My Inquiry
My Account
Vishay General Semiconductor - Diodes Division VTVS21ASMF-HM3-08
- Part No.:
- VTVS21ASMF-HM3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
VTVS21ASMF-HM3-08.pdf
- Description:
- TVS DIODE 20.5VWM 34VC DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:29,965
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
VTVS21ASMF-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 low-voltage DC lines. It features a 20.5 V maximum stand-off voltage (VRWM), 23.0–25.4 V reverse breakdown voltage (VBR) at 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-HM3-08 datasheet, VTVS21ASMF-HM3-08 pinout, VTVS21ASMF-HM3-08 application, or VTVS21ASMF-HM3-08 equivalent, this page delivers verified electrical specs, SMF package dimensions, clamping performance under 10/1000 μs transients, halogen-free compliance, and AEC-Q101 qualification status - all critical for automotive-grade board-level ESD hardening.
Technical Context
This device operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its 23.0–25.4 V breakdown threshold to clamp transients while maintaining 20.5 V working margin. Its 34 V clamping voltage at 11.33 A (10/1000 μs) ensures downstream ICs like USB PD controllers or CAN transceivers remain within safe operating limits during surge events.
Constructed in the low-profile SMF (DO-219AB) package with 1.08 mm height and halogen-free molding compound, it supports wave and reflow soldering per J-STD-020 MSL level 1, and achieves ±30 kV contact/air discharge ESD protection - meeting stringent requirements for automotive interior electronics and industrial HMI interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W (10/1000 μs waveform - sustains high-energy surges without failure) |
| Stand-off Voltage (VRWM) | 20.5 V max - defines maximum continuous DC line voltage before leakage rises |
| Breakdown Voltage (VBR) | 23.0–25.4 V at IT = 1 mA - precise avalanche threshold enabling accurate overvoltage detection |
| Clamping Voltage (VC) | 34 V at IPPM = 11.33 A - limits transient voltage seen by protected ICs during surge |
| ESD Immunity | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - exceeds automotive ESD robustness requirements |
| Junction Temp Range | −55 °C to +175 °C - supports under-hood and engine-control module deployment |
| Capacitance (CD) | 513 pF at VR = 0 V, f = 1 MHz - suitable for <10 Mbps data lines; not for high-speed USB 3.0/PCIe |
Pinout & Package
SMF (DO-219AB) package: surface-mount, low-profile (1.08 mm height), cathode-marked end, compatible with SOD-123W footprint. Molded in halogen-free compound, MSL level 1, reflow-compatible up to 260 °C peak.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected signal or power rail; conducts during forward-biased operation |
| Cathode | Ground reference | Connected to system ground or low-impedance return path; defines unidirectional clamping direction |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Handles high-energy lightning-induced surges on 12 V/24 V automotive power nets |
| ±5 % VBR tolerance (A-suffix) | Enables tighter clamping margin control vs. ±2 % G-suffix variants in cost-sensitive designs |
| "Low-Noise" fast response | Nanosecond-scale turn-on ensures suppression before sensitive ICs experience overstress |
| AEC-Q101 qualified | Validated for automotive applications including infotainment, body control modules, and ADAS sensors |
| Halogen-free & RoHS-compliant | Meets EU ELV and automotive OEM material declaration requirements |
Applications
| Automotive Infotainment Power Rail | USB-C Port Protection |
|---|---|
|
Use Scenario: Protecting 20 V supply lines feeding head-unit display drivers and audio amplifiers from load-dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between input filter capacitor and LDO regulator input. Use Value: Limits voltage to ≤34 V during 11.33 A surges, preventing LDO thermal shutdown and preserving display functionality. |
Use Scenario: Safeguarding USB-C CC and VBUS lines against ESD events during hot-plug insertion in vehicle docking stations. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected between VBUS and chassis ground, with cathode to ground. Use Value: Clamps ±30 kV ESD strikes to <34 V within nanoseconds, avoiding USB PD controller latch-up or reset. |
| Industrial HMI Interface | Telematics Module Power Input |
|
Use Scenario: Shielding 24 V DC input of touch-screen controllers in factory HMIs from inductive switching noise and cable discharge events. IC Role / Device Role / Timing Role: Primary surge protector mounted at connector entry point, upstream of input EMI filter. Use Value: Absorbs 400 W pulses without degradation, maintaining >100,000 surge cycles per AEC-Q101 lifetime testing. |
Use Scenario: Securing 12 V power input of LTE/C-V2X telematics modules against battery-reverse and alternator-load-dump transients. IC Role / Device Role / Timing Role: First-line unidirectional TVS in power entry circuit, rated for −55 °C to +175 °C junction operation. Use Value: Operates reliably across full automotive temperature range while delivering 34 V clamping at 11.33 A peak current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| VTVS21GSMF-HM3-08 | ±2 % VBR tolerance (23.72–24.69 V) vs. ±5 % (23.0–25.4 V); identical VRWM, VC, and PPPM | Better precision for systems requiring tighter clamping consistency across temperature and unit variance | Select when design margins demand reduced VBR spread - e.g., safety-critical sensor power rails |
| SMAJ22A | Same VRWM (22 V), but higher VC (36 V at 11.2 A) and lower PPPM (400 W same, but lower IPPM derating above 25 °C) | Less effective clamping on 20.5 V rails; not AEC-Q101 qualified | Acceptable for non-automotive industrial use where AEC-Q101 and tight VC are not required |
Compared with VTVS21GSMF-HM3-08, the VTVS21ASMF-HM3-08 trades VBR precision for broader tolerance and lower cost; versus SMAJ22A, it delivers superior automotive qualification, tighter clamping, and guaranteed high-temp reliability - making it optimal for production automotive ECUs.
Availability
VTVS21ASMF-HM3-08 is available at Aetrix Electronics and suitable for automotive infotainment systems, USB-C docking stations, and industrial HMI interfaces requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant surge protection.
Supply support for VTVS21ASMF-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 TransZorb® TVS family - including VTVS21ASMF-HM3-08 - is engineered specifically for board-level ESD and surge protection in harsh environments, with emphasis on AEC-Q101 validation, low clamping voltage, and compact SMF packaging.
FAQ
What is the clamping voltage of the VTVS21ASMF-HM3-08 at its rated peak pulse current?
The VTVS21ASMF-HM3-08 has a maximum reverse clamping voltage (VC) of 34 V at 11.33 A peak pulse current (10/1000 μs waveform). This value is measured under standardized surge conditions and ensures protected downstream ICs remain below their absolute maximum ratings during transient events. The VTVS21ASMF-HM3-08 maintains this clamping performance across its full operating temperature range of −55 °C to +175 °C.
Is the VTVS21ASMF-HM3-08 AEC-Q101 qualified?
Yes, the VTVS21ASMF-HM3-08 is AEC-Q101 qualified, confirming its suitability for automotive applications including engine control units, infotainment systems, and ADAS modules. This qualification covers stress tests for temperature cycling, humidity, mechanical shock, and ESD robustness. The VTVS21ASMF-HM3-08 meets all requirements per the Vishay TransZorb® automotive-grade product line certification.
What does the "HM3-08" suffix indicate in VTVS21ASMF-HM3-08?
The "HM3-08" suffix denotes halogen-free (H), lead-free (M), 3 k per 7″ reel packaging (3), and RoHS-compliant termination plating (08). Specifically, "H" confirms halogen-free molding compound per Vishay's material categorization standard; "M" indicates matte tin plating; "3" specifies 3,000 units per 7-inch tape-and-reel; and "08" identifies the environmental compliance code. The VTVS21ASMF-HM3-08 is fully compliant with JEDEC J-STD-020 MSL level 1.
Can the VTVS21ASMF-HM3-08 be used in bidirectional signal lines?
No, the VTVS21ASMF-HM3-08 is a unidirectional TVS diode and must be oriented with cathode toward ground to function correctly. It is not suitable for bidirectional data lines like RS-485 or CAN without external circuitry. For such applications, a bidirectional variant (e.g., VTVS21BSMF-HM3-08) or dual-diode configuration would be required. The VTVS21ASMF-HM3-08's polarity is fixed and clearly marked by the cathode bar on the SMF package.
What is the typical capacitance of the VTVS21ASMF-HM3-08 and how does it affect circuit design?
The VTVS21ASMF-HM3-08 has a typical junction capacitance (CD) of 513 pF at VR = 0 V and f = 1 MHz. This value increases slightly at lower reverse voltages and decreases near VRWM. At 20.5 V bias, capacitance drops significantly - making it appropriate for <10 Mbps interfaces such as UART, LIN, or low-speed CAN, but unsuitable for USB 2.0 HS or HDMI signal lines where sub-2 pF is required. Designers must account for this capacitance in RC time constants and signal integrity analysis.
VTVS21ASMF-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):
- 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-HM3-08 FAQ
1.How can I place an order for VTVS21ASMF-HM3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for VTVS21ASMF-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 VTVS21ASMF-HM3-08 reliable?
The price and inventory of VTVS21ASMF-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 VTVS21ASMF-HM3-08 is usually 5 days.
3.What payment methods are accepted for VTVS21ASMF-HM3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VTVS21ASMF-HM3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VTVS21ASMF-HM3-08?
VTVS21ASMF-HM3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VTVS21ASMF-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 VTVS21ASMF-HM3-08?
For technical support, including VTVS21ASMF-HM3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VTVS21ASMF-HM3-08 requirements.
6.How does Aetrix verify that VTVS21ASMF-HM3-08 is sourced from the original manufacturer or authorized distributors?
All VTVS21ASMF-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 VTVS21ASMF-HM3-08 meets industry standards.
7.What is the process for return or replacement of VTVS21ASMF-HM3-08?
All VTVS21ASMF-HM3-08 units undergo pre-shipment inspection (PSI). If there is an issue with VTVS21ASMF-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 VTVS21ASMF-HM3-08 part is unused and in its original packaging.
Return procedure for VTVS21ASMF-HM3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
VTVS21ASMF-HM3-08 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
