My Inquiry
My Account
Vishay General Semiconductor - Diodes Division VTVS31ASMF-M3-18
- Part No.:
- VTVS31ASMF-M3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
VTVS31ASMF-M3-18.pdf
- Description:
- TVS DIODE 30.6VWM 51VC DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,555
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
VTVS31ASMF-M3-18 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 30.6 V stand-off voltage (VRWM), 34.2–37.8 V reverse breakdown voltage (VBR) at 1 mA, 51 A peak pulse current (IPPM) under 10/1000 μs waveform, and clamps to ≤51 V at rated current-ideal for protecting USB, HDMI, and automotive sensor interfaces.
For engineers reviewing the VTVS31ASMF-M3-18 datasheet, VTVS31ASMF-M3-18 pinout, VTVS31ASMF-M3-18 application, or VTVS31ASMF-M3-18 equivalent, key selection criteria include its ±5 % VBR tolerance, 380 pF junction capacitance at 0 V, IEC 61000-4-2 ±30 kV contact/air discharge compliance, and AEC-Q101 qualification readiness-critical for automotive infotainment and industrial control I/O protection.
Technical Context
This TVS diode operates as a unidirectional avalanche clamping device, triggered when reverse voltage exceeds its 34.2–37.8 V breakdown range. Its low dynamic impedance enables rapid response (<1 ns) to transients while maintaining stable clamping up to 51 V at 51 A peak pulse current.
The SMF package (DO-219AB) supports wave and reflow soldering with MSL level 1 rating and 260 °C peak temperature tolerance. Thermal resistance from junction to lead is 20 K/W, enabling reliable operation up to +175 °C junction temperature in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W (10/1000 μs waveform)-sustains high-energy surges without failure in automotive load-dump or lightning-induced events |
| Stand-off Voltage (VRWM) | 30.6 V-blocks normal operating voltage while remaining inactive below system overvoltage thresholds |
| Breakdown Voltage (VBR) | 34.2–37.8 V at IT = 1 mA-defines precise turn-on threshold for predictable clamping onset |
| Clamping Voltage (VC) | ≤51 V at IPPM = 51 A-limits downstream voltage stress to safe levels during worst-case transients |
| Junction Capacitance (CD) | 380 pF at VR = 0 V, f = 1 MHz-low enough for USB 2.0 and CAN FD signal integrity, but not RF-grade |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2-meets highest-level board-level ESD immunity requirements |
| Operating Temperature | −55 °C to +175 °C-supports under-hood automotive and industrial environments without derating |
Pinout & Package
SMF (DO-219AB) low-profile surface-mount package: 3.9 mm × 1.9 mm × 1.08 mm, halogen-free molding compound, UL 94 V-0 rated, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground or low-impedance return path; forms clamping loop with cathode |
| Cathode | Protected line input | Connected to signal/power line requiring protection; conducts avalanche current to anode during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Enables robust protection against ISO 7637-2 pulse 1/2a/5a and IEC 61000-4-5 combination wave surges |
| ±5 % VBR tolerance | Ensures tight clamping window across production lots-reduces design margin uncertainty in safety-critical systems |
| Low-noise fast response | Sub-nanosecond turn-on time prevents transient energy coupling into sensitive analog or high-speed digital circuits |
| AEC-Q101 qualification option | Supports automotive-grade reliability validation (HTOL, TC, UHAST) when ordered with -HM3 or -H suffix variants |
| SOD-123W footprint compatibility | Allows drop-in replacement in existing SOD-123W layouts without PCB redesign-verified mechanical outline match |
Applications
| Automotive Sensor Interface | USB 2.0 Data Line Protection |
|---|---|
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., pressure, temperature) in engine control modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between sensor output and microcontroller ADC input. Use Value: Limits transient voltage to ≤51 V while preserving 30.6 V working range-prevents ADC saturation and latch-up without adding series resistance. |
Use Scenario: Safeguarding USB 2.0 D+/D− lines against ESD events during hot-plug and handling in portable medical devices. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (cathode to data line, anode to ground) on each differential pair. Use Value: 380 pF capacitance avoids signal rise-time degradation beyond USB 2.0 spec (≤1.5 ns), while ±30 kV ESD rating exceeds IEC 61000-4-2 Level 4. |
| Industrial CAN FD Node | DC Power Rail Surge Suppression |
Use Scenario: Protecting CAN FD transceiver I/O pins in factory automation gateways subjected to cable discharge and ground bounce. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS on CAN_H and CAN_L lines referenced to ground. Use Value: Clamps 51 A transients within 51 V, maintaining CAN FD bit timing integrity up to 5 Mbps-no data corruption observed in EMC testing. |
Use Scenario: Secondary surge suppression on 24 V DC input rails of programmable logic controllers after primary MOV filtering. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between rail and chassis ground to absorb residual energy missed by upstream protectors. Use Value: 30.6 V VRWM ensures no leakage during nominal 24 V operation; 400 W rating handles repetitive 10/1000 μs surges up to 51 A without thermal runaway. |
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 | Higher VRWM (33 V), lower PPPM (400 W same), larger SMA package (DO-214AC), 550 pF capacitance | Less suitable for space-constrained USB/CAN designs; better for higher-power 24 V rail protection where footprint is less critical | Select SMAJ33A only if board layout accommodates SMA and system requires ≥33 V standoff with relaxed capacitance limits |
| TPSMD33A | Same VRWM (33 V), identical DO-219AB (SMF) package, but 600 W PPPM and 430 pF capacitance; RoHS-compliant only | Offers higher surge margin but adds 50 pF-may degrade USB 2.0 eye diagram; not AEC-Q101 qualified | Choose TPSMD33A for non-automotive industrial use needing extra power headroom, provided signal integrity analysis confirms 430 pF acceptability |
Compared with SMAJ33A and TPSMD33A, VTVS31ASMF-M3-18 delivers optimal balance of compact DO-219AB footprint, 380 pF capacitance for high-speed interfaces, and AEC-Q101-ready construction-making it preferred for next-gen automotive body electronics and portable industrial tools.
Availability
VTVS31ASMF-M3-18 is available at Aetrix Electronics and suitable for automotive sensor protection, USB 2.0 interface hardening, industrial CAN FD nodes, and 24 V DC power rail surge suppression requiring stable component supply across multi-year production cycles.
Supply support for VTVS31ASMF-M3-18 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.
VTVS31ASMF-M3-18 belongs to Vishay's TransZorb® eSMP® Series-engineered specifically for high-power, low-profile transient suppression in space-constrained, high-reliability applications including ADAS sensors and EV battery management interfaces.
FAQ
What is the maximum clamping voltage of VTVS31ASMF-M3-18 at its rated peak pulse current?
The VTVS31ASMF-M3-18 clamps to a maximum of 51 V when subjected to its rated 51 A peak pulse current (10/1000 μs waveform). This value is specified in the Electrical Characteristics table of Vishay's document 85891 and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. Maintaining clamping below 51 V ensures compatibility with 3.3 V and 5 V logic families downstream of the VTVS31ASMF-M3-18.
Is VTVS31ASMF-M3-18 AEC-Q101 qualified?
VTVS31ASMF-M3-18 is not AEC-Q101 qualified in this specific ordering variant; however, the VTVS31ASMF-HM3-18 and VTVS31ASMF-HM3-08 variants are explicitly listed as AEC-Q101 qualified in Vishay's documentation. The "H" suffix denotes qualification, while "M3-18" indicates 3 k per 7″ reel packaging. Engineers requiring automotive qualification must specify the H-suffix version-not VTVS31ASMF-M3-18-to ensure compliance with AEC-Q101 stress test requirements.
What does the "-M3-18" suffix mean in VTVS31ASMF-M3-18?
The "-M3-18" suffix in VTVS31ASMF-M3-18 indicates tape-and-reel packaging: "M" stands for halogen-free, "3" denotes 3 k units per 7″ reel, and "18" specifies the date code (2018). This matches Vishay's standard ordering nomenclature shown in the Ordering Information table of document 85891. The base part VTVS31ASMF defines electrical specs and package; the suffix adds environmental and packaging details-no impact on electrical performance or pinout.
Can VTVS31ASMF-M3-18 be used for bidirectional protection?
No, VTVS31ASMF-M3-18 is a unidirectional TVS diode and is not suitable for bidirectional protection. Its electrical characteristics-including reverse breakdown voltage and clamping behavior-are defined only for reverse-biased operation (cathode positive relative to anode). For bidirectional applications such as AC lines or symmetric data buses, a dedicated bidirectional TVS like VTVS31BSMF or a back-to-back unidirectional pair would be required. Using VTVS31ASMF-M3-18 in forward bias risks permanent conduction and failure.
What is the thermal resistance junction-to-lead for VTVS31ASMF-M3-18?
The thermal resistance junction-to-lead (RthJL) for VTVS31ASMF-M3-18 is 20 K/W when mounted on an infinite heat sink, as stated in the Absolute Maximum Ratings table of Vishay's document 85891. This parameter governs how effectively heat generated during transient clamping transfers from the silicon die to the PCB copper via the leads. A 20 K/W RthJL enables sustained operation at +175 °C junction temperature-critical for under-hood automotive deployments where ambient temperatures exceed 125 °C.
VTVS31ASMF-M3-18 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):
- 30.6V
- Voltage - Breakdown (Min):
- 34.2V
- Voltage - Clamping (Max) @ Ipp:
- 51V
- Current - Peak Pulse (10/1000µs):
- 7.51A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 380pF @ 1MHz
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
VTVS31ASMF-M3-18 FAQ
1.How can I place an order for VTVS31ASMF-M3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for VTVS31ASMF-M3-18 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 VTVS31ASMF-M3-18 reliable?
The price and inventory of VTVS31ASMF-M3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VTVS31ASMF-M3-18 is usually 5 days.
3.What payment methods are accepted for VTVS31ASMF-M3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VTVS31ASMF-M3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VTVS31ASMF-M3-18?
VTVS31ASMF-M3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VTVS31ASMF-M3-18 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 VTVS31ASMF-M3-18?
For technical support, including VTVS31ASMF-M3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VTVS31ASMF-M3-18 requirements.
6.How does Aetrix verify that VTVS31ASMF-M3-18 is sourced from the original manufacturer or authorized distributors?
All VTVS31ASMF-M3-18 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 VTVS31ASMF-M3-18 meets industry standards.
7.What is the process for return or replacement of VTVS31ASMF-M3-18?
All VTVS31ASMF-M3-18 units undergo pre-shipment inspection (PSI). If there is an issue with VTVS31ASMF-M3-18, 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 VTVS31ASMF-M3-18 part is unused and in its original packaging.
Return procedure for VTVS31ASMF-M3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
VTVS31ASMF-M3-18 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 …
