TSS721AD Equivalent & Substitute Parts

Part Overview

The TSS721AD is a half-duplex transceiver IC for Meter Bus protocol applications, manufactured by Texas Instruments in a 16-SOIC surface mount package. This component is classified as Last Time Buy, indicating limited future availability. Identifying equivalent and substitute parts is essential for design continuity, supply chain resilience, and long-term product support.

Substiute Parts

TSS721AD

Texas InstrumentsIn Stock: 1391TSS721AD Datasheet

Current PartRFQ

TSS721ADR

Texas InstrumentsIn Stock: 40999TSS721ADR Datasheet

MFR RecommendedRFQ

NCN5150DR2G

onsemiIn Stock: 28650NCN5150DR2G Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TSS721AD are identified based on strict electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

• Transceiver type with 1/1 driver/receiver configuration
• Half-duplex operation mode
• 16-SOIC package form factor (0.154", 3.90mm Width)
• Surface mount mounting type
• ROHS3 compliance and REACH unaffected status
• Compatible supply voltage range
• Meter Bus or M-Bus protocol support

Substitution Categories:

MFR Recommended Substitute: TSS721ADR (Texas Instruments) — Direct manufacturer alternative with identical electrical specifications and package, differentiated only by packaging format (Cut Tape & Digi-Reel vs. Tube).

Direct Manufacturer Substitute: NCN5150DR2G (onsemi) — Cross-manufacturer equivalent with compatible protocol (M-Bus), identical package, and overlapping electrical parameters within acceptable operating ranges.

Parameter Comparison

Engineering Selection Recommendations

TSS721ADR (MFR Recommended): This is the preferred substitute for TSS721AD. Both parts are manufactured by Texas Instruments with identical electrical specifications, operating temperature range, and supply voltage. The only difference is packaging format (Cut Tape & Digi-Reel vs. Tube). TSS721ADR maintains Active product status with significantly higher inventory availability (40,900 pcs vs. 1,310 pcs), ensuring supply continuity. Both parts maintain ROHS3 compliance and MSL 1 rating.

NCN5150DR2G (Cross-Manufacturer Alternative): This onsemi part provides a viable alternative when TSS721ADR availability is constrained. It maintains identical package geometry and transceiver configuration. The NCN5150DR2G operates across a wider supply voltage range (3.1V ~ 3.6V vs. 3.3V) and extended temperature range (-40°C ~ 85°C vs. 0°C ~ 70°C), providing greater operational flexibility. However, it carries MSL 2 rating (1 Year) versus MSL 1, requiring stricter moisture control during storage and handling. Both parts are ROHS3 compliant and REACH unaffected.

Frequently Asked Questions (FAQ)

Q: Can TSS721ADR be used as a direct replacement for TSS721AD?

A: Yes. TSS721ADR is electrically and functionally identical to TSS721AD. Both are Texas Instruments Meter Bus transceivers with 1/1 half-duplex configuration, 3.3V supply, 0°C ~ 70°C operating range, and 16-SOIC packaging. The difference is packaging format only (Cut Tape & Digi-Reel vs. Tube). No circuit modifications are required.

Q: What are the key differences between TSS721ADR and NCN5150DR2G?

A: Both parts share identical package geometry (16-SOIC), transceiver type (1/1 half-duplex), and ROHS3 compliance. NCN5150DR2G differs in: manufacturer (onsemi vs. Texas Instruments), protocol designation (M-Bus vs. Meter Bus), supply voltage range (3.1V ~ 3.6V vs. 3.3V), operating temperature range (-40°C ~ 85°C vs. 0°C ~ 70°C), and moisture sensitivity level (MSL 2 vs. MSL 1). The wider operating ranges of NCN5150DR2G may benefit applications requiring extended temperature or voltage tolerance.

Q: Why is MSL rating important when selecting a substitute?

A: Moisture Sensitivity Level (MSL) determines storage and handling requirements. TSS721AD and TSS721ADR carry MSL 1 (Unlimited shelf life), while NCN5150DR2G carries MSL 2 (1 Year maximum shelf life). MSL 2 components require controlled humidity storage and must be baked before reflow soldering if shelf life is exceeded. For applications with extended component storage periods, MSL 1 parts are preferred.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the 16-SOIC package with identical pin count and pitch (0.154", 3.90mm Width). Pin-to-pin compatibility is confirmed for direct PCB substitution without layout modifications.

Q: What is the significance of "Last Time Buy" status?

A: Last Time Buy indicates the manufacturer will discontinue production. TSS721AD and NCN5150DR2G both carry this status, meaning existing inventory is final. TSS721ADR is Active status, confirming ongoing production and long-term availability. For new designs or long-term production, TSS721ADR is the recommended choice.