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Vishay General Semiconductor - Diodes Division VTVS21ASMF-HM3-18
- Part No.:
- VTVS21ASMF-HM3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
VTVS21ASMF-HM3-18.pdf
- Description:
- TVS DIODE 20.5VWM 34VC DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,281
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Product details
Overview
VTVS21ASMF-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 20.5 V stand-off voltage (VRWM), 23.0–25.4 V reverse breakdown voltage (VBR at IT = 1 mA), 34 V maximum clamping voltage (VC) at 11.33 A peak pulse current, and ±30 kV IEC 61000-4-2 ESD immunity - deployed in automotive infotainment power rails and USB-C port protection.
For engineers reviewing the VTVS21ASMF-HM3-18 datasheet, VTVS21ASMF-HM3-18 pinout, VTVS21ASMF-HM3-18 application, or VTVS21ASMF-HM3-18 equivalent, key selection criteria include clamping performance under 10/1000 μs surges, thermal resistance (20 K/W), halogen-free compliance, AEC-Q101 qualification status, and compatibility with SOD-123W footprint layouts.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its 23.0–25.4 V breakdown threshold. Its low 20.5 V VRWM ensures reliable blocking during normal 24 V system operation while allowing fast response (<1 ns) to transients via "Low-Noise" silicon technology.
The device sustains 400 W peak pulse power (10/1000 μs waveform) with 34 V clamping at 11.33 A, limiting energy dissipation in protected ICs. Its DO-219AB package delivers 20 K/W junction-to-lead thermal resistance and supports wave/reflow soldering per J-STD-020 MSL level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W (10/1000 μs waveform; defines maximum transient energy absorption capability) |
| Stand-off Voltage (VRWM) | 20.5 V (maximum continuous reverse voltage before leakage exceeds 0.05 μA) |
| Breakdown Voltage (VBR) | 23.0–25.4 V at IT = 1 mA (avalanche initiation range; ±5 % tolerance) |
| Clamping Voltage (VC) | 34 V at IPPM = 11.33 A (voltage seen by protected circuit during worst-case surge) |
| ESD Immunity | ±30 kV contact & air discharge (IEC 61000-4-2; ensures robustness against human-body-model events) |
| Junction Temperature Range | −55 °C to +175 °C (supports under-hood automotive deployment without derating) |
| Capacitance (CD) | 513 pF at VR = 0 V, f = 1 MHz (impacts high-speed signal integrity; suitable for <10 Mbps interfaces) |
Pinout & Package
SMF (DO-219AB) low-profile surface-mount package: 3.9 mm × 1.9 mm × 1.08 mm body, cathode-bar marked, compatible with SOD-123W footprint and reflow/wave soldering per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during forward conduction | Connected to protected line's low-side return path; enables unidirectional clamping to ground |
| Cathode | Current exit during reverse avalanche | Connected to protected line input; clamps transients above VRWM to VC = 34 V |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Enables protection against ISO 7637-2 Pulse 1/2a/3a surges in 24 V automotive systems |
| ±30 kV ESD immunity | Meets IEC 61000-4-2 Level 4 for touch-point interfaces without external shielding |
| Low-profile SMF package | Reduces PCB real estate vs. SMA/SMB; fits tight spacing in USB-C and display port modules |
| AEC-Q101 qualified option | VTVS21ASMF-HM3-18 variant meets stress-test requirements for automotive-grade reliability |
| Halogen-free & RoHS-compliant | Complies with EU Directive 2011/65/EU and Vishay's material categorization standard 99912 |
Applications
| Automotive Infotainment Power Rail | USB-C Port Protection |
|---|---|
Use Scenario: 24 V supply line feeding head unit MCU and display drivers. IC Role / Device Role / Timing Role: Unidirectional TVS diode clamping positive transients to ground. Use Value: Limits voltage to ≤34 V during load-dump events, preventing damage to 3.3 V/5 V LDOs and PMICs. |
Use Scenario: VBUS line in Type-C receptacle exposed to hot-plug and ESD. IC Role / Device Role / Timing Role: Standoff protector with 20.5 V VRWM to avoid conduction during normal 5–20 V operation. Use Value: Clamps 30 kV ESD strikes within nanoseconds, preserving USB PD controller and CC logic integrity. |
| Industrial PLC Digital I/O | Automotive Body Control Module (BCM) |
Use Scenario: 24 V sensor input channel subject to inductive kickback from solenoid loads. IC Role / Device Role / Timing Role: Fast-response avalanche clamp shunting surge current away from microcontroller GPIO. Use Value: 11.33 A IPPM rating handles 100 mJ transients; 175 °C TJ max supports enclosure-mounted designs. |
Use Scenario: LIN bus power line in door module with shared 12 V rail. IC Role / Device Role / Timing Role: Unidirectional suppressor placed between fuse and local regulator. Use Value: 513 pF capacitance avoids signal distortion on 20 kbps LIN; AEC-Q101 qualification ensures field longevity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A | Higher VRWM (22 V), lower PPPM (400 W same), larger SMA package (DO-214AC) | Requires PCB layout change; less suitable for space-constrained USB-C modules | Select when legacy SMA footprint exists and thermal mass requirement exceeds SMF capability |
| SMF22A | Identical VRWM (22 V), same SMF package, but ±10 % VBR tolerance (vs. ±5 % for VTVS21ASMF-HM3-18) | Looser clamping consistency; may require margin increase in safety-critical designs | Choose for cost-sensitive industrial applications where tighter VBR control is nonessential |
Compared with SMAJ22A and SMF22A, VTVS21ASMF-HM3-18 offers tighter ±5 % VBR tolerance, AEC-Q101 qualification, and halogen-free construction - making it preferred for next-gen automotive electronics requiring validated reliability and regulatory compliance.
Availability
VTVS21ASMF-HM3-18 is available at Aetrix Electronics and suitable for automotive infotainment, USB-C interface protection, and industrial PLC I/O requiring stable component supply across multi-year production cycles.
Supply support for VTVS21ASMF-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 power management, sensing, and protection devices with emphasis on automotive, industrial, and computing applications.
The TransZorb® eSMP® Series - including VTVS21ASMF-HM3-18 - was engineered for high-reliability transient suppression in compact, thermally efficient packages targeting AEC-Q101-compliant automotive subsystems.
FAQ
What is the clamping voltage of VTVS21ASMF-HM3-18 under peak surge conditions?
The VTVS21ASMF-HM3-18 exhibits a maximum reverse clamping voltage (VC) of 34 V at 11.33 A peak pulse current (IPPM), measured using a 10/1000 μs waveform. This value ensures downstream 24 V-rated ICs remain within safe operating limits during ISO 7637-2 transients. The clamping performance is guaranteed across −55 °C to +175 °C junction temperature range.
Is VTVS21ASMF-HM3-18 qualified to AEC-Q101 standards?
Yes, VTVS21ASMF-HM3-18 is AEC-Q101 qualified - confirmed in Vishay's official documentation (Rev. 2.2, 19-Nov-2021, Doc. #85891). This qualification covers stress tests including HTGB, HTRB, TCT, and ESD, validating suitability for automotive under-hood and cabin applications. The "H" in the part number denotes AEC-Q101 qualification.
What package type does VTVS21ASMF-HM3-18 use, and is it compatible with standard SOD-123W footprints?
VTVS21ASMF-HM3-18 uses the SMF (DO-219AB) package - a halogen-free, low-profile surface-mount outline measuring 3.9 mm × 1.9 mm × 1.08 mm. Vishay explicitly states compatibility with SOD-123W, SOD-123F, and SOD-123FL case outlines, enabling drop-in replacement in existing layouts designed for those footprints.
How does the ±5 % VBR tolerance of VTVS21ASMF-HM3-18 compare to other variants in the VTVS family?
VTVS21ASMF-HM3-18 carries the "A" suffix, indicating ±5 % tolerance on its 23.0–25.4 V reverse breakdown voltage (VBR). This contrasts with "G"-suffix variants like VTVS21GSMF-HM3-18, which offer tighter ±2 % VBR tolerance. The ±5 % grade balances precision and cost for applications where minor clamping variation is acceptable, such as non-safety-critical 24 V power rails.
What is the typical junction-to-lead thermal resistance (RthJL) for VTVS21ASMF-HM3-18, and why does it matter?
The VTVS21ASMF-HM3-18 has a thermal resistance RthJL of 20 K/W when mounted on an infinite heat sink. This parameter directly determines how effectively heat generated during surge events transfers from the silicon junction to the PCB copper. A lower RthJL enables higher repetitive surge capability and improved long-term reliability in thermally constrained environments like sealed automotive enclosures.
VTVS21ASMF-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):
- 20.5V
- Voltage - Breakdown (Min):
- 23V
- Voltage - Clamping (Max) @ Ipp:
- 34V
- Current - Peak Pulse (10/1000µs):
- 11.33A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 513pF @ 1MHz
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
VTVS21ASMF-HM3-18 FAQ
1.How can I place an order for VTVS21ASMF-HM3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for VTVS21ASMF-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 VTVS21ASMF-HM3-18 reliable?
The price and inventory of VTVS21ASMF-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 VTVS21ASMF-HM3-18 is usually 5 days.
3.What payment methods are accepted for VTVS21ASMF-HM3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VTVS21ASMF-HM3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VTVS21ASMF-HM3-18?
VTVS21ASMF-HM3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VTVS21ASMF-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 VTVS21ASMF-HM3-18?
For technical support, including VTVS21ASMF-HM3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VTVS21ASMF-HM3-18 requirements.
6.How does Aetrix verify that VTVS21ASMF-HM3-18 is sourced from the original manufacturer or authorized distributors?
All VTVS21ASMF-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 VTVS21ASMF-HM3-18 meets industry standards.
7.What is the process for return or replacement of VTVS21ASMF-HM3-18?
All VTVS21ASMF-HM3-18 units undergo pre-shipment inspection (PSI). If there is an issue with VTVS21ASMF-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 VTVS21ASMF-HM3-18 part is unused and in its original packaging.
Return procedure for VTVS21ASMF-HM3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
VTVS21ASMF-HM3-18 Tags
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