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Taiwan Semiconductor Corporation BAV21W RHG
- Part No.:
- BAV21W RHG
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- SOD-123F
- Datasheet:
-
BAV21W RHG.pdf
- Description:
- DIODE GP 250V 200MA SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:3,451
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Product details
Overview
BAV21W RHG from Taiwan Semiconductor is a surface-mount high-voltage switching diode in SOD-123F package, rated for 200 V repetitive peak reverse voltage (VRRM), 410 mW power dissipation, and 250 mA mean forward current (IO), used in flyback snubbers, voltage clamping, and DC-DC converter freewheeling paths.
For engineers reviewing the BAV21W RHG datasheet, BAV21W RHG pinout, BAV21W RHG application, or BAV21W RHG equivalent, key selection criteria include reverse recovery time (trr = 50 ns), junction capacitance (CJ = 4 pF), forward voltage at 200 mA (VF = 1.7 V max), and RoHS-compliant halogen-free green compound packaging.
Technical Context
The BAV21W RHG is a silicon planar epitaxial switching diode optimized for fast transient response in high-frequency power supply circuits. Its 50 ns reverse recovery time and low 4 pF junction capacitance support operation up to several MHz in snubber and clamp functions.
Designed for surface-mount assembly with matte tin (Sn) over nickel (Ni) plating, it meets MIL-STD-202 Method 208 solderability and withstands 260°C/10s reflow. Polarity is marked by a cathode band on the SOD-123F case.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 200 V - maximum repetitive reverse blocking voltage before breakdown; enables use in 170 VAC rectifier-derived rails |
| trr | 50 ns - measured at IF = IR = 30 mA, RL = 100 Ω, Irr = 3 mA; ensures minimal switching loss in 100–500 kHz converters |
| CJ | 4 pF - junction capacitance at VR = 0 V, f = 1 MHz; limits high-frequency coupling in RF-coupled clamp networks |
| VF | 1.7 V max at IF = 200 mA - forward drop impacts conduction loss in freewheeling paths; lower than BAV19W/BAV20W variants |
| PD | 410 mW - power dissipation at TA = 25°C; derates linearly above 25°C per RθJA = 375°C/W |
| IFSM | 250 A - non-repetitive surge rating (1 μs pulse); supports brief inrush or fault-current handling in protection circuits |
Pinout & Package
SOD-123F flat-lead plastic package: 2.86 mm × 1.52 mm × 0.95 mm body, cathode band marking, matte tin-plated terminals, moisture sensitivity level 1, halogen-free green compound (suffix "G").
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node in clamp/freewheel path; requires thermal relief pad for 410 mW dissipation |
| Cathode | Forward current exit / reverse blocking terminal | Marked by band; ties to switched node (e.g., MOSFET drain) in snubber; must sustain 200 V transient spikes |
Key Features
| Feature | Design Value |
|---|---|
| High VRRM rating | 200 V - allows direct use across 170 VAC-derived DC rails without series stacking |
| Fast trr | 50 ns - reduces reverse recovery charge (Qrr) and associated switching losses in high-frequency SMPS |
| Low CJ | 4 pF - minimizes capacitive loading on high-speed switching nodes, preserving signal edge integrity |
| Halogen-free green compound | Suffix "G" confirms IEC 61249-2-21 compliant molding compound - required for EU industrial and telecom end-equipment |
| MIL-STD-202 solderability | Guaranteed matte Sn/Ni plating withstands 260°C/10s reflow - eliminates post-assembly solder joint reliability concerns |
Applications
| Switch-Mode Power Supply Snubber | DC-DC Converter Freewheel Diode |
|---|---|
Use Scenario: Placed across primary-side MOSFET in flyback or RCD snubber network to absorb turn-off voltage spikes. IC Role / Device Role / Timing Role: Fast-switching clamp diode absorbing inductive energy during MOSFET turn-off transitions. Use Value: 50 ns trr and 200 V VRRM limit peak drain voltage to safe levels while minimizing snubber loss. | Use Scenario: Used as secondary-side freewheel diode in isolated buck-derived topologies operating at 200–500 kHz. IC Role / Device Role / Timing Role: Unidirectional current path enabling inductor current continuity during high-side switch off-time. Use Value: 410 mW PD and 250 mA IO support continuous conduction mode at 12 V/500 mA output without thermal derating. |
| Voltage Clamp for Microcontroller I/O | ESD Protection Interface Stage |
Use Scenario: Connected between microcontroller GPIO and external sensor line to clamp transients exceeding 3.3 V or 5 V rail. IC Role / Device Role / Timing Role: Standby reverse-biased clamp activated only during overvoltage events >200 V. Use Value: 200 V VRRM prevents breakdown during ESD or lightning-induced surges while 4 pF CJ avoids signal distortion. | Use Scenario: Integrated into USB or UART interface PCB layout as first-stage transient suppressor before TVS array. IC Role / Device Role / Timing Role: Low-capacitance front-end limiter limiting fast-rising ESD pulses before reaching sensitive receiver inputs. Use Value: 4 pF CJ preserves signal bandwidth up to 100 MHz; 50 ns trr ensures clean pulse clipping without ringing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BAV20W RHG | VRRM = 150 V (vs. 200 V); otherwise identical trr, CJ, VF, and package | Not suitable for 200 V+ clamping; acceptable where input-derived rails stay ≤120 VDC | Select BAV20W RHG only when system max reverse stress is confirmed ≤150 V |
| 1N4148W | VRRM = 100 V; trr = 4 ns (faster); CJ = 4 pF; PD = 500 mW; same SOD-123 package | Better for <100 V logic-level clamping; insufficient for 170 VAC-derived rails | Choose 1N4148W for sub-100 V, ultra-fast (<10 ns) signal routing; not a drop-in replacement for BAV21W RHG |
Compared with BAV21W RHG, BAV20W RHG offers lower voltage margin but identical speed and footprint, while 1N4148W trades voltage rating for faster recovery-making BAV21W RHG the sole option for 200 V-rated, medium-speed, green-compound SMD switching needs.
Availability
BAV21W RHG is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, and automotive body-control modules requiring stable component supply and halogen-free compliance.
Supply support for BAV21W RHG 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 is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving industrial, computing, and consumer markets since 1979.
The BAV19W/BAV20W/BAV21W family targets cost-sensitive, high-volume SMD switching applications where voltage rating, speed, and green packaging must be balanced-designed specifically for power supply auxiliary circuits and interface protection.
FAQ
What is the maximum repetitive peak reverse voltage (VRRM) of the BAV21W RHG?
The BAV21W RHG has a VRRM rating of 200 V, verified per DS_S1501003 (Version E15). This allows reliable operation in circuits derived from 170 VAC mains or 150 VDC bus systems where transient spikes may reach near this threshold. Exceeding 200 V risks irreversible avalanche breakdown.
Is the BAV21W RHG RoHS compliant and halogen-free?
Yes, the BAV21W RHG is RoHS compliant and uses halogen-free green compound, confirmed by the "G" suffix in its order code and documented in DS_S1501003. The matte tin (Sn) lead finish over nickel (Ni) underplate meets J-STD-609 Class 1 requirements for both lead-free assembly and environmental compliance.
What is the reverse recovery time (trr) specification for the BAV21W RHG?
The BAV21W RHG has a typical reverse recovery time of 50 ns, measured under conditions IF = IR = 30 mA, RL = 100 Ω, and Irr = 3 mA (DS_S1501003). This value is critical for minimizing switching losses in 100–500 kHz power converters and distinguishes it from slower general-purpose diodes like 1N4007.
Does the BAV21W RHG have the same package and pinout as BAV20W RHG and BAV19W RHG?
Yes, the BAV21W RHG shares the SOD-123F package and identical anode/cathode pinout with BAV20W RHG and BAV19W RHG. All three use the same mechanical outline (2.86 mm × 1.52 mm), cathode band polarity marking, and terminal plating-enabling board-level substitution where voltage rating permits.
What is the junction-to-ambient thermal resistance (RθJA) of the BAV21W RHG?
The BAV21W RHG has an RθJA of 375°C/W, specified at natural convection on FR-4 PCB with standard SOD-123F pad layout (DS_S1501003). At 25°C ambient, this supports 410 mW dissipation; above 25°C, derating follows the curve in Figure 1, reaching zero dissipation at ~135°C ambient.
BAV21W RHG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- SOD-123F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 250 V
- Current - Average Rectified (Io):
- 200mA
- Voltage - Forward (Vf) (Max) @ If:
- 1.25 V @ 200 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 100 nA @ 200 V
- Capacitance @ Vr, F:
- 5pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
- Operating Temperature - Junction:
- -65°C ~ 150°C
BAV21W RHG FAQ
1.How can I place an order for BAV21W RHG through Aetrix?
Please submit a Request for Quotation (RFQ) for BAV21W RHG 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 BAV21W RHG reliable?
The price and inventory of BAV21W RHG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAV21W RHG is usually 5 days.
3.What payment methods are accepted for BAV21W RHG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAV21W RHG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAV21W RHG?
BAV21W RHG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAV21W RHG 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 BAV21W RHG?
For technical support, including BAV21W RHG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAV21W RHG requirements.
6.How does Aetrix verify that BAV21W RHG is sourced from the original manufacturer or authorized distributors?
All BAV21W RHG 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 BAV21W RHG meets industry standards.
7.What is the process for return or replacement of BAV21W RHG?
All BAV21W RHG units undergo pre-shipment inspection (PSI). If there is an issue with BAV21W RHG, 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 BAV21W RHG part is unused and in its original packaging.
Return procedure for BAV21W RHG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BAV21W RHG Tags
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