My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SM6T18A-E3/52
;;2.jpg)
- Part No.:
- SM6T18A-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18A-E3/52.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,579
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SM6T18A-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, featuring 18 V breakdown voltage (VBR = 17.1–18.9 V at 1.0 mA), 15.3 V stand-off voltage (VWM), and 600 W peak pulse power (10/1000 μs). It clamps transients to ≤25.2 V at 24.0 A peak pulse current and is rated for -65 °C to +150 °C operation - deployed for protecting MOSFETs and ICs against inductive switching surges in automotive power supplies.
For engineers reviewing the SM6T18A-E3/52 datasheet, SM6T18A-E3/52 pinout, SM6T18A-E3/52 application, or SM6T18A-E3/52 equivalent, key selection criteria include verified unidirectional polarity, SMB package thermal resistance (RθJA = 100 °C/W), clamping voltage under 25.2 V at 24 A, AEC-Q101 qualification status, and RoHS-compliant matte tin terminations per J-STD-002.
Technical Context
This TVS diode operates as a fast-acting, low-inductance overvoltage clamp with glass-passivated junction and bidirectional-capable architecture (though SM6T18A-E3/52 is unidirectional, marked with cathode band). Its 10/1000 μs waveform response enables robust protection against ESD and load dump events without sacrificing signal integrity on sensitive lines.
The device delivers 600 W peak pulse power while maintaining low leakage (<1.0 μA at 15.3 V) and exhibits stable thermal performance with RθJL = 20 °C/W to lead and MSL Level 1 moisture sensitivity - critical for reflow-compatible automated assembly in automotive and industrial PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V at 1.0 mA - defines precise breakdown threshold for reliable overvoltage triggering |
| VWM | 15.3 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 μA |
| VC @ IPPM | 25.2 V at 24.0 A (10/1000 μs) - clamping voltage limiting downstream component stress |
| PPPM | 600 W - surge energy handling capacity for transient suppression in automotive load-dump scenarios |
| TJ max. | +150 °C - enables operation in under-hood environments without derating below ambient |
| RθJA | 100 °C/W - thermal resistance defining junction-to-ambient temperature rise under 5.0 W steady-state dissipation |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002; meets UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential rail in unidirectional clamp configuration |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to protected line (e.g., 12 V rail); conducts during overvoltage to shunt surge to ground |
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 automotive systems |
| Glass passivated chip junction | Ensures long-term reliability and stable VBR under thermal cycling and humidity exposure |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without pre-baking or special handling |
| AEC-Q101 qualified option available | RoHS-compliant HE3/HM3 variants meet automotive-grade stress testing requirements |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppressing load dump transients on 12 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and DC-DC input, triggered within nanoseconds of overvoltage onset. Use Value: Limits voltage to ≤25.2 V during 600 W surges, preventing damage to upstream regulators and microcontrollers. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS connected between signal line and ground, leveraging <1.0 μA leakage at 15.3 V to avoid signal distortion. Use Value: Maintains signal fidelity while clamping 8/20 μs ESD pulses to ≤32.5 V at 123 A, per IEC 61000-4-2 Level 4. |
| Consumer Power Adapter Input Protection | MOSFET Gate Driver Surge Suppression |
Use Scenario: Safeguarding AC-DC adapter primary-side rectifiers and controllers from lightning-induced surges. IC Role / Device Role / Timing Role: Mounted across bulk capacitor input, absorbing repetitive 10/1000 μs transients up to 600 W without degradation. Use Value: Extends adapter lifetime by preventing overvoltage failure of bridge rectifiers and PWM controllers during mains disturbances. | Use Scenario: Protecting high-side N-channel MOSFET gate drivers from shoot-through-inducing voltage spikes. IC Role / Device Role / Timing Role: Placed between gate and source, clamping Miller-induced overshoot during fast switching transitions. Use Value: Prevents unintended turn-on by limiting gate voltage excursions to ≤25.2 V, preserving driver IC integrity and switching timing accuracy. |
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 | Same SMB package, 18 V VBR, but 400 W PPPM (vs. 600 W); higher VC = 29.2 V at 13.7 A | Limited to lower-energy transients; unsuitable for automotive load dump per ISO 7637-2 | Select only when surge energy is constrained and clamping voltage margin permits higher VC |
| 1.5SMC18A | Higher-power SMC package (1500 W), same VBR/VWM, but larger footprint (7.11 × 6.22 mm vs. SMB's 4.57 × 3.94 mm) | Requires PCB layout change; used where sustained surge duty cycle demands greater thermal mass | Choose when system-level surge testing exceeds 600 W or board space allows larger package |
Compared with SMAJ18A and 1.5SMC18A, SM6T18A-E3/52 uniquely balances 600 W surge capability, SMB footprint compatibility, and 25.2 V clamping in commercial-grade RoHS-compliant construction - making it optimal for space-constrained automotive and industrial designs requiring validated transient immunity without layout revision.
Availability
SM6T18A-E3/52 is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interface protection, consumer power adapter input stages, and MOSFET gate driver circuits requiring stable component supply and consistent surge performance across production batches.
Supply support for SM6T18A-E3/52 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, efficiency, and application-specific optimization.
The SM6T Series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where compact size, repeatable clamping, and AEC-Q101 qualification are mandatory design requirements.
FAQ
What is the breakdown voltage tolerance of SM6T18A-E3/52?
The SM6T18A-E3/52 has a specified breakdown voltage range of 17.1 V to 18.9 V at 1.0 mA test current, representing ±5.6% tolerance around the nominal 18 V rating. This tight VBR window ensures predictable triggering behavior in precision overvoltage protection circuits and is verified per Vishay Document Number 88385, Revision 09-Jan-2024.
Is SM6T18A-E3/52 RoHS-compliant and halogen-free?
Yes, SM6T18A-E3/52 carries the "E3" suffix, indicating RoHS-compliance per EU Directive 2011/65/EU and exemption 7a. It is not halogen-free; for halogen-free compliance, the "M3" variant (e.g., SM6T18A-M3/52) must be selected. Both meet JESD 201 Class 2 whisker resistance and UL 94 V-0 flammability standards.
What is the maximum clamping voltage of SM6T18A-E3/52 under a 10/1000 μs surge?
The SM6T18A-E3/52 clamps to a maximum of 25.2 V when subjected to its rated peak pulse current of 24.0 A under the standardized 10/1000 μs waveform. This value is measured per Figure 1 and Table on page 2 of Vishay Document Number 88385 and defines the upper voltage limit imposed on protected circuitry during surge events.
Does SM6T18A-E3/52 have AEC-Q101 qualification?
No, SM6T18A-E3/52 is the commercial-grade version. AEC-Q101 qualification is available only in variants with "HE3" or "HM3" suffixes (e.g., SM6T18AHE3_B/H). These automotive-grade versions undergo additional stress testing including temperature cycling, HTRB, and ESD per AEC-Q101 Rev D, while retaining identical electrical specs and SMB packaging.
What is the thermal resistance from junction to ambient for SM6T18A-E3/52?
The SM6T18A-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as defined in Vishay Document Number 88385. This value governs steady-state temperature rise under DC power dissipation and informs layout decisions for thermal management in high-reliability applications.
SM6T18A-E3/52 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:
- 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):
- 24A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SM6T18A-E3/52 FAQ
1.How can I place an order for SM6T18A-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18A-E3/52 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 SM6T18A-E3/52 reliable?
The price and inventory of SM6T18A-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T18A-E3/52 is usually 5 days.
3.What payment methods are accepted for SM6T18A-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18A-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18A-E3/52?
SM6T18A-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18A-E3/52 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 SM6T18A-E3/52?
For technical support, including SM6T18A-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18A-E3/52 requirements.
6.How does Aetrix verify that SM6T18A-E3/52 is sourced from the original manufacturer or authorized distributors?
All SM6T18A-E3/52 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 SM6T18A-E3/52 meets industry standards.
7.What is the process for return or replacement of SM6T18A-E3/52?
All SM6T18A-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18A-E3/52, 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 SM6T18A-E3/52 part is unused and in its original packaging.
Return procedure for SM6T18A-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T18A-E3/52 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 …
