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Taiwan Semiconductor Corporation RMB4S
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- Part No.:
- RMB4S
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Bridge Rectifiers
- Package:
- TO-269AA, 4-BESOP
- Datasheet:
-
RMB4S.pdf
- Description:
- BRIDGE RECT 1P 400V 0.5A TO269AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,832
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Product details
Overview
RMB4S from Taiwan Semiconductor is a fast recovery quad bridge rectifier rated for 400 V repetitive peak reverse voltage (VRRM), 0.8 A forward current on aluminum substrate, and 30 A non-repetitive surge current (IFSM); it uses TO-269AA (MBS) packaging and serves as AC-to-DC conversion core in compact offline power supplies.
For engineers reviewing the RMB4S datasheet, RMB4S pinout, RMB4S application, or RMB4S equivalent, key selection criteria include its 150 ns reverse recovery time (trr), 1 V max forward voltage at 0.4 A, 5 µA max reverse leakage at 25°C, thermal resistance of 85°C/W, and AEC-Q101 qualification option (RMB4SH).
Technical Context
The RMB4S integrates four fast recovery diodes in a single monolithic bridge configuration, enabling full-wave rectification without external interconnects. Its 150 ns reverse recovery time supports operation in high-frequency switching mode power supplies up to several hundred kHz.
Thermal performance is defined by a junction-to-ambient thermal resistance of 85°C/W under standard JEDEC test conditions, with derating required above 25°C ambient-0.8 A rating applies only when mounted on aluminum substrate, while glass-epoxy mounting limits continuous current to 0.5 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400 V - maximum repetitive reverse voltage per diode; defines safe AC input voltage ceiling (e.g., ≤280 VRMS) |
| IF (aluminum) | 0.8 A - continuous forward current rating when thermally coupled to aluminum substrate; enables higher power density than PCB-mount alternatives |
| trr | 150 ns - measured at IF = 0.5 A, IR = 1.0 A, Irr = 0.25 A; reduces switching losses in SMPS operating >50 kHz |
| VF (max) | 1.0 V - forward voltage per diode at 0.4 A and 25°C; determines conduction loss and thermal load in rectifier stage |
| IFSM | 30 A - 8.3 ms half-sine surge rating; withstands inrush currents during cold-start of adapters and lighting drivers |
| RθJA | 85 °C/W - junction-to-ambient thermal resistance; requires heatsinking or metal-core PCB for sustained 0.8 A operation |
Pinout & Package
Package: TO-269AA (MBS), 4-terminal surface-mount molded plastic case with matte tin-plated leads; meets UL 94V-0, J-STD-002 solderability, and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AC1 | Input AC terminal 1 | One of two alternating-current input nodes; connected internally to anode of D1 and cathode of D2 |
| AC2 | Input AC terminal 2 | Second alternating-current input node; connected internally to cathode of D1 and anode of D2 |
| + | Positive DC output | Common cathode connection of D1 and D3; delivers rectified positive rail |
| – | Negative DC output | Common anode connection of D2 and D4; serves as return/ground reference for DC output |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified variant available | RMB4SH meets automotive-grade reliability requirements including temperature cycling, HTRB, and ESD testing |
| Fast recovery (trr ≤ 150 ns) | Enables efficient operation in high-frequency SMPS without excessive switching loss or EMI from slow turn-off |
| High surge capability (IFSM = 30 A) | Supports repeated cold-start events in LED drivers and wall adapters without degradation |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained applications |
Applications
| LED Lighting Drivers | USB Wall Adapters |
|---|---|
Use Scenario: Constant-current LED driver with offline flyback topology operating from universal AC input (90–265 VAC). IC Role / Device Role / Timing Role: Primary AC-to-DC bridge rectifier converting mains input to pulsating DC before transformer primary. Use Value: 150 ns trr minimizes switching noise coupling into feedback loop; 400 V VRRM provides margin over 265 VAC × √2 ≈ 375 V peak. | Use Scenario: Compact 5–12 W USB charging adapter with integrated PWM controller and QR flyback. IC Role / Device Role / Timing Role: Input-stage full-wave rectifier delivering DC bus to primary-side switch. Use Value: 30 A IFSM handles inrush into bulk capacitor; TO-269AA footprint allows automated placement and high-density layout. |
| Industrial Control Power Supplies | Smart Home AC/DC Modules |
Use Scenario: DIN-rail mounted 24 V DC power supply for PLC I/O modules, operating continuously at 50°C ambient. IC Role / Device Role / Timing Role: Mains interface rectifier feeding bulk capacitor and active PFC stage. Use Value: 85°C/W RθJA permits thermal design with aluminum substrate mounting; 0.8 A rating sustains >15 W output with margin. | Use Scenario: Embedded AC/DC module inside smart thermostat or Wi-Fi plug, requiring low profile and high reliability. IC Role / Device Role / Timing Role: Surface-mount bridge rectifier providing isolated DC input to secondary-side regulation IC. Use Value: UL Recognized File #E-326854 ensures safety compliance; moisture sensitivity level 1 eliminates bake requirement prior to reflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bridge rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| GBU4K (ON Semiconductor) | Same TO-269AA package, 400 V VRRM, but 1.1 V max VF at 0.4 A and 250 ns trr | Higher conduction and switching losses; less suitable for >100 kHz designs | Select GBU4K only if cost sensitivity outweighs efficiency and EMI targets |
| DF04S (Diodes Inc.) | TO-269AA, 400 V VRRM, 0.8 A rating, but 200 ns trr and no AEC-Q101 option | Lacks automotive qualification path; slightly slower recovery increases switching loss | Prefer DF04S for consumer-grade lighting where AEC-Q101 is not mandated |
Compared with GBU4K and DF04S, the RMB4S offers the lowest reverse recovery time (150 ns) among TO-269AA 400 V bridges and is the only one with an AEC-Q101-qualified variant (RMB4SH), making it optimal for high-efficiency and automotive-adjacent applications.
Availability
RMB4S is available at Aetrix Electronics and suitable for switching mode power supplies, LED lighting drivers, and USB wall adapters requiring stable component supply, consistent parametric performance, and long-term manufacturability.
Supply support for RMB4S includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving industrial, computing, and consumer markets since 1979.
The RMB4S belongs to TSC's RMBxS fast recovery bridge rectifier family, designed specifically for space-constrained, high-frequency AC/DC conversion in energy-efficient offline power systems.
FAQ
What is the maximum continuous forward current rating for RMB4S?
The RMB4S has a 0.8 A continuous forward current rating when mounted on an aluminum substrate, and 0.5 A when mounted on standard glass-epoxy PCB. This distinction is critical for thermal design-exceeding 0.5 A on FR-4 risks exceeding the 150°C maximum junction temperature. The RMB4S datasheet specifies both ratings explicitly in the Absolute Maximum Ratings table.
Does RMB4S have automotive qualification?
The base RMB4S is not AEC-Q101 qualified, but the RMB4SH variant is fully AEC-Q101 certified. RMB4SH undergoes additional stress testing including temperature cycling, high-temperature reverse bias, and ESD per JESD22-A114. For automotive body electronics or ADAS auxiliary power, specify RMB4SH-not RMB4S-to meet qualification requirements.
What is the reverse recovery time (trr) of RMB4S and how is it measured?
The RMB4S reverse recovery time is 150 ns maximum, measured under standardized conditions: IF = 0.5 A, IR = 1.0 A, reverse recovery current Irr = 0.25 A, and TJ = 25°C. This value is specified in the Electrical Specifications table and confirmed via the test circuit diagram in Figure 6 of the RMB4S datasheet.
Can RMB4S replace RMB2S or RMB6S in the same footprint?
Yes-RMB2S, RMB4S, and RMB6S share identical TO-269AA (MBS) packaging, pinout, and mechanical dimensions. They differ only in VRRM: 200 V, 400 V, and 600 V respectively. Substituting RMB4S for RMB2S provides higher voltage margin; substituting for RMB6S reduces voltage overhead but maintains compatibility in layout and assembly.
What is the thermal resistance (RθJA) of RMB4S and what does it imply for PCB layout?
The RMB4S has a junction-to-ambient thermal resistance of 85°C/W under standard JEDEC test conditions. This means that at 0.8 A continuous current, the junction will rise ~68°C above ambient-requiring either aluminum substrate mounting, copper pour with thermal vias, or forced airflow. Layout must allocate ≥100 mm² of 2 oz copper connected to the – terminal for effective heat spreading.
RMB4S Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- TO-269AA, 4-BESOP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Diode Type:
- Single Phase
- Technology:
- Standard
- Voltage - Peak Reverse (Max):
- 400 V
- Current - Average Rectified (Io):
- 500 mA
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 400 mA
- Current - Reverse Leakage @ Vr:
- 5 µA @ 400 V
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-269AA (MBS)
RMB4S FAQ
1.How can I place an order for RMB4S through Aetrix?
Please submit a Request for Quotation (RFQ) for RMB4S on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for RMB4S reliable?
The price and inventory of RMB4S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RMB4S is usually 5 days.
3.What payment methods are accepted for RMB4S?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RMB4S transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RMB4S?
RMB4S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RMB4S order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for RMB4S?
For technical support, including RMB4S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RMB4S requirements.
6.How does Aetrix verify that RMB4S is sourced from the original manufacturer or authorized distributors?
All RMB4S products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that RMB4S meets industry standards.
7.What is the process for return or replacement of RMB4S?
All RMB4S units undergo pre-shipment inspection (PSI). If there is an issue with RMB4S, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The RMB4S part is unused and in its original packaging.
Return procedure for RMB4S:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RMB4S Tags
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HDS10M-13
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CD-MBL106S
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MB10S-13
Diodes Incorporated
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CD-MBL206SL
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MB4S-TP
Micro Commercial Co
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MB6S-TP
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CD-MBL210S
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BAS3007ARPPE6327HTSA1
Infineon Technologies
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DF02M
Diodes Incorporated
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CD-MBL210SL
Bourns Inc.
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DF04M
Diodes Incorporated
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DF01M
Diodes Incorporated
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