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Vishay General Semiconductor - Diodes Division VTVS31ASMF-HM3-18
- Part No.:
- VTVS31ASMF-HM3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
VTVS31ASMF-HM3-18.pdf
- Description:
- TVS DIODE 30.6VWM 51VC DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,727
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Product details
Overview
VTVS31ASMF-HM3-18 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 low-voltage DC lines such as USB, HDMI, and automotive sensor interfaces. It features 30.6 V stand-off voltage (VRWM), 34.2–37.8 V reverse breakdown voltage (VBR) at 1 mA, 51 A peak pulse current (IPPM), and clamps to ≤51 V at rated pulse, with ±5 % VBR tolerance.
For engineers reviewing the VTVS31ASMF-HM3-18 datasheet, VTVS31ASMF-HM3-18 pinout, VTVS31ASMF-HM3-18 application, or VTVS31ASMF-HM3-18 equivalent, this device is selected for high-reliability board-level ESD protection where low clamping voltage, IEC 61000-4-2 ±30 kV contact/air discharge compliance, and AEC-Q101 qualification are required.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its 34.2–37.8 V breakdown range. Its 51 V maximum clamping voltage (VC) at 7.51 A IPPM ensures robust protection of downstream 3.3 V–5 V logic without overstressing IC inputs.
Designed for surface-mount reflow and wave soldering, it leverages Vishay's "Low-Noise" fast-response technology with sub-nanosecond turn-on and 380 pF typical junction capacitance at 0 V, minimizing signal distortion on high-speed data lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W (10/1000 μs waveform); sustains repeated surge events without degradation in compact SMF package |
| Stand-off Voltage (VRWM) | 30.6 V; maximum continuous reverse voltage before significant leakage, compatible with 24 V industrial bus systems |
| Breakdown Voltage (VBR) | 34.2–37.8 V at IT = 1 mA; ±5 % tolerance ensures predictable triggering across production lots |
| Clamping Voltage (VC) | ≤51 V at IPPM = 7.51 A; limits transient voltage seen by protected IC to safe margin below absolute max ratings |
| Junction Capacitance (CD) | 380 pF at VR = 0 V, f = 1 MHz; low enough for USB 2.0 and CAN FD signal integrity, not suitable for >100 MHz interfaces |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2; meets Level 4 immunity for front-panel and connector interfaces |
| Operating Temperature | −55 °C to +175 °C; supports under-hood automotive and industrial environments without derating |
Pinout & Package
SMF (DO-219AB) low-profile surface-mount package: 3.9 mm × 1.9 mm × 1.08 mm, halogen-free molding compound, MSL level 1, compatible with SOD-123W footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to protected line; conducts during positive transients in unidirectional configuration |
| Cathode | Avalanche clamping node | Connected to ground or lower-potential rail; defines polarity and enables reverse-biased clamping action |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Enables single-device protection against IEC 61000-4-5 Level 3 surges (1 A, 2 Ω source) on 24 V lines |
| ±30 kV ESD immunity | Eliminates need for external ESD staging on exposed ports meeting automotive and industrial safety standards |
| Low-profile SMF package | Reduces PCB real estate vs. SMA/SMB; allows placement adjacent to connectors without height interference |
| AEC-Q101 qualified | Validated for automotive applications including body control modules and ADAS sensor interfaces |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and JESD201 whisker testing Class 2 for long-term reliability |
Applications
| Automotive Sensor Interface | Industrial PLC I/O Port |
|---|---|
|
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., temperature, pressure) in engine control units from load dump and ESD. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between sensor signal line and chassis ground. Use Value: Clamps transients to ≤51 V while maintaining <0.05 μA leakage at 30.6 V, preserving sensor accuracy and ADC reference stability. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controller modules against field wiring surges. IC Role / Device Role / Timing Role: Primary overvoltage protector on dry-contact or optocoupler input side. Use Value: Withstands 400 W pulses and −55 °C to +175 °C operation, enabling use in uncontrolled cabinet environments without thermal derating. |
| USB 2.0 Data Line Protection | DC Power Rail Clamp |
|
Use Scenario: ESD protection for USB D+/D− lines in embedded host devices (e.g., medical monitors, point-of-sale terminals). IC Role / Device Role / Timing Role: Low-capacitance TVS placed inline with differential pair, cathode grounded. Use Value: 380 pF capacitance avoids signal rise-time degradation; ±30 kV IEC 61000-4-2 rating covers user-handling events. |
Use Scenario: Secondary surge clamp on regulated 3.3 V or 5 V supply rails feeding microcontrollers and memory. IC Role / Device Role / Timing Role: Standby-mode protector activated only during overvoltage events above VRWM. Use Value: 30.6 V VRWM ensures no conduction during normal operation; 51 V VC prevents latch-up or burnout of downstream LDOs and SoCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/5A (Vishay) | Higher VRWM (33 V), larger SMA package (4.5 mm × 2.7 mm), same 400 W rating but 55 V VC | Less suitable for space-constrained layouts; higher clamping may stress 3.3 V ICs | Select VTVS31ASMF-HM3-18 for tighter board space and lower clamping on 24 V systems |
| TPSMD33A (Texas Instruments) | Same VRWM (33 V), 400 W rating, but 53 V VC and 430 pF capacitance; not AEC-Q101 qualified | Lacks automotive qualification; higher capacitance impacts high-speed signal integrity | Choose VTVS31ASMF-HM3-18 when AEC-Q101 compliance and lower CD are mandatory |
Compared with SMAJ33A-E3/5A and TPSMD33A, VTVS31ASMF-HM3-18 delivers superior board density via DO-219AB packaging, tighter clamping (51 V vs. ≥53 V), and verified automotive qualification-critical for ECU and ADAS designs requiring zero layout change across platforms.
Availability
VTVS31ASMF-HM3-18 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O protection, and USB 2.0 port hardening requiring stable component supply and full traceability.
Supply support for VTVS31ASMF-HM3-18 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 passive and protection components for automotive, industrial, and computing markets.
The VTVS eSMP® Series targets board-level transient suppression with optimized clamping, low capacitance, and AEC-Q101 validation-designed specifically for next-generation automotive ECUs and ruggedized industrial controllers.
FAQ
What is the maximum clamping voltage of the VTVS31ASMF-HM3-18 at its rated peak pulse current?
The VTVS31ASMF-HM3-18 has a maximum reverse clamping voltage (VC) of 51 V when subjected to its rated 7.51 A peak pulse current (IPPM) under a 10/1000 μs waveform. This value is guaranteed across temperature and ensures protected circuitry remains within safe operating limits during surge events. The VTVS31ASMF-HM3-18 achieves this clamping performance while maintaining low leakage and fast response.
Is the VTVS31ASMF-HM3-18 qualified for automotive applications?
Yes, the VTVS31ASMF-HM3-18 is AEC-Q101 qualified, confirming its reliability for automotive use cases including engine control units, body electronics, and ADAS sensor interfaces. This qualification covers stress tests for temperature cycling, humidity, mechanical shock, and ESD robustness. The VTVS31ASMF-HM3-18 meets these requirements in its SMF (DO-219AB) package with halogen-free construction.
What does the 'HM3' suffix indicate in VTVS31ASMF-HM3-18?
The 'HM3' suffix in VTVS31ASMF-HM3-18 denotes halogen-free (H), lead-free (M), and 3 k per 7″ reel packaging (3). It confirms compliance with RoHS Directive 2011/65/EU and JEDEC J-STD-020 MSL level 1 handling. The VTVS31ASMF-HM3-18 is supplied on 8 mm tape with cathode orientation marked per Vishay standard carrier tape specification.
Can the VTVS31ASMF-HM3-18 be used for bidirectional protection?
No, the VTVS31ASMF-HM3-18 is a unidirectional TVS diode, intended for protection of DC lines referenced to ground. Its cathode-anode polarity must be observed during placement. For bidirectional applications such as AC lines or differential buses, a separate bidirectional part like VTVS31BSMF-HM3-18 would be required. The VTVS31ASMF-HM3-18 does not provide symmetrical clamping in both polarities.
What is the thermal resistance junction-to-lead (RthJL) for the VTVS31ASMF-HM3-18?
The VTVS31ASMF-HM3-18 has a thermal resistance junction-to-lead (RthJL) of 20 K/W when mounted on an infinite heat sink. This parameter governs how efficiently heat generated during transient clamping dissipates through the leads into the PCB copper. The VTVS31ASMF-HM3-18 maintains stable operation up to +175 °C junction temperature, supported by this thermal design margin.
VTVS31ASMF-HM3-18 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):
- 30.6V
- Voltage - Breakdown (Min):
- 34.2V
- Voltage - Clamping (Max) @ Ipp:
- 51V
- Current - Peak Pulse (10/1000µs):
- 7.51A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 380pF @ 1MHz
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
VTVS31ASMF-HM3-18 FAQ
1.How can I place an order for VTVS31ASMF-HM3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for VTVS31ASMF-HM3-18 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 VTVS31ASMF-HM3-18 reliable?
The price and inventory of VTVS31ASMF-HM3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VTVS31ASMF-HM3-18 is usually 5 days.
3.What payment methods are accepted for VTVS31ASMF-HM3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VTVS31ASMF-HM3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VTVS31ASMF-HM3-18?
VTVS31ASMF-HM3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VTVS31ASMF-HM3-18 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 VTVS31ASMF-HM3-18?
For technical support, including VTVS31ASMF-HM3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VTVS31ASMF-HM3-18 requirements.
6.How does Aetrix verify that VTVS31ASMF-HM3-18 is sourced from the original manufacturer or authorized distributors?
All VTVS31ASMF-HM3-18 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 VTVS31ASMF-HM3-18 meets industry standards.
7.What is the process for return or replacement of VTVS31ASMF-HM3-18?
All VTVS31ASMF-HM3-18 units undergo pre-shipment inspection (PSI). If there is an issue with VTVS31ASMF-HM3-18, 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 VTVS31ASMF-HM3-18 part is unused and in its original packaging.
Return procedure for VTVS31ASMF-HM3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
VTVS31ASMF-HM3-18 Tags
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