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Vishay General Semiconductor - Diodes Division SM6T18AHM3_A/H
- Part No.:
- SM6T18AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18AHM3_A/H.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,075
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Product details
Overview
SM6T18AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount TRANSZORB® transient voltage suppressor in SMB (DO-214AA) package, with 15.3 V standoff voltage (VWM), 17.1–18.9 V breakdown voltage (VBR at 1.0 mA), 25.2 V clamping voltage (VC) at 24.0 A peak pulse current, and 600 W peak pulse power rating per 10/1000 μs waveform. It protects MOSFETs and sensor signal lines in automotive ECUs against inductive switching transients.
For engineers reviewing the SM6T18AHM3_A/H datasheet, SM6T18AHM3_A/H pinout, SM6T18AHM3_A/H application, or SM6T18AHM3_A/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, low clamping ratio (VC/VBR ≈ 1.43), and thermal resistance of 100 °C/W junction-to-ambient.
Technical Context
This device operates as a unidirectional TVS diode with glass-passivated junction, designed for clamping fast-rising transients on DC power rails and low-speed signal lines. Its 100 °C/W RθJA and 20 °C/W RθJL support operation up to +150 °C junction temperature under defined pad layout conditions.
The SM6T18AHM3_A/H delivers 600 W peak pulse power with 10/1000 μs waveform while maintaining <1.0 μA reverse leakage at 15.3 V and clamping to ≤25.2 V at 24.0 A - enabling robust protection for 12 V automotive systems without excessive voltage overshoot during surge events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15.3 V - maximum continuous reverse operating voltage before significant leakage begins |
| VBR (min/max) | 17.1 V / 18.9 V at 1.0 mA - ensures reliable turn-on above system nominal voltage with margin |
| VC @ IPPM | 25.2 V at 24.0 A (10/1000 μs) - limits protected circuit voltage during worst-case surge |
| PPPM | 600 W - handles ISO 7637-2 Pulse 1/2a/5a-level transients in automotive environments |
| TJ max | +150 °C - supports under-hood deployment with standard PCB copper pad layout |
| RθJA | 100 °C/W - defines thermal derating curve for sustained power dissipation on 5.0 mm × 5.0 mm pads |
| AEC-Q101 | Qualified - validated for automotive electronics per stress test requirements (HM3 suffix) |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VLINE exceeds VBR |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path for clamping action |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables single-device protection against ISO 7637-2 Pulse 5a (load dump) in 12 V systems |
| Low clamping ratio (VC/VBR ≈ 1.43) | Minimizes overvoltage stress on downstream ICs compared to higher-ratio TVS devices |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive use including temperature cycling, HTRB, and ESD testing |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns |
| Glass passivated junction | Ensures stable VBR and low leakage over lifetime and temperature extremes |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting LIN bus transceiver inputs from load-dump and jump-start transients in BCM nodes. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between LIN line and ground, triggered within nanoseconds of overvoltage event. Use Value: Limits voltage to ≤25.2 V during 24.0 A surge, preventing damage to TI SN65HVDA100 or ST TLE7250 LIN transceivers. | Use Scenario: Safeguarding 24 V DC digital input channels in programmable logic controllers exposed to relay coil flyback. IC Role / Device Role / Timing Role: Standoff protection element across input terminals, conducting only during >15.3 V excursions. Use Value: Withstands 100 A IFSM surge and maintains <1.0 μA leakage at 15.3 V, ensuring stable logic threshold detection. |
| Automotive Sensor Signal Line (e.g., ABS Wheel Speed) | Consumer Appliance Motor Driver Protection |
Use Scenario: Shielding active wheel speed sensor outputs from alternator ripple and ignition noise in chassis-ground-referenced systems. IC Role / Device Role / Timing Role: Low-capacitance unidirectional clamp on sensor output line, referenced to chassis ground. Use Value: Clamps transients to 25.2 V while adding negligible capacitance (<100 pF at 0 V), preserving signal integrity up to 100 kHz. | Use Scenario: Suppressing back-EMF spikes from brushed DC motors in washing machine control boards. IC Role / Device Role / Timing Role: Primary overvoltage protection on motor driver supply rail, placed adjacent to H-bridge MOSFETs. Use Value: Dissipates 600 W peak energy without degradation, extending MOSFET lifetime under repeated stall conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/52 | Same VWM (15.3 V), same SMB package, but lower PPPM (400 W) and higher VC (29.2 V at 13.7 A) | Limited to less severe transients; not AEC-Q101 qualified | Select when cost priority outweighs automotive qualification and higher surge immunity |
| SMCJ18A-H | Higher PPPM (1500 W), larger SMC (DO-214AB) package, same VWM/VBR range | Requires PCB area increase; suited for industrial 48 V systems with higher energy threats | Select when system-level surge testing exceeds ISO 7637-2 Pulse 5a requirements |
Compared with SMAJ18A-E3/52 and SMCJ18A-H, the SM6T18AHM3_A/H uniquely balances AEC-Q101 qualification, 600 W capability, and SMB footprint-making it optimal for space-constrained automotive modules where both reliability and board density matter.
Availability
SM6T18AHM3_A/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input stages, sensor interface circuits, and consumer appliance motor control requiring stable component supply and long-term lifecycle support.
Supply support for SM6T18AHM3_A/H 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 General Semiconductor designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices for high-reliability applications.
The SM6T Series was developed specifically for surface-mount transient suppression in automotive, industrial, and computing systems requiring AEC-Q101 qualification, low-profile packaging, and repeatable clamping performance.
FAQ
What is the clamping voltage of the SM6T18AHM3_A/H at its rated peak pulse current?
The SM6T18AHM3_A/H has a maximum clamping voltage (VC) of 25.2 V at 24.0 A peak pulse current with a 10/1000 μs waveform. This value is measured under standardized test conditions per JEDEC standards and reflects the actual voltage seen by protected circuitry during surge events. The SM6T18AHM3_A/H maintains this clamping performance across its qualified temperature range and after multiple surge cycles.
Is the SM6T18AHM3_A/H suitable for automotive applications?
Yes, the SM6T18AHM3_A/H is AEC-Q101 qualified, as confirmed by its HM3 suffix and Vishay documentation. It meets automotive stress test requirements including temperature cycling, highly accelerated life testing, and ESD immunity. The SM6T18AHM3_A/H is explicitly recommended for use in engine control units, body control modules, and sensor interfaces where reliability under harsh environmental conditions is mandatory.
What does the "HM3" suffix indicate in SM6T18AHM3_A/H?
The "HM3" suffix in SM6T18AHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from commercial-grade M3 (halogen-free, no AEC-Q101) and E3 (RoHS, no halogen-free or AEC-Q101) versions. The SM6T18AHM3_A/H is intended for automotive and high-reliability industrial deployments where material compliance and qualification status are contractually required.
How does the SM6T18AHM3_A/H compare to bidirectional TVS diodes like SM6T18CA?
The SM6T18AHM3_A/H is unidirectional and designed for DC-biased lines where polarity is fixed, such as 12 V supply rails or sensor outputs referenced to ground. In contrast, SM6T18CA is bidirectional and used on AC-coupled or floating lines like data buses. The SM6T18AHM3_A/H offers lower leakage and tighter VBR tolerance than its bidirectional counterpart, making it preferable for precision voltage-clamping applications.
What PCB pad layout is recommended for optimal thermal performance of the SM6T18AHM3_A/H?
Vishay specifies a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad area per terminal for the SM6T18AHM3_A/H to achieve its rated 100 °C/W thermal resistance. The mounting pad layout must follow the dimensions shown in the DO-214AA outline drawing, with cathode and anode pads thermally isolated from other traces except intentional thermal relief connections. Deviation reduces surge handling capability and accelerates thermal aging of the SM6T18AHM3_A/H.
SM6T18AHM3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.2V
- Current - Peak Pulse (10/1000µs):
- 24A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SM6T18AHM3_A/H FAQ
1.How can I place an order for SM6T18AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18AHM3_A/H 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 SM6T18AHM3_A/H reliable?
The price and inventory of SM6T18AHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T18AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SM6T18AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18AHM3_A/H?
SM6T18AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18AHM3_A/H 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 SM6T18AHM3_A/H?
For technical support, including SM6T18AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18AHM3_A/H requirements.
6.How does Aetrix verify that SM6T18AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SM6T18AHM3_A/H 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 SM6T18AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SM6T18AHM3_A/H?
All SM6T18AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18AHM3_A/H, 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 SM6T18AHM3_A/H part is unused and in its original packaging.
Return procedure for SM6T18AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T18AHM3_A/H Tags
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