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Vishay General Semiconductor - Diodes Division VTVS33ASMF-HM3-18
- Part No.:
- VTVS33ASMF-HM3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
VTVS33ASMF-HM3-18.pdf
- Description:
- TVS DIODE 33.3VWM 55VC DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,880
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Product details
Overview
VTVS33ASMF-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 a 33.3 V stand-off voltage (VRWM), 37.1–41.0 V reverse breakdown voltage (VBR) at 1 mA, 55 A peak pulse current (IPPM), and clamps to ≤55 V at rated surge, with ±30 kV IEC 61000-4-2 ESD immunity.
For engineers reviewing the VTVS33ASMF-HM3-18 datasheet, VTVS33ASMF-HM3-18 pinout, VTVS33ASMF-HM3-18 application, or VTVS33ASMF-HM3-18 equivalent, this device is selected for robust overvoltage protection in space-constrained, high-reliability PCBs where low-profile SOD-123W-compatible packaging, halogen-free construction, and AEC-Q101 qualification (via HM3 suffix) are required.
Technical Context
This TVS diode operates as a unidirectional clamping device, leveraging avalanche breakdown to divert transient energy away from sensitive downstream circuitry. Its 1.08 mm height and 3.9 × 1.9 mm footprint enable placement on dense signal traces without compromising board real estate.
The device delivers 400 W peak pulse power (10/1000 μs waveform) with thermal resistance RthJL = 20 K/W when mounted on an infinite heat sink, and maintains stable clamping performance across -55 °C to +175 °C junction temperature range - supporting under-hood automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 33.3 V - maximum continuous reverse working voltage before significant leakage; ensures no interference during normal 3.3 V or 5 V rail operation. |
| Breakdown Voltage (VBR) | 37.1–41.0 V at IT = 1 mA - tight ±5 % tolerance enables predictable triggering margin above VRWM. |
| Peak Pulse Current (IPPM) | 55 A (10/1000 μs) - sustains high-energy transients like ISO 7637-2 pulse 1/2a without failure. |
| Clamping Voltage (VC) | ≤55 V at IPPM - limits voltage seen by protected ICs to safe levels during surge events. |
| ESD Rating | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - exceeds Level 4 immunity requirements for end-equipment certification. |
| Capacitance (CD) | 379 pF at VR = 0 V, f = 1 MHz - suitable for low-speed data lines; avoids signal integrity issues on USB 2.0 or CAN. |
| Package | SMF (DO-219AB) - industry-standard low-profile outline compatible with SOD-123W footprints and reflow soldering. |
Pinout & Package
SMF (DO-219AB) package: 2-terminal surface-mount device with cathode marked by bar; dimensions 3.9 mm × 1.9 mm × 1.08 mm; compatible with SOD-123W, SOD-123F, and SOD-123FL land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to ground or low-impedance reference plane; carries full surge current during clamping. |
| Cathode | Protected line connection | Connected directly to the signal or power line requiring protection; defines polarity and clamping threshold. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables single-device protection against severe load-dump and inductive-switching surges in automotive ECUs. |
| ±5 % VBR tolerance | Guarantees consistent clamping onset across production lots, reducing design margin uncertainty. |
| Low-profile SMF package | 1.08 mm height allows placement beneath connectors or in tight spacing between high-speed traces. |
| Halogen-free, RoHS-compliant, lead-free terminations | Meets automotive and industrial environmental compliance mandates without sacrificing thermal or electrical performance. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress per JESD22-A114. |
Applications
| Automotive Sensor Interface | USB 2.0 Port Protection |
|---|---|
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., pressure, temperature) in engine control modules exposed to ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between sensor signal line and chassis ground. Use Value: Limits transient voltage to ≤55 V, preventing damage to 3.3 V/5 V ADC inputs while maintaining <0.05 μA leakage at 33.3 V. |
Use Scenario: Safeguarding USB D+/D- lines in infotainment head units against ESD events during connector mating/unmating. IC Role / Device Role / Timing Role: Bidirectional-capable protection via two unidirectional devices (one per line) referenced to common ground. Use Value: Withstands ±30 kV contact discharge per IEC 61000-4-2 while adding only 379 pF capacitance - no USB 2.0 timing violation. |
| Industrial PLC Digital Input | DC Power Rail Protection |
Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between input terminal and internal 24 V supply rail. Use Value: Clamps 55 A transients to ≤55 V, ensuring downstream optocoupler or Schmitt trigger remains within absolute maximum ratings. |
Use Scenario: Guarding 3.3 V or 5 V microcontroller supply rails against board-level ESD coupling and switching noise. IC Role / Device Role / Timing Role: Low-leakage (0.05 μA max) unidirectional clamp from VCC to GND, placed near IC power pins. Use Value: Provides 400 W surge handling without degrading quiescent current budget or causing false resets during normal operation. |
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-E3/57T | Same VRWM (33 V), but SMA package (DO-214AC); 400 W rating; ±5 % VBR; higher RthJA (50 K/W vs. 20 K/W). | Larger footprint (4.5 × 2.7 mm) and 2.4 mm height limit routing density; less suitable for ultra-thin modules. | Select VTVS33ASMF-HM3-18 when board space or thermal performance under sustained surge is critical. |
| 1.5SMC33A | Same VRWM (33 V), SMC package (DO-214AB); 1500 W rating; ±5 % VBR; 3x higher clamping voltage (69.4 V). | Higher VC reduces protection margin for 3.3 V/5 V ICs; larger size (7.1 × 6.2 mm) incompatible with compact layouts. | Choose VTVS33ASMF-HM3-18 for tighter clamping and smaller form factor in consumer or automotive electronics. |
Compared with SMAJ33A-E3/57T and 1.5SMC33A, VTVS33ASMF-HM3-18 offers superior thermal dissipation (RthJL = 20 K/W), lower profile (1.08 mm), and tighter clamping (≤55 V), making it optimal for space- and reliability-constrained designs where precise voltage limiting is essential.
Availability
VTVS33ASMF-HM3-18 is available at Aetrix Electronics and suitable for automotive sensor interfaces, USB 2.0 port protection, and industrial PLC digital inputs requiring stable component supply, AEC-Q101 qualification, and halogen-free compliance.
Supply support for VTVS33ASMF-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, and passive components for automotive, industrial, and computing markets.
The VTVS series targets robust ESD and surge protection in harsh environments, with the SMF variant optimized for low-profile, high-density PCBs needing AEC-Q101 validation and IEC 61000-4-2 compliance.
FAQ
What is the maximum operating temperature for VTVS33ASMF-HM3-18?
VTVS33ASMF-HM3-18 supports a junction temperature range of -55 °C to +175 °C, enabling use in under-hood automotive applications and industrial environments with elevated ambient temperatures. This rating is validated per AEC-Q101 stress tests and confirmed in the Vishay datasheet Rev. 2.2.
Does VTVS33ASMF-HM3-18 meet automotive qualification standards?
Yes, the "HM3" suffix in VTVS33ASMF-HM3-18 indicates AEC-Q101 qualification, covering temperature cycling, high-temperature reverse bias (HTRB), and ESD stress testing. This makes VTVS33ASMF-HM3-18 suitable for automotive body electronics, sensor modules, and infotainment systems.
What does the "A" in VTVS33ASMF-HM3-18 signify?
The "A" in VTVS33ASMF-HM3-18 denotes ±5 % tolerance on the reverse breakdown voltage (VBR), distinguishing it from "G" variants (±2 %). For VTVS33ASMF-HM3-18, VBR is specified as 37.1–41.0 V at IT = 1 mA, providing a reliable clamping window above its 33.3 V stand-off voltage.
Can VTVS33ASMF-HM3-18 be used for bidirectional protection?
No, VTVS33ASMF-HM3-18 is a unidirectional TVS diode. For bidirectional protection, two VTVS33ASMF-HM3-18 devices must be connected in series opposition (anode-to-anode), or a dedicated bidirectional part like VTVS33BSMF-HM3-18 should be selected instead.
What is the typical capacitance of VTVS33ASMF-HM3-18 at zero bias?
The typical junction capacitance of VTVS33ASMF-HM3-18 is 379 pF measured at VR = 0 V and f = 1 MHz. This value is confirmed in the Electrical Characteristics table of the Vishay datasheet and remains stable up to ~80 % of VRWM, making it appropriate for low-speed data lines.
VTVS33ASMF-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):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 55V
- Current - Peak Pulse (10/1000µs):
- 6.91A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 379pF @ 1MHz
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
VTVS33ASMF-HM3-18 FAQ
1.How can I place an order for VTVS33ASMF-HM3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for VTVS33ASMF-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 VTVS33ASMF-HM3-18 reliable?
The price and inventory of VTVS33ASMF-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 VTVS33ASMF-HM3-18 is usually 5 days.
3.What payment methods are accepted for VTVS33ASMF-HM3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VTVS33ASMF-HM3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VTVS33ASMF-HM3-18?
VTVS33ASMF-HM3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VTVS33ASMF-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 VTVS33ASMF-HM3-18?
For technical support, including VTVS33ASMF-HM3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VTVS33ASMF-HM3-18 requirements.
6.How does Aetrix verify that VTVS33ASMF-HM3-18 is sourced from the original manufacturer or authorized distributors?
All VTVS33ASMF-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 VTVS33ASMF-HM3-18 meets industry standards.
7.What is the process for return or replacement of VTVS33ASMF-HM3-18?
All VTVS33ASMF-HM3-18 units undergo pre-shipment inspection (PSI). If there is an issue with VTVS33ASMF-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 VTVS33ASMF-HM3-18 part is unused and in its original packaging.
Return procedure for VTVS33ASMF-HM3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
VTVS33ASMF-HM3-18 Tags
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