UESD3.3ST5G Equivalent & Substitute Parts

Part Overview

The UESD3.3ST5G is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by onsemi, designed for general-purpose ESD and transient protection applications. This component features a 3.3V reverse standoff voltage with a 10.9V maximum clamping voltage and 10.4A peak pulse current capability in an SOD-723 surface mount package. The product is currently classified as obsolete, making identification of suitable equivalent and substitute parts essential for ongoing design support and component procurement.

Substiute Parts

UESD3.3ST5G

onsemiIn Stock: 38041UESD3.3ST5G Datasheet

Current PartRFQ

ESD9X3.3ST5G

onsemiIn Stock: 165158ESD9X3.3ST5G Datasheet

DirectRFQ

B72590D0050A060

EPCOS - TDK ElectronicsIn Stock: 25689B72590D0050A060 Datasheet

SimilarRFQ

SP1003-01DTG

Littelfuse Inc.In Stock: 61181SP1003-01DTG Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the UESD3.3ST5G is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Reverse standoff voltage: 3.3V (Max)
• Breakdown voltage minimum: 5V
• Clamping voltage: within acceptable range for circuit protection
• Peak pulse current capability: minimum 9.8A (8/20µs)
• Unidirectional channel configuration: 1 channel
• Package compatibility: SOD-723 or equivalent surface mount form factor
• Operating temperature range: minimum -55°C to 150°C

Substitute Part Categories:

Direct Equivalent (ESD9X3.3ST5G): Active product from onsemi with identical voltage specifications, SOD-923 package (smaller footprint alternative), and comparable electrical performance. Suitable for direct replacement with PCB layout adjustment.

Similar Substitute (B72590D0050A060): EPCOS varistor technology with different package form (0402 MLCV) and slightly higher varistor voltage (6.4V). Acceptable for applications with relaxed voltage tolerance requirements.

Similar Substitute (SP1003-01DTG): Littelfuse TVS diode with higher reverse standoff voltage (5V) and clamping voltage (12V Typ), SOD-723 package match. Suitable for circuits requiring higher voltage protection thresholds.

Parameter Comparison

Engineering Selection Recommendations

ESD9X3.3ST5G (Recommended Direct Equivalent): This onsemi part maintains identical voltage specifications (3.3V reverse standoff, 5V breakdown minimum) and operating temperature range (-55°C to 150°C). The product is active with ROHS3 compliance. The SOD-923 package is a smaller footprint alternative to SOD-723, requiring PCB layout modification but offering superior space efficiency. Peak pulse current (9.8A) and power dissipation (102W) are within acceptable margins of the original specification.

SP1003-01DTG (Package-Compatible Alternative): This Littelfuse TVS diode maintains SOD-723 package compatibility with the original part, eliminating layout redesign requirements. However, the higher reverse standoff voltage (5V) and clamping voltage (12V Typ) make this suitable only for circuits with relaxed voltage protection thresholds. Peak pulse current is reduced to 7A, limiting applicability to lower-current transient scenarios. Product is active with ROHS3 compliance and -40°C to 125°C operating range.

B72590D0050A060 (Technology Alternative): This EPCOS varistor represents a different protection technology with higher varistor voltage (6.4V) and reduced operating temperature range (-40°C to 85°C). Selection requires verification that circuit voltage thresholds accommodate the higher protection level. This option is suitable only for applications not requiring the full -55°C lower temperature specification.

Frequently Asked Questions (FAQ)

Q: Can ESD9X3.3ST5G directly replace UESD3.3ST5G without circuit modification?

A: Electrical specifications are compatible. The SOD-923 package is physically smaller than SOD-723, requiring PCB footprint adjustment. Verify pad spacing and trace routing accommodate the smaller package dimensions before implementation.

Q: What is the primary difference between the direct equivalent and similar substitutes?

A: ESD9X3.3ST5G maintains identical voltage specifications and operating temperature range as the original part. SP1003-01DTG and B72590D0050A060 have higher voltage thresholds, making them suitable only for circuits with higher transient voltage tolerance. Selection depends on circuit protection requirements.

Q: Is the B72590D0050A060 varistor suitable for all applications requiring UESD3.3ST5G?

A: No. The varistor technology and higher voltage rating (6.4V) differ from the original TVS diode specification. Additionally, the reduced operating temperature range (-40°C to 85°C) excludes applications requiring -55°C lower temperature operation. Use only when circuit design accommodates these parameter differences.

Q: What compliance certifications apply to substitute parts?

A: ESD9X3.3ST5G, SP1003-01DTG, and B72590D0050A060 are all ROHS3 compliant and REACH unaffected. All parts carry MSL 1 (Unlimited) moisture sensitivity rating. Verify specific compliance requirements for your application before final selection.

Q: How do capacitance differences affect circuit performance?

A: UESD3.3ST5G and ESD9X3.3ST5G both specify 80pF @ 1MHz. B72590D0050A060 specifies 180pF @ 1kHz, which may impact high-frequency circuit behavior. SP1003-01DTG does not specify capacitance. For high-frequency applications, ESD9X3.3ST5G is the preferred substitute.

Q: Can multiple substitute parts be used interchangeably in the same design?

A: No. Each substitute has distinct electrical characteristics. Once a substitute is selected and validated for a specific circuit, maintain that part number throughout production. Changing between substitutes requires circuit re-evaluation and testing.