My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SM6T18A-M3/5B
;;2.jpg)
- Part No.:
- SM6T18A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18A-M3/5B.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,484
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SM6T18A-M3/5B from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 18 V standoff voltage (VWM = 15.3 V), 25.2 V clamping voltage at 24 A peak pulse current, 600 W peak pulse power (10/1000 μs), and 150 °C max junction temperature. It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients in automotive and industrial power electronics.
For engineers reviewing the SM6T18A-M3/5B datasheet, SM6T18A-M3/5B pinout, SM6T18A-M3/5B application, or SM6T18A-M3/5B equivalent, key selection criteria include clamping voltage margin vs. protected device's absolute maximum rating, IPPM derating above 25 °C, thermal resistance (RθJA = 100 °C/W), unidirectional polarity marking, and halogen-free RoHS compliance per M3 suffix.
Technical Context
The SM6T18A-M3/5B operates as a silicon avalanche diode with glass-passivated junction, designed to clamp transient overvoltages before they damage downstream components. Its low-inductance SMB package and 10/1000 μs waveform-rated 600 W peak pulse power enable fast response to ESD and load-dump events.
It exhibits a breakdown voltage range of 17.1–18.9 V at 1 mA test current, reverse leakage ≤1.0 μA at 15.3 V, and clamps to ≤25.2 V under 24 A transient current. Thermal performance is specified with RθJL = 20 °C/W and RθJA = 100 °C/W on 5.0 mm × 5.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15.3 V - Maximum continuous reverse operating voltage before clamping begins; must exceed system nominal voltage by safety margin |
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - Ensures reliable avalanche initiation within defined tolerance band |
| VC @ IPPM | 25.2 V at 24 A (10/1000 μs) - Clamped voltage seen by protected circuit during worst-case surge |
| PPPM | 600 W - Peak transient energy absorption capability under standardized surge waveform |
| IFSM | 100 A - Single half-sine surge current rating (10 ms), critical for automotive load-dump immunity |
| TJ max | +150 °C - Maximum junction temperature defining thermal design limits and derating curves |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; guides PCB layout cooling requirements |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, M3 suffix. Cathode indicated by band marking on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential rail in unidirectional TVS configuration |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., power rail or signal); band-marked end defines polarity |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against ISO 7637-2 Pulse 1, 2a, and 5a load-dump transients in 12 V automotive systems |
| Glass-passivated chip junction | Ensures stable breakdown characteristics and long-term reliability under repeated surge stress |
| Low inductance SMB package | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time), improving clamping fidelity |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements |
| Halogen-free, RoHS-compliant (M3) | Fulfills environmental compliance mandates for industrial and automotive OEM supply chains |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Suppressing load-dump transients on 12 V battery-fed ECUs in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor, clamping surges up to 35 V. Use Value: Limits voltage seen by downstream DC/DC converters and microcontrollers to ≤25.2 V, preventing latch-up or oxide breakdown. | Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loop) from ESD and field wiring faults. IC Role / Device Role / Timing Role: TVS connected across signal and ground, absorbing ±8 kV contact ESD per IEC 61000-4-2. Use Value: Maintains signal integrity by clamping transients within 1 ns, with leakage <1 μA ensuring minimal offset error. |
| Consumer Power Adapter Input Protection | MOSFET Gate Driver Transient Suppression |
Use Scenario: Safeguarding AC-DC adapter primary-side rectifier and controller ICs against lightning-induced surges. IC Role / Device Role / Timing Role: TVS placed across bulk capacitor input, triggered only during overvoltage events exceeding 15.3 V. Use Value: Absorbs 600 W pulses without degradation, preserving adapter reliability across 100,000+ surge cycles. | Use Scenario: Preventing gate oxide failure in high-side N-channel MOSFET drivers subjected to shoot-through induced voltage spikes. IC Role / Device Role / Timing Role: TVS mounted directly at gate-source terminals to clamp dv/dt-induced overshoot. Use Value: Clamps gate-source voltage to ≤25.2 V, staying well below typical 20 V absolute max rating of logic-level MOSFETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | Same VWM (15.3 V), identical SMB package, but lower PPPM = 400 W and higher VC = 29.2 V at 13.7 A | Less suitable for automotive load-dump where 600 W capability is required; better for cost-sensitive consumer ESD-only use | Select SMAJ18A only if surge energy is limited to <400 W and higher clamping voltage is acceptable |
| SMCJ18A | Same VWM and VC, but larger SMC (DO-214AB) package, higher PPPM = 1500 W, and lower RθJA = 35 °C/W | Used where higher surge endurance or improved thermal dissipation is needed; requires larger PCB footprint | Choose SMCJ18A when system-level testing reveals insufficient margin with 600 W rating or thermal rise exceeds limits |
Compared with SMAJ18A and SMCJ18A, the SM6T18A-M3/5B delivers optimal balance of 600 W surge handling, SMB footprint, and 25.2 V clamping-making it ideal for space-constrained automotive and industrial modules where both size and robustness are critical.
Availability
SM6T18A-M3/5B is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, consumer power adapters, and MOSFET gate driver circuits requiring stable component supply and halogen-free compliance.
Supply support for SM6T18A-M3/5B 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 and automotive qualification.
The SM6T Series was engineered specifically for high-reliability transient suppression in harsh environments-targeting AEC-Q101 qualified applications while maintaining commercial-grade cost structure via M3/E3 variants.
FAQ
What is the clamping voltage of the SM6T18A-M3/5B under a 10/1000 μs surge?
The SM6T18A-M3/5B clamps to a maximum of 25.2 V when subjected to its rated peak pulse current of 24 A using the 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88385 and defines the upper voltage limit imposed on protected circuitry during surge events. The SM6T18A-M3/5B maintains this clamping performance across its full operating temperature range when properly mounted on recommended copper pads.
Is the SM6T18A-M3/5B AEC-Q101 qualified?
No, the SM6T18A-M3/5B is not AEC-Q101 qualified. It carries the M3 suffix indicating halogen-free, RoHS-compliant commercial grade construction. For AEC-Q101 qualification, Vishay specifies part numbers with HE3 or HM3 suffixes (e.g., SM6T18AHM3_B/I). The SM6T18A-M3/5B meets all electrical and mechanical specifications of the SM6T family but lacks the extended reliability testing required for automotive qualification.
What does the "/5B" in SM6T18A-M3/5B indicate?
"/5B" denotes the packaging configuration: 13-inch diameter plastic tape and reel containing 3200 units. This is distinct from "/52", which indicates a 7-inch reel with 750 units. The "M3" prefix confirms halogen-free, RoHS-compliant materials, while "SM6T18A" identifies the 18 V unidirectional TVS variant. The SM6T18A-M3/5B is fully compatible with standard SMT pick-and-place equipment calibrated for SMB (DO-214AA) devices.
How does the thermal resistance of the SM6T18A-M3/5B affect PCB layout?
The SM6T18A-M3/5B 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. To maintain TJ ≤150 °C under 5.0 W steady-state dissipation, PCB layout must provide adequate copper area and thermal vias. Reducing pad size or omitting thermal relief increases RθJA, risking premature thermal shutdown or parametric shift. The SM6T18A-M3/5B performance is validated only with the specified mounting conditions.
Can the SM6T18A-M3/5B be used in bidirectional configurations?
No, the SM6T18A-M3/5B is strictly unidirectional, as indicated by the "A" suffix and cathode band marking. Bidirectional operation requires the "CA" suffix (e.g., SM6T18CA). Using the SM6T18A-M3/5B in reverse-biased AC signal paths will result in forward conduction and potential failure. The SM6T18A-M3/5B must be oriented with cathode toward the protected line and anode to ground or reference potential.
SM6T18A-M3/5B 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-M3/5B FAQ
1.How can I place an order for SM6T18A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18A-M3/5B 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-M3/5B reliable?
The price and inventory of SM6T18A-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T18A-M3/5B is usually 5 days.
3.What payment methods are accepted for SM6T18A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18A-M3/5B?
SM6T18A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18A-M3/5B 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-M3/5B?
For technical support, including SM6T18A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18A-M3/5B requirements.
6.How does Aetrix verify that SM6T18A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SM6T18A-M3/5B 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-M3/5B meets industry standards.
7.What is the process for return or replacement of SM6T18A-M3/5B?
All SM6T18A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18A-M3/5B, 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-M3/5B part is unused and in its original packaging.
Return procedure for SM6T18A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T18A-M3/5B 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 …
