SN74ALS245ADW Equivalent & Substitute Parts

Part Overview

The SN74ALS245ADW is a non-inverting transceiver logic IC manufactured by Texas Instruments, designed for 8-bit bidirectional data transfer with 3-state output capability. This device operates within a 4.5V to 5.5V supply voltage range and is housed in a 20-SOIC surface mount package. The SN74ALS245ADW is classified as Last Time Buy, indicating limited availability and the necessity to identify equivalent alternatives for ongoing production requirements or future design revisions.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Logic Type	Transceiver, Non-Inverting
Number of Elements	1
Number of Bits per Element	8
Output Type	3-State
Current - Output High	15mA
Current - Output Low	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
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN74ALS245ADW is determined by strict equivalence across the following critical parameters:

Logic Type: Transceiver, 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)
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

All substitute parts listed maintain identical electrical and mechanical specifications. Variations in packaging format (Tube vs. Tape & Reel) and product status do not affect functional compatibility. Base product numbers may differ (74ALS245, 74ALS645, 74ALS623) while maintaining full parametric equivalence.

Parameter Comparison

Part Number	Manufacturer	Base Product	Packaging	Product Status	Inventory (Pcs)	Logic Type	Bits per Element	Output Type	Supply Voltage	Package / Case
SN74ALS245ADW	Texas Instruments	74ALS245	Tube	Last Time Buy	2550	Transceiver, Non-Inverting	8	3-State	4.5V ~ 5.5V	20-SOIC
SN74ALS245A-1DWR	Texas Instruments	74ALS245	Tape & Reel (TR)	Active	731	Transceiver, Non-Inverting	8	3-State	4.5V ~ 5.5V	20-SOIC
SN74ALS245A-1DW	Texas Instruments	74ALS245	Tube	Last Time Buy	2400	Transceiver, Non-Inverting	8	3-State	4.5V ~ 5.5V	20-SOIC
SN74ALS645A-1DW	Texas Instruments	74ALS645	Tube	Last Time Buy	1193	Transceiver, Non-Inverting	8	3-State	4.5V ~ 5.5V	20-SOIC
SN74ALS623ADW	Texas Instruments	74ALS623	Tube	Active	759	Transceiver, Non-Inverting	8	3-State	4.5V ~ 5.5V	20-SOIC
SN74ALS645ADW	Texas Instruments	74ALS645	Tube	Last Time Buy	1007	Transceiver, Non-Inverting	8	3-State	4.5V ~ 5.5V	20-SOIC

Engineering Selection Recommendations

For applications currently using the SN74ALS245ADW, the following selection criteria apply based on product status and availability:

Active Status Priority: SN74ALS245A-1DWR and SN74ALS623ADW maintain Active product status, ensuring long-term availability and continued manufacturing support. SN74ALS245A-1DWR is the manufacturer-recommended substitute, available in Tape & Reel packaging suitable for automated assembly processes.

Last Time Buy Alternatives: SN74ALS245A-1DW, SN74ALS645A-1DW, and SN74ALS645ADW are classified as Last Time Buy. These parts maintain full parametric equivalence but have limited remaining inventory and no future production commitment.

Packaging Considerations: Tube packaging is suitable for manual assembly and lower-volume applications. Tape & Reel packaging (SN74ALS245A-1DWR) is optimized for high-volume automated manufacturing.

Compliance: All substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard PCB assembly and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS245A-1DWR be used as a direct replacement for SN74ALS245ADW?

A: Yes. Both parts are parametrically equivalent across all critical electrical and mechanical specifications. The primary difference is packaging format: SN74ALS245A-1DWR is supplied in Tape & Reel format, while SN74ALS245ADW is supplied in Tube format. SN74ALS245A-1DWR is the manufacturer-recommended substitute and maintains Active product status.

Q: What is the difference between 74ALS245, 74ALS645, and 74ALS623 base product numbers?

A: All three base product numbers maintain identical electrical specifications for this application: non-inverting transceiver, 1 element, 8 bits per element, 3-state output, and 4.5V to 5.5V supply voltage. The base product number variation does not affect functional compatibility or pin configuration within the 20-SOIC package.

Q: Are there any restrictions on mixing Tube and Tape & Reel packaged parts in production?

A: No. Both packaging formats contain identical die and electrical performance. Packaging format selection is determined by assembly process requirements. Tube packaging is used for manual or lower-volume assembly; Tape & Reel is used for automated high-volume production.

Q: What does "Last Time Buy" status mean for the SN74ALS245ADW?

A: Last Time Buy indicates that Texas Instruments has announced end-of-life for this specific part number. No new production is scheduled after existing inventory is depleted. Active alternatives such as SN74ALS245A-1DWR should be selected for new designs or long-term production requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) rating, meeting standard environmental and moisture sensitivity requirements for PCB assembly and storage.

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