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Vishay General Semiconductor - Diodes Division SM15T18AHE3/57T
- Part No.:
- SM15T18AHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T18AHE3/57T.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,487
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Product details
Overview
SM15T18AHE3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, with 15.3 V stand-off voltage (VWM), 17.1–18.9 V breakdown voltage (VBR), and 1500 W peak pulse power (10/1000 μs). It clamps transients to ≤25.2 V at 59.5 A IPPM and is AEC-Q101 qualified for automotive electronics protection.
For engineers reviewing the SM15T18AHE3/57T datasheet, SM15T18AHE3/57T pinout, SM15T18AHE3/57T application, or SM15T18AHE3/57T equivalent, key selection criteria include clamping voltage under 25.2 V at 59.5 A, unidirectional polarity with cathode band marking, AEC-Q101 qualification, and compatibility with 8.0 mm × 8.0 mm copper pad layout per JEDEC standard.
Technical Context
This TVS diode operates as a fast-acting shunt protector, triggering when reverse voltage exceeds VBR (17.1–18.9 V) and clamping to ≤25.2 V during 10/1000 μs transients. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and low dynamic impedance.
Designed for high-energy threat suppression, it handles 200 A non-repetitive forward surge (10 ms half-sine) and sustains 6.5 W steady-state power dissipation at TA = 50 °C. Thermal resistance is 75 °C/W junction-to-ambient (RθJA) and 15 °C/W junction-to-lead (RθJL), enabling reliable operation up to TJ = +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 15.3 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR (Breakdown Voltage) | 17.1–18.9 V at IT = 1.0 mA - Confirmed avalanche initiation range under DC test current |
| VC (Clamping Voltage) | ≤25.2 V at IPPM = 59.5 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case transient |
| PPPM (Peak Pulse Power) | 1500 W - Energy-handling capacity for lightning-induced or inductive-switching surges |
| ID (Reverse Leakage) | ≤1.0 μA at VWM - Minimal standby current ensuring low power loss in always-on systems |
| TJ max. | +150 °C - Maximum junction temperature supporting automotive under-hood deployment |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 0.305" × 0.320" footprint and matte tin leads |
Pinout & Package
SM15T18AHE3/57T uses the SMC (DO-214AB) package: molded plastic case with two coplanar leads, cathode identified by a visible band on the body. Leads are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or return path; defines current flow direction during clamping |
| Cathode | High-side transient input terminal | Marked with band; accepts transient energy and routes clamped current to ground via anode |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 4 (4 kV) surges without derating on standard PCB pads |
| AEC-Q101 qualification | Validates reliability for automotive powertrain, body control, and ADAS modules requiring zero-failure field performance |
| Glass passivated junction | Ensures stable VBR and low leakage over temperature (-65 °C to +150 °C) and lifetime cycling |
| Low inductance design | Minimizes voltage overshoot during fast-rising transients (e.g., ESD or relay bounce), improving clamping fidelity |
| MSL Level 1 (260 °C peak) | Supports lead-free reflow assembly without preconditioning or special handling requirements |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between power rail and ground, triggered within nanoseconds of overvoltage onset. Use Value: Clamps to ≤25.2 V during 59.5 A surges, preventing damage to downstream PMICs and microcontrollers rated for 28 V absolute max. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) connected to long harnesses in factory automation. IC Role / Device Role / Timing Role: Point-of-entry transient suppressor on signal line, absorbing inductive kickback from nearby solenoids or motors. Use Value: Limits induced voltage to <25.2 V while maintaining <1.0 μA leakage, preserving signal integrity and ADC accuracy in 24-bit systems. |
| Telecom DC Power Input Protection | Consumer USB-C Power Delivery Port |
Use Scenario: Guarding PoE-powered switches and base stations against lightning-induced surges on 48 V DC input lines. IC Role / Device Role / Timing Role: Primary-level TVS on main DC bus, coordinated with upstream fuses and secondary filtering. Use Value: Absorbs 1500 W pulses without failure, with short-circuit failure mode enabling safe fuse coordination and system-level fault isolation. |
Use Scenario: Secondary protection on USB-C VBUS line after primary front-end protection, targeting fast ESD and hot-plug spikes. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF) unidirectional clamp referenced to ground, placed adjacent to connector. Use Value: Responds in <1 ns with ≤25.2 V clamping, preventing latch-up in USB PD controllers while meeting IEC 61000-4-2 ±15 kV air discharge requirements. |
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 | Lower PPPM (400 W), same VWM/VBR range, SMA package (smaller thermal mass) | Not suitable for lightning-level threats; limited to board-level ESD and switching noise | Select only if system-level threat analysis confirms <400 W surge exposure and space constraints prohibit SMC |
| SMCJ18AHE3/57T | Higher PPPM (3000 W), identical VWM/VBR, same SMC package but higher IPPM (122 A) | Overqualified for 1500 W use cases; may increase cost and board area without benefit | Prefer SM15T18AHE3/57T where 1500 W rating matches validated threat profile and AEC-Q101 compliance is required |
Compared with SMAJ18A-E3/57T and SMCJ18AHE3/57T, SM15T18AHE3/57T delivers optimal balance of automotive-grade reliability, 1500 W surge capability, and cost-effective SMC packaging-making it the preferred choice for AEC-Q101-compliant 12 V/24 V systems facing defined lightning or inductive threats.
Availability
SM15T18AHE3/57T is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom DC power inputs requiring stable component supply, AEC-Q101 qualification, and 1500 W transient immunity.
Supply support for SM15T18AHE3/57T 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, with emphasis on high-reliability, industry-qualified components for automotive and industrial markets.
The SM15T Series was developed specifically for high-energy transient suppression in harsh environments, combining AEC-Q101 qualification, 1500 W surge capability, and SMC packaging optimized for automated assembly and thermal performance.
FAQ
What is the clamping voltage of SM15T18AHE3/57T at its rated peak pulse current?
The SM15T18AHE3/57T has a maximum clamping voltage (VC) of 25.2 V when subjected to its rated peak pulse current (IPPM) of 59.5 A using the standardized 10/1000 μs waveform. This value is measured under specified test conditions (TA = 25 °C, mounted on 8.0 mm × 8.0 mm copper pads) and defines the upper voltage limit imposed on protected circuitry during surge events. The SM15T18AHE3/57T maintains this clamping performance across its operational temperature range.
Is SM15T18AHE3/57T suitable for automotive applications?
Yes, SM15T18AHE3/57T is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix. It supports junction temperatures from –65 °C to +150 °C, meets MSL Level 1 reflow requirements (260 °C peak), and features matte tin-plated leads compliant with JESD 201 Class 2 whisker testing. The SM15T18AHE3/57T is commonly deployed in body control modules, infotainment power supplies, and ADAS sensor interfaces where transient immunity and long-term reliability are critical.
How does the unidirectional configuration of SM15T18AHE3/57T affect circuit placement?
The SM15T18AHE3/57T is unidirectional, meaning it conducts only when the cathode is positive relative to the anode. The cathode is marked by a visible band on the device body and must be connected toward the protected line (e.g., 12 V rail), while the anode connects to ground. Reversing polarity prevents clamping action and risks permanent damage. This configuration makes SM15T18AHE3/57T ideal for DC power line protection but unsuitable for AC or bidirectional signal lines without additional circuitry.
What is the thermal resistance of SM15T18AHE3/57T, and how does it impact layout?
The SM15T18AHE3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W. These values assume mounting on the recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. To maintain TJ ≤ 150 °C under 6.5 W steady-state dissipation, designers must ensure adequate copper area and avoid excessive ambient temperature rise. The SM15T18AHE3/57T's RθJL enables effective heat transfer to PCB planes or heatsinks via the leads.
Does SM15T18AHE3/57T have a known failure mode under overstress conditions?
Per Vishay documentation, the SM15T18AHE3/57T fails in a short-circuit mode when subjected to overstress beyond its rated peak pulse power or junction temperature limits. This behavior is intentional and enables system-level fault detection through downstream current monitoring or fuse activation. The short-circuit failure mode allows SM15T18AHE3/57T to remain protective until replaced, unlike open-circuit failures that leave downstream circuitry exposed. Designers should coordinate fuse ratings with the SM15T18AHE3/57T's IFSM (200 A) and IPPM (59.5 A) to ensure safe interruption.
SM15T18AHE3/57T 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 (SMCJ)
SM15T18AHE3/57T FAQ
1.How can I place an order for SM15T18AHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T18AHE3/57T 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 SM15T18AHE3/57T reliable?
The price and inventory of SM15T18AHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T18AHE3/57T is usually 5 days.
3.What payment methods are accepted for SM15T18AHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T18AHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T18AHE3/57T?
SM15T18AHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T18AHE3/57T 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 SM15T18AHE3/57T?
For technical support, including SM15T18AHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T18AHE3/57T requirements.
6.How does Aetrix verify that SM15T18AHE3/57T is sourced from the original manufacturer or authorized distributors?
All SM15T18AHE3/57T 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 SM15T18AHE3/57T meets industry standards.
7.What is the process for return or replacement of SM15T18AHE3/57T?
All SM15T18AHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SM15T18AHE3/57T, 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 SM15T18AHE3/57T part is unused and in its original packaging.
Return procedure for SM15T18AHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T18AHE3/57T Tags
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