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Vishay General Semiconductor - Diodes Division VTVS25ASMF-HM3-08
- Part No.:
- VTVS25ASMF-HM3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
VTVS25ASMF-HM3-08.pdf
- Description:
- TVS DIODE 25.2VWM 42VC DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:84,480
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Product details
Overview
VTVS25ASMF-HM3-08 from Vishay Semiconductors is a unidirectional 400 W TransZorb® transient voltage suppressor diode in SMF (DO-219AB) package, designed for ESD and surge protection of 25.2 V DC power rails and signal lines. It features 28.5–31.5 V reverse breakdown voltage (VBR), 42 V maximum clamping voltage (VC) at 9.07 A peak pulse current, and ±30 kV IEC 61000-4-2 ESD immunity - deployed in automotive infotainment power inputs and industrial sensor interfaces.
For engineers reviewing the VTVS25ASMF-HM3-08 datasheet, VTVS25ASMF-HM3-08 pinout, VTVS25ASMF-HM3-08 application, or VTVS25ASMF-HM3-08 equivalent, key selection criteria include its 433 pF junction capacitance at 0 V, 175 °C max junction temperature, halogen-free SOD-123W-compatible SMF package, and AEC-Q101 qualification status for automotive-grade reliability.
Technical Context
This device operates as a unidirectional avalanche diode with low-noise fast-response clamping action, triggered when transient voltage exceeds its 25.2 V stand-off rating (VRWM). Its 10/1000 μs waveform-rated 400 W peak pulse power and 20 K/W thermal resistance enable robust surge handling without thermal runaway under repeated transients.
The SMF package supports wave and reflow soldering per J-STD-020 MSL level 1, with cathode-bar marking and footprint optimized for minimal PCB area (3.9 × 1.9 mm). Its 433 pF capacitance at 0 V and 0.05 μA leakage at VRWM balance ESD protection with signal integrity in medium-speed data lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 25.2 V - Maximum continuous reverse working voltage before clamping begins; sets operating margin for 24 V nominal systems. |
| VBR (min/max) | 28.5 V / 31.5 V at IT = 1 mA - Tight ±5 % tolerance ensures predictable turn-on across temperature and production lots. |
| VC @ IPPM | 42 V at 9.07 A - Clamping voltage limits downstream IC stress during 10/1000 μs surges; enables safe operation of 3.3 V–24 V logic interfaces. |
| CD | 433 pF at VR = 0 V, f = 1 MHz - Capacitance impacts high-frequency signal integrity; suitable for USB 2.0, CAN, and RS-485 lines. |
| PPPM | 400 W - Peak pulse power rating defines energy-handling capability for IEC 61000-4-5 Level 3 (1 kV) surges on 50 Ω source impedance. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - Meets highest system-level ESD immunity requirements for exposed connectors and buttons. |
| TJ max | +175 °C - Enables use in under-hood automotive environments and high-ambient industrial enclosures without derating. |
Pinout & Package
SMF (DO-219AB) package: low-profile surface-mount outline compatible with SOD-123W, SOD-123F, and SOD-123FL footprints; dimensions 3.9 mm × 1.9 mm × 1.08 mm; cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or lowest potential rail; forms return path for clamped surge current. |
| Cathode | Protected line input | Connected to the line being protected (e.g., 24 V supply or CAN_H); avalanche conduction occurs from cathode to anode during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 3 surge immunity without external series impedance in many 24 V applications. |
| ±5 % VBR tolerance | Ensures consistent clamping threshold across production batches and temperature range (−55 °C to +175 °C). |
| Halogen-free, RoHS-compliant molding compound | Meets automotive and industrial environmental compliance mandates (JESD201 Class 2 whisker testing, UL 94 V-0 flammability). |
| AEC-Q101 qualified | Validated for automotive electronics use including powertrain, body control, and ADAS subsystems per stress test requirements. |
| MSL level 1 reflow compatibility | Allows single-pass lead-free reflow up to 260 °C without baking or special handling; simplifies high-volume manufacturing. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: 24 V battery-fed infotainment head unit power input subjected to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between VIN and GND, clamping transients before they reach DC/DC converter input. Use Value: Limits voltage to ≤42 V during 9.07 A surges, preventing damage to 40 V-rated input MOSFETs and enabling compliance with ISO 16750-2. |
Use Scenario: RS-485 bus lines in factory automation PLC modules exposed to ESD from operator interaction and field wiring noise. IC Role / Device Role / Timing Role: Bidirectional protection not required; unidirectional VTVS25ASMF-HM3-08 guards VCC-supplied bias lines feeding isolated transceivers. Use Value: 433 pF capacitance avoids signal edge degradation at 10 Mbps, while ±30 kV ESD rating protects against human-body-model events at connector ports. |
| Medical Equipment Power Rail Clamp | Smart Building Controller 24 V Auxiliary Supply |
Use Scenario: 24 V auxiliary supply for portable ultrasound imaging modules where EMI-sensitive analog front-ends require clean power. IC Role / Device Role / Timing Role: Standoff-clamp TVS placed immediately after input filter capacitor to suppress fast transients from shared AC/DC adapter rails. Use Value: 0.05 μA leakage at 25.2 V minimizes standby current drain; 175 °C TJ max supports sealed enclosure thermal design. |
Use Scenario: 24 V DC input to HVAC controller mounted in attic spaces where ambient temperatures exceed 85 °C. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power entry, coordinated with upstream fuse and downstream LDO. Use Value: AEC-Q101 qualification provides proven reliability under thermal cycling and humidity exposure, reducing field failure risk in long-lifecycle deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A-E3/57T | Higher VC = 38.9 V at 9.3 A; same 400 W rating but wider VBR tolerance (±10 %); SMA package (larger than SMF). | Less precise clamping threshold; requires larger PCB area; not AEC-Q101 qualified. | Select when cost sensitivity outweighs automotive qualification and space constraints. |
| TPSMD24A | Lower VRWM = 24 V; VC = 38.9 V at 9.3 A; same DO-219AB package; AEC-Q101 qualified. | Better match for strict 24 V nominal systems; tighter VRWM margin but reduced headroom for supply variation. | Prefer for designs requiring exact 24 V standoff with identical footprint and qualification. |
Compared with SMAJ24A-E3/57T and TPSMD24A, VTVS25ASMF-HM3-08 offers superior VBR precision (±5 % vs. ±10 % or ±5 % with lower VRWM), verified AEC-Q101 compliance, and optimized 433 pF capacitance for mixed-signal interface protection - making it ideal for next-generation automotive and industrial controllers demanding both accuracy and compactness.
Availability
VTVS25ASMF-HM3-08 is available at Aetrix Electronics and suitable for automotive infotainment power inputs, industrial RS-485 signal conditioning, and medical equipment 24 V auxiliary supplies requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for VTVS25ASMF-HM3-08 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
Vishay Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The VTVS eSMP® Series delivers standardized, AEC-Q101-qualified TVS diodes in ultra-compact SMF packages for space-constrained ESD and surge protection in automotive ECUs and industrial control units.
FAQ
What is the maximum clamping voltage of the VTVS25ASMF-HM3-08 under a 10/1000 μs surge?
The VTVS25ASMF-HM3-08 has a maximum reverse clamping voltage (VC) of 42 V at 9.07 A peak pulse current under the standard 10/1000 μs waveform. This value is measured per IEC 61000-4-5 and defines the upper voltage limit imposed on protected circuits during surge events - critical for ensuring downstream ICs rated to 40 V or higher remain within safe operating limits. The VTVS25ASMF-HM3-08 maintains this clamping performance across its full operating temperature range.
Is the VTVS25ASMF-HM3-08 qualified for automotive applications?
Yes, the VTVS25ASMF-HM3-08 is AEC-Q101 qualified, meaning it has passed rigorous stress tests including high-temperature operating life, temperature cycling, and ESD robustness specifically defined for discrete semiconductor components used in automotive electronics. This qualification confirms its suitability for under-hood and cabin applications such as body control modules, infotainment systems, and ADAS sensors - where reliability under thermal and mechanical stress is mandatory. The VTVS25ASMF-HM3-08 meets these requirements in its SMF (DO-219AB) package.
What is the junction capacitance of the VTVS25ASMF-HM3-08, and how does it affect circuit design?
The VTVS25ASMF-HM3-08 exhibits a typical junction capacitance (CD) of 433 pF at 0 V reverse bias and 1 MHz frequency. This value directly impacts high-speed signal integrity: in data lines like RS-485 or CAN, it introduces capacitive loading that may attenuate edges or reduce bandwidth if not accounted for in layout and termination. However, at 433 pF, it remains compatible with 10 Mbps RS-485 and low-speed CAN FD implementations. Designers should verify timing margins using IBIS models or SPICE simulations when integrating the VTVS25ASMF-HM3-08 into signal paths.
Does the VTVS25ASMF-HM3-08 meet IEC 61000-4-2 ESD immunity standards?
Yes, the VTVS25ASMF-HM3-08 is rated for ±30 kV contact discharge and ±30 kV air discharge per IEC 61000-4-2 - the highest level defined in the standard. This performance is achieved through its "low-noise" fast-response avalanche structure and optimized chip geometry. In practice, this allows the VTVS25ASMF-HM3-08 to protect sensitive microcontrollers, transceivers, and sensors on exposed ports (e.g., USB, HDMI, or button interfaces) without requiring additional external filtering, provided layout follows recommended trace length and grounding practices per Vishay's application notes.
What is the thermal resistance and maximum junction temperature of the VTVS25ASMF-HM3-08?
The VTVS25ASMF-HM3-08 has a thermal resistance (RthJL) of 20 K/W when mounted on an infinite heat sink, and a maximum junction temperature (TJ) of +175 °C. These specifications define its ability to dissipate surge energy without thermal failure: for example, during a 400 W 10/1000 μs pulse, peak junction temperature rise is limited to ~800 K·W × 20 K/W = 16 K above ambient - well within safe limits. The +175 °C rating enables reliable operation in high-ambient environments such as engine compartments or sealed industrial enclosures where ambient temperatures exceed 105 °C.
VTVS25ASMF-HM3-08 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-219AB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 25.2V
- Voltage - Breakdown (Min):
- 28.5V
- Voltage - Clamping (Max) @ Ipp:
- 42V
- Current - Peak Pulse (10/1000µs):
- 9.07A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 433pF @ 1MHz
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
VTVS25ASMF-HM3-08 FAQ
1.How can I place an order for VTVS25ASMF-HM3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for VTVS25ASMF-HM3-08 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 VTVS25ASMF-HM3-08 reliable?
The price and inventory of VTVS25ASMF-HM3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VTVS25ASMF-HM3-08 is usually 5 days.
3.What payment methods are accepted for VTVS25ASMF-HM3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VTVS25ASMF-HM3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VTVS25ASMF-HM3-08?
VTVS25ASMF-HM3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VTVS25ASMF-HM3-08 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 VTVS25ASMF-HM3-08?
For technical support, including VTVS25ASMF-HM3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VTVS25ASMF-HM3-08 requirements.
6.How does Aetrix verify that VTVS25ASMF-HM3-08 is sourced from the original manufacturer or authorized distributors?
All VTVS25ASMF-HM3-08 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 VTVS25ASMF-HM3-08 meets industry standards.
7.What is the process for return or replacement of VTVS25ASMF-HM3-08?
All VTVS25ASMF-HM3-08 units undergo pre-shipment inspection (PSI). If there is an issue with VTVS25ASMF-HM3-08, 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 VTVS25ASMF-HM3-08 part is unused and in its original packaging.
Return procedure for VTVS25ASMF-HM3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
VTVS25ASMF-HM3-08 Tags
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