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Vishay General Semiconductor - Diodes Division SMBJ18CAHM3/H
- Part No.:
- SMBJ18CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18CAHM3/H.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,850
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Product details
Overview
SMBJ18CAHM3/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal or power lines. It features 18 V standoff voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), and clamps to ≤29.2 V at 20.5 A peak surge current - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ18CAHM3/H datasheet, SMBJ18CAHM3/H pinout, SMBJ18CAHM3/H application, or SMBJ18CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), low thermal resistance (RθJL = 20 °C/W), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamping protector using an avalanche junction, responding in <1 ps to transient overvoltages. Its bidirectional symmetry ensures identical clamping behavior in both polarities, with leakage current ≤1.0 µA at 18 V standoff and temperature coefficient of VBR at +0.092 %/°C.
Rated for -55 °C to +150 °C operating junction temperature, it delivers 600 W peak pulse power under standardized 10/1000 µs waveform, derated linearly above 25 °C ambient per Fig. 2, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse working voltage before clamping initiates |
| VBR min/max | 20.0 V / 22.1 V at 1 mA - guaranteed breakdown range defining turn-on threshold |
| VC @ IPPM | 29.2 V at 20.5 A - clamped voltage during 600 W transient, limiting downstream stress |
| PPPM | 600 W (10/1000 µs) - surge energy handling capacity without failure |
| ID @ VWM | ≤1.0 µA - ultra-low leakage preserves signal integrity in high-impedance circuits |
| TJ max | +150 °C - enables operation in under-hood automotive or industrial enclosures |
| RθJL | 20 °C/W - low junction-to-lead thermal resistance supports sustained power dissipation |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H), MSL Level 1, 260 °C reflow compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; reference node for bidirectional symmetry | No polarity marking - symmetric terminals enable orientation-agnostic PCB layout |
| Cathode | Current exit terminal in forward bias; reference node for bidirectional symmetry | No polarity marking - identical to Anode in bidirectional configuration; no band marking required |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC performance in both directions - eliminates polarity-aware routing and reduces BOM variants |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD - suitable for ADAS sensor power rails |
| Halogen-free HM3 suffix | Meets IEC 61249-2-21 requirements - supports green manufacturing and end-of-life compliance |
| 600 W peak pulse rating | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth) when mounted per recommended pad layout |
| Low RθJL = 20 °C/W | Enables higher sustained surge repetition rates without thermal runaway in compact layouts |
Applications
| Industrial Sensor Interface | Automotive CAN Bus Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors exposed to relay switching noise in factory automation cabinets. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed across differential signal pair (e.g., 4–20 mA loop or RS-485 bus) to shunt transients before they reach ADC or transceiver inputs. Use Value: Limits induced spikes to ≤29.2 V, preventing latch-up or damage to 3.3 V/5 V interface ICs while maintaining sub-µA leakage for precision measurement accuracy. |
Use Scenario: Safeguarding CAN_H/CAN_L lines in body control modules against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Paired SMBJ18CAHM3/H devices (one per line) referenced to ground, providing symmetrical clamping without affecting dominant/recessive logic timing. Use Value: Clamps 10/1000 µs surges up to 600 W while preserving CAN signal edge integrity due to <1 ps response and low capacitance (<100 pF at 0 V). |
| Telecom Line Card Protection | Power Supply Input Stage |
|
Use Scenario: Shielding Ethernet PHY front-end or DSL line drivers from lightning-induced surges entering via RJ-45 jacks. IC Role / Device Role / Timing Role: Installed at board edge between connector and magnetics, clamping common-mode transients before isolation transformers. Use Value: Withstands repeated 6 kV EFT bursts (IEC 61000-4-4) and 4 kV surge (IEC 61000-4-5) without degradation, verified per AEC-Q101 stress profiles. |
Use Scenario: Secondary-side overvoltage suppression on 24 V DC input rails feeding FPGA or microcontroller power domains. IC Role / Device Role / Timing Role: Parallel-connected across input capacitor to clamp inductive kickback from upstream DC/DC converter switching or relay de-energization. Use Value: Limits transient overshoot to 29.2 V, protecting 33 V-rated input capacitors and LDOs while dissipating full 600 W pulse within SMB footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CAHE3/H | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification | Acceptable where halogen-free requirement is not mandated (e.g., non-automotive industrial) | Select when cost sensitivity outweighs halogen-free compliance; identical footprint and performance |
| SMAJ18CAHM3 | Lower 400 W PPPM rating; SMA package (smaller, higher RθJA = 140 °C/W) | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 or automotive load dump | Choose only for space-constrained consumer designs with <400 W surge exposure and no AEC-Q101 need |
Compared with SMBJ18CAHE3/H, SMBJ18CAHM3/H adds halogen-free compliance without trade-offs in clamping or qualification; versus SMAJ18CAHM3, it delivers 50 % higher surge power handling and superior thermal performance in the same application space.
Availability
SMBJ18CAHM3/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive CAN bus protection, and telecom line card designs requiring stable component supply, long-term lifecycle support, and halogen-free compliance.
Supply support for SMBJ18CAHM3/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 and application-specific optimization.
The SMBJ series targets robust transient suppression in harsh environments - engineered for automotive, industrial, and telecom systems where failure modes must be mitigated without compromising signal fidelity or thermal margin.
FAQ
What is the clamping voltage of SMBJ18CAHM3/H at its rated peak pulse current?
The SMBJ18CAHM3/H clamps to a maximum of 29.2 V at its peak pulse current of 20.5 A (10/1000 µs waveform). This value is measured under standardized test conditions with 0.2" × 0.2" copper pads per JEDEC guidelines and defines the upper voltage limit imposed on protected circuitry during surge events.
Is SMBJ18CAHM3/H suitable for automotive applications?
Yes, SMBJ18CAHM3/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction. It is explicitly rated for automotive use in subsystems such as body electronics, infotainment power rails, and sensor interfaces where transient immunity and long-term reliability are critical.
How does the bidirectional design of SMBJ18CAHM3/H affect PCB layout?
The SMBJ18CAHM3/H has no polarity marking and identical electrical behavior in both directions, allowing unrestricted orientation during automated placement. This eliminates the need for silkscreen polarity indicators or orientation-dependent routing, reducing assembly errors and simplifying layout for differential or AC-coupled lines.
What is the maximum operating temperature for SMBJ18CAHM3/H?
The SMBJ18CAHM3/H supports a junction temperature range of -55 °C to +150 °C. Its thermal resistance from junction to lead is 20 °C/W, enabling reliable operation in sealed enclosures or under-hood environments where ambient temperatures exceed 105 °C, provided PCB copper area meets minimum pad recommendations.
Does SMBJ18CAHM3/H meet UL recognition standards?
Yes, SMBJ18CAHM3/H carries Underwriters Laboratories recognition under UL 497B (QVGQ2) for protector classification, with file number E136766. This applies to both unidirectional and bidirectional variants and confirms compliance for use in safety-critical surge protection circuits across commercial and industrial equipment.
SMBJ18CAHM3/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:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ18CAHM3/H FAQ
1.How can I place an order for SMBJ18CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18CAHM3/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 SMBJ18CAHM3/H reliable?
The price and inventory of SMBJ18CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ18CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMBJ18CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18CAHM3/H?
SMBJ18CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18CAHM3/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 SMBJ18CAHM3/H?
For technical support, including SMBJ18CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18CAHM3/H requirements.
6.How does Aetrix verify that SMBJ18CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ18CAHM3/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 SMBJ18CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMBJ18CAHM3/H?
All SMBJ18CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18CAHM3/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 SMBJ18CAHM3/H part is unused and in its original packaging.
Return procedure for SMBJ18CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18CAHM3/H Tags
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