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Vishay General Semiconductor - Diodes Division SMB10J18AHM3/H
- Part No.:
- SMB10J18AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB10J18AHM3/H.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMB10J18AHM3/H from Vishay General Semiconductor is a unidirectional high-power transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 1000 W peak pulse power (10/1000 µs), 34.2 A peak pulse current (IPPM), and clamps transients to ≤29.2 V at rated surge. It is AEC-Q101 qualified and halogen-free, targeting automotive power line and sensor interface protection.
For engineers reviewing the SMB10J18AHM3/H datasheet, SMB10J18AHM3/H pinout, SMB10J18AHM3/H application, or SMB10J18AHM3/H equivalent, key selection criteria include clamping voltage vs. protected IC's absolute maximum rating, surge current capability under system-level lightning/inductive load tests, AEC-Q101 qualification status for automotive deployment, and thermal resistance (RθJA = 72 °C/W) for board-level thermal design.
Technical Context
This TVS diode operates as a shunt-clamping device that remains high-impedance below VWM (18 V) and rapidly transitions to low-impedance conduction above VBR (20.0–22.1 V), limiting transient voltages to ≤29.2 V at 34.2 A. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1 ns).
Rated for 100 A non-repetitive forward surge (IFSM, 8.3 ms half-sine), it supports high-energy transient suppression in automotive 12 V systems. The SMB package provides MSL Level 1 moisture sensitivity and 260 °C lead-free reflow compatibility, with matte tin-plated leads meeting J-STD-002 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before significant leakage; defines upper limit of normal circuit operation. |
| VBR (min/max) | 20.0 V / 22.1 V at 1 mA - Voltage range where device reliably enters avalanche conduction; ensures predictable turn-on across temperature and lot variation. |
| VC @ IPPM | ≤29.2 V at 34.2 A - Clamped voltage during 10/1000 µs surge; must be below protected IC's absolute maximum input voltage. |
| PPPM | 1000 W (10/1000 µs) - Peak transient energy handling capacity; determines survivability against ISO 7637-2 Pulse 1/2a/5a or IEC 61000-4-5 surges. |
| ID @ VWM | ≤1.0 µA - Reverse leakage at stand-off voltage; critical for low-power sensor or battery-backed circuits to avoid excessive quiescent drain. |
| RθJA | 72 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; used to calculate max ambient temperature for 150 °C TJ limit. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including HTOL, TCT, ESD, and mechanical stress per AEC specification; required for under-hood and chassis applications. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with cathode band marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); mounting pad layout per Vishay spec: 5.59 mm × 1.52 mm minimum pad length/width.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path; carries full surge current during clamping. |
| Cathode | High-side connection point | Marked with color band; connected to protected line (e.g., 12 V rail or signal); defines polarity and clamping direction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity bias, and mechanical shock-enables direct deployment in engine control, ADAS, and body electronics. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets global environmental regulations and eliminates corrosive halogen emissions during PCB reflow or end-of-life incineration. |
| Low incremental surge resistance | Enables tighter clamping (VC = 29.2 V) at high IPPM (34.2 A), reducing voltage overshoot on protected ICs compared to higher-Rsurge TVS devices. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free assembly without pre-baking; compatible with automated SMT lines using IPC-J-STD-020 profile. |
| Glass-passivated junction | Provides stable VBR tolerance, low leakage drift over time/temperature, and immunity to surface contamination-induced leakage increase. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply rails in engine control units (ECUs) against load dump (ISO 7637-2 Pulse 5a) and alternator switching transients. IC Role / Device Role / Timing Role: Shunt-clamping TVS placed between battery rail and local regulator input; responds within <1 ns to clamp spikes up to 100 V. Use Value: Limits voltage seen by downstream LDOs and microcontrollers to ≤29.2 V, preventing latch-up or gate oxide damage while sustaining 1000 W surge energy. |
Use Scenario: Safeguarding analog front-end inputs of pressure/temperature sensors in factory automation PLC modules exposed to relay coil kickback. IC Role / Device Role / Timing Role: Unidirectional TVS connected between sensor signal line and ground; clamps negative-going transients induced by inductive switching. Use Value: Maintains signal integrity by suppressing >1 kV transients to <30 V within nanoseconds, avoiding ADC saturation or op-amp input stage damage. |
| Automotive Body Electronics | Consumer Power Adapter Input Stage |
|
Use Scenario: Overvoltage protection for LIN bus transceivers and LED driver ICs in door modules and lighting control units. IC Role / Device Role / Timing Role: TVS placed on VCC pin of LIN transceiver; absorbs ESD (IEC 61000-4-2 ±8 kV contact) and EFT (IEC 61000-4-4 ±2 kV) events. Use Value: Ensures uninterrupted communication by limiting clamped voltage below transceiver's 36 V abs max rating, with <1 µA leakage preserving sleep-mode current budget. |
Use Scenario: Secondary-side DC input protection in USB-C PD adapters subjected to surge testing per UL 1449 and IEC 62368-1. IC Role / Device Role / Timing Role: Unidirectional TVS on +5 V/9 V/15 V output rail; clamps overvoltage from feedback loop failure or secondary-side capacitor fault. Use Value: Prevents downstream device damage by clamping fault voltage to ≤29.2 V before OVP circuitry reacts, adding fail-safe redundancy to IC-based protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18AHE3/A | Same VWM (18 V), VBR (20.0–22.1 V), and VC (29.2 V), but RoHS-compliant commercial grade (E3), not AEC-Q101 qualified; RθJA = 72 °C/W identical. | Lacks automotive qualification; suitable for industrial or consumer applications where AEC-Q101 is not mandated. | Select SMBJ18AHE3/A when cost sensitivity outweighs automotive qualification requirements and thermal/environmental conditions are less severe. |
| SMAJ18A-HM3 | Lower PPPM (400 W vs. 1000 W); same VWM/VBR/VC specs; SMA package (smaller footprint, higher RθJA = 85 °C/W). | Insufficient for high-energy automotive load dump; limited to lower-energy ESD/EFT or signal-line protection. | Choose SMAJ18A-HM3 only for space-constrained, low-surge applications where 400 W rating suffices and board area is premium. |
Compared with SMBJ18AHE3/A, SMB10J18AHM3/H adds AEC-Q101 qualification and halogen-free compliance for automotive use; versus SMAJ18A-HM3, it delivers 2.5× higher surge power and lower thermal resistance-critical for under-hood reliability and high-current transient handling.
Availability
SMB10J18AHM3/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and consumer adapter secondary-side overvoltage safeguarding requiring stable component supply and long-term lifecycle support.
Supply support for SMB10J18AHM3/H 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, power efficiency, and automotive-grade performance.
The SMB10J series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh automotive and industrial environments where AEC-Q101 validation and consistent clamping performance are mandatory.
FAQ
What is the clamping voltage of SMB10J18AHM3/H at its rated peak pulse current?
The SMB10J18AHM3/H clamps to a maximum of 29.2 V when subjected to its rated peak pulse current of 34.2 A under the standard 10/1000 µs waveform. This value is measured and guaranteed per Vishay's datasheet (Document Number: 88422, page 2), ensuring predictable overvoltage limiting for protected downstream ICs. The SMB10J18AHM3/H maintains this clamping performance across its qualified operating temperature range.
Is SMB10J18AHM3/H suitable for automotive applications?
Yes, SMB10J18AHM3/H is AEC-Q101 qualified and explicitly designated for automotive use, as confirmed by its HM3 suffix and documentation in Vishay's 88422 datasheet. It meets requirements for temperature cycling, humidity bias, mechanical shock, and ESD robustness-making it appropriate for engine control units, body electronics, and ADAS modules. The SMB10J18AHM3/H also complies with halogen-free and RoHS directives required by Tier 1 suppliers.
How does the SMB10J18AHM3/H differ from the SMBJ18AHE3/A variant?
The SMB10J18AHM3/H and SMBJ18AHE3/A share identical electrical specs (VWM = 18 V, VBR = 20.0–22.1 V, VC = 29.2 V), but differ in qualification and material: SMB10J18AHM3/H is AEC-Q101 qualified and halogen-free (HM3), whereas SMBJ18AHE3/A is RoHS-compliant commercial grade (E3) without automotive qualification. Both use the same SMB package and thermal characteristics, but only SMB10J18AHM3/H is approved for under-hood deployment.
What is the maximum operating junction temperature for SMB10J18AHM3/H?
The SMB10J18AHM3/H has a maximum operating junction temperature (TJ max.) of +150 °C, as specified in the "Maximum Ratings" table of Vishay's 88422 datasheet. This rating enables reliable operation in high-ambient environments such as automotive engine compartments or industrial motor drives. Thermal design must ensure junction temperature stays within this limit using the device's RθJA = 72 °C/W and appropriate PCB copper area.
Does SMB10J18AHM3/H have polarity marking, and how is it identified?
Yes, SMB10J18AHM3/H is a unidirectional TVS diode with polarity clearly marked: a colored band on the cathode end of the SMB (DO-214AA) package. Per Vishay's mechanical drawing and datasheet notes, the banded end connects to the protected line (e.g., 12 V rail), while the unmarked end connects to ground. This marking is essential for correct orientation during placement and ensures proper clamping behavior during positive transients.
SMB10J18AHM3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 34.2A
- Power - Peak Pulse:
- 1000W (1kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB10J18AHM3/H FAQ
1.How can I place an order for SMB10J18AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB10J18AHM3/H 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 SMB10J18AHM3/H reliable?
The price and inventory of SMB10J18AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB10J18AHM3/H is usually 5 days.
3.What payment methods are accepted for SMB10J18AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB10J18AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB10J18AHM3/H?
SMB10J18AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB10J18AHM3/H 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 SMB10J18AHM3/H?
For technical support, including SMB10J18AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB10J18AHM3/H requirements.
6.How does Aetrix verify that SMB10J18AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMB10J18AHM3/H 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 SMB10J18AHM3/H meets industry standards.
7.What is the process for return or replacement of SMB10J18AHM3/H?
All SMB10J18AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB10J18AHM3/H, 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 SMB10J18AHM3/H part is unused and in its original packaging.
Return procedure for SMB10J18AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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