DM74ALS20AMX Equivalent & Substitute Parts

Part Overview

The DM74ALS20AMX is a NAND Gate IC featuring 2 channels with 4 inputs per channel in a 14-SOIC surface mount package, manufactured by onsemi. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 74ALS logic family provides standard TTL-compatible switching functionality with specified electrical characteristics suitable for digital logic applications requiring NAND gate operations.

Key Parameters

Parameter	Value
Logic Type	NAND Gate
Number of Circuits	2
Number of Inputs	4
Voltage - Supply	4.5V ~ 5.5V
Current - Output High, Low	400µA, 8mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ V, Max CL	11ns @ 5V, 50pF
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the DM74ALS20AMX is determined by strict equivalence across the following parameters:

Logic Type: NAND Gate (2 channels, 4 inputs per channel)
Voltage Supply Range: 4.5V ~ 5.5V
Output Current Specifications: 400µA (high), 8mA (low)
Input Logic Levels: 0.8V (low), 2V (high)
Operating Temperature Range: 0°C ~ 70°C
Mounting Type: Surface Mount
Package Type: 14-SOIC or 14-SO

Substitute parts are grouped into two categories:

Direct Substitutes (Pin-Compatible, Identical Package): SN74ALS20AD and SN74ALS20ADR meet all electrical and mechanical specifications with identical 14-SOIC packaging.

Similar Substitute (Alternate Package): SN74ALS20ANSR provides equivalent electrical performance but uses a 14-SO package with different physical dimensions (0.209" vs 0.154" width), requiring PCB layout verification before implementation.

Parameter Comparison

Parameter	DM74ALS20AMX	SN74ALS20AD	SN74ALS20ADR	SN74ALS20ANSR
Manufacturer	onsemi	Texas Instruments	Texas Instruments	Texas Instruments
Logic Type	NAND Gate	NAND Gate	NAND Gate	NAND Gate
Number of Circuits	2	2	2	2
Number of Inputs	4	4	4	4
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Output High, Low	400µA, 8mA	400µA, 8mA	400µA, 8mA	400µA, 8mA
Input Logic Level - Low	0.8V	0.8V	0.8V	0.8V
Input Logic Level - High	2V	2V	2V	2V
Max Propagation Delay @ V, Max CL	11ns @ 5V, 50pF	12.5ns @ 5V, 50pF	12.5ns @ 5V, 50pF	12.5ns @ 5V, 50pF
Operating Temperature	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
Package / Case	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SO (0.209", 5.30mm Width)
Product Status	Obsolete	Last Time Buy	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Selection: SN74ALS20ADR is the recommended substitute. This part is manufactured by Texas Instruments with Active product status, ensuring long-term availability and supply chain stability. It maintains identical electrical specifications and 14-SOIC packaging, enabling direct PCB replacement without design modification. ROHS3 compliance supports modern manufacturing and environmental standards.

Secondary Selection: SN74ALS20AD provides equivalent electrical performance with Last Time Buy status from Texas Instruments. This part is suitable for applications where procurement timing allows for transition planning before end-of-life.

Alternate Package Option: SN74ALS20ANSR offers Active product status and identical electrical specifications but uses a 14-SO package with increased width (0.209" vs 0.154"). This part requires PCB layout verification and footprint modification before implementation.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS20ADR directly replace DM74ALS20AMX without PCB modification?

A: Yes. SN74ALS20ADR is pin-compatible and uses the identical 14-SOIC package with matching physical dimensions (0.154", 3.90mm width). Direct PCB replacement is possible without layout changes.

Q: What is the difference in propagation delay between DM74ALS20AMX and the substitute parts?

A: DM74ALS20AMX specifies 11ns maximum propagation delay at 5V with 50pF load. SN74ALS20AD, SN74ALS20ADR, and SN74ALS20ANSR specify 12.5ns under identical conditions. This 1.5ns difference remains within the 74ALS logic family specification and does not affect functional compatibility in standard TTL applications.

Q: Can SN74ALS20ANSR be used as a direct replacement?

A: SN74ALS20ANSR provides equivalent electrical performance but uses a 14-SO package with different physical dimensions (0.209" width vs 0.154" for 14-SOIC). PCB footprint modification is required. Verify board layout compatibility before selection.

Q: What is the significance of the Product Status field?

A: Product Status indicates supply availability. Active status (SN74ALS20ADR, SN74ALS20ANSR) ensures ongoing manufacturing and procurement. Last Time Buy status (SN74ALS20AD) indicates limited future availability. Obsolete status (DM74ALS20AMX) indicates discontinued production.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. SN74ALS20AD, SN74ALS20ADR, and SN74ALS20ANSR are all ROHS3 compliant, meeting environmental and manufacturing standards for modern applications.

Q: What packaging options are available for the 74ALS20 NAND gate?

A: Two package options are provided: 14-SOIC (0.154", 3.90mm width) used by SN74ALS20AD and SN74ALS20ADR, and 14-SO (0.209", 5.30mm width) used by SN74ALS20ANSR. Package selection depends on PCB design requirements and available board space.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message