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Vishay General Semiconductor - Diodes Division SMBJ17CAHM3_A/H
- Part No.:
- SMBJ17CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ17CAHM3_A/H.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,952
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Product details
Overview
SMBJ17CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for clamping voltage transients on signal or power lines. It features a 17 V standoff voltage (VWM), 18.9–20.9 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), and clamps to ≤27.6 V at 21.7 A peak surge current - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ17CAHM3_A/H datasheet, SMBJ17CAHM3_A/H pinout, SMBJ17CAHM3_A/H application, or SMBJ17CAHM3_A/H equivalent, this page delivers verified electrical specs, thermal derating behavior, clamping performance under standardized surge waveforms, and AEC-Q101-qualified halogen-free packaging options for automotive-grade reliability validation.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, IPPM, and VC values in forward and reverse directions. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1.0 ns), enabling robust protection against ESD (IEC 61000-4-2) and lightning-induced surges (IEC 61000-4-5).
Thermal design relies on RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.), requiring minimum 0.2" × 0.2" copper pads per terminal for rated 600 W pulse handling. The device is rated for TJ = –55 °C to +150 °C and meets MSL Level 1 (260 °C reflow peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - maximum continuous reverse/forward voltage before clamping begins; defines operating margin for 12–15 V nominal bus systems. |
| VBR (min/max) | 18.9 V / 20.9 V at IT = 1 mA - guaranteed breakdown threshold ensuring predictable turn-on during overvoltage events. |
| VC @ IPPM | ≤27.6 V at 21.7 A - clamped voltage during 10/1000 µs surge; limits stress on downstream ICs like RS-485 transceivers or MCU GPIOs. |
| PPPM | 600 W - peak pulse power rating with 0.01% duty cycle; supports repetitive surge immunity in motor drive or PoE applications. |
| ID @ VWM | ≤1.0 µA - ultra-low leakage ensures minimal standby power loss and signal integrity in high-impedance sensor circuits. |
| TJ max. | +150 °C - enables operation in under-hood automotive or industrial enclosures without derating below full power. |
| Package | SMB (DO-214AA) - surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated pick-and-place and J-STD-020 reflow profiles. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals function identically as anode/cathode depending on applied voltage polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as anode or cathode based on instantaneous voltage polarity; no fixed polarity designation. |
| Terminal 2 | Anode/Cathode (bidirectional) | Electrically identical to Terminal 1; forms symmetrical clamping path across protected line pair (e.g., RS-485 A/B). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of differential or AC-coupled lines (e.g., CAN, RS-485, Ethernet PHY) without polarity concerns. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) when mounted on recommended 5.0 mm × 5.0 mm copper pads. |
| AEC-Q101 qualified & halogen-free | Meets automotive reliability requirements; HM3 suffix confirms halogen-free, RoHS-compliant construction for Tier-1 supply chain compliance. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage exposure to protected ICs - critical for 3.3 V or 5 V logic interfacing with 12 V field buses. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; simplifies SMT manufacturing for high-volume industrial PCB assembly. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting analog output lines (4–20 mA) and digital I/O (CAN/LIN) in factory-floor pressure/temperature sensors exposed to relay switching noise. IC Role / Device Role / Timing Role: Bidirectional TVS placed across signal and ground to clamp ±1 kV EFT bursts and inductive kickback. Use Value: Prevents latch-up or gate oxide damage in op-amps and microcontrollers by limiting transient voltage to ≤27.6 V while maintaining <1 µA leakage at 17 V DC bias. |
Use Scenario: Safeguarding LIN bus transceivers and door module MCUs against load dump and jump-start transients in 12 V vehicle networks. IC Role / Device Role / Timing Role: Mounted between LIN data line and chassis ground to absorb 10/1000 µs surges up to 600 W without degradation. Use Value: AEC-Q101 qualification and +150 °C junction rating ensure long-term reliability in under-dash environments where ambient exceeds 85 °C. |
| Telecom Power over Ethernet | Consumer Appliance Motor Drive |
|
Use Scenario: Clamping induced surges on PoE (IEEE 802.3af/at) data pairs during hot-swap insertion or lightning-induced coupling in network switches. IC Role / Device Role / Timing Role: Paired bidirectionally across each twisted pair (e.g., pins 1–2 and 3–6) to suppress common-mode transients. Use Value: Symmetrical VBR and low capacitance (<100 pF typical) preserve signal integrity at 100 Mbps while meeting IEC 61000-4-5 surge immunity. |
Use Scenario: Suppressing back-EMF spikes from brushed DC motors in washing machines or HVAC blowers connected to MCU-based control boards. IC Role / Device Role / Timing Role: Placed across motor terminals to divert inductive energy away from H-bridge MOSFETs and gate drivers. Use Value: 600 W pulse rating handles repeated 100 A surge currents (IFSM-equivalent) during motor stall conditions without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ17CAHE3_A/H | Same electrical specs and SMB package, but RoHS-compliant commercial grade (non-AEC-Q101); uses standard tin plating instead of whisker-tested matte tin. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select SMBJ17CAHE3_A/H for cost-sensitive non-automotive applications requiring identical clamping performance. |
| SMAJ17CAHM3 | Lower 400 W PPPM rating, same VWM/VBR; SMA (DO-214AC) package has smaller 4.5 mm × 2.7 mm footprint and higher RθJA (150 °C/W). | Reduced surge handling capacity; limited to lower-energy transients or space-constrained layouts where 600 W is unnecessary. | Choose SMAJ17CAHM3 only when board area is critical and surge threat level is below IEC 61000-4-5 Level 3. |
Compared with SMBJ17CAHE3_A/H, the SMBJ17CAHM3_A/H adds AEC-Q101 qualification and whisker-resistant terminations for automotive use; versus SMAJ17CAHM3, it delivers 50% higher surge power in a slightly larger but thermally superior SMB package - critical for sustained industrial surge immunity.
Availability
SMBJ17CAHM3_A/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body electronics, and PoE-powered equipment requiring stable component supply with halogen-free, AEC-Q101-qualified TVS protection.
Supply support for SMBJ17CAHM3_A/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, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMBJ series was engineered for high-energy transient suppression in harsh environments - targeting industrial automation, automotive electronics, and telecom infrastructure where consistent clamping and long-term stability are mandatory.
FAQ
What is the clamping voltage of SMBJ17CAHM3_A/H at its rated peak pulse current?
The SMBJ17CAHM3_A/H clamps to a maximum of 27.6 V at its rated peak pulse current of 21.7 A (10/1000 µs waveform). This value is measured under standardized test conditions with 0.2" × 0.2" copper pads per terminal and represents the upper limit of voltage imposed on protected circuitry during a worst-case surge event. The SMBJ17CAHM3_A/H maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C.
Is SMBJ17CAHM3_A/H suitable for automotive applications?
Yes, SMBJ17CAHM3_A/H is AEC-Q101 qualified and built with halogen-free, RoHS-compliant materials (HM3 suffix), making it suitable for automotive body electronics, infotainment interfaces, and power distribution modules. Its +150 °C maximum junction temperature, MSL Level 1 rating, and whisker-tested matte tin terminations meet stringent automotive manufacturing and field reliability requirements - confirmed in Vishay's official qualification report for the HM3 variant of the SMBJ family.
How does the bidirectional design of SMBJ17CAHM3_A/H affect its placement on a PCB?
The SMBJ17CAHM3_A/H has no polarity marking and functions identically in both directions, so it can be placed across any two nodes requiring symmetrical overvoltage protection - such as differential signal pairs (RS-485, CAN) or AC-coupled lines. Unlike unidirectional TVS diodes, there is no cathode band to align; orientation is irrelevant. This simplifies layout, reduces BOM complexity, and eliminates risk of reverse installation during SMT assembly.
What is the maximum leakage current of SMBJ17CAHM3_A/H at its standoff voltage?
The SMBJ17CAHM3_A/H exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 17 V standoff voltage (VWM) and 25 °C ambient temperature. This ultra-low leakage ensures minimal impact on high-impedance sensor circuits or battery-powered systems, preserving signal accuracy and extending operational battery life. Leakage remains within specification up to +125 °C, with gradual increase governed by junction temperature effects documented in the Vishay SMBJ datasheet.
Can SMBJ17CAHM3_A/H replace a unidirectional TVS like SMBJ17A in an existing design?
No - SMBJ17CAHM3_A/H is bidirectional and cannot directly replace unidirectional SMBJ17A without circuit review. While both share identical VWM, VBR, and PPPM, the unidirectional part conducts only in reverse bias and blocks forward current, whereas SMBJ17CAHM3_A/H clamps in both directions. Substitution may cause unintended conduction in DC-biased lines; verify signal polarity, biasing, and system-level surge paths before interchange.
SMBJ17CAHM3_A/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:
- Obsolete
- 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_A/H FAQ
1.How can I place an order for SMBJ17CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ17CAHM3_A/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 SMBJ17CAHM3_A/H reliable?
The price and inventory of SMBJ17CAHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ17CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ17CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ17CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ17CAHM3_A/H?
SMBJ17CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ17CAHM3_A/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 SMBJ17CAHM3_A/H?
For technical support, including SMBJ17CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ17CAHM3_A/H requirements.
6.How does Aetrix verify that SMBJ17CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ17CAHM3_A/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 SMBJ17CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ17CAHM3_A/H?
All SMBJ17CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ17CAHM3_A/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 SMBJ17CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMBJ17CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ17CAHM3_A/H Tags
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