DM74LS125AM Equivalent & Substitute Parts

Part Overview

The DM74LS125AM is a non-inverting buffer logic IC manufactured by onsemi, featuring 4 elements with 1 bit per element in a 14-SOIC package. This component operates within the 74LS logic family and is classified as obsolete. Due to its obsolete status, equivalent substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. The substitute parts maintain functional and electrical compatibility while offering improved availability and compliance status.

Key Parameters

Parameter	Value
Logic Type	Buffer, Non-Inverting
Number of Elements	4
Number of Bits per Element	1
Current - Output High, Low	2.6mA, 24mA
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	14-SOIC
Series	74LS

Substitute Part Grouping Explanation

Substitution of the DM74LS125AM is determined by strict alignment of the following electrical and mechanical parameters:

Logic Type: Buffer, Non-Inverting
Number of Elements: 4
Number of Bits per Element: 1
Current - Output High, Low: 2.6mA, 24mA
Voltage - Supply: 4.75V ~ 5.25V
Operating Temperature: 0°C ~ 70°C (TA)
Package / Case: 14-SOIC (0.154", 3.90mm Width)
Series: 74LS

The substitute parts are classified into two categories:

Direct Substitutes (Identical Package): SN74LS125AD and SN74LS125ADR maintain the exact 14-SOIC (0.154", 3.90mm Width) package specification and are pin-compatible replacements.

Similar Substitute (Package Variant): SN74LS125ANSR uses a 14-SO (0.209", 5.30mm Width) package, which differs in width but maintains the same pin count and electrical characteristics. This variant requires PCB layout verification for footprint compatibility.

Parameter Comparison

Parameter	DM74LS125AM	SN74LS125AD	SN74LS125ADR	SN74LS125ANSR
Manufacturer	onsemi	Texas Instruments	Texas Instruments	Texas Instruments
Logic Type	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting
Number of Elements	4	4	4	4
Number of Bits per Element	1	1	1	1
Output Type	Standard	3-State	3-State	3-State
Current - Output High, Low	2.6mA, 24mA	2.6mA, 24mA	2.6mA, 24mA	2.6mA, 24mA
Voltage - Supply	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)
Package / Case	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SO (0.209", 5.30mm)
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	Vendor Undefined	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement: SN74LS125ADR is the preferred substitute. It is manufactured by Texas Instruments, maintains active product status, achieves ROHS3 compliance, and provides identical electrical and mechanical specifications to the DM74LS125AM. The part is available in Cut Tape and Digi-Reel packaging formats.

Alternative Direct Replacement: SN74LS125AD offers equivalent electrical performance and active status from Texas Instruments. Packaging is supplied in Bulk format. Moisture sensitivity level is vendor-undefined, whereas the DM74LS125AM and SN74LS125ADR specify MSL 1 (Unlimited).

Package Variant Option: SN74LS125ANSR provides electrical equivalence with ROHS3 compliance and active product status. The 14-SO package (0.209", 5.30mm width) differs from the original 14-SOIC (0.154", 3.90mm width). This variant requires PCB footprint verification before implementation.

Frequently Asked Questions (FAQ)

Q: Can SN74LS125AD directly replace DM74LS125AM? A: Yes. Both parts share identical electrical specifications (4.75V ~ 5.25V supply, 2.6mA/24mA output current, 0°C ~ 70°C operating range) and the same 14-SOIC package footprint. The primary difference is packaging format (Bulk vs. original specification) and vendor-undefined moisture sensitivity.

Q: What is the difference between SN74LS125AD and SN74LS125ADR? A: Both are Texas Instruments SN74LS125A parts with identical electrical and pin specifications. SN74LS125ADR is supplied in Cut Tape and Digi-Reel format with ROHS3 compliance and MSL 1 rating. SN74LS125AD is supplied in Bulk format with vendor-undefined moisture sensitivity. For new designs, SN74LS125ADR is recommended.

Q: Is SN74LS125ANSR compatible with the original DM74LS125AM footprint? A: Electrical compatibility is confirmed. However, the package differs: SN74LS125ANSR uses 14-SO (0.209", 5.30mm width) versus the original 14-SOIC (0.154", 3.90mm width). PCB layout and footprint must be verified for mechanical fit before use.

Q: Why do the substitute parts specify 3-State output while the original lists standard output? A: All parts in the 74LS125 family feature 3-State output capability. The electrical and functional characteristics remain equivalent for applications requiring standard or tri-state operation.

Q: Are the substitute parts RoHS compliant? A: SN74LS125ADR and SN74LS125ANSR are ROHS3 compliant. SN74LS125AD has vendor-undefined RoHS status. The original DM74LS125AM is RoHS non-compliant. For applications requiring RoHS compliance, SN74LS125ADR or SN74LS125ANSR are required.

Q: What is the moisture sensitivity level (MSL) of the substitute parts? A: SN74LS125ADR and SN74LS125ANSR specify MSL 1 (Unlimited), matching the original DM74LS125AM. SN74LS125AD has vendor-undefined MSL. For controlled storage and handling requirements, refer to the specific manufacturer datasheet.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message