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Vishay General Semiconductor - Diodes Division SM6T18AHE3/52
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- Part No.:
- SM6T18AHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18AHE3/52.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,948
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Product details
Overview
SM6T18AHE3/52 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping ESD and surge transients on power/signal lines. It features 18 V breakdown voltage (VBR = 17.1–18.9 V at 1.0 mA), 15.3 V stand-off voltage (VWM), 25.2 V max clamping voltage (VC) at 24.0 A peak pulse current, and 600 W peak pulse power (10/1000 μs). It is AEC-Q101 qualified and used to protect automotive sensor signal lines and MCU I/O ports.
For engineers reviewing the SM6T18AHE3/52 datasheet, SM6T18AHE3/52 pinout, SM6T18AHE3/52 application, or SM6T18AHE3/52 equivalent, key selection criteria include unidirectional polarity, 15.3 V working voltage compatibility with 12 V automotive systems, clamping performance under 24 A surge, AEC-Q101 qualification status, and SMB package thermal resistance (RθJA = 100 °C/W).
Technical Context
The SM6T18AHE3/52 operates as a silicon avalanche diode that enters breakdown when reverse voltage exceeds its VBR threshold, diverting transient energy to ground while limiting downstream voltage to ≤25.2 V. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and robust surge handling up to 100 A IFSM (10 ms half-sine).
Designed for surface-mount automated assembly, it meets J-STD-020 MSL Level 1 (260 °C peak reflow), uses matte tin-plated leads, and achieves low inductance via SMB package geometry-critical for sub-microsecond transient response in automotive CAN/LIN bus protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V at 1.0 mA - defines precise avalanche onset for predictable clamping behavior |
| VWM | 15.3 V - maximum continuous reverse voltage before leakage exceeds 1.0 μA; matches 12 V system rail 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 - peak transient power dissipation capability per standard waveform |
| TJ max | +150 °C - enables operation in under-hood automotive environments |
| RθJA | 100 °C/W - thermal resistance from junction to ambient; requires minimum 5.0 mm × 5.0 mm copper pads for rated power |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional polarity marked by cathode band. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); weight 0.106 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to protected line in clamping configuration | Low-impedance path for surge current when device is reverse-biased and conducting |
| Cathode | Current exit terminal in forward bias; marked by band; connected to ground or low-impedance return | Defines unidirectional polarity-must be tied to reference plane to enable clamping action |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Ensures stable VBR tolerance and low leakage (<1.0 μA) over temperature and lifetime |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock |
| 600 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 surge events without degradation |
| MSL Level 1 moisture sensitivity | Enables direct placement without baking; compatible with standard SMT reflow profiles up to 260 °C peak |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control modules exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between sensor output and MCU ADC input, referenced to chassis ground. Use Value: Limits transient voltage to ≤25.2 V, preventing ADC saturation and protecting internal ESD structures of automotive-grade microcontrollers. | Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers interfacing with industrial solenoids and relays. IC Role / Device Role / Timing Role: Standoff protection device mounted at connector entry point, shunting surges before reaching optocoupler input stage. Use Value: Withstands repeated 600 W transients without parameter shift, maintaining long-term reliability in factory-floor EMI environments. |
| Automotive Body Control Module (BCM) | Consumer Appliance Motor Drive Protection |
Use Scenario: Clamping induced spikes on LIN bus lines connecting door modules and lighting controllers. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS placed inline with LIN transceiver RX/TX pins, referenced to vehicle ground. Use Value: Maintains signal integrity with <10 pF junction capacitance at zero bias, enabling error-free communication up to 20 kbps. | Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Power-rail TVS across motor supply terminals, absorbing back-EMF during MOSFET turn-off. Use Value: Handles 100 A non-repetitive forward surge (IFSM), preventing latch-up in motor driver ICs during 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 SMB package, 18 V VBR, but lower PPPM = 400 W and higher VC = 29.2 V at 13.7 A | Not AEC-Q101 qualified; suited for commercial-grade consumer electronics only | Select when cost sensitivity outweighs automotive qualification and surge margin requirements |
| SMCJ18AHE3/52 | Higher PPPM = 1500 W, same VBR/VWM, but larger SMC (DO-214AB) package (7.11 mm × 6.22 mm) | Requires PCB layout change; better for high-energy transients like ISO 7637-2 Pulse 5a | Select when system-level testing reveals 600 W insufficient and board space allows larger footprint |
Compared with SMAJ18A-E3/52 and SMCJ18AHE3/52, the SM6T18AHE3/52 delivers optimal balance of AEC-Q101 compliance, 600 W surge capacity, and SMB footprint-making it the preferred choice for space-constrained automotive modules where qualification and reliability are mandatory.
Availability
SM6T18AHE3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC inputs, body control modules, and appliance motor drive circuits requiring stable component supply and AEC-Q101 assurance.
Supply support for SM6T18AHE3/52 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, MOSFETs, and protection devices with emphasis on reliability, precision, and automotive-grade qualification.
The SM6T Series is engineered specifically for robust transient suppression in harsh environments-targeting automotive, industrial, and transportation systems where failure due to voltage surges must be eliminated.
FAQ
What is the polarity configuration of the SM6T18AHE3/52?
The SM6T18AHE3/52 is a unidirectional transient voltage suppressor diode. Its cathode is marked by a visible band on the SMB package body, and it conducts only when the anode is more negative than the cathode-making it suitable for DC rail protection where polarity is fixed. This differs from bidirectional variants (e.g., SM6T18CA) which suppress surges regardless of polarity.
Is the SM6T18AHE3/52 qualified for automotive use?
Yes, the SM6T18AHE3/52 is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation (Document Number 88385, Revision 09-Jan-2024). This qualification covers stress tests including temperature cycling, high-temperature operating life, and mechanical shock-ensuring suitability for under-hood and cabin-mounted automotive electronics.
What is the maximum clamping voltage of the SM6T18AHE3/52 under surge conditions?
The SM6T18AHE3/52 has a maximum clamping voltage (VC) of 25.2 V when subjected to a 10/1000 μs waveform peak pulse current of 24.0 A. This value is measured per JEDEC standards and guarantees that downstream components see no more than 25.2 V during such transients-critical for protecting 3.3 V or 5 V logic interfaces powered from a 12 V rail.
Does the SM6T18AHE3/52 require special PCB layout considerations?
Yes-the SM6T18AHE3/52 requires minimum 5.0 mm × 5.0 mm copper pads per terminal to achieve its rated 600 W peak pulse power and thermal resistance (RθJA = 100 °C/W). Smaller pads reduce surge capability and increase junction temperature. The SMB footprint also mandates strict adherence to Vishay's recommended mounting pad layout to ensure solder joint reliability and MSL Level 1 compliance.
How does the SM6T18AHE3/52 compare to the SMAJ18A-E3/52 in terms of surge handling?
The SM6T18AHE3/52 offers superior surge handling versus the SMAJ18A-E3/52: it delivers 600 W peak pulse power (vs. 400 W) and clamps at 25.2 V (vs. 29.2 V) under identical 10/1000 μs conditions. This 200 W margin and 4.0 V lower clamping voltage directly improve system robustness in automotive load-dump scenarios where voltage overshoot must be minimized.
SM6T18AHE3/52 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:
- 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):
- 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 (SMBJ)
SM6T18AHE3/52 FAQ
1.How can I place an order for SM6T18AHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18AHE3/52 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 SM6T18AHE3/52 reliable?
The price and inventory of SM6T18AHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T18AHE3/52 is usually 5 days.
3.What payment methods are accepted for SM6T18AHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18AHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18AHE3/52?
SM6T18AHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18AHE3/52 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 SM6T18AHE3/52?
For technical support, including SM6T18AHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18AHE3/52 requirements.
6.How does Aetrix verify that SM6T18AHE3/52 is sourced from the original manufacturer or authorized distributors?
All SM6T18AHE3/52 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 SM6T18AHE3/52 meets industry standards.
7.What is the process for return or replacement of SM6T18AHE3/52?
All SM6T18AHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18AHE3/52, 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 SM6T18AHE3/52 part is unused and in its original packaging.
Return procedure for SM6T18AHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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