SP0503BAHT Equivalent & Substitute Parts

Part Overview

The SP0503BAHT is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This unidirectional, 3-channel Zener diode operates with a reverse standoff voltage of 5.5V and provides clamping at 8.5V maximum, housed in a SOT-143-4 surface mount package.

The SP0503BAHT is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this component.

Substiute Parts

SP0503BAHT

Littelfuse Inc.In Stock: 1489SP0503BAHT Datasheet

Current PartRFQ

SP0503BAHTG

LittelfuseIn Stock: 267818SP0503BAHTG Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SP0503BAHT is determined by strict equivalence across the following critical parameters:

• Voltage Rating: Reverse standoff voltage of 5.5V (Max) and clamping voltage of 8.5V (Max) @ Ipp
• Channel Configuration: 3 unidirectional channels
• Diode Type: Zener TVS diode
• Package: SOT-143-4 surface mount package (TO-253-4, TO-253AA case)
• Operating Temperature Range: -40°C to 85°C (TA)
• Application Class: General-purpose transient voltage suppression

The SP0503BAHTG qualifies as a direct substitute based on complete parameter alignment across all electrical and mechanical specifications. Both parts share identical voltage ratings, channel configuration, package geometry, and operating temperature range, enabling direct replacement in existing designs.

Parameter Comparison

Engineering Selection Recommendations

The SP0503BAHTG is the direct equivalent substitute for the obsolete SP0503BAHT. Both components are manufactured by Littelfuse and maintain identical electrical and mechanical specifications across all critical parameters.

Product Status Consideration: The SP0503BAHTG carries an Active product status with full manufacturing support and availability (267,806 pcs in stock), whereas the SP0503BAHT is obsolete with limited remaining inventory (1,442 pcs). For new designs and ongoing production, the SP0503BAHTG is the appropriate selection.

Compliance Consideration: The SP0503BAHTG achieves ROHS3 compliance and REACH unaffected status, providing enhanced environmental and regulatory alignment compared to the RoHS non-compliant SP0503BAHT. For applications subject to RoHS or REACH requirements, the SP0503BAHTG satisfies these mandates.

Packaging Availability: The SP0503BAHTG is available in Cut Tape (CT) and Digi-Reel® packaging formats, supporting both prototype and production-volume procurement workflows.

Frequently Asked Questions (FAQ)

Q: Can the SP0503BAHTG directly replace the SP0503BAHT in existing PCB designs?

A: Yes. The SP0503BAHTG is a direct substitute with identical electrical ratings (5.5V reverse standoff, 8.5V clamping), channel configuration (3 unidirectional), and package geometry (SOT-143-4). No PCB layout modifications are required.

Q: What are the key differences between SP0503BAHT and SP0503BAHTG?

A: The primary differences are product status and regulatory compliance. The SP0503BAHTG is an active product with ROHS3 compliance and REACH unaffected status, while the SP0503BAHT is obsolete and RoHS non-compliant. All electrical and mechanical parameters are identical.

Q: Why is the SP0503BAHT classified as obsolete?

A: The SP0503BAHT has been superseded by the SP0503BAHTG within Littelfuse's product portfolio. The SP0503BAHTG provides the same functionality with improved regulatory compliance and active manufacturing support.

Q: Are there inventory implications when switching from SP0503BAHT to SP0503BAHTG?

A: Yes. The SP0503BAHT has limited remaining inventory (1,442 pcs), while the SP0503BAHTG maintains substantial stock (267,806 pcs). For production continuity, transitioning to the SP0503BAHTG is recommended.

Q: Does the packaging format affect substitution compatibility?

A: No. Both parts use the SOT-143-4 surface mount package. The SP0503BAHTG offers additional packaging options (Cut Tape and Digi-Reel®) for procurement flexibility, but the physical package dimensions and pin configuration remain identical.

Q: Are there any temperature or environmental operating differences?

A: No. Both parts operate across the identical temperature range (-40°C to 85°C TA) and share the same Moisture Sensitivity Level (MSL 1 - Unlimited), ensuring equivalent performance in all environmental conditions.