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Vishay General Semiconductor - Diodes Division SMBJ18AHM3/I
- Part No.:
- SMBJ18AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18AHM3/I.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,052
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Product details
Overview
SMBJ18AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients 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 maximum clamping voltage (VC) at 20.5 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), used to protect MOSFETs, ICs, and sensor interfaces in industrial and automotive electronics.
For engineers reviewing the SMBJ18AHM3/I datasheet, SMBJ18AHM3/I pinout, SMBJ18AHM3/I application, or SMBJ18AHM3/I equivalent, key selection criteria include unidirectional polarity, 1.0 µA max reverse leakage at VWM, AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, and thermal resistance of 100 °C/W junction-to-ambient - all critical for robust overvoltage protection in high-reliability embedded systems.
Technical Context
This TVS diode operates as a silicon avalanche clamp, responding in <1 ps to transient overvoltages and limiting induced surges before they damage downstream components. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance, while the SMB package supports automated SMT placement and meets MSL Level 1 reflow requirements (260 °C peak).
The device is rated for -55 °C to +150 °C operating junction temperature, with derated peak pulse power above 25 °C per Figure 2. It delivers 29.2 V clamping at 20.5 A (10/1000 µs), and exhibits a 0.092 %/°C temperature coefficient of VBR - enabling predictable performance across thermal environments in motor drives and power supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 15–18 V DC rails. |
| VBR (min/max) | 20.0 V / 22.1 V at IT = 1 mA - Confirmed breakdown range ensures reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 29.2 V at 20.5 A (10/1000 µs) - Clamping voltage limits stress on protected ICs; enables compatibility with 3.3 V/5 V logic I/O and 12–24 V power stages. |
| PPPM | 600 W - Peak pulse power handling capability under standardized 10/1000 µs surge; sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω) events. |
| ID @ VWM | 1.0 µA max - Ultra-low reverse leakage preserves efficiency in battery-powered and low-power sensor circuits. |
| TJ max. | +150 °C - High junction temperature rating supports operation in engine control units, industrial PLCs, and enclosed power converters. |
| Package | SMB (DO-214AA) - Standardized 2-pin surface-mount outline with 5.21 mm × 4.06 mm footprint and 2.20 mm height; compatible with IPC-7351B land patterns. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional polarity with cathode band marking. Matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102.
| 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 terminal | Connected to the line being protected (e.g., 12 V rail or sensor signal); avalanche conduction occurs when voltage exceeds VBR relative to anode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for ADAS camera modules and body control units. |
| Halogen-free & RoHS-compliant | Meets environmental compliance mandates for EU, China, and Japan markets without compromising surge robustness or thermal performance. |
| 600 W peak pulse power (10/1000 µs) | Handles repetitive surge events up to 0.01% duty cycle - supports long-term protection in industrial motor controllers with frequent switching noise. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage overshoot during clamping; reduces risk of latch-up or gate oxide damage in protected MOSFETs and microcontrollers. |
| MSL Level 1 moisture sensitivity | Enables standard reflow assembly without baking; eliminates production delays and cost overhead in high-volume manufacturing. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V power inputs in automotive body control modules against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery feed and LDO input to absorb >100 V transients within nanoseconds. Use Value: Prevents permanent damage to voltage regulators and CAN transceivers by limiting clamped voltage to 29.2 V - well below 36 V absolute maximum ratings. |
Use Scenario: Shielding analog output lines of pressure sensors in factory automation systems from ESD and inductive kickback. IC Role / Device Role / Timing Role: Low-leakage (1.0 µA) TVS connected between signal line and ground to suppress ±8 kV contact ESD per IEC 61000-4-2. Use Value: Maintains signal integrity with negligible DC loading while clamping fast transients before they corrupt 4–20 mA or 0–10 V outputs. |
| DC-DC Converter Input Protection | Motor Drive Gate Driver Protection |
|
Use Scenario: Safeguarding buck converter inputs in telecom power supplies exposed to lightning-induced surges on PoE or AC/DC front-ends. IC Role / Device Role / Timing Role: Primary transient suppressor upstream of input capacitors and controller ICs, sized for 600 W single-event energy absorption. Use Value: Enables compliance with IEC 61000-4-5 (1 kV/2 Ω) without requiring additional series impedance or active crowbar circuits. |
Use Scenario: Protecting high-side and low-side gate drivers in BLDC inverters from Miller-induced voltage spikes during MOSFET switching. IC Role / Device Role / Timing Role: Fast-response (<1 ps) TVS placed across gate-source terminals to clamp dv/dt-induced overshoot beyond ±20 V. Use Value: Prevents false turn-on and gate oxide breakdown by limiting transient excursions to ≤29.2 V - within safe SOA of 30 V-rated drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18AHE3/I | Same electrical specs, but RoHS-compliant commercial grade (not halogen-free or AEC-Q101 qualified). | Lacks automotive qualification and halogen-free certification; suitable only for non-automotive industrial or consumer use. | Select when AEC-Q101 and halogen-free requirements are not mandated, and cost optimization is prioritized. |
| SMAJ18A-M3 | Lower 400 W PPPM rating, SMA package (smaller footprint, higher RθJA = 150 °C/W), same VWM/VBR/VC. | Reduced surge handling and thermal performance; limited to lower-energy transients and less demanding thermal environments. | Choose only for space-constrained designs where 400 W surge capacity suffices and board-level cooling is enhanced. |
Compared with SMBJ18AHM3/I, SMBJ18AHE3/I offers identical clamping and leakage but omits automotive qualification, while SMAJ18A-M3 trades 33% lower pulse power and inferior thermal dissipation for smaller PCB area - making SMBJ18AHM3/I the optimal choice for AEC-Q101-compliant, high-surge, thermally constrained applications.
Availability
SMBJ18AHM3/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, DC-DC converter inputs, and motor drive gate protection requiring stable component supply and full traceability.
Supply support for SMBJ18AHM3/I 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 validation.
The SMBJ series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure due to voltage surges must be eliminated.
FAQ
What is the maximum clamping voltage of SMBJ18AHM3/I under a 10/1000 µs surge?
The SMBJ18AHM3/I has a maximum clamping voltage (VC) of 29.2 V at 20.5 A peak pulse current under the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024. The clamping performance ensures protected components remain within safe operating voltage margins during surge events.
Is SMBJ18AHM3/I qualified for automotive applications?
Yes, SMBJ18AHM3/I is AEC-Q101 qualified, as indicated by the "HM3" suffix (halogen-free, RoHS-compliant, and AEC-Q101 certified). It undergoes rigorous stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD verification - making it suitable for under-hood and chassis-mounted automotive electronics.
What does the "HM3" suffix mean in SMBJ18AHM3/I?
The "HM3" suffix in SMBJ18AHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from commercial-grade versions (e.g., E3 or M3) and confirms compliance with automotive reliability standards, material restrictions, and environmental regulations required for Tier 1 supplier BOMs.
Can SMBJ18AHM3/I be used in bidirectional protection circuits?
No, SMBJ18AHM3/I is a unidirectional TVS diode, identified by its cathode band marking and specified VBR/VWM parameters for single-polarity operation. For bidirectional protection, Vishay specifies part numbers with "CA" suffix (e.g., SMBJ18CA); using SMBJ18AHM3/I in reverse-biased configurations risks premature conduction or failure.
What is the thermal resistance of SMBJ18AHM3/I, and how does it affect layout?
SMBJ18AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. To maintain TJ ≤ 150 °C under sustained 5.0 W power dissipation, PCB layout must provide adequate copper area and avoid thermal bottlenecks - especially critical in automotive and industrial ambient temperature profiles.
SMBJ18AHM3/I 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):
- 20.5A
- Power - Peak Pulse:
- 600W
- 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)
SMBJ18AHM3/I FAQ
1.How can I place an order for SMBJ18AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18AHM3/I 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 SMBJ18AHM3/I reliable?
The price and inventory of SMBJ18AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ18AHM3/I is usually 5 days.
3.What payment methods are accepted for SMBJ18AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18AHM3/I?
SMBJ18AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18AHM3/I 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 SMBJ18AHM3/I?
For technical support, including SMBJ18AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18AHM3/I requirements.
6.How does Aetrix verify that SMBJ18AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ18AHM3/I 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 SMBJ18AHM3/I meets industry standards.
7.What is the process for return or replacement of SMBJ18AHM3/I?
All SMBJ18AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18AHM3/I, 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 SMBJ18AHM3/I part is unused and in its original packaging.
Return procedure for SMBJ18AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18AHM3/I Tags
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