NUP4201DR2 Equivalent & Substitute Parts

Part Overview

The NUP4201DR2 is a steering transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose power line protection applications. This component features a 5V reverse standoff voltage, 25V clamping voltage, and 25A peak pulse current capability in an 8-SOIC surface mount package. The part is currently listed as obsolete, making identification of suitable alternatives essential for ongoing design support and production continuity.

Substiute Parts

NUP4201DR2

onsemiIn Stock: 1142NUP4201DR2 Datasheet

Current PartRFQ

NUP4201DR2G

onsemiIn Stock: 5508NUP4201DR2G Datasheet

DirectRFQ

LM317MDT-TR

STMicroelectronicsIn Stock: 150266LM317MDT-TR Datasheet

SimilarRFQ

SRDA3.3-4BTG

Littelfuse Inc.In Stock: 3496SRDA3.3-4BTG Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the NUP4201DR2 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Category: Transient Voltage Suppressors (TVS)
• Type: Steering (Rail to Rail)
• Unidirectional Channels: 4
• Voltage - Reverse Standoff (Typ): 5V
• Voltage - Clamping (Max) @ Ipp: 25V
• Current - Peak Pulse (8/20µs): 25A
• Package / Case: 8-SOIC surface mount

Direct Equivalent: NUP4201DR2G meets all electrical specifications and maintains identical package configuration. This part represents a direct replacement with active product status and improved compliance.

Similar Alternative: SRDA3.3-4BTG provides comparable steering TVS diode functionality in the same 8-SOIC package but operates at a lower voltage rating (3.3V reverse standoff, 17.7V clamping). This part is suitable only when circuit voltage requirements permit operation at reduced voltage thresholds.

Non-Equivalent Part: LM317MDT-TR is categorized as Power Management (PMIC) and functions as a linear voltage regulator, not a transient voltage suppressor. This part does not meet the functional or electrical requirements for TVS diode substitution.

Parameter Comparison

Engineering Selection Recommendations

NUP4201DR2G (Direct Equivalent - Recommended)

NUP4201DR2G is the primary substitute for the obsolete NUP4201DR2. Both parts are manufactured by onsemi and share identical electrical specifications: 5V reverse standoff voltage, 25V clamping voltage, 25A peak pulse current, and 8-SOIC package configuration. NUP4201DR2G maintains active product status and achieves ROHS3 compliance, addressing regulatory requirements that the original part does not meet. This part is suitable for direct board-level replacement without circuit modification.

SRDA3.3-4BTG (Similar Alternative - Conditional Use)

SRDA3.3-4BTG by Littelfuse Inc. operates at reduced voltage ratings (3.3V reverse standoff, 17.7V clamping) compared to the NUP4201DR2. While this part maintains the same 8-SOIC package and steering TVS diode architecture, it is suitable only for applications where circuit voltage requirements are compatible with 3.3V operation. The part offers higher peak pulse current (30A) and power dissipation (600W) but operates within a narrower temperature range (-40°C ~ 125°C). ROHS3 compliance is achieved.

LM317MDT-TR (Not Recommended)

LM317MDT-TR is a linear voltage regulator and does not function as a transient voltage suppressor. This part is not suitable for substitution in applications requiring TVS diode protection.

Frequently Asked Questions (FAQ)

Q: Can NUP4201DR2G be used as a direct replacement for NUP4201DR2?

A: Yes. NUP4201DR2G is manufactured by onsemi and provides identical electrical performance: 5V reverse standoff voltage, 25V clamping voltage, 25A peak pulse current, and 8-SOIC package. The part is pin-compatible and requires no circuit modifications. NUP4201DR2G is active and ROHS3 compliant.

Q: What are the voltage limitations of SRDA3.3-4BTG as a substitute?

A: SRDA3.3-4BTG operates at 3.3V reverse standoff and 17.7V clamping voltage, compared to the NUP4201DR2 specifications of 5V and 25V respectively. This part is suitable only for circuits designed to operate at 3.3V protection levels. Use in 5V circuits will result in premature clamping and potential circuit malfunction.

Q: Are all substitute parts available in the same 8-SOIC package?

A: Yes. NUP4201DR2G and SRDA3.3-4BTG are both available in 8-SOIC (0.154", 3.90mm Width) surface mount packages, maintaining identical footprint compatibility with the original NUP4201DR2.

Q: Why is LM317MDT-TR listed as a similar part if it cannot substitute?

A: LM317MDT-TR is categorized as a similar part based on packaging and surface mount configuration but functions as a linear voltage regulator, not a transient voltage suppressor. This part does not meet the functional requirements for TVS diode applications and is not suitable for substitution.

Q: What compliance advantages does NUP4201DR2G offer over the original part?

A: NUP4201DR2G achieves ROHS3 compliance, whereas the original NUP4201DR2 is non-compliant. For applications subject to RoHS regulations, NUP4201DR2G is the required choice. Both parts maintain identical electrical specifications and package configuration.

Q: What is the operating temperature range difference between substitute parts?

A: NUP4201DR2 and NUP4201DR2G operate across -55°C ~ 150°C (TJ), while SRDA3.3-4BTG operates across -40°C ~ 125°C (TJ). For applications requiring operation below -40°C or above 125°C, NUP4201DR2G is the appropriate choice.