SN74LS245DW Equivalent & Substitute Parts

Part Overview

The SN74LS245DW is a non-inverting transceiver logic integrated circuit manufactured by Texas Instruments. It functions as a single-element, 8-bit per element transceiver with 3-state output capability, housed in a 20-SOIC surface mount package. The device operates within the 4.75V to 5.25V supply voltage range and is rated for 0°C to 70°C operating temperature.

The SN74LS245DW carries a Last Time Buy product status, indicating that Texas Instruments has discontinued active production. This status necessitates identification of equivalent substitute parts to ensure design continuity and procurement availability for new builds and ongoing production requirements.

Substiute Parts

SN74LS245DW

Texas InstrumentsIn Stock: 2118SN74LS245DW Datasheet

Current PartRFQ

SN74LS245DWR

Texas InstrumentsIn Stock: 2510SN74LS245DWR Datasheet

MFR RecommendedRFQ

SN74LS645DW

Texas InstrumentsIn Stock: 1070SN74LS645DW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74LS245DW are identified based on strict electrical and mechanical parameter equivalence. The following criteria determine substitution validity:

Critical Equivalence 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: 4.75V ~ 5.25V
• Operating Temperature: 0°C ~ 70°C (TA)
• Package / Case: 20-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount

Substitute parts are grouped into two categories:

MFR Recommended Substitute: Parts recommended by the original manufacturer that maintain identical electrical specifications and package form factor but differ in packaging format (Cut Tape & Digi-Reel versus Tube).

Parametric Equivalent: Parts that maintain identical electrical and mechanical specifications but may carry different base product numbers within the same manufacturer series.

Parameter Comparison

Engineering Selection Recommendations

SN74LS245DWR (MFR Recommended Substitute): The SN74LS245DWR is the primary substitute for the SN74LS245DW. Both parts maintain identical electrical specifications, thermal ratings, and package form factor. The SN74LS245DWR carries Active product status from Texas Instruments, ensuring ongoing availability and supply chain continuity. The only distinction is packaging format: the SN74LS245DWR is supplied in Cut Tape and Digi-Reel format rather than Tube. This part is suitable for direct substitution in all applications where the SN74LS245DW was originally specified. Current inventory of 2462 units supports production requirements.

SN74LS645DW (Parametric Equivalent): The SN74LS645DW provides parametric equivalence with identical electrical performance and package specifications. However, this part carries Last Time Buy status, similar to the original SN74LS245DW, indicating limited future availability. The SN74LS645DW is suitable for substitution only when the SN74LS245DWR is unavailable and immediate procurement is required. Current inventory of 1026 units is available.

Both substitute parts maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements for the original design.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS245DWR be used as a direct replacement for the SN74LS245DW? A: Yes. The SN74LS245DWR is electrically and mechanically identical to the SN74LS245DW. Both parts feature the same 20-SOIC package, identical output current ratings (15mA high, 24mA low), and matching supply voltage range (4.75V ~ 5.25V). The only difference is packaging format: Cut Tape & Digi-Reel versus Tube. No circuit modifications are required.

Q: What is the difference between the SN74LS245DW and SN74LS645DW? A: Both parts are parametrically equivalent with identical electrical specifications and 20-SOIC package form factor. The difference lies in base product number designation within the 74LS series. Both are suitable for substitution based on electrical performance. However, the SN74LS245DWR is the preferred substitute due to its Active product status.

Q: Why is product status important for component selection? A: Product status indicates manufacturing availability and supply continuity. Active status means the manufacturer continues production and supports long-term supply. Last Time Buy status indicates discontinued production with limited remaining inventory. For new designs or long-term production, Active status parts are preferred to avoid future supply constraints.

Q: Are there any compliance or regulatory differences between these parts? A: No. All three parts (SN74LS245DW, SN74LS245DWR, and SN74LS645DW) maintain identical ROHS3 compliance, REACH unaffected status, and Moisture Sensitivity Level 1 (Unlimited). All parts meet the same regulatory requirements.

Q: Does packaging format affect circuit performance? A: No. Packaging format (Tube, Cut Tape, or Digi-Reel) affects only procurement and assembly handling. Electrical performance and package form factor remain identical. Selection between formats depends on manufacturing process requirements and inventory management practices.