SN74AC32PW Equivalent & Substitute Parts

Part Overview

The SN74AC32PW is a 4-channel 2-input OR gate logic IC manufactured by Texas Instruments in a 14-TSSOP surface mount package. This part is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and procurement. The device operates across a 2V to 6V supply voltage range and is suitable for general-purpose logic applications requiring OR gate functionality.

Key Parameters

Parameter	Value
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
Package / Case	14-TSSOP (0.173", 4.40mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SN74AC32PW is determined by strict equivalence across the following critical parameters:

Logic Type: OR Gate with 4 channels and 2 inputs per channel
Voltage Supply Range: 2V ~ 6V
Output Drive Capability: 24mA high and low
Input Logic Thresholds: 0.9V ~ 1.65V (low), 2.1V ~ 3.85V (high)
Propagation Delay: 7.5ns @ 5V, 50pF
Operating Temperature Range: -40°C ~ 85°C
Package: 14-TSSOP surface mount
Compliance: ROHS3, MSL Level 1

All substitute parts listed maintain identical electrical specifications and package compatibility with the original SN74AC32PW, ensuring direct functional replacement in circuit designs.

Parameter Comparison

Part Number	Manufacturer	Product Status	Packaging	Quiescent Current (Max)	Propagation Delay	Inventory
SN74AC32PW	Texas Instruments	Discontinued	Tube	2 µA	7.5ns @ 5V, 50pF	1599 Pcs
SN74AC32PWR	Texas Instruments	Active	Cut Tape (CT) & Digi-Reel®	2 µA	7.5ns @ 5V, 50pF	3520 Pcs
74AC32MTCX	onsemi	Active	Tape & Reel (TR)	2 µA	7.5ns @ 5V, 50pF	10796 Pcs
MC74AC32DTR2G	onsemi	Active	Tape & Reel (TR)	4 µA	7.5ns @ 5V, 50pF	2637 Pcs

Engineering Selection Recommendations

For applications requiring the SN74AC32PW, the following selection criteria apply based on product status and availability:

Primary Recommendation: SN74AC32PWR (Texas Instruments) maintains identical electrical specifications and quiescent current performance as the original SN74AC32PW. This part is actively manufactured and available in higher quantities, providing continuity with the original design intent.

Secondary Recommendation: 74AC32MTCX (onsemi) offers the same electrical performance with the highest current inventory. This part is suitable for designs where manufacturer diversity is acceptable and supply chain resilience is prioritized.

Alternative Option: MC74AC32DTR2G (onsemi) is functionally equivalent with a maximum quiescent current specification of 4 µA, compared to 2 µA for the primary options. This part remains suitable for applications where the slightly elevated quiescent current does not impact system performance or power budget constraints.

All substitute parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can SN74AC32PWR be used as a direct replacement for SN74AC32PW?

A: Yes. SN74AC32PWR is electrically and functionally identical to SN74AC32PW. Both parts share the same logic specifications, voltage supply range, output drive capability, and propagation delay characteristics. The primary difference is packaging format (Cut Tape & Digi-Reel® versus Tube) and active product status.

Q: What is the difference between the Texas Instruments and onsemi substitute parts?

A: All substitute parts maintain identical logic functionality and electrical performance. The differences are manufacturer source and packaging format. Texas Instruments parts (SN74AC32PWR) provide continuity with the original design source. onsemi parts (74AC32MTCX, MC74AC32DTR2G) offer alternative sourcing with comparable specifications.

Q: Is MC74AC32DTR2G suitable if the quiescent current is higher at 4 µA?

A: MC74AC32DTR2G is functionally equivalent and suitable for most applications. The 4 µA quiescent current specification is within acceptable limits for standard logic applications. Selection depends on specific power budget requirements. If quiescent current must not exceed 2 µA, use SN74AC32PWR or 74AC32MTCX instead.

Q: Are all substitute parts available in the same 14-TSSOP package?

A: Yes. All substitute parts use the 14-TSSOP (0.173", 4.40mm Width) surface mount package, ensuring mechanical and electrical compatibility with existing PCB designs.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. All substitute parts are ROHS3 compliant with MSL Level 1 rating, meeting standard industrial and commercial manufacturing requirements.

Q: Which substitute part has the best availability?

A: 74AC32MTCX (onsemi) currently has the highest inventory at 10,796 pieces, followed by SN74AC32PWR (Texas Instruments) at 3,520 pieces.

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