74AC32SJX OR Gate IC Equivalent & Substitute Parts

Part Overview

The 74AC32SJX is a 4-channel 2-input OR gate logic IC manufactured by onsemi in 14-SOP packaging. This part is currently obsolete, making equivalent and substitute parts necessary for ongoing production, maintenance, and new designs. The 74AC32 series maintains consistent functional specifications across multiple manufacturers and package variants, enabling direct substitution based on electrical parameters and physical compatibility requirements.

Key Parameters

Parameter	Specification
Logic Type	OR Gate
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	2V ~ 6V
Current - Quiescent (Max)	2 µA
Current - Output High, Low	24mA, 24mA
Input Logic Level - Low	0.9V ~ 1.65V
Input Logic Level - High	2.1V ~ 3.85V
Max Propagation Delay @ 5V, 50pF	7.5ns
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Base Product Number	74AC32

Substitute Part Grouping Explanation

Substitution of the 74AC32SJX is determined by the following criteria:

Electrical Compatibility: All substitute parts must maintain the same logic function (4-channel 2-input OR gate), supply voltage range (2V ~ 6V minimum), quiescent current (2 µA maximum), output current capability (24mA minimum), and propagation delay specifications (7.5ns maximum at 5V, 50pF load).

Mechanical Compatibility: Package type determines physical fit on printed circuit boards. The 74AC32SJX uses 14-SOP packaging. Substitutes with different package types (14-TSSOP, 14-SOIC, 14-SO) require PCB layout modifications but maintain identical pin configurations and electrical function.

Product Status: Active parts are preferred for new designs and long-term availability. Discontinued or obsolete parts may have limited inventory.

Compliance: RoHS3 compliance and REACH unaffected status are standard across active substitute parts.

Parameter Comparison

Part Number	Manufacturer	Package Type	Product Status	Voltage Supply	Quiescent Current (Max)	Propagation Delay @ 5V	Operating Temp	RoHS Status
74AC32SJX	onsemi	14-SOP	Obsolete	2V ~ 6V	2 µA	7.5ns	-40°C ~ 85°C	Not specified
74AC32MTCX	onsemi	14-TSSOP	Active	2V ~ 6V	2 µA	7.5ns	-40°C ~ 85°C	ROHS3 Compliant
74AC32SCX	onsemi	14-SOIC	Active	2V ~ 6V	2 µA	7.5ns	-40°C ~ 85°C	ROHS3 Compliant
CD74AC32M96	Texas Instruments	14-SOIC	Active	1.5V ~ 5.5V	4 µA	9.5ns	-55°C ~ 125°C	ROHS3 Compliant
SN74AC32D	Texas Instruments	14-SOIC	Discontinued at DiGi Electronics	2V ~ 6V	2 µA	7.5ns	-40°C ~ 85°C	ROHS3 Compliant
SN74AC32DR	Texas Instruments	14-SOIC	Active	2V ~ 6V	2 µA	7.5ns	-40°C ~ 85°C	ROHS3 Compliant
SN74AC32NSR	Texas Instruments	14-SO	Active	2V ~ 6V	2 µA	7.5ns	-40°C ~ 85°C	ROHS3 Compliant

Engineering Selection Recommendations

Direct Electrical Equivalents (identical electrical specifications):

74AC32MTCX, 74AC32SCX, SN74AC32D, SN74AC32DR, and SN74AC32NSR are direct electrical equivalents to the 74AC32SJX. These parts maintain identical supply voltage range (2V ~ 6V), quiescent current (2 µA), output current (24mA), and propagation delay (7.5ns at 5V, 50pF). All active variants are ROHS3 compliant.

Package Considerations:

74AC32MTCX uses 14-TSSOP (0.173", 4.40mm width) — smallest footprint, requires PCB redesign
74AC32SCX and SN74AC32DR use 14-SOIC (0.154", 3.90mm width) — standard SOIC package
SN74AC32NSR uses 14-SO (0.209", 5.30mm width) — larger footprint, similar to original 14-SOP

Extended Operating Range Alternative:

CD74AC32M96 (Texas Instruments) operates across 1.5V ~ 5.5V supply voltage and -55°C ~ 125°C temperature range, exceeding the original specifications. However, quiescent current is 4 µA (double the original) and propagation delay is 9.5ns (slower). This part is suitable only when extended temperature or lower voltage operation is required.

Availability and Status:

For new designs and long-term production, select from active parts: 74AC32MTCX, 74AC32SCX, SN74AC32DR, or SN74AC32NSR. SN74AC32D is discontinued at DiGi Electronics and should not be selected for new designs despite remaining inventory.

Frequently Asked Questions (FAQ)

Q: Can I use any 74AC32 substitute in place of the 74AC32SJX?

A: Only if electrical parameters match. The 74AC32SJX requires 2V ~ 6V supply, 2 µA quiescent current, and 7.5ns propagation delay. CD74AC32M96 has different specifications (1.5V ~ 5.5V, 4 µA, 9.5ns) and is not a direct equivalent. Package type must also be compatible with your PCB layout.

Q: What is the difference between 14-SOP, 14-SOIC, 14-TSSOP, and 14-SO packages?

A: These are surface-mount package variants with identical pin configurations but different physical dimensions. 14-SOP (0.209" width) and 14-SO (0.209" width) are larger; 14-SOIC (0.154" width) is standard; 14-TSSOP (0.173" width) is compact. Substitution requires PCB footprint compatibility.

Q: Is the 74AC32SJX still available?

A: The 74AC32SJX is obsolete. Active alternatives include 74AC32MTCX, 74AC32SCX, SN74AC32DR, and SN74AC32NSR, all with current inventory.

Q: Do all substitutes have RoHS3 compliance?

A: All active substitute parts listed are ROHS3 compliant. The original 74AC32SJX does not specify RoHS status.

Q: Can I use CD74AC32M96 as a drop-in replacement?

A: CD74AC32M96 is electrically compatible but not a drop-in replacement. It has different quiescent current (4 µA vs. 2 µA) and propagation delay (9.5ns vs. 7.5ns). Use only if your circuit tolerates these parameter differences or requires extended temperature operation (-55°C ~ 125°C).

Q: Which substitute offers the best availability?

A: 74AC32SCX (onsemi) has the highest inventory at 18,786 pieces. SN74AC32DR (Texas Instruments) has 5,038 pieces. Both are active and ROHS3 compliant.

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