SN74LVC138ADRE4 Equivalent & Substitute Parts

Part Overview

The SN74LVC138ADRE4 is a decoder/demultiplexer integrated circuit manufactured by Texas Instruments, featuring a 1 x 3:8 configuration in a 16-SOIC surface mount package. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement. The device operates across a single supply voltage range of 1.65V to 3.6V with output currents of 24mA for both high and low states, suitable for logic-level signal routing and decoding applications.

Substiute Parts

SN74LVC138ADRE4

Texas InstrumentsIn Stock: 724SN74LVC138ADRE4 Datasheet

Current PartRFQ

SN74LVC138ADR

Texas InstrumentsIn Stock: 130276SN74LVC138ADR Datasheet

Parametric EquivalentRFQ

SN74LVC138ADT

Texas InstrumentsIn Stock: 1824SN74LVC138ADT Datasheet

Parametric EquivalentRFQ

MC74LCX138DR2G

onsemiIn Stock: 8711MC74LCX138DR2G Datasheet

DirectRFQ

74LCX138MX

Fairchild SemiconductorIn Stock: 1656674LCX138MX Datasheet

MFR RecommendedRFQ

74LVC138AD,118

Nexperia USA Inc.In Stock: 1004574LVC138AD,118 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN74LVC138ADRE4 is determined by strict equivalence across the following parameters: decoder/demultiplexer type with 1 x 3:8 circuit configuration, 16-SOIC package format, surface mount mounting type, output current specifications of 24mA for both high and low states, and compatible voltage supply ranges. Parts are grouped into three categories based on manufacturer and product status:

Parametric Equivalents (Texas Instruments 74LVC Series): SN74LVC138ADR and SN74LVC138ADT maintain identical electrical specifications and package format as the main part, differing only in packaging format (Cut Tape/Digi-Reel versus Tape & Reel). Both are active products with full inventory availability.

Direct Manufacturer Substitute (onsemi 74LCX Series): MC74LCX138DR2G provides functional equivalence with identical circuit configuration and package, with a minimum voltage supply of 2V (versus 1.65V for the main part). This represents a minor specification variance within acceptable operating ranges.

Manufacturer Recommended Alternatives (Fairchild Semiconductor and Nexperia): 74LCX138MX and 74LVC138AD,118 offer functional equivalence with package compatibility. The Nexperia part extends the operating temperature range to 125°C and supports a lower minimum voltage of 1.2V.

Parameter Comparison

Engineering Selection Recommendations

For direct replacement of the discontinued SN74LVC138ADRE4, the SN74LVC138ADR and SN74LVC138ADT are the primary choices, as both are active Texas Instruments products with identical electrical and mechanical specifications. These parts differ only in packaging format and inventory availability, with SN74LVC138ADR offering significantly higher stock levels (130,200 pcs) compared to SN74LVC138ADT (1,732 pcs).

The MC74LCX138DR2G from onsemi provides functional equivalence with the constraint that its minimum supply voltage is 2V rather than 1.65V. This part is suitable for applications where the supply voltage remains above 2V throughout operation.

The 74LVC138AD,118 from Nexperia offers extended operating temperature range to 125°C and lower minimum supply voltage of 1.2V, making it suitable for applications requiring broader temperature or voltage operating margins. All substitute parts maintain ROHS3 compliance and are currently in active production status.

Frequently Asked Questions (FAQ)

Q: Can I use SN74LVC138ADR as a direct replacement for SN74LVC138ADRE4?

A: Yes. Both parts are Texas Instruments 74LVC138 decoders with identical electrical specifications, circuit configuration (1 x 3:8), package format (16-SOIC), and operating parameters. The difference is packaging format: ADR uses Cut Tape/Digi-Reel while ADRE4 uses a different reel format. Electrical performance and pinout are identical.

Q: What is the difference between SN74LVC138ADR and SN74LVC138ADT?

A: Both parts are electrically identical Texas Instruments 74LVC138 decoders. The difference is packaging: ADR is supplied in Cut Tape and Digi-Reel format, while ADT is supplied in Tape & Reel format. Selection depends on your procurement and assembly requirements.

Q: Can I substitute MC74LCX138DR2G for the SN74LVC138ADRE4?

A: MC74LCX138DR2G is functionally equivalent with identical circuit configuration and package. The key difference is minimum supply voltage: MC74LCX138DR2G requires minimum 2V, while SN74LVC138ADRE4 operates down to 1.65V. Use this substitute only if your application supply voltage remains above 2V.

Q: Why does 74LVC138AD,118 have a different operating temperature range?

A: The 74LVC138AD,118 from Nexperia is rated for -40°C to 125°C, compared to -40°C to 85°C for the main part. This extended range is a specification of the Nexperia product line and does not affect compatibility. It provides additional margin for high-temperature applications.

Q: Are all substitute parts RoHS compliant?

A: SN74LVC138ADR, SN74LVC138ADT, MC74LCX138DR2G, and 74LVC138AD,118 are all ROHS3 compliant. The 74LCX138MX from Fairchild Semiconductor does not specify RoHS status in the provided data.

Q: What is the difference between 74LVC and 74LCX series?

A: Both are logic decoder/demultiplexer series with identical circuit configurations and packages. The 74LCX series (onsemi and Fairchild) specifies a minimum supply voltage of 2V, while the 74LVC series (Texas Instruments and Nexperia) supports lower minimum voltages (1.65V or 1.2V). Functional operation and pinout are equivalent.