V ~ 5.5V	1 µA	2mA, 2mA	26ns @ 5.5V, 50pF	-40°C ~ 85°C	Active
NC7ST02P5X	Fairchild Semiconductor	7ST	SC-70-5	4.5V ~ 5.5V	1 µA	2mA, 2mA	26ns @ 5.5V, 50pF	-40°C ~ 85°C	Active

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalent): SN74AHCT1G02DBVR from Texas Instruments is the primary parametric equivalent with identical electrical specifications and active product status. This part maintains the same SOT-23-5 package and all critical performance parameters.

Active Alternatives with Extended Temperature Range: 74AHCT1G02GV-Q100H (Nexperia USA Inc.) and 74AHCT1G02GW,125 (Nexperia USA Inc.) provide extended operating temperature to 125°C while maintaining all electrical specifications. The GV-Q100H variant includes automotive qualification (AEC-Q100) and is suitable for automotive applications. The GW,125 variant uses 5-TSSOP packaging.

Alternative Packaging Options: 74AHCT1G02W5-7 from Diodes Incorporated offers SOT-25 packaging with extended temperature range to 125°C and active product status. NC7ST02M5X from Fairchild Semiconductor provides SOT-23-5 packaging but with reduced output current (2mA) and slower propagation delay (26ns).

Avoid: MC74VHC1G02DTT1G (onsemi) has obsolete product status. 74HCT1G02GV,125 (Nexperia USA Inc.) has significantly higher quiescent current (20 µA) and reduced output current (2mA), making it unsuitable for applications requiring the original specifications.

Frequently Asked Questions (FAQ)

Q: Can SN74AHCT1G02DBVR directly replace SN74AHCT1G02DBVT? A: Yes. SN74AHCT1G02DBVR is a parametric equivalent with identical electrical specifications, same SOT-23-5 package, and active product status from Texas Instruments.

Q: What is the difference between 74AHCT and 74HCT series? A: The 74AHCT series has lower quiescent current (1 µA) and higher output current (8mA) compared to 74HCT series (20 µA quiescent, 2mA output). These are not interchangeable in current-sensitive applications.

Q: Can I use NC7ST02M5X as a substitute? A: NC7ST02M5X maintains the same SOT-23-5 package and supply voltage range but has reduced output current (2mA versus 8mA) and slower propagation delay (26ns versus 7.5ns). Use only if your application tolerates these reduced specifications.

Q: What is the advantage of 74AHCT1G02GV-Q100H? A: This part extends the operating temperature range to 125°C and includes automotive qualification (AEC-Q100 grade), making it suitable for automotive and extended-temperature applications while maintaining all electrical specifications.

Q: Are there packaging alternatives available? A: Yes. 74AHCT1G02GW,125 uses 5-TSSOP packaging, 74AHCT1G02W5-7 uses SOT-25 packaging, and NC7ST02P5X uses SC-70-5 packaging. All maintain compatible electrical specifications with the original part.

Q: Why is MC74VHC1G02DTT1G listed as obsolete? A: MC74VHC1G02DTT1G has obsolete product status and should not be selected for new designs. Use active alternatives such as SN74AHCT1G02DBVR or 74AHCT1G02GV-Q100H instead.

Q: What does ROHS3 compliance mean? A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials in electronic products.

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