VS3V3BB1FST40NB Equivalent & Substitute Parts

Part Overview

The VS3V3BB1FST40NB is a transient voltage suppressor (TVS) diode manufactured by Rohm Semiconductor, designed for general-purpose overvoltage protection applications. This component features a 3.3V reverse standoff voltage with a 7.6V maximum clamping voltage and 5A peak pulse current rating in a surface mount 0402 package.

The VS3V3BB1FST40NB is classified as obsolete. Identifying suitable substitute components is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this TVS diode specification.

Substiute Parts

VS3V3BB1FST40NB

Rohm SemiconductorIn Stock: 1140VS3V3BB1FST40NB Datasheet

Current PartRFQ

UCLAMP3331ZATFT

Semtech CorporationIn Stock: 80143UCLAMP3331ZATFT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute components for the VS3V3BB1FST40NB must satisfy the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Reverse standoff voltage: 3.3V (Max)
• Peak pulse current rating: 5A (8/20µs) minimum
• Bidirectional channel configuration: 1 channel
• Device type: Zener TVS diode
• Applications: General Purpose

Mechanical Compatibility Criteria:

• Mounting type: Surface Mount
• Acceptable package sizes: 0402 or smaller equivalent footprints

The UCLAMP3331ZATFT from Semtech Corporation meets these substitution criteria. Both devices maintain identical reverse standoff voltage (3.3V Max), equivalent peak pulse current capability (5A at 8/20µs), single bidirectional channel configuration, and surface mount construction suitable for general-purpose transient voltage suppression.

Parameter Comparison

Engineering Selection Recommendations

The UCLAMP3331ZATFT is a direct functional substitute for the obsolete VS3V3BB1FST40NB. Both components share identical reverse standoff voltage specifications (3.3V Max) and equivalent peak pulse current ratings (5A at 8/20µs), ensuring electrical compatibility in general-purpose transient voltage suppression applications.

The UCLAMP3331ZATFT carries active product status from Semtech Corporation, providing assured long-term supply availability compared to the obsolete Rohm component. Both devices maintain MSL 1 (Unlimited) moisture sensitivity classification and are suitable for surface mount assembly processes.

Design considerations include package footprint differences: the VS3V3BB1FST40NB uses a 0402 package, while the UCLAMP3331ZATFT uses a 0603 package. PCB layout modifications may be required to accommodate the larger footprint. The UCLAMP3331ZATFT exhibits a higher maximum clamping voltage (10V versus 7.6V) and lower peak pulse power rating (30W versus 38W), which may affect circuit protection characteristics in specific applications. The operating temperature range of the UCLAMP3331ZATFT (-40°C ~ 125°C) is narrower than the original component (-55°C ~ 150°C).

Frequently Asked Questions (FAQ)

Q: Can the UCLAMP3331ZATFT directly replace the VS3V3BB1FST40NB without circuit modifications?

A: Both components maintain identical reverse standoff voltage (3.3V Max) and peak pulse current specifications (5A at 8/20µs), satisfying the core electrical requirements for substitution. However, the package footprint differs (0603 versus 0402), requiring PCB layout adjustments. The higher clamping voltage (10V versus 7.6V) and narrower operating temperature range should be evaluated against specific circuit requirements.

Q: What are the key electrical parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: reverse standoff voltage (3.3V Max), peak pulse current rating (5A minimum at 8/20µs), bidirectional channel configuration (1 channel), device type (Zener TVS), and general-purpose application classification. These parameters ensure functional equivalence in transient voltage suppression circuits.

Q: Does the package size difference affect circuit performance?

A: The UCLAMP3331ZATFT uses a 0603 package compared to the 0402 package of the VS3V3BB1FST40NB. This larger footprint requires PCB layout modifications but does not affect electrical performance. Surface mount assembly processes remain compatible with standard manufacturing equipment.

Q: Are there compliance or certification differences between these components?

A: The VS3V3BB1FST40NB is ROHS3 compliant. Both components maintain MSL 1 (Unlimited) moisture sensitivity classification and carry EAR99 ECCN designation. Specific compliance documentation should be verified against application requirements.

Q: What operational differences should be considered when substituting?

A: The UCLAMP3331ZATFT exhibits a maximum clamping voltage of 10V compared to 7.6V for the original component, and a lower peak pulse power rating (30W versus 38W). The operating temperature range is -40°C ~ 125°C versus -55°C ~ 150°C. These differences should be evaluated against circuit design specifications and environmental operating conditions.