My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SM15T18AHE3_A/I
- Part No.:
- SM15T18AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T18AHE3_A/I.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,375
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SM15T18AHE3_A/I 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 clamping voltage (VC) at 59.5 A peak pulse current - used to protect automotive sensor signal lines, industrial I/O ports, and power supply rails against lightning-induced and switching transients.
For engineers reviewing the SM15T18AHE3_A/I datasheet, SM15T18AHE3_A/I pinout, SM15T18AHE3_A/I application, or SM15T18AHE3_A/I equivalent, key selection criteria include verified AEC-Q101 qualification, unidirectional polarity with cathode band marking, low-inductance SMC package layout compatibility, and clamping performance under 10/1000 μs surge conditions per IEC 61000-4-5.
Technical Context
This TVS diode operates as a voltage-clamped overvoltage protection device, triggered when reverse voltage exceeds its 17.1–18.9 V breakdown range. Its failure mode is short-circuit under overstress, ensuring system-level fault containment.
Designed for high-energy transient suppression, it delivers 25.2 V clamping at 59.5 A (10/1000 μs), with thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), enabling reliable operation up to 150 °C junction temperature in PCB-mounted configurations with 8.0 mm × 8.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15.3 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe signal line bias margin. |
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - precise breakdown threshold ensures predictable turn-on during transients. |
| VC @ IPPM | 25.2 V at 59.5 A (10/1000 μs) - clamping voltage limits downstream IC stress during surge events. |
| PPPM | 1500 W - peak pulse power rating determines survivability against lightning-induced surges (IEC 61000-4-5 Level 4). |
| TJ max. | +150 °C - maximum junction temperature enables use in under-hood automotive environments. |
| AEC-Q101 | Qualified - confirms reliability for automotive electronics per stress-test requirements including HTOL, TC, and HTRB. |
| Package | SMC (DO-214AB) - standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height for automated placement. |
Pinout & Package
SMC (DO-214AB) package with two terminals: anode and cathode. Cathode identified by molded band on 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 |
|---|---|---|
| Cathode (banded end) | Reverse-biased terminal during normal operation | Connects to protected line; conducts during overvoltage to clamp to VC and shunt surge current to ground. |
| Anode | Reference/ground return path | Typically tied to system ground or low-impedance return plane; completes current path during transient clamping. |
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 in standard PCB layouts. |
| AEC-Q101 qualified | Validates long-term reliability for automotive applications including engine control units and ADAS sensor interfaces. |
| Low clamping ratio (VC/VBR ≈ 1.43) | Minimizes overvoltage stress on downstream MOSFETs, microcontrollers, and analog front-ends during fast transients. |
| MSL Level 1 (260 °C peak) | Supports lead-free reflow assembly without moisture sensitivity concerns or pre-bake requirements. |
| Glass passivated junction | Ensures stable VBR and low leakage across temperature and lifetime, critical for safety-critical systems. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load-dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and chassis ground to clamp transients before reaching sensitive interface ICs. Use Value: Maintains signal integrity below 25.2 V during 59.5 A surges, preventing latch-up or damage to 3.3 V/5 V sensor signal chains. |
Use Scenario: Shielding digital input modules in programmable logic controllers from field-wiring induced surges caused by relay coil de-energization or motor contactor switching. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24 V DC input lines, absorbing >1 kV transients while maintaining <1 μA leakage at nominal voltage. Use Value: Eliminates false triggering and extends service life of optocouplers and level-shifting circuitry in harsh factory environments. |
| Power Supply Rail Protection | Telecom Line Interface Protection |
Use Scenario: Safeguarding 12 V/24 V DC-DC converter inputs in battery-powered equipment against ISO 7637-2 Pulse 1/2a/5a transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power rail, coordinated with upstream fuses and downstream LDOs. Use Value: Limits rail overshoot to 25.2 V during 10/1000 μs pulses, preserving regulator stability and preventing capacitor overvoltage failure. |
Use Scenario: Front-end protection for Ethernet PHYs and RS-485 transceivers connected to external cabling exposed to ESD and lightning coupling. IC Role / Device Role / Timing Role: First-stage TVS on differential pairs, suppressing common-mode surges before signal conditioning circuits. Use Value: Achieves <100 ps response time and 25.2 V clamping to prevent PHY latch-up and maintain link integrity per IEEE 802.3 standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/57T | Lower peak pulse power (400 W), same VWM (15.3 V), SMA package (smaller footprint, higher RθJA = 110 °C/W) | Not AEC-Q101 qualified; suitable only for commercial-grade consumer or office equipment. | Select when cost and board space are prioritized over automotive reliability and surge energy handling. |
| SMCJ18AHE3_A/I | Same AEC-Q101 qualification and SMC package, but 1500 W rating with higher VBR (19.0–21.0 V) and VC (29.2 V at 51.4 A) | Higher clamping voltage reduces margin for 3.3 V/5 V ICs; better suited for 24 V systems with wider tolerance. | Choose when system-level testing shows 29.2 V clamping remains within downstream IC absolute maximum ratings. |
Compared with SMAJ18A-E3/57T and SMCJ18AHE3_A/I, SM15T18AHE3_A/I provides optimal balance of AEC-Q101 compliance, 25.2 V clamping headroom for low-voltage ICs, and proven 1500 W surge capability in the industry-standard SMC outline - making it preferred for automotive and industrial signal-line protection where both reliability and precise voltage limiting are required.
Availability
SM15T18AHE3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply across extended production lifecycles.
Supply support for SM15T18AHE3_A/I 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 global manufacturing and quality systems certified to ISO/TS 16949 and IATF 16949.
The SM15T Series was developed specifically for high-energy transient suppression in automotive and industrial environments, emphasizing AEC-Q101 qualification, low clamping voltage, and robust SMC packaging for automated assembly.
FAQ
What is the clamping voltage of SM15T18AHE3_A/I at its rated peak pulse current?
The SM15T18AHE3_A/I has a maximum clamping voltage (VC) of 25.2 V at 59.5 A peak pulse current with a 10/1000 μs waveform. This value is measured under standardized test conditions per JEDEC and IEC 61000-4-5, and defines the upper voltage limit imposed on protected circuits during surge events. The SM15T18AHE3_A/I maintains this clamping performance across its full operating temperature range.
Is SM15T18AHE3_A/I qualified for automotive applications?
Yes, SM15T18AHE3_A/I is AEC-Q101 qualified, as confirmed by Vishay's official documentation and ordering code suffix "HE3". This qualification covers stress tests including high-temperature operating life, temperature cycling, and highly accelerated life testing - validating its suitability for under-hood and cabin electronics. The SM15T18AHE3_A/I meets automotive reliability requirements without derating in standard mounting conditions.
What does the "HE3" suffix indicate in SM15T18AHE3_A/I?
The "HE3" suffix in SM15T18AHE3_A/I denotes RoHS-compliant construction and AEC-Q101 qualification. It distinguishes this variant from commercial-grade versions (E3) and halogen-free variants (HM3). The "A/I" portion specifies tape-and-reel packaging in 13-inch diameter reels with 3500 units per reel. The SM15T18AHE3_A/I is therefore a fully automotive-qualified, lead-free, surface-mount TVS diode ready for high-volume automated assembly.
How does SM15T18AHE3_A/I differ from bidirectional TVS diodes like SM15T18CA?
SM15T18AHE3_A/I is unidirectional and features a cathode band for polarity identification, while SM15T18CA is bidirectional with no polarity marking and symmetrical breakdown in both directions. The SM15T18AHE3_A/I is intended for DC-biased lines (e.g., power rails or single-ended signals), whereas SM15T18CA suits AC-coupled or differential lines. Their electrical parameters (VWM, VBR, VC) are otherwise matched per datasheet tables.
What is the thermal resistance of SM15T18AHE3_A/I, and how does it affect PCB layout?
The SM15T18AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal, and 15 °C/W junction-to-lead (RθJL). To achieve rated power dissipation, PCB layout must provide minimum recommended pad area and avoid thermal isolation. Reducing copper area increases RθJA, lowering allowable surge repetition rate - a key design constraint for the SM15T18AHE3_A/I in thermally constrained enclosures.
SM15T18AHE3_A/I 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:
- Active
- 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_A/I FAQ
1.How can I place an order for SM15T18AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T18AHE3_A/I 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_A/I reliable?
The price and inventory of SM15T18AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T18AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SM15T18AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T18AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T18AHE3_A/I?
SM15T18AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T18AHE3_A/I 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_A/I?
For technical support, including SM15T18AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T18AHE3_A/I requirements.
6.How does Aetrix verify that SM15T18AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SM15T18AHE3_A/I 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_A/I meets industry standards.
7.What is the process for return or replacement of SM15T18AHE3_A/I?
All SM15T18AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM15T18AHE3_A/I, 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_A/I part is unused and in its original packaging.
Return procedure for SM15T18AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T18AHE3_A/I 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 …
