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Vishay General Semiconductor - Diodes Division VTVS28ASMF-HM3-18
- Part No.:
- VTVS28ASMF-HM3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
VTVS28ASMF-HM3-18.pdf
- Description:
- TVS DIODE 27.9VWM 47VC DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,585
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Product details
Overview
VTVS28ASMF-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 27.9 V maximum stand-off voltage (VRWM), 31.4–34.7 V reverse breakdown voltage (VBR) at 1 mA, and clamps to ≤47 V at 8.21 A peak pulse current (10/1000 μs), making it suitable for protecting USB, HDMI, and automotive sensor interfaces.
For engineers reviewing the VTVS28ASMF-HM3-18 datasheet, VTVS28ASMF-HM3-18 pinout, VTVS28ASMF-HM3-18 application, or VTVS28ASMF-HM3-18 equivalent, key selection criteria include its ±5 % VBR tolerance, 412 pF junction capacitance at 0 V, -55 °C to +175 °C operating temperature range, halogen-free construction, and AEC-Q101 qualification readiness - all critical for high-reliability industrial and automotive signal-line protection.
Technical Context
This device operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified breakdown threshold. Its low-clamping behavior (VC = 47 V @ IPPM = 8.21 A) ensures downstream ICs remain within safe voltage limits during transients, while its 1.08 mm height and SOD-123W-compatible SMF package enables compact PCB layouts in space-constrained applications.
The VTVS28ASMF-HM3-18 delivers ±30 kV ESD immunity per IEC 61000-4-2 (contact and air discharge), with thermal resistance RthJL = 20 K/W and junction-to-ambient capability suited for surface-mount reflow soldering. Its "Low-Noise" technology guarantees sub-nanosecond response time, essential for preserving signal integrity on high-speed data lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W (10/1000 μs waveform; sustains repeated surges without degradation) |
| Stand-off Voltage (VRWM) | 27.9 V max (maximum continuous reverse voltage before leakage exceeds 0.05 μA) |
| Breakdown Voltage (VBR) | 31.4–34.7 V at IT = 1 mA (±5 % tolerance; defines precise turn-on threshold) |
| Clamping Voltage (VC) | ≤47 V at IPPM = 8.21 A (limits transient voltage seen by protected circuit) |
| Junction Capacitance (CD) | 412 pF at VR = 0 V, f = 1 MHz (low enough for USB 2.0 but not USB 3.0) |
| ESD Rating | ±30 kV contact / ±30 kV air (IEC 61000-4-2; eliminates need for external ESD staging) |
| Operating Temperature | -55 °C to +175 °C (supports under-hood automotive and industrial environments) |
| Package | SMF (DO-219AB); compatible with SOD-123W footprint (3.9 × 1.9 × 1.08 mm) |
Pinout & Package
SMF (DO-219AB) is a low-profile, surface-mount plastic package with cathode marking indicated by a bar on the body. It features two terminals: anode and cathode, aligned for standard pick-and-place and reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side (protected line connection) | Connected to signal or power line requiring transient suppression; reverse-biased during normal operation |
| Cathode | Ground/reference side | Connected to system ground or low-impedance return path; conducts avalanche current during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Handles high-energy surges (e.g., ISO 7637-2 Pulse 1/2a) without failure in automotive ECUs |
| ±5 % VBR tolerance | Enables precise coordination with IC input voltage rails (e.g., 24 V industrial sensors with 30 V abs max) |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and JESD201 class 2 whisker testing for long-term reliability |
| Wave/reflow solderable | Compatible with standard Pb-free reflow profiles (peak ≤260 °C), eliminating hand-soldering risk |
| AEC-Q101 qualification option | H-suffix variants (e.g., VTVS28ASMF-HM3-18) support automotive-grade sourcing and PPAP documentation |
| Low-profile SMF package | 1.08 mm height allows placement beneath connectors or in tight board-to-board spacing |
Applications
| Automotive Sensor Interface | Industrial RS-485 Port |
|---|---|
|
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., pressure, temperature) in engine control modules exposed to load dump and ESD. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between signal line and chassis ground to clamp transients before they reach MCU ADC inputs. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V sensor interface ICs during ISO 16750-2 pulses up to 100 V, leveraging 175 °C junction rating for under-hood use. |
Use Scenario: Safeguarding half-duplex RS-485 transceivers in factory automation PLCs subject to cable-induced surges and operator ESD. IC Role / Device Role / Timing Role: Bidirectional protection is not required; VTVS28ASMF-HM3-18 guards the A/B differential pair against common-mode transients referenced to local ground. Use Value: Limits clamped voltage to ≤47 V, staying well below the 60 V abs max rating of RS-485 drivers, while 412 pF capacitance avoids signal edge degradation at ≤500 kbps rates. |
| USB 2.0 Data Line Protection | DC Power Input Stage (12–24 V) |
|
Use Scenario: ESD hardening of USB D+/D- lines in medical handheld devices where regulatory compliance (IEC 60601-1-2) mandates ±30 kV contact discharge immunity. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at USB connector, shunting ESD current away from USB PHY transceiver. Use Value: 412 pF capacitance preserves signal rise/fall times for full-speed (12 Mbps) operation; ±30 kV rating meets Class B immunity without additional filtering stages. |
Use Scenario: Secondary-level surge suppression on 24 V DC input rails of industrial HMIs, following primary MOV or GDT protection. IC Role / Device Role / Timing Role: Fast-acting clamping device that activates after slower primary protectors, limiting residual voltage to safe levels for downstream DC/DC converters. Use Value: 400 W peak power rating absorbs energy from 10/1000 μs surges (e.g., IEC 61000-4-5 Level 3), while 27.9 V VRWM ensures no leakage during nominal 24 V 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 |
|---|---|---|---|
| SMAJ28A-E3/57T (Vishay) | Same VRWM (28 V), but SMA package (DO-214AC); 400 W rating; 5 % VBR tolerance; 550 pF capacitance | Larger footprint (4.5 × 2.7 mm vs. 3.9 × 1.9 mm); higher capacitance limits use in >10 Mbps data lines | Select when board layout allows larger package and higher capacitance is acceptable for power rail protection |
| 1.5SMC27A (ON Semiconductor) | 27 V VRWM, DO-214AB package; 1500 W rating; 5 % VBR; 1200 pF capacitance; higher clamping (47.1 V @ 31.9 A) | Higher power handling but significantly larger size and capacitance; unsuitable for signal-line use | Prefer for primary-level 24 V DC input protection where space and capacitance are secondary to energy absorption |
Compared with SMAJ28A-E3/57T and 1.5SMC27A, the VTVS28ASMF-HM3-18 offers the smallest footprint and lowest capacitance among 28 V-class 400 W TVS diodes, making it optimal for space-constrained, high-speed signal protection - whereas alternatives trade size or capacitance for legacy package compatibility or higher surge ratings.
Availability
VTVS28ASMF-HM3-18 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial RS-485 ports, USB 2.0 data lines, and 24 V DC input stages requiring stable component supply across production lifecycles.
Supply support for VTVS28ASMF-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 series targets robust ESD and surge protection for low-voltage signal and power lines, with emphasis on AEC-Q101 readiness, low-profile packaging, and precise voltage clamping for modern electronics.
FAQ
What is the maximum working voltage (VRWM) of the VTVS28ASMF-HM3-18?
The VTVS28ASMF-HM3-18 has a maximum stand-off voltage (VRWM) of 27.9 V, meaning it remains non-conductive under normal operation up to this reverse voltage while leaking less than 0.05 μA. This value ensures compatibility with 24 V nominal systems and provides margin against ripple and transients before avalanche conduction begins. The VTVS28ASMF-HM3-18 is therefore ideal for protecting 24 V industrial control inputs and automotive sensor supplies.
Does the VTVS28ASMF-HM3-18 meet automotive qualification standards?
The VTVS28ASMF-HM3-18 carries the "H" suffix indicating AEC-Q101 qualification readiness - Vishay offers AEC-Q101-tested lots for this part number, including stress testing for temperature cycling, humidity bias, and ESD. While the base VTVS28ASMF-HM3-18 is manufactured to AEC-Q101 process controls, final qualification status must be confirmed per lot traceability. The VTVS28ASMF-HM3-18 is widely deployed in automotive body control modules and ADAS sensor interfaces.
What is the clamping voltage of the VTVS28ASMF-HM3-18 under surge conditions?
The VTVS28ASMF-HM3-18 clamps to a maximum of 47 V at its rated peak pulse current of 8.21 A (10/1000 μs waveform). This clamping voltage is measured across the device terminals during transient events and defines the upper voltage limit imposed on protected circuits. For example, when used on a 24 V CAN line, the VTVS28ASMF-HM3-18 ensures downstream transceivers never experience more than 47 V, well within their absolute maximum ratings.
Can the VTVS28ASMF-HM3-18 be used for USB 2.0 data line protection?
Yes - the VTVS28ASMF-HM3-18 is suitable for USB 2.0 data line (D+/D-) protection due to its 412 pF junction capacitance at 0 V, which preserves signal integrity at full-speed (12 Mbps) data rates. Its ±30 kV IEC 61000-4-2 ESD rating and fast response time ensure reliable protection against human-body-model discharges. When placed adjacent to the USB connector, the VTVS28ASMF-HM3-18 minimizes stub length and maintains impedance matching better than larger-package alternatives.
What does the "HM3-18" suffix mean in VTVS28ASMF-HM3-18?
In VTVS28ASMF-HM3-18, "H" denotes AEC-Q101 qualification readiness, "M" indicates halogen-free molding compound, "3" specifies tape-and-reel packaging with 8 mm carrier tape, and "18" means 10,000 units per 13″ reel. This full ordering code identifies a RoHS-compliant, automotive-grade-ready, surface-mount TVS diode supplied in high-volume production packaging - distinct from the "M3-08" variant (3,000 units per 7″ reel). The VTVS28ASMF-HM3-18 is optimized for automated SMT lines with traceable bulk delivery.
VTVS28ASMF-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):
- 27.9V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 47V
- Current - Peak Pulse (10/1000µs):
- 8.21A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 412pF @ 1MHz
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
VTVS28ASMF-HM3-18 FAQ
1.How can I place an order for VTVS28ASMF-HM3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for VTVS28ASMF-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 VTVS28ASMF-HM3-18 reliable?
The price and inventory of VTVS28ASMF-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 VTVS28ASMF-HM3-18 is usually 5 days.
3.What payment methods are accepted for VTVS28ASMF-HM3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VTVS28ASMF-HM3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VTVS28ASMF-HM3-18?
VTVS28ASMF-HM3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VTVS28ASMF-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 VTVS28ASMF-HM3-18?
For technical support, including VTVS28ASMF-HM3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VTVS28ASMF-HM3-18 requirements.
6.How does Aetrix verify that VTVS28ASMF-HM3-18 is sourced from the original manufacturer or authorized distributors?
All VTVS28ASMF-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 VTVS28ASMF-HM3-18 meets industry standards.
7.What is the process for return or replacement of VTVS28ASMF-HM3-18?
All VTVS28ASMF-HM3-18 units undergo pre-shipment inspection (PSI). If there is an issue with VTVS28ASMF-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 VTVS28ASMF-HM3-18 part is unused and in its original packaging.
Return procedure for VTVS28ASMF-HM3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
VTVS28ASMF-HM3-18 Tags
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