SP1044-01WTG Equivalent & Substitute Parts

Part Overview

The SP1044-01WTG is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface mount applications. This unidirectional Zener-type TVS diode features a 6V reverse standoff voltage and 9.3V clamping voltage, with a peak pulse current rating of 3A (8/20µs). The component is packaged in 01005 (0402 Metric) flip chip format.

The SP1044-01WTG is classified as Obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this component.

Substiute Parts

SP1044-01WTG

Littelfuse Inc.In Stock: 20383SP1044-01WTG Datasheet

Current PartRFQ

SP1020-01WTG

Littelfuse Inc.In Stock: 17980SP1020-01WTG Datasheet

MFR RecommendedRFQ

1N4733 G

Microsemi CorporationIn Stock: 11331N4733 G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SP1044-01WTG is determined by the following critical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff: 6V (Max)
• Voltage - Clamping: Within acceptable range for the application (9.3V reference)
• Current - Peak Pulse: Minimum 2A (8/20µs) to maintain protection capability
• Unidirectional configuration: Single channel Zener-type TVS
• Package / Case: 01005 (0402 Metric) surface mount
• Operating Temperature: -40°C ~ 125°C minimum
• RoHS Compliance: ROHS3 Compliant

Substitute Parts Identified:

1. SP1020-01WTG (Littelfuse Inc.) – Manufacturer-recommended substitute. Active product status. Maintains identical reverse standoff voltage (6V), comparable clamping voltage (10V), and compatible package format (01005, 2-FlipChip). Peak pulse current rated at 2A (8/20µs).

2. 1N4733 G (Microsemi Corporation) – Alternative Zener diode with 5.1V nominal Zener voltage. Through-hole package (DO-204AL). Not recommended as direct substitute due to package incompatibility and different electrical characteristics.

Parameter Comparison

Engineering Selection Recommendations

SP1020-01WTG is the primary substitute for SP1044-01WTG. Both components are manufactured by Littelfuse Inc. within the SPA® series, share identical reverse standoff voltage (6V), operate within the same temperature range (-40°C ~ 125°C), and maintain ROHS3 compliance. The SP1020-01WTG is currently in Active product status, ensuring long-term availability and supply chain continuity. The clamping voltage differential (10V vs. 9.3V) and peak pulse current reduction (2A vs. 3A) remain within acceptable substitution parameters for general-purpose overvoltage protection applications. Both components utilize compatible 01005 (0402 Metric) surface mount packaging.

1N4733 G is not recommended as a direct substitute. While both are Zener diodes, the 1N4733 G operates with a 5.1V nominal Zener voltage, differs significantly in electrical characteristics, utilizes through-hole packaging (DO-204AL), and carries RoHS non-compliant status. This component is suitable only for applications with fundamentally different voltage protection requirements and board-level integration approaches.

Frequently Asked Questions (FAQ)

Q: Can SP1020-01WTG directly replace SP1044-01WTG in existing designs?

A: SP1020-01WTG is the manufacturer-recommended substitute. Both components share the same reverse standoff voltage (6V), operating temperature range (-40°C ~ 125°C), package format (01005, 0402 Metric), and RoHS compliance status. The primary differences are clamping voltage (10V vs. 9.3V) and peak pulse current (2A vs. 3A). Design validation is required to confirm these parameter variations are acceptable for the specific application.

Q: Why is 1N4733 G listed if it is not recommended?

A: 1N4733 G is included for reference purposes to demonstrate why package and electrical parameter compatibility are critical substitution criteria. The through-hole package format (DO-204AL) is incompatible with surface mount PCB designs. The 5.1V Zener voltage and RoHS non-compliant status further disqualify it as a substitute for the SP1044-01WTG.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution eligibility is determined by: reverse standoff voltage (6V), clamping voltage range, peak pulse current capability (minimum 2A), unidirectional Zener configuration, 01005 (0402 Metric) surface mount package, operating temperature range (-40°C ~ 125°C), and ROHS3 compliance.

Q: Is the SP1044-01WTG still available for purchase?

A: The SP1044-01WTG is classified as Obsolete. Current inventory of 20,300 pieces is available through authorized distributors. For new designs or long-term production requirements, SP1020-01WTG (Active status) is the recommended alternative.

Q: What is the difference between flip chip and standard surface mount packaging?

A: Both SP1044-01WTG and SP1020-01WTG utilize flip chip technology within the 01005 (0402 Metric) package format. Flip chip configuration provides enhanced electrical performance and thermal characteristics in miniature packages. PCB design and assembly processes must accommodate flip chip solder ball attachment methods.