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Vishay General Semiconductor - Diodes Division VTVS40ASMF-HM3-18
- Part No.:
- VTVS40ASMF-HM3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
VTVS40ASMF-HM3-18.pdf
- Description:
- TVS DIODE 39.6VWM 67VC DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,468
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Product details
Overview
VTVS40ASMF-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. It features a 39.6 V stand-off voltage (VRWM), 44.7–49.4 V reverse breakdown (VBR at 1 mA), 67 A peak pulse current (10/1000 μs), 67 V clamping voltage (VC), and 309 pF capacitance at 0 V - ideal for protecting USB, HDMI, and automotive sensor interfaces.
For engineers reviewing the VTVS40ASMF-HM3-18 datasheet, VTVS40ASMF-HM3-18 pinout, VTVS40ASMF-HM3-18 application, or VTVS40ASMF-HM3-18 equivalent, this part delivers precise ±5 % VBR tolerance, IEC 61000-4-2 ±30 kV contact/air ESD immunity, AEC-Q101 qualification, halogen-free construction, and compatibility with SOD-123W footprint - critical for automotive infotainment and ADAS power rail hardening.
Technical Context
This unidirectional TVS diode operates as a clamping device that remains non-conductive below VRWM = 39.6 V and avalanches sharply above VBR (min 44.7 V) to limit transient overvoltages. Its low 20 K/W thermal resistance (RthJL) enables reliable power dissipation during 400 W 10/1000 μs surges without thermal runaway.
The device uses "Low-Noise" silicon technology for sub-nanosecond response time and exhibits stable clamping performance across -55 °C to +175 °C junction temperature range. Its 309 pF capacitance at 0 V supports signal integrity in high-speed data lines up to ~100 MHz while maintaining robust ESD suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W (10/1000 μs waveform - sustains automotive load-dump and ISO 7637-2 transients) |
| Stand-off Voltage (VRWM) | 39.6 V (maximum continuous reverse working voltage before leakage exceeds 0.05 μA) |
| Breakdown Voltage (VBR) | 44.7–49.4 V at IT = 1 mA (±5 % tolerance ensures predictable turn-on threshold) |
| Clamping Voltage (VC) | 67 V at IPPM = 67 A (limits downstream IC voltage stress during surge events) |
| Capacitance (CD) | 309 pF at VR = 0 V, f = 1 MHz (low enough for USB 2.0 and CAN FD signal integrity) |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 (meets automotive interior ESD requirements) |
| Junction Temp Range | -55 °C to +175 °C (supports under-hood and powertrain applications) |
Pinout & Package
SMF (DO-219AB) low-profile surface-mount package: 3.9 mm × 1.9 mm × 1.08 mm body, cathode marked by bar, compatible with SOD-123W footprint and reflow/wave soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to protected line ground or low-side reference; completes clamping loop during avalanche |
| Cathode | Protected line connection | Connected to the signal/power line being safeguarded; conducts when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Handles ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 Level 3 surges without failure |
| ±5 % VBR tolerance | Ensures tight clamping window between VRWM and VC - reduces risk of false triggering or insufficient protection |
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTGB, HTRB, and TCT |
| Halogen-free & RoHS-compliant | Meets automotive OEM material compliance mandates (e.g., GMW3172, Ford WSS-M99P9999-A1) |
| Low-profile SMF package | Enables placement near connectors on space-constrained PCBs without height interference |
Applications
| Automotive Sensor Interface | USB 2.0 Data Line Protection |
|---|---|
Use Scenario: Protecting LIN bus sensors and analog front-end inputs in engine control modules exposed to battery transients and ESD. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between sensor signal line and chassis ground. Use Value: Clamps ISO 7637-2 Pulse 1 (inductive switch-off) to ≤67 V, preserving ADC input integrity and preventing latch-up in microcontrollers. |
Use Scenario: Safeguarding USB 2.0 D+/D− lines in infotainment head units against hot-plug ESD and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (cathode to D+, anode to GND) on each data line. Use Value: 309 pF capacitance avoids signal rise-time degradation; ±30 kV ESD rating exceeds USB-IF compliance requirements. |
| Industrial CAN FD Node | DC Power Rail Protection |
Use Scenario: Shielding CAN FD transceivers in factory automation gateways from EFT bursts and lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Unidirectional TVS connected between CAN_H/CAN_L and ground, with common-mode choke filtering. Use Value: 67 V clamping prevents transceiver damage during IEC 61000-4-4 EFT (4 kV) events while maintaining <1 ns response. |
Use Scenario: Hardening 48 V auxiliary power rails in ADAS domain controllers against load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary clamping device on input side of DC/DC converter, upstream of bulk capacitor. Use Value: 400 W rating absorbs 100 ms load dump energy without derating; 175 °C TJ max supports under-hood thermal environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A-E3/57T | Same VRWM (40 V), but 400 W rating at 10/1000 μs; VBR min/max wider (44.4–49.1 V); SMA package (larger than SMF) | Higher thermal mass suits higher average power; less suitable for ultra-thin automotive modules | Select for cost-sensitive industrial designs where board space allows SMA footprint |
| TPSMD40A | Same VRWM (40 V), but 600 W rating; VBR tighter (44.4–47.1 V); DO-214AB package; not AEC-Q101 qualified | Higher surge margin for harsher environments; lacks automotive qualification and halogen-free status | Select for non-automotive 48 V systems requiring extra surge headroom without qualification constraints |
Compared with SMAJ40A-E3/57T and TPSMD40A, VTVS40ASMF-HM3-18 offers superior automotive readiness (AEC-Q101 + halogen-free), smallest footprint (SMF vs. SMA/DO-214AB), and tighter design integration for space-constrained ECU modules - making it optimal for next-gen vehicle electronics where size, reliability, and compliance are co-prioritized.
Availability
VTVS40ASMF-HM3-18 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS sensor nodes, and industrial CAN FD gateways requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for VTVS40ASMF-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 diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The VTVS eSMP® Series targets automotive-grade transient protection with AEC-Q101 qualification, low capacitance, and compact SMF packaging - engineered specifically for ECU, sensor, and interface hardening in modern vehicles.
FAQ
What is the maximum clamping voltage of the VTVS40ASMF-HM3-18 under peak pulse conditions?
The VTVS40ASMF-HM3-18 has a maximum reverse clamping voltage (VC) of 67 V when subjected to its rated peak pulse current of 67 A (10/1000 μs waveform). This value is measured per standard test conditions in the Vishay datasheet (Doc. #85891, Rev. 2.2) and defines the upper voltage limit imposed on protected circuitry during surge events. The VTVS40ASMF-HM3-18 maintains this clamping performance across its full operating temperature range.
Is VTVS40ASMF-HM3-18 qualified for automotive use?
Yes, VTVS40ASMF-HM3-18 is AEC-Q101 qualified, meaning it has passed rigorous stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), temperature cycling (TCT), and mechanical shock - all required for automotive semiconductor components. The "H" in the part number explicitly denotes AEC-Q101 qualification, and the device is listed in Vishay's qualified automotive product portfolio for use in ECUs, sensors, and infotainment systems.
What does the "HM3-18" suffix indicate in VTVS40ASMF-HM3-18?
The "HM3-18" suffix encodes three key attributes: "H" indicates AEC-Q101 qualification; "M3" specifies halogen-free, RoHS-compliant, lead (Pb)-free terminations with tin plating; and "-18" denotes packaging in a 10K-per-13″ reel (8 mm tape), with minimum order quantity of 50K units. This coding aligns with Vishay's standardized ordering nomenclature documented in the VTVS family datasheet (85891).
Can VTVS40ASMF-HM3-18 be used in bidirectional signal lines like RS-485?
No - VTVS40ASMF-HM3-18 is a unidirectional TVS diode, optimized for protecting DC power rails or single-ended signals referenced to ground. For true bidirectional protection (e.g., RS-485, CAN), a dual-diode configuration or dedicated bidirectional TVS such as VTVS40BSMF-HM3-18 would be required. Using VTVS40ASMF-HM3-18 on a floating differential pair risks improper clamping during negative transients.
What is the thermal resistance junction-to-lead (RthJL) for VTVS40ASMF-HM3-18?
The thermal resistance junction-to-lead (RthJL) for VTVS40ASMF-HM3-18 is 20 K/W when mounted on an infinite heat sink, as specified in the Absolute Maximum Ratings table of the Vishay datasheet (85891). This value enables accurate thermal modeling of power dissipation during repetitive surge events and confirms suitability for high-temperature automotive environments up to TJ = +175 °C.
VTVS40ASMF-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):
- 39.6V
- Voltage - Breakdown (Min):
- 44.7V
- Voltage - Clamping (Max) @ Ipp:
- 67V
- Current - Peak Pulse (10/1000µs):
- 5.7A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 309pF @ 1MHz
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
VTVS40ASMF-HM3-18 FAQ
1.How can I place an order for VTVS40ASMF-HM3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for VTVS40ASMF-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 VTVS40ASMF-HM3-18 reliable?
The price and inventory of VTVS40ASMF-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 VTVS40ASMF-HM3-18 is usually 5 days.
3.What payment methods are accepted for VTVS40ASMF-HM3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VTVS40ASMF-HM3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VTVS40ASMF-HM3-18?
VTVS40ASMF-HM3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VTVS40ASMF-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 VTVS40ASMF-HM3-18?
For technical support, including VTVS40ASMF-HM3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VTVS40ASMF-HM3-18 requirements.
6.How does Aetrix verify that VTVS40ASMF-HM3-18 is sourced from the original manufacturer or authorized distributors?
All VTVS40ASMF-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 VTVS40ASMF-HM3-18 meets industry standards.
7.What is the process for return or replacement of VTVS40ASMF-HM3-18?
All VTVS40ASMF-HM3-18 units undergo pre-shipment inspection (PSI). If there is an issue with VTVS40ASMF-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 VTVS40ASMF-HM3-18 part is unused and in its original packaging.
Return procedure for VTVS40ASMF-HM3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
VTVS40ASMF-HM3-18 Tags
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