DM74LS32M OR Gate IC Equivalent & Substitute Parts

Part Overview

The DM74LS32M is a 4-channel 2-input OR gate logic IC manufactured by onsemi in 14-SOIC surface mount packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 74LS32 logic family provides standard TTL-compatible OR gate functionality suitable for digital logic applications requiring 4.75V to 5.25V supply voltage operation.

Key Parameters

Parameter	Value
Logic Type	OR Gate
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	4.75V ~ 5.25V
Current - Output High, Low	400µA, 8mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ V, Max CL	15ns @ 5V, 50pF
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
Series	74LS

Substitute Part Grouping Explanation

Substitution of the DM74LS32M is determined by strict equivalence across the following parameters: logic type (OR gate), number of circuits (4), number of inputs per circuit (2), supply voltage range (4.75V ~ 5.25V), output current specifications (400µA high, 8mA low), input logic levels (0.8V low, 2V high), operating temperature range (0°C ~ 70°C), and mounting type (surface mount). Package variations within the 14-SOIC family are permitted substitutes when mechanical dimensions remain compatible with board layout constraints.

The substitute parts are grouped as follows:

Direct Equivalents (14-SOIC, 0.154" width): SN74LS32D and SN74LS32DR maintain identical package dimensions and pinout compatibility with the DM74LS32M.

Similar Equivalents (14-SO, 0.209" width): SN74LS32NSR and SN74LS32NSRG4 provide functional equivalence with a wider 14-SO package variant. These parts maintain all electrical specifications but differ in physical package width, requiring verification of PCB layout compatibility.

Parameter Comparison

Parameter	DM74LS32M (onsemi)	SN74LS32D (TI)	SN74LS32DR (TI)	SN74LS32NSR (TI)	SN74LS32NSRG4 (TI)
Logic Type	OR Gate	OR Gate	OR Gate	OR Gate	OR Gate
Number of Circuits	4	4	4	4	4
Number of Inputs	2	2	2	2	2
Voltage - Supply	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
Current - Output High, Low	400µA, 8mA	400µA, 8mA	400µA, 8mA	400µA, 8mA	400µA, 8mA
Input Logic Level - Low	0.8V	0.8V	0.8V	0.8V	0.8V
Input Logic Level - High	2V	2V	2V	2V	2V
Max Propagation Delay @ V, Max CL	15ns @ 5V, 50pF	22ns @ 5V, 15pF	22ns @ 5V, 15pF	22ns @ 5V, 15pF	22ns @ 5V, 15pF
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.209", 5.30mm)	14-SOIC (0.209", 5.30mm)
Product Status	Obsolete	Discontinued at DiGi Electronics	Active	Active	Discontinued at DiGi Electronics
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For new designs and ongoing procurement, SN74LS32DR (Texas Instruments) is the primary recommended substitute. This part maintains identical 14-SOIC (0.154", 3.90mm width) package dimensions, carries active product status, and meets ROHS3 compliance requirements. Current inventory availability is 9700 units.

SN74LS32NSR and SN74LS32NSRG4 provide functional equivalence with the wider 14-SO (0.209", 5.30mm width) package variant. These parts are suitable only when PCB layout accommodates the increased package width. SN74LS32NSR maintains active product status with 5094 units in stock. SN74LS32NSRG4 is discontinued at DiGi Electronics with 815 units available.

SN74LS32D is discontinued at DiGi Electronics with 860 units in stock and should be considered only when SN74LS32DR is unavailable.

All substitute parts maintain electrical equivalence across supply voltage, logic levels, output current, and operating temperature specifications. The DM74LS32M exhibits faster propagation delay (15ns) compared to Texas Instruments substitutes (22ns), a difference that does not affect functional compatibility in standard TTL logic applications.

Frequently Asked Questions (FAQ)

Q: Can SN74LS32DR directly replace DM74LS32M without PCB modification?

A: Yes. SN74LS32DR maintains identical 14-SOIC (0.154", 3.90mm width) package dimensions, pinout, and electrical specifications. No PCB layout changes are required.

Q: What is the difference between SN74LS32DR and SN74LS32NSR?

A: Both parts provide identical OR gate logic functionality and electrical performance. The primary difference is package width: SN74LS32DR uses 14-SOIC (0.154", 3.90mm), while SN74LS32NSR uses 14-SOIC (0.209", 5.30mm). PCB footprint compatibility must be verified before substitution.

Q: Why does DM74LS32M show faster propagation delay than the Texas Instruments substitutes?

A: The DM74LS32M specifies 15ns propagation delay at 50pF load, while Texas Instruments parts specify 22ns at 15pF load. These measurements reflect different test conditions. Both specifications meet standard 74LS logic performance requirements and are functionally equivalent for digital logic applications.

Q: Are all substitute parts RoHS compliant?

A: The DM74LS32M is RoHS non-compliant. All Texas Instruments substitutes (SN74LS32D, SN74LS32DR, SN74LS32NSR, SN74LS32NSRG4) are ROHS3 compliant.

Q: Which substitute part has the best current availability?

A: SN74LS32DR has the highest inventory with 9700 units in stock and maintains active product status, making it the most reliable long-term substitute option.

Q: Can I use SN74LS32NSRG4 as a substitute?

A: SN74LS32NSRG4 provides functional equivalence but is discontinued at DiGi Electronics. Use only when SN74LS32DR and SN74LS32NSR are unavailable and inventory constraints permit. Verify 14-SO (0.209", 5.30mm width) package compatibility with your PCB layout.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message