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Vishay General Semiconductor - Diodes Division SMBJ18AHM3_B/H
- Part No.:
- SMBJ18AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18AHM3_B/H.pdf
- Description:
- 600W,18V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,924
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Product details
Overview
SMBJ18AHM3_B/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed to protect sensitive electronics against ESD, lightning-induced surges, and inductive switching transients. 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 rating with 10/1000 µs waveform.
For engineers reviewing the SMBJ18AHM3_B/H datasheet, SMBJ18AHM3_B/H pinout, SMBJ18AHM3_B/H application, or SMBJ18AHM3_B/H equivalent, key selection criteria include clamping performance under 20.5 A surge, thermal resistance (RθJA = 100 °C/W), unidirectional polarity with cathode band marking, and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker test.
Technical Context
This TVS diode operates as a voltage-clamping protection device placed in parallel with circuit nodes vulnerable to overvoltage events. Its silicon avalanche junction provides sub-nanosecond response time and low dynamic impedance during transient suppression, enabling effective protection of downstream ICs, MOSFETs, and sensor signal lines without affecting normal operation below 18 V.
The SMBJ18AHM3_B/H is rated for -55 °C to +150 °C operating junction temperature, supports 100 A non-repetitive forward surge current (IFSM), and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its halogen-free, RoHS-compliant construction (HM3 suffix) and AEC-Q101 qualification make it suitable for automotive and industrial environments where reliability and material compliance are critical.
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 1 mA - Confirmed breakdown range ensures predictable turn-on threshold across production lots. |
| VC @ IPPM | 29.2 V at 20.5 A - Clamping voltage limits stress on protected components during 10/1000 µs surge events. |
| PPPM | 600 W - Peak pulse power handling capability with standard 10/1000 µs waveform at 0.01% duty cycle. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on recommended 5.0 mm × 5.0 mm copper pads; guides PCB thermal design. |
| TJ max | +150 °C - Maximum junction temperature enables use in under-hood automotive and high-temperature industrial enclosures. |
| Polarity | Unidirectional - Cathode band denotes polarity; blocks reverse conduction until breakdown, ideal for DC supply rail protection. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H). Polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (during clamping) | Connected to lower-potential side of protected line; forms avalanche path when reverse-biased beyond VBR. |
| Cathode | Reverse-biased terminal (marked with band) | Connected to higher-potential side (e.g., VCC rail); defines unidirectional blocking direction and clamping reference. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV line-to-earth) without derating on standard PCB pads. |
| 29.2 V clamping voltage @ 20.5 A | Limits voltage overshoot to ≤29.2 V during worst-case surge, safeguarding 24 V logic interfaces and automotive microcontrollers. |
| Halogen-free, RoHS-compliant (HM3) | Meets IPC-1752A material declaration requirements and JESD201 Class 2 whisker resistance for long-term reliability in harsh environments. |
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body electronics, and ADAS sensor modules per stress test requirements. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V power inputs in automotive ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND, clamping surges within nanoseconds to prevent damage to PMICs and MCU power domains. Use Value: Withstands 600 W pulses and maintains clamping at ≤29.2 V, ensuring system-level ISO 7637-2 compliance without additional filtering. | Use Scenario: Shielding analog outputs (e.g., 4–20 mA current loops) in factory automation sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: TVS connected across signal and return lines to shunt fast transients before they reach precision DACs or op-amps. Use Value: Sub-ns response and low clamping voltage preserve signal integrity while meeting IEC 61000-4-2 Level 4 (15 kV air) immunity requirements. |
| Consumer Device USB Port Protection | Telecom Equipment DC Input Protection |
Use Scenario: Safeguarding USB VBUS lines in portable chargers and docking stations against hot-plug and ESD events. IC Role / Device Role / Timing Role: Unidirectional TVS on VBUS rail referenced to GND, absorbing ±15 kV contact ESD per IEC 61000-4-2. Use Value: Low leakage (<1 µA at 18 V) prevents standby current drain; compact SMB footprint saves board space in slim form factors. | Use Scenario: Securing -48 V DC input stages in telecom base station power supplies against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: TVS mounted at front-end connector to clamp common-mode surges before entering DC/DC converters and monitoring circuits. Use Value: 20.0–22.1 V VBR ensures stable operation at nominal -48 V systems with sufficient margin; AEC-Q101 grade adds field reliability assurance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A-E3/52 | RoHS-compliant but not halogen-free; no AEC-Q101 qualification; same electrical specs and SMB package. | Targeted at commercial-grade consumer and computing applications where automotive qualification is unnecessary. | Select when halogen-free content and automotive qualification are not required, and cost optimization is prioritized. |
| SAC18 | Same VWM (18 V) and VC (29.2 V), but in SOD-123FL package (smaller footprint, lower IPPM = 17.5 A, PPPM = 400 W). | Better suited for space-constrained designs with lower surge exposure; not rated for AEC-Q101 or 600 W events. | Choose only for compact layouts with <400 W surge requirements; verify thermal derating due to smaller pad area and higher RθJA. |
Compared with SMBJ18A-E3/52, SMBJ18AHM3_B/H adds halogen-free construction and AEC-Q101 qualification without sacrificing clamping performance; versus SAC18, it delivers 50% higher surge power handling and automotive-grade reliability at the cost of larger SMB footprint.
Availability
SMBJ18AHM3_B/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom DC input surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMBJ18AHM3_B/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, rectifiers, MOSFETs, and protection devices with emphasis on high-reliability, high-efficiency, and application-specific performance.
The SMBJ series is engineered for robust transient suppression in demanding environments-designed to meet automotive, industrial, and telecom surge immunity standards while maintaining tight parametric consistency and long-term stability.
FAQ
What is the maximum clamping voltage of SMBJ18AHM3_B/H under a 10/1000 µs surge?
The SMBJ18AHM3_B/H has a maximum clamping voltage (VC) of 29.2 V at 20.5 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024, Document Number 88392. The clamping performance ensures protected circuits remain within safe voltage margins during standardized surge events.
Is SMBJ18AHM3_B/H suitable for automotive applications?
Yes, SMBJ18AHM3_B/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction validated for automotive use. It is specified for operating junction temperatures from -55 °C to +150 °C and meets MSL Level 1 reflow requirements-making SMBJ18AHM3_B/H appropriate for engine control units, body electronics, and ADAS sensor modules.
How does the SMBJ18AHM3_B/H differ from the SMBJ18A-E3/52 variant?
SMBJ18AHM3_B/H and SMBJ18A-E3/52 share identical electrical characteristics (VWM = 18 V, VC = 29.2 V, PPPM = 600 W) and SMB (DO-214AA) package, but SMBJ18AHM3_B/H adds halogen-free material compliance and AEC-Q101 qualification. The E3/52 version is RoHS-compliant only and intended for commercial-grade applications without automotive validation requirements.
What is the thermal resistance of SMBJ18AHM3_B/H, and how does it affect PCB layout?
The SMBJ18AHM3_B/H 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. This value assumes minimum recommended pad layout per Vishay's datasheet; reducing pad size increases thermal resistance and requires derating of power dissipation. Proper copper pour design is essential to maintain SMBJ18AHM3_B/H within its 150 °C TJ limit during repetitive surge events.
Does SMBJ18AHM3_B/H have bidirectional capability?
No, SMBJ18AHM3_B/H is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. Bidirectional variants use the "CA" suffix (e.g., SMBJ18CA). The unidirectional configuration allows SMBJ18AHM3_B/H to block reverse current up to 18 V while clamping positive transients on DC rails-ideal for protecting VCC lines where polarity is fixed and reverse conduction must be prevented.
SMBJ18AHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Active
- 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_B/H FAQ
1.How can I place an order for SMBJ18AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18AHM3_B/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 SMBJ18AHM3_B/H reliable?
The price and inventory of SMBJ18AHM3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ18AHM3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ18AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18AHM3_B/H?
SMBJ18AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18AHM3_B/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 SMBJ18AHM3_B/H?
For technical support, including SMBJ18AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18AHM3_B/H requirements.
6.How does Aetrix verify that SMBJ18AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ18AHM3_B/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 SMBJ18AHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ18AHM3_B/H?
All SMBJ18AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18AHM3_B/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 SMBJ18AHM3_B/H part is unused and in its original packaging.
Return procedure for SMBJ18AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18AHM3_B/H Tags
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