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Vishay General Semiconductor - Diodes Division SM15T18AHM3/H
- Part No.:
- SM15T18AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T18AHM3/H.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,090
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Product details
Overview
SM15T18AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 15.3 V stand-off voltage (VWM), 17.1–18.9 V breakdown voltage (VBR at 1 mA), and 25.2 V maximum clamping voltage (VC at IPPM). It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power electronics against lightning-induced and switching transients.
For engineers reviewing the SM15T18AHM3/H datasheet, SM15T18AHM3/H pinout, SM15T18AHM3/H application, or SM15T18AHM3/H equivalent, key selection criteria include clamping voltage margin relative to protected device's absolute maximum rating, unidirectional polarity alignment with DC bias, thermal resistance (RθJA = 75 °C/W), and AEC-Q101 qualification status confirmed by HM3 suffix.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents <1 μA reverse leakage at 15.3 V; during transient events exceeding 17.1 V, it avalanches to clamp voltage ≤25.2 V at up to 59.5 A peak pulse current (IPPM). Its glass-passivated junction ensures stable breakdown and low inductance for fast response.
The SMC package enables automated placement and meets MSL level 1 (260 °C reflow peak); the HM3 suffix confirms halogen-free, RoHS-compliant, and AEC-Q101 qualified construction - critical for automotive ECUs and industrial controllers requiring long-term reliability under thermal cycling and humidity stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 15.3 V - Maximum continuous reverse voltage before significant leakage; sets upper limit for safe DC operating range. |
| VBR (Breakdown Voltage) | 17.1–18.9 V at 1 mA - Confirmed avalanche initiation window; ensures reliable turn-on before protected circuit exceeds its max rating. |
| VC (Clamping Voltage) | 25.2 V at IPPM - Peak voltage seen by downstream device during 10/1000 μs transient; defines worst-case stress on IC/MOSFET. |
| PPPM (Peak Pulse Power) | 1500 W - Sustains high-energy surges (e.g., ISO 7637-2 Pulse 1/2a/5a) without failure; validated per Fig. 1 derating curve. |
| IPPM (Peak Pulse Current) | 59.5 A - Maximum surge current handled at 10/1000 μs; determines minimum system source impedance required for safe operation. |
| TJ max / RθJA | 150 °C / 75 °C/W - Junction temperature limit and thermal resistance define power dissipation limits in real PCB layouts with 8 mm × 8 mm copper pads. |
| AEC-Q101 Qualified | Yes - Validated for automotive applications per HM3 suffix; includes temperature cycling, HTRB, and ESD testing per AEC standard. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, matte tin-plated leads. Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line (e.g., 12 V rail or signal trace); conducts avalanche current to ground during overvoltage event. |
| Anode (unbanded end) | Reference/return path | Typically tied to system ground or low-impedance return plane; completes shunt path for transient energy dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Withstands automotive load-dump and lightning-surge threats per ISO 7637-2 and IEC 61000-4-5 without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.44) | Minimizes overvoltage stress on downstream silicon; enables protection of 24 V-rated components with margin. |
| Glass-passivated junction | Ensures stable VBR over lifetime and temperature; eliminates parameter drift due to moisture or contamination. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles; no pre-baking required prior to assembly. |
| AEC-Q101 qualified (HM3) | Validated for under-hood automotive use including engine control, body electronics, and ADAS power domains. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Digital Input Module |
|---|---|
Use Scenario: Protects microcontroller I/O pins and CAN transceiver power rails from load-dump transients during alternator regulation faults. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between 12 V supply and chassis ground, triggered within nanoseconds of overvoltage onset. Use Value: Clamps to ≤25.2 V, preventing latch-up or gate oxide damage in 3.3 V/5 V logic and 24 V-tolerant CAN PHYs. |
Use Scenario: Shields 24 V digital input optocoupler front-end from inductive kickback when solenoid valves switch off. IC Role / Device Role / Timing Role: Standoff-rated TVS across input terminals, conducting only during >17.1 V transients while remaining invisible during normal 20–30 V operation. Use Value: Enables robust 24 V input stage design without external series resistors or RC snubbers, reducing BOM count and board space. |
| Telecom Power Supply Front-End | Consumer Appliance Motor Drive Board |
Use Scenario: Guards AC/DC converter primary-side controller ICs against surge coupling via mains input during lightning events. IC Role / Device Role / Timing Role: Primary-side TVS connected between rectified DC bus and ground, absorbing 1500 W pulses per IEC 61000-4-5 Level 4. Use Value: Eliminates need for bulkier MOV-based solutions; maintains compact SMC footprint while meeting telecom safety standards. |
Use Scenario: Safeguards gate drivers and MCU GPIOs from back-EMF spikes generated by brushed DC motors in washing machines or HVAC blowers. IC Role / Device Role / Timing Role: Localized TVS mounted adjacent to motor driver IC, minimizing loop inductance to ensure sub-10 ns response. Use Value: Prevents false resets and gate driver latch-up, improving field reliability without adding ferrite beads or extra filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/57T | Same VWM (15.4 V), lower PPPM (400 W), SMA package (higher RθJA = 110 °C/W), commercial grade only. | Limited to low-energy transients (e.g., ESD-only); unsuitable for ISO 7637-2 Pulse 5a or lightning surges. | Select only for cost-sensitive consumer designs where 1500 W capability is unnecessary and AEC-Q101 is not required. |
| SMCJ18A-QH | Same SMC package and 1500 W rating, but VWM = 15.0 V, VC = 27.7 V, and AEC-Q101 qualified via QH suffix (not HM3). | Higher clamping voltage reduces margin for 24 V systems; QH qualification differs in test scope from HM3 (e.g., no HAST). | Acceptable for non-critical automotive modules if layout allows higher VC; verify qualification report matches program requirements. |
Compared with SMAJ18A-E3/57T and SMCJ18A-QH, SM15T18AHM3/H delivers tighter clamping (25.2 V vs. 27.7 V), lower thermal resistance (75 vs. ≥85 °C/W), and full HM3-grade AEC-Q101 compliance - making it optimal for high-reliability 12 V/24 V automotive and industrial power nodes.
Availability
SM15T18AHM3/H is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC input stages, telecom power front-ends, and appliance motor drive boards requiring stable component supply with guaranteed long-term availability.
Supply support for SM15T18AHM3/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 is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SM15T Series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure modes must be predictable (short-circuit) and qualification rigor is non-negotiable.
FAQ
What is the clamping voltage of SM15T18AHM3/H at its rated peak pulse current?
The SM15T18AHM3/H has a maximum clamping voltage (VC) of 25.2 V when subjected to its peak pulse current (IPPM) of 59.5 A under the standard 10/1000 μs waveform. This value is measured with the device mounted on 8.0 mm × 8.0 mm copper pads per JEDEC guidelines and defines the upper voltage stress imposed on protected circuitry during surge events.
Is SM15T18AHM3/H suitable for bidirectional transient protection?
No, SM15T18AHM3/H is a unidirectional TVS diode - its cathode band indicates polarity, and it conducts only in reverse breakdown. For bidirectional protection, Vishay specifies the CA-suffix variant (e.g., SM15T18CAHM3/H); using SM15T18AHM3/H on AC or floating lines risks forward conduction and failure.
Does SM15T18AHM3/H meet AEC-Q101 requirements for automotive use?
Yes, the HM3 suffix in SM15T18AHM3/H explicitly denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction. Testing includes temperature cycling, high-temperature reverse bias (HTRB), and ESD per AEC-Q101 Rev D, validating suitability for under-hood automotive applications such as engine control and body electronics.
What is the thermal resistance of SM15T18AHM3/H, and how does it affect PCB layout?
SM15T18AHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads. To maintain TJ ≤150 °C under 6.5 W steady-state dissipation, designers must provide adequate copper area and avoid thermal isolation - smaller pads increase RθJA and risk thermal runaway during repetitive surges.
How does the glass passivation in SM15T18AHM3/H improve long-term reliability?
The glass-passivated chip junction in SM15T18AHM3/H prevents moisture ingress and metallic ion migration at the PN interface, ensuring stable breakdown voltage (VBR) and low leakage (<1 μA at VWM) over 15+ years of operation in humid or thermally cycled environments - a key requirement for automotive and industrial deployments where field failures are unacceptable.
SM15T18AHM3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- SM15T, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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):
- 59.5A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMC)
SM15T18AHM3/H FAQ
1.How can I place an order for SM15T18AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T18AHM3/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 SM15T18AHM3/H reliable?
The price and inventory of SM15T18AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T18AHM3/H is usually 5 days.
3.What payment methods are accepted for SM15T18AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T18AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T18AHM3/H?
SM15T18AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T18AHM3/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 SM15T18AHM3/H?
For technical support, including SM15T18AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T18AHM3/H requirements.
6.How does Aetrix verify that SM15T18AHM3/H is sourced from the original manufacturer or authorized distributors?
All SM15T18AHM3/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 SM15T18AHM3/H meets industry standards.
7.What is the process for return or replacement of SM15T18AHM3/H?
All SM15T18AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SM15T18AHM3/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 SM15T18AHM3/H part is unused and in its original packaging.
Return procedure for SM15T18AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T18AHM3/H Tags
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