UESD12ST5G Equivalent & Substitute Parts

Part Overview

The UESD12ST5G is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by onsemi, designed for general-purpose ESD and transient protection applications. This component features a 12V reverse standoff voltage with a 23.7V clamping voltage and is housed in a SOD-723 surface mount package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

UESD12ST5G

onsemiIn Stock: 6149UESD12ST5G Datasheet

Current PartRFQ

ESD9X12ST5G

onsemiIn Stock: 767718ESD9X12ST5G Datasheet

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B72590D0150A060

EPCOS - TDK ElectronicsIn Stock: 181083B72590D0150A060 Datasheet

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CPDER12V

Comchip TechnologyIn Stock: 10259CPDER12V Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the UESD12ST5G is determined by the following critical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff: 12V (Max)
• Voltage - Clamping (Max) @ Ipp: 23.7V or lower
• Type: Zener (unidirectional)
• Unidirectional Channels: 1
• Current - Peak Pulse (8/20µs): ≥ 5.4A
• Package compatibility: SOD-723 or equivalent surface mount package
• Mounting Type: Surface Mount

Substitute Parts Identified:

1. ESD9X12ST5G (onsemi) – Direct functional equivalent with enhanced current rating and active product status
2. CPDER12V (Comchip Technology) – Functionally compatible with reduced current rating and alternative package option
3. B72590D0150A060 (EPCOS - TDK Electronics) – Varistor-based alternative with different electrical characteristics and package form factor

Parameter Comparison

Engineering Selection Recommendations

ESD9X12ST5G (Primary Substitute)

The ESD9X12ST5G is the preferred direct substitute for the UESD12ST5G. Both components are manufactured by onsemi and share identical voltage specifications (12V reverse standoff, 23.7V clamping). The ESD9X12ST5G offers superior current handling (5.9A vs. 5.4A) and increased power dissipation (140W vs. 128W), providing enhanced margin for transient protection. The component is active in production with ROHS3 compliance certification. The primary design consideration is package transition from SOD-723 to SOD-923, which requires PCB layout modification but maintains equivalent electrical performance and thermal characteristics across the operating temperature range (-55°C to 150°C).

CPDER12V (Secondary Substitute)

The CPDER12V from Comchip Technology provides functional substitution with compatible voltage specifications (12V reverse standoff, 25V clamping). This component is active in production with ROHS3 compliance. The significant limitation is reduced peak pulse current (1A vs. 5.4A) and lower power dissipation (25W vs. 128W), restricting application to lower-energy transient environments. Package options include 0503 (1308 Metric) or SOD-723F form factors. Selection of this substitute requires verification that application transient energy levels do not exceed 25W peak pulse power.

B72590D0150A060 (Alternative Technology)

The B72590D0150A060 is a varistor-based alternative from EPCOS - TDK Electronics with fundamentally different operating characteristics. While voltage specifications are nominally compatible (15V maximum DC, 20V varistor voltage minimum), the varistor technology exhibits different clamping behavior compared to Zener TVS diodes. This component features higher surge current capability (10A) but operates within a reduced temperature range (-40°C to 85°C). Selection of this alternative requires comprehensive circuit simulation and validation due to technology differences. The 0402 (1005 Metric) package represents a significant size reduction from SOD-723.

Compliance and Availability

All three substitute parts maintain ROHS3 compliance and REACH unaffected status. ESD9X12ST5G and CPDER12V demonstrate the highest inventory availability (767,661 and 10,200 units respectively), supporting production continuity. Selection should prioritize ESD9X12ST5G for applications requiring full electrical equivalence and extended temperature operation.

Frequently Asked Questions (FAQ)

Q: Can ESD9X12ST5G directly replace UESD12ST5G without circuit modification?

A: ESD9X12ST5G provides electrical equivalence with identical voltage specifications and superior current/power ratings. The primary design change is package transition from SOD-723 to SOD-923, requiring PCB footprint modification. No circuit topology changes are necessary.

Q: What are the key differences between the three substitute options?

A: ESD9X12ST5G maintains full electrical equivalence with enhanced performance margins. CPDER12V reduces peak pulse current to 1A, limiting application to lower-energy transients. B72590D0150A060 uses varistor technology instead of Zener diodes, exhibiting different clamping characteristics and reduced operating temperature range.

Q: Is CPDER12V suitable for all applications currently using UESD12ST5G?

A: CPDER12V is suitable only for applications where peak pulse power does not exceed 25W. Applications requiring the full 128W power dissipation capability of UESD12ST5G must use ESD9X12ST5G or equivalent higher-power alternatives.

Q: What is the impact of package size differences on PCB design?

A: ESD9X12ST5G (SOD-923) is slightly larger than UESD12ST5G (SOD-723). CPDER12V offers 0503 or SOD-723F packages. B72590D0150A060 (0402) is significantly smaller. Package selection impacts PCB layout density and thermal management considerations.

Q: Are all substitute parts RoHS compliant?

A: ESD9X12ST5G, CPDER12V, and B72590D0150A060 are all ROHS3 compliant. UESD12ST5G RoHS status is not specified in available documentation.

Q: What is the operating temperature range for each substitute?

A: ESD9X12ST5G operates across -55°C to 150°C (junction temperature), matching UESD12ST5G specifications. CPDER12V operating temperature is not specified. B72590D0150A060 operates within -40°C to 85°C (ambient temperature), a narrower range than the original component.

Q: Why is UESD12ST5G classified as obsolete?

A: Obsolete status indicates the component is no longer in active production. ESD9X12ST5G represents onsemi's current-generation equivalent, offering improved specifications and extended product lifecycle support.