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Vishay General Semiconductor - Diodes Division SMB10J18AHE3/5B
- Part No.:
- SMB10J18AHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB10J18AHE3/5B.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,702
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Product details
Overview
SMB10J18AHE3/5B from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on power and signal lines. It features a 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR at 1 mA), 29.2 V clamping voltage (VC) at 34.2 A peak pulse current, and 1000 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive ECUs, industrial sensor interfaces, and DC power rail protection.
For engineers reviewing the SMB10J18AHE3/5B datasheet, SMB10J18AHE3/5B pinout, SMB10J18AHE3/5B application, or SMB10J18AHE3/5B equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 72 °C/W), polarity marking convention, and real-world design implications for surge immunity in 12 V/24 V systems.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (<1 µA leakage at 18 V), then rapidly avalanches below 22.1 V to clamp transients within nanoseconds. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, critical for repeatable clamping performance across temperature (-55 to +150 °C).
Designed for surface-mount automation, SMB10J18AHE3/5B meets J-STD-020 MSL Level 1 (260 °C peak reflow), supports 100 A non-repetitive forward surge (8.3 ms half-sine), and achieves 29.2 V clamping at 34.2 A - enabling robust protection of downstream MOSFETs, CAN transceivers, and microcontroller I/O without overvoltage stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA; defines safe DC bias margin for 12 V/24 V rails. |
| VBR (min/max) | 20.0 V / 22.1 V at 1 mA - tight 5% tolerance ensures predictable turn-on across production lots and temperature. |
| VC @ IPPM | 29.2 V at 34.2 A - clamping voltage during 10/1000 µs surge; limits protected IC voltage to safe level below 30 V absolute max. |
| PPPM | 1000 W - peak pulse power handling capability; sustains 34.2 A surges without degradation when mounted on 5 mm × 5 mm copper pads. |
| RθJA | 72 °C/W - junction-to-ambient thermal resistance; enables thermal design for sustained surge duty cycles in enclosed enclosures. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per AEC standard. |
| Package | SMB (DO-214AA) - industry-standard 2-pin SMD outline with cathode band marking; compatible with automated pick-and-place and reflow. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, RoHS-compliant and halogen-free (HE3 suffix). Cathode indicated by color band on body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes clamping path during positive transients on cathode side. |
| Cathode | Protected line input | Connected to line being protected (e.g., 12 V supply or CAN_H); avalanche conduction occurs from cathode to anode during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping | Enables asymmetric protection on DC-biased lines (e.g., 12 V supply) without forward conduction during normal operation. |
| AEC-Q101 qualification | Validates suitability for automotive applications including engine control, body electronics, and ADAS sensor modules. |
| 72 °C/W RθJA | Supports thermal management in compact PCB layouts with minimal copper area; avoids derating below 80% of rated PPPM. |
| Glass-passivated junction | Ensures long-term stability of VBR and low leakage (<1 µA at VWM) across humidity and temperature stress. |
| MSL Level 1 | Permits single-reflow assembly without moisture sensitivity concerns; eliminates bake requirements prior to SMT. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed MCU power inputs against load dump and alternator ripple in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt clamping device placed between VIN and GND, activated within <1 ns upon exceeding 20 V. Use Value: Limits voltage seen by downstream LDOs and microcontrollers to ≤29.2 V during ISO 7637-2 Pulse 5a (100 V/100 ms), preventing latch-up or permanent damage. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA transmitter outputs) from ESD and inductive switching noise in factory automation. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS placed across signal and return, referenced to local ground plane. Use Value: Clamps fast transients (IEC 61000-4-2 ±8 kV contact) to <30 V while maintaining <1 µA leakage at 24 V nominal, preserving signal integrity. |
| DC-DC Converter Input Stage | Automotive CAN Bus Node Protection |
|
Use Scenario: Front-end surge suppression on buck converter inputs exposed to 24 V truck battery systems with high dV/dt events. IC Role / Device Role / Timing Role: Primary overvoltage clamp ahead of input capacitor and controller IC; absorbs energy before reaching switching stage. Use Value: Handles 1000 W pulses without failure, reducing need for redundant protection stages and minimizing board space vs. multi-stage solutions. |
Use Scenario: Secondary-level protection on CAN_H/CAN_L lines near physical layer transceivers in gateway modules. IC Role / Device Role / Timing Role: Unidirectional TVS on each line (cathode to line, anode to ground) to suppress common-mode surges without affecting differential signaling. Use Value: Maintains CAN bus eye diagram integrity under ISO 16750-2 transient tests due to sub-30 V clamping and <100 ps response time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18AHE3/5B | Same VWM (18 V), identical SMB package, but lower PPPM (600 W) and higher VC (33.2 V at 18.7 A). | Not suitable for 1000 W surge environments like load dump; limited to lower-energy ESD or switching noise. | Select SMB10J18AHE3/5B where full ISO 7637-2 compliance is required; SMBJ18AHE3/5B only for cost-sensitive, lower-stress nodes. |
| 1.5SMC18AH | Same VWM/VBR, but SMC (DO-214AB) package - 2.5× larger footprint and 20% higher RθJA (86 °C/W). | Requires more PCB area and exhibits higher thermal rise under repeated surges; not optimized for dense automotive modules. | Choose SMB10J18AHE3/5B for space-constrained AEC-Q101 designs; 1.5SMC18AH only if legacy layout or higher surge margin beyond 1000 W is needed. |
Compared with SMBJ18AHE3/5B and 1.5SMC18AH, SMB10J18AHE3/5B uniquely delivers 1000 W surge capacity in the compact SMB outline with AEC-Q101 validation - making it the optimal choice for next-generation automotive and industrial power rail protection where size, reliability, and energy handling are jointly constrained.
Availability
SMB10J18AHE3/5B is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interface modules, and DC-DC converter input protection requiring stable component supply and AEC-Q101 traceability.
Supply support for SMB10J18AHE3/5B 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-grade qualification.
The SMB10J series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power-density transient suppression in harsh environments - targeting automotive, industrial, and transportation systems demanding AEC-Q101 compliance and repeatable clamping performance.
FAQ
What is the clamping voltage of SMB10J18AHE3/5B and how does it protect downstream components?
The SMB10J18AHE3/5B has a maximum clamping voltage (VC) of 29.2 V at 34.2 A peak pulse current (10/1000 µs waveform). This means that during a surge event, the device limits the voltage across protected circuitry to ≤29.2 V - well below typical 30 V absolute maximum ratings of automotive MCUs and power management ICs. Its fast response (<1 ns) and low dynamic impedance ensure effective energy diversion before sensitive components experience overstress.
Is SMB10J18AHE3/5B qualified for automotive use, and what standards does it meet?
Yes, SMB10J18AHE3/5B is AEC-Q101 qualified, as confirmed by Vishay's official documentation (Doc. #88422, Rev. 09-Jan-2024). It passes stress tests including temperature cycling, high-temperature reverse bias (HTRB), and electrostatic discharge per AEC-Q101. The HE3 suffix explicitly denotes RoHS-compliant and AEC-Q101-qualified variants - making SMB10J18AHE3/5B suitable for engine control, body electronics, and ADAS applications.
How does the SMB10J18AHE3/5B differ from the SMBJ18AHE3/5B in practical design terms?
SMB10J18AHE3/5B delivers 1000 W peak pulse power versus 600 W for SMBJ18AHE3/5B, with lower clamping voltage (29.2 V vs. 33.2 V at rated current). This translates directly to superior surge immunity: SMB10J18AHE3/5B can handle ISO 7637-2 Pulse 5a (load dump) without derating, whereas SMBJ18AHE3/5B requires additional series impedance or parallel staging. Both share the same SMB package and VWM, but SMB10J18AHE3/5B is the only one rated for full automotive load dump compliance.
What is the thermal resistance of SMB10J18AHE3/5B and how does it affect PCB layout?
SMB10J18AHE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per Vishay's datasheet. To maintain reliability under repetitive surges, designers must allocate ≥5 mm² copper per pad and avoid thermal isolation - otherwise, junction temperature rise may exceed 150 °C, triggering premature wear-out or parametric shift.
Does SMB10J18AHE3/5B support automated manufacturing, and what assembly guidelines apply?
Yes, SMB10J18AHE3/5B is optimized for automated placement and reflow: it meets J-STD-020 MSL Level 1 (peak reflow ≤260 °C), uses matte tin-plated leads compliant with J-STD-002 and JESD22-B102, and passes JESD201 Class 2 whisker testing. No pre-bake is required. Standard lead-free reflow profiles (e.g., IPC/JEDEC J-STD-020) apply - no special stencil or profile adjustments needed for high-yield SMT assembly.
SMB10J18AHE3/5B 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB10J18AHE3/5B FAQ
1.How can I place an order for SMB10J18AHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB10J18AHE3/5B 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 SMB10J18AHE3/5B reliable?
The price and inventory of SMB10J18AHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB10J18AHE3/5B is usually 5 days.
3.What payment methods are accepted for SMB10J18AHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB10J18AHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB10J18AHE3/5B?
SMB10J18AHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB10J18AHE3/5B 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 SMB10J18AHE3/5B?
For technical support, including SMB10J18AHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB10J18AHE3/5B requirements.
6.How does Aetrix verify that SMB10J18AHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMB10J18AHE3/5B 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 SMB10J18AHE3/5B meets industry standards.
7.What is the process for return or replacement of SMB10J18AHE3/5B?
All SMB10J18AHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB10J18AHE3/5B, 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 SMB10J18AHE3/5B part is unused and in its original packaging.
Return procedure for SMB10J18AHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB10J18AHE3/5B Tags
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