FFB20UP20STM Equivalent & Substitute Parts Reference

Part Overview

The FFB20UP20STM is a general-purpose rectifier diode manufactured by onsemi, rated for 200 V DC reverse voltage and 20 A average rectified current in a Surface Mount TO-263 (D2PAK) package. This part is classified as Obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement continuity. The FFB20UP20STM features fast recovery characteristics with a reverse recovery time of 45 ns, making it suitable for switching applications requiring rapid diode turn-off performance.

Substiute Parts

FFB20UP20STM

onsemiIn Stock: 28634FFB20UP20STM Datasheet

Current PartRFQ

MURB1620CTRT4G

onsemiIn Stock: 6258MURB1620CTRT4G Datasheet

MFR RecommendedRFQ

MURB1620CTT4G

onsemiIn Stock: 17202MURB1620CTT4G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FFB20UP20STM is constrained by the following critical parameters:

Voltage Rating: All substitute parts must maintain a minimum DC reverse voltage rating of 200 V to ensure equivalent reverse bias protection.

Current Rating: The FFB20UP20STM is rated for 20 A average rectified current. Substitute parts with lower per-diode current ratings (such as 8 A) are classified as functional alternatives only when circuit topology permits parallel operation or when application requirements allow reduced current capacity.

Package Compatibility: The FFB20UP20STM uses a TO-263 (D2PAK) Surface Mount package. Substitute parts must use identical or mechanically compatible packaging to ensure PCB layout compatibility without redesign.

Speed Classification: Fast recovery characteristics (trr ≤ 500 ns) are maintained across substitute selections to preserve switching performance in high-frequency applications.

Diode Configuration: The FFB20UP20STM is a single diode. Substitute parts may include diode arrays with specific internal configurations (Common Anode or Common Cathode), which affect circuit connectivity and must be evaluated against application requirements.

The identified substitute parts are:

MURB1620CTRT4G — Diode array, 1 Pair Common Anode configuration, 8 A per diode, 200 V rating, TO-263 package, Active status.

MURB1620CTT4G — Diode array, 1 Pair Common Cathode configuration, 8 A per diode, 200 V rating, TO-263 package, Active status.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The FFB20UP20STM is classified as Obsolete. Both MURB1620CTRT4G and MURB1620CTT4G are Active products with ongoing manufacturer support, inventory availability, and process continuity. Selection of an Active substitute part ensures long-term supply chain reliability and compliance with current manufacturing standards.

Compliance and Certification: All three parts maintain ROHS3 compliance, REACH Unaffected status, and MSL 1 (Unlimited) moisture sensitivity rating. No compliance barriers exist for substitution.

Current Rating Trade-off: The FFB20UP20STM delivers 20 A in a single diode package. The substitute parts (MURB1620CTRT4G and MURB1620CTT4G) are diode arrays with 8 A per diode rating. Applications requiring the full 20 A capacity must evaluate circuit topology to determine if parallel diode operation is feasible or if reduced current capacity is acceptable.

Reverse Recovery Time: MURB1620CTT4G exhibits superior reverse recovery performance (35 ns) compared to FFB20UP20STM (45 ns), providing faster switching characteristics. MURB1620CTRT4G has a longer trr (85 ns), which may impact high-frequency switching efficiency.

Forward Voltage: MURB1620CTT4G demonstrates lower forward voltage drop (0.975 V @ 8 A) compared to FFB20UP20STM (1.15 V @ 20 A), reducing conduction losses in applications with lower current requirements.

Diode Configuration: Selection between MURB1620CTRT4G (Common Anode) and MURB1620CTT4G (Common Cathode) depends on circuit topology and connection requirements. Common Anode configuration shares a common positive terminal; Common Cathode configuration shares a common negative terminal.

Temperature Range: Both substitute parts support -65 to 175 °C junction temperature range, exceeding the FFB20UP20STM specification (-65 to 150 °C), providing enhanced thermal margin.

Frequently Asked Questions (FAQ)

Q: Can MURB1620CTRT4G or MURB1620CTT4G directly replace FFB20UP20STM in a 1:1 footprint substitution?

A: Yes, both substitute parts use identical TO-263 (D2PAK) Surface Mount packaging, ensuring mechanical and PCB layout compatibility without redesign. However, the diode array configuration requires circuit topology evaluation to confirm functional equivalence.

Q: What is the difference between MURB1620CTRT4G (Common Anode) and MURB1620CTT4G (Common Cathode)?

A: MURB1620CTRT4G contains two diodes sharing a common anode (positive) terminal. MURB1620CTT4G contains two diodes sharing a common cathode (negative) terminal. Selection depends on circuit connection requirements and how the diodes are biased in the application.

Q: The FFB20UP20STM is rated for 20 A, but the substitute parts are rated for 8 A per diode. Can I use them in a 20 A application?

A: Direct 1:1 substitution is not possible if the application requires continuous 20 A operation from a single diode. However, if circuit topology permits parallel connection of both diodes within the array, combined current capacity reaches 16 A, which may be insufficient. Alternative single-diode substitutes with higher current ratings should be evaluated for applications requiring full 20 A capacity.

Q: Are there any compliance or regulatory differences between FFB20UP20STM and the substitute parts?

A: No. All three parts maintain ROHS3 compliance, REACH Unaffected status, and identical MSL 1 (Unlimited) moisture sensitivity ratings. No compliance barriers exist for substitution.

Q: Why is FFB20UP20STM classified as Obsolete?

A: Obsolete status indicates the manufacturer has discontinued active production and support. MURB1620CTRT4G and MURB1620CTT4G are Active products with ongoing availability, ensuring supply chain continuity and access to current manufacturing processes.

Q: How do the reverse recovery times compare, and does this affect circuit performance?

A: FFB20UP20STM has trr of 45 ns. MURB1620CTT4G has 35 ns (faster), and MURB1620CTRT4G has 85 ns (slower). Faster recovery reduces switching losses and improves efficiency in high-frequency applications. MURB1620CTT4G provides superior switching performance; MURB1620CTRT4G may increase switching losses in fast-switching circuits.

Q: What is the reverse leakage current difference, and is it significant?

A: FFB20UP20STM has reverse leakage of 100 µA @ 200 V. Both substitute parts have 5 µA @ 200 V, representing a 20-fold reduction. Lower leakage current reduces standby power consumption and improves circuit efficiency in low-current or standby operating modes.

Q: Can I use MURB1620CTRT4G and MURB1620CTT4G interchangeably?

A: No. The internal diode configuration (Common Anode vs. Common Cathode) determines terminal connectivity and circuit behavior. Selection must match the application's circuit topology and connection requirements. Incorrect configuration selection will result in circuit malfunction.

Q: What is the operating temperature range difference?

A: FFB20UP20STM operates from -65 to 150 °C. Both substitute parts operate from -65 to 175 °C, providing an additional 25 °C thermal margin. This extended range improves reliability in high-temperature environments.