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Vishay General Semiconductor - Diodes Division SMBJ17CAHM3_B/I
- Part No.:
- SMBJ17CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ17CAHM3_B/I.pdf
- Description:
- 600W,17V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,162
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Product details
Overview
SMBJ17CAHM3_B/I from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 17 V standoff voltage (VWM), 19.9 V minimum breakdown voltage (VBR), 600 W peak pulse power rating (10/1000 µs), and clamps transients to ≤29.2 V at 20.5 A peak surge current - deployed on power rails and signal lines in industrial motor drives and telecom interface circuits.
For engineers reviewing the SMBJ17CAHM3_B/I datasheet, SMBJ17CAHM3_B/I pinout, SMBJ17CAHM3_B/I application, or SMBJ17CAHM3_B/I equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, AEC-Q101 qualification status, thermal resistance data, and real-world use context for ESD and lightning-induced surge protection in automotive-grade and high-reliability embedded systems.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 µA leakage at 17 V), then rapidly avalanches below 19.9 V to divert surge energy away from downstream ICs. Its bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity constraints.
Engineered for fast response (<1 ns), low dynamic impedance, and stable clamping across temperature (±0.092 %/°C VBR tempco), SMBJ17CAHM3_B/I sustains repetitive 600 W pulses at 0.01 % duty cycle while maintaining junction temperatures ≤150 °C - enabled by RθJA = 100 °C/W and RθJL = 20 °C/W thermal performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - maximum continuous reverse operating voltage before significant leakage; defines safe operating margin for 15–16 V nominal rails. |
| VBR (min) | 19.9 V at 1 mA - guaranteed avalanche initiation threshold; ensures reliable triggering before downstream device damage. |
| VC @ IPPM | 29.2 V at 20.5 A - clamped voltage during 10/1000 µs surge; determines maximum stress seen by protected circuitry. |
| PPPM | 600 W - peak pulse power handling capability; supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge compliance with margin. |
| IPPM | 20.5 A - peak surge current at VC; directly usable for PCB trace sizing and fuse coordination. |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive or enclosed industrial enclosures. |
| RθJA | 100 °C/W - thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs derating above 25 °C ambient. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C reflow peak), matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; common node for bidirectional conduction path. | Connected to line being protected (e.g., RS-485 A/B, DC input rail); no polarity marking on device body. |
| Cathode | Current exit terminal in forward bias; symmetric counterpart to Anode in bidirectional configuration. | Connected to reference plane (GND or return path); identical electrical role to Anode due to symmetrical construction. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC signals, differential buses (e.g., CAN, RS-485), and floating power domains without polarity concerns. |
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces per stress test requirements. |
| 600 W peak pulse power | Supports IEC 61000-4-5 surge immunity up to 1 kV open-circuit / 0.5 kV short-circuit test levels with design margin. |
| Low clamping ratio (VC/VBR ≈ 1.47) | Minimizes overvoltage overshoot during transient events, reducing risk of latch-up or gate oxide damage in protected MOSFETs/ICs. |
| Halogen-free, RoHS-compliant (HM3 suffix) | Meets environmental compliance mandates for industrial and automotive OEM supply chains without compromising surge robustness. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and current-sense amplifiers against inductive kickback from 24 V solenoid switching. IC Role / Device Role: Shunt TVS placed across MOSFET drain-source or op-amp inputs to clamp transients <29.2 V. Use Value: Prevents destructive overvoltage on 30 V-rated logic-level MOSFETs and 36 V-input op-amps during 100 V+ switching spikes. |
Use Scenario: Surge suppression on LIN bus lines exposed to load dump and battery reversal events in door module ECUs. IC Role / Device Role: Bidirectional TVS connected between LIN line and chassis ground to absorb ±100 V transients. Use Value: Maintains LIN physical layer integrity during ISO 7637-2 Pulse 1/2a/5a tests without signal distortion or bus lockup. |
| Telecom Power Interfaces | Consumer USB-C PD Ports |
|
Use Scenario: Input-stage protection for 48 V PoE-powered switches against lightning-induced surges on Ethernet pairs. IC Role / Device Role: TVS array element across each twisted pair (data + power) referenced to common-mode ground. Use Value: Limits common-mode surge voltage to <29.2 V, preserving isolation barrier integrity and preventing PHY IC latch-up. |
Use Scenario: Overvoltage guard on VBUS line of USB-C receptacles subjected to hot-plug and adapter fault conditions. IC Role / Device Role: Bidirectional clamping device between VBUS and GND to suppress ±20 V transients from faulty chargers. Use Value: Ensures USB PD controller survives 15 V/100 ms overvoltage events per USB-IF compliance test plan v2.1. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ17CAHE3_B/I | Same electrical specs, but RoHS-compliant commercial grade (non-halogen-free); lacks halogen-free certification. | Approved for non-automotive industrial use where halogen-free materials are not mandated. | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 is not needed. |
| SMAJ17CAHM3_A/H | Lower 400 W PPPM, SMA package (smaller footprint, higher RθJA = 140 °C/W), same VWM/VBR. | Suitable only for lower-energy transients (IEC 61000-4-2 ESD, not full IEC 61000-4-5 surge). | Choose for space-constrained consumer designs where 600 W surge headroom is unnecessary. |
Compared with SMBJ17CAHM3_B/I, the HE3 variant trades halogen-free compliance for lower cost in non-automotive settings, while the SMAJ17CAHM3_A/H reduces surge capacity and thermal performance to fit tighter layouts - neither offers drop-in replacement without layout or reliability reassessment.
Availability
SMBJ17CAHM3_B/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power interfaces requiring stable component supply with AEC-Q101 qualification and halogen-free compliance.
Supply support for SMBJ17CAHM3_B/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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series targets high-energy transient suppression in automotive, industrial, and telecom infrastructure - engineered for ruggedized surge handling, tight parameter distributions, and long-term stability under thermal cycling.
FAQ
What is the clamping voltage of SMBJ17CAHM3_B/I at its rated peak pulse current?
The SMBJ17CAHM3_B/I clamps to a maximum of 29.2 V at its specified peak pulse current of 20.5 A under the 10/1000 µs waveform condition. This value is measured per Figure 1 in Vishay document 88392 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ17CAHM3_B/I maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.
Is SMBJ17CAHM3_B/I suitable for automotive applications?
Yes, SMBJ17CAHM3_B/I is AEC-Q101 qualified, as confirmed by the HM3 suffix and documentation in Vishay's ordering information table (page 3). It meets stress test requirements for automotive environments including temperature cycling, humidity testing, and mechanical shock - making it appropriate for body control modules, infotainment power supplies, and sensor interface protection in passenger vehicles and light trucks.
How does the bidirectional design of SMBJ17CAHM3_B/I affect its use in circuit protection?
The bidirectional design of SMBJ17CAHM3_B/I allows symmetrical clamping for both positive and negative transients without regard to polarity, enabling direct placement across AC-coupled lines like RS-485, CAN, or LIN buses. Unlike unidirectional TVS diodes, SMBJ17CAHM3_B/I requires no orientation during placement and provides equal protection on either side of ground - simplifying layout and eliminating polarity-related assembly errors.
What is the thermal resistance of SMBJ17CAHM3_B/I, and how does it impact PCB layout?
SMBJ17CAHM3_B/I 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 standard FR-4 board material and guides minimum pad area and copper pour requirements. To maintain TJ ≤ 150 °C under repetitive surge conditions, designers must ensure adequate copper area and avoid excessive ambient temperature rise - especially in enclosed enclosures.
Does SMBJ17CAHM3_B/I meet RoHS and halogen-free standards?
Yes, SMBJ17CAHM3_B/I carries the HM3 suffix, indicating it is both RoHS-compliant and halogen-free per Vishay's material categorization (document 99912). This satisfies strict environmental requirements for automotive Tier 1 suppliers and industrial OEMs mandating bromine/chlorine-free materials. The device uses matte tin-plated leads and UL 94 V-0 molding compound, fully documented in the mechanical data section of the datasheet.
SMBJ17CAHM3_B/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 21.7A
- 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)
SMBJ17CAHM3_B/I FAQ
1.How can I place an order for SMBJ17CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ17CAHM3_B/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 SMBJ17CAHM3_B/I reliable?
The price and inventory of SMBJ17CAHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ17CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ17CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ17CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ17CAHM3_B/I?
SMBJ17CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ17CAHM3_B/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 SMBJ17CAHM3_B/I?
For technical support, including SMBJ17CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ17CAHM3_B/I requirements.
6.How does Aetrix verify that SMBJ17CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ17CAHM3_B/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 SMBJ17CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ17CAHM3_B/I?
All SMBJ17CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ17CAHM3_B/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 SMBJ17CAHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ17CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ17CAHM3_B/I Tags
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