DM74ALS5245WM Equivalent & Substitute Parts

Part Overview

The DM74ALS5245WM is a non-inverting buffer logic IC manufactured by onsemi, designed for 8-bit buffering applications with 3-state output capability. This device operates within the 74ALS logic family and is housed in a 20-SOIC surface mount package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	DM74ALS5245WM
Manufacturer	onsemi
Logic Type	Buffer, Non-Inverting
Number of Elements	1
Number of Bits per Element	8
Output Type	3-State
Current - Output High, Low	15mA, 24mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the DM74ALS5245WM is determined by strict alignment of the following electrical and mechanical parameters:

Logic family: 74ALS series
Logic function: Buffer or Transceiver, Non-Inverting
Number of elements: 1
Bits per element: 8
Output configuration: 3-State
Output current ratings: 15mA (high), 24mA (low)
Supply voltage range: 4.5V ~ 5.5V
Operating temperature: 0°C ~ 70°C
Package type: 20-SOIC or 20-SO surface mount

Substitute parts are grouped into two categories: parametric equivalents (identical logic function and electrical specifications) and similar alternatives (transceiver variants with compatible electrical parameters and package footprints).

Parameter Comparison

Part Number	Manufacturer	Logic Type	Package	Output Current (High/Low)	Supply Voltage	Operating Temp	Product Status	RoHS Status
DM74ALS5245WM	onsemi	Buffer, Non-Inverting	20-SOIC (7.50mm)	15mA / 24mA	4.5V ~ 5.5V	0°C ~ 70°C	Obsolete	REACH Unaffected
SN74ALS541DW	Texas Instruments	Buffer, Non-Inverting	20-SOIC (7.50mm)	15mA / 24mA	4.5V ~ 5.5V	0°C ~ 70°C	Last Time Buy	ROHS3 Compliant
SN74ALS245A-1DW	Texas Instruments	Transceiver, Non-Inverting	20-SOIC (7.50mm)	15mA / 24mA	4.5V ~ 5.5V	0°C ~ 70°C	Last Time Buy	ROHS3 Compliant
SN74ALS245A-1DWR	Texas Instruments	Transceiver, Non-Inverting	20-SOIC (7.50mm)	15mA / 24mA	4.5V ~ 5.5V	0°C ~ 70°C	Active	ROHS3 Compliant
SN74ALS245A-1NSR	Texas Instruments	Transceiver, Non-Inverting	20-SO (5.30mm)	15mA / 24mA	4.5V ~ 5.5V	0°C ~ 70°C	Active	ROHS3 Compliant
SN74ALS245ANSR	Texas Instruments	Transceiver, Non-Inverting	20-SO (5.30mm)	15mA / 24mA	4.5V ~ 5.5V	0°C ~ 70°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Parametric Equivalent (Primary Choice): SN74ALS541DW from Texas Instruments is the parametric equivalent to DM74ALS5245WM. Both devices are non-inverting buffers with identical electrical specifications and 20-SOIC packaging. The SN74ALS541DW maintains Last Time Buy status and is ROHS3 compliant, providing regulatory compliance advantages over the obsolete onsemi part.

Active Alternatives (Long-Term Availability): SN74ALS245A-1DWR and SN74ALS245A-1NSR are active production parts from Texas Instruments. While these are transceiver variants rather than buffers, they meet all electrical parameter requirements and are available in compatible surface mount packages. The -1DWR variant uses the same 20-SOIC (7.50mm) footprint as the original part, while the -1NSR variant uses a narrower 20-SO (5.30mm) package.

Packaging Considerations: Parts designated with "DW" suffix use 20-SOIC packaging (0.295" width, 7.50mm). Parts designated with "NSR" suffix use 20-SO packaging (0.209" width, 5.30mm). Direct footprint compatibility exists between DM74ALS5245WM and SN74ALS541DW or SN74ALS245A-1DW. The narrower 20-SO package variants require PCB layout verification for pin-to-pin compatibility.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS245A-1DWR directly replace DM74ALS5245WM? A: Yes. Both parts share identical electrical specifications (15mA/24mA output current, 4.5V–5.5V supply, 0°C–70°C operating range) and use the same 20-SOIC (7.50mm) package footprint. The primary functional difference is that SN74ALS245A-1DWR is a transceiver rather than a buffer, but this does not prevent substitution in applications requiring non-inverting 8-bit logic with 3-state output.

Q: What is the difference between 20-SOIC and 20-SO packages? A: Both are surface mount packages with 20 pins, but differ in width. The 20-SOIC (0.295", 7.50mm) is wider than the 20-SO (0.209", 5.30mm). DM74ALS5245WM uses the wider 20-SOIC package. Substitutes using the narrower 20-SO package require PCB layout verification to ensure pin alignment and spacing compatibility.

Q: Why is SN74ALS541DW preferred over transceiver alternatives? A: SN74ALS541DW is a parametric equivalent buffer, matching the original part's logic function exactly. Transceiver variants (SN74ALS245A series) are functionally compatible but introduce additional circuit complexity. For direct replacement in existing designs, the buffer equivalent is the preferred choice.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All Texas Instruments substitute parts listed (SN74ALS541DW, SN74ALS245A-1DW, SN74ALS245A-1DWR, SN74ALS245A-1NSR, SN74ALS245ANSR) are ROHS3 compliant. The original onsemi part (DM74ALS5245WM) is REACH unaffected but does not carry ROHS3 certification.

Q: Which substitute offers the longest production availability? A: SN74ALS245A-1DWR and SN74ALS245ANSR carry Active product status, indicating ongoing production. SN74ALS541DW is Last Time Buy, indicating limited future availability. For new designs requiring long-term supply assurance, active production parts are recommended.

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