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Vishay General Semiconductor - Diodes Division SMBJ17CAHM3/H
- Part No.:
- SMBJ17CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ17CAHM3/H.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,736
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Product details
Overview
SMBJ17CAHM3/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 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/H datasheet, SMBJ17CAHM3/H pinout, SMBJ17CAHM3/H application, or SMBJ17CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), and thermal resistance (RθJA = 100 °C/W) under standard PCB pad layout.
Technical Context
This device operates as a voltage-clamping protector with symmetrical reverse/forward conduction behavior due to its bidirectional construction. It responds to transient overvoltages within picoseconds and maintains low dynamic impedance during surge events, enabling effective suppression of ESD, lightning-induced surges, and inductive switching spikes.
Rated for -55 °C to +150 °C junction temperature, it uses glass-passivated silicon junction technology and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. The HM3 suffix confirms halogen-free, RoHS-compliant, commercial-grade construction with AEC-Q101 qualification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 17 V - maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 18.9–20.9 V at 1 mA - guaranteed conduction onset range; ensures predictable turn-on during transients |
| VC (Clamping Voltage) | ≤27.6 V at IPPM = 21.7 A - peak voltage seen by protected circuit during 10/1000 µs surge; determines stress on downstream components |
| PPPM (Peak Pulse Power) | 600 W - maximum non-repetitive surge energy absorption capability under standardized 10/1000 µs waveform |
| ID (Reverse Leakage) | ≤1.0 µA at VWM - minimal standby current draw; critical for low-power sensor and battery-backed systems |
| RθJA | 100 °C/W - thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs derating above 25 °C ambient |
| Package | SMB (DO-214AA) - surface-mount outline with 5.59 mm max length, 4.06 mm max width, and 2.20 mm max height; compatible with automated pick-and-place |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals with cathode/anode indistinguishable in function. Terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Either terminal serves as anode or cathode depending on instantaneous polarity of transient; no fixed polarity |
| Terminal 2 | Anode / Cathode (bidirectional) | Paired terminal completing symmetrical clamping path; enables protection on AC or floating DC lines without orientation constraints |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal lines (e.g., RS-485, CAN bus) without polarity concerns |
| 600 W peak pulse power | Handles high-energy transients such as IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) when mounted per recommended pad layout |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive subsystems including body electronics and infotainment where reliability under thermal cycling and vibration is required |
| Halogen-free & RoHS-compliant | Meets environmental compliance mandates for industrial and consumer end equipment; supports lead-free reflow assembly |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time), improving protection margin for sensitive ICs |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
Use Scenario: Protecting analog output lines (4–20 mA) and digital I/O (I²C, SPI) of pressure/temperature sensors exposed to motor drive noise and relay switching. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed across signal and ground, shunting surge current away from precision ADCs and microcontroller GPIOs. Use Value: Limits transient voltage to ≤27.6 V during 21.7 A surges, preventing latch-up or gate oxide damage in connected ASICs. |
Use Scenario: Shielding Ethernet PHY interface and POTS line drivers from lightning-induced surges and EFT bursts in DSL/CPE equipment. IC Role / Device Role / Timing Role: Bidirectional transient suppressor installed at connector entry point, clamping both common-mode and differential-mode transients. Use Value: Symmetrical 18.9–20.9 V breakdown ensures equal protection regardless of surge polarity, eliminating need for dual unidirectional devices. |
| Automotive Body Control Module | Consumer Appliance Motor Drive |
Use Scenario: Safeguarding LIN bus transceivers and LED driver ICs in door module ECUs subjected to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: AEC-Q101-qualified TVS placed between LIN data line and chassis ground, absorbing repetitive 10/1000 µs transients. Use Value: 600 W rating and 150 °C max junction temperature support sustained operation in under-hood environments with thermal cycling. |
Use Scenario: Suppressing inductive kickback from brushed DC motors in washing machines and HVAC blowers connected to microcontroller-based control boards. IC Role / Device Role / Timing Role: Clamping diode bridging motor terminals to limit back-EMF spikes during PWM commutation and relay deactivation. Use Value: Low clamping voltage (≤27.6 V) prevents overvoltage stress on MOSFET half-bridge drivers and MCU reset circuits. |
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/H | Same electrical specs but RoHS-compliant (E3), non-halogen-free; lacks halogen-free certification | Suitable for commercial-grade designs where halogen-free requirement is not mandated | Select SMBJ17CAHE3/H if halogen-free compliance is not required and cost optimization is prioritized |
| SMAJ17CAHM3 | Lower 400 W PPPM rating; SMA package (smaller footprint, higher RθJA ≈ 140 °C/W) | Limited to lower-energy transients and space-constrained layouts where thermal margin permits | Choose SMAJ17CAHM3 only when board area is critical and surge exposure is below IEC 61000-4-5 Level 3 |
Compared with SMBJ17CAHE3/H, SMBJ17CAHM3/H adds halogen-free assurance without sacrificing clamping performance; versus SMAJ17CAHM3, it delivers 50 % higher surge power handling and superior thermal dissipation in the same mounting style.
Availability
SMBJ17CAHM3/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, and automotive body control modules requiring stable component supply with AEC-Q101 validation and halogen-free compliance.
Supply support for SMBJ17CAHM3/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, efficiency, and application-specific optimization.
The SMBJ series was developed for robust, surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where repeatable clamping and long-term stability are essential.
FAQ
What does the 'CA' suffix indicate in SMBJ17CAHM3/H?
The 'CA' suffix in SMBJ17CAHM3/H denotes a bidirectional Transient Voltage Suppressor. Unlike unidirectional variants (e.g., SMBJ17AHM3/H), this device provides symmetrical clamping in both polarities, making it ideal for AC signal lines, differential buses like RS-485, or any application where voltage transients may occur with either polarity. The SMBJ17CAHM3/H has identical electrical characteristics in forward and reverse directions.
Is SMBJ17CAHM3/H qualified for automotive use?
Yes, SMBJ17CAHM3/H is AEC-Q101 qualified, as confirmed by the 'HM3' suffix and Vishay documentation. This qualification validates its reliability under automotive-grade temperature cycling, mechanical shock, and humidity testing. It is suitable for non-safety-critical automotive applications including body electronics, infotainment, and lighting control modules - though not intended for safety-critical ADAS or powertrain functions unless explicitly validated.
How does SMBJ17CAHM3/H differ from SMBJ17A variants?
SMBJ17CAHM3/H is bidirectional with symmetrical clamping, while SMBJ17A variants are unidirectional and feature a cathode band marking. The unidirectional versions conduct only in reverse bias and block forward current, whereas SMBJ17CAHM3/H clamps equally in both directions. Additionally, SMBJ17CAHM3/H has no polarity marking, simplifying placement in AC-coupled designs where orientation is irrelevant.
What is the maximum clamping voltage for SMBJ17CAHM3/H at rated surge current?
The maximum clamping voltage (VC) for SMBJ17CAHM3/H is 27.6 V at a peak pulse current (IPPM) of 21.7 A, measured under the standard 10/1000 µs waveform. This value represents the highest voltage that will appear across the device during a full-rated surge event, directly defining the protection level afforded to downstream circuitry such as microcontrollers or communication transceivers.
Can SMBJ17CAHM3/H be used in place of a unidirectional TVS like SMBJ17AHM3/H?
SMBJ17CAHM3/H can replace SMBJ17AHM3/H only in applications where bidirectional clamping is acceptable or required - for example, on AC signal paths or floating differential lines. In DC circuits with defined polarity (e.g., +12 V power rail to ground), using SMBJ17CAHM3/H introduces unnecessary conduction during normal forward-biased operation, potentially causing leakage or malfunction. Always verify circuit topology before substitution.
SMBJ17CAHM3/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):
- 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/H FAQ
1.How can I place an order for SMBJ17CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ17CAHM3/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/H reliable?
The price and inventory of SMBJ17CAHM3/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/H is usually 5 days.
3.What payment methods are accepted for SMBJ17CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ17CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ17CAHM3/H?
SMBJ17CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ17CAHM3/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/H?
For technical support, including SMBJ17CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ17CAHM3/H requirements.
6.How does Aetrix verify that SMBJ17CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ17CAHM3/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/H meets industry standards.
7.What is the process for return or replacement of SMBJ17CAHM3/H?
All SMBJ17CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ17CAHM3/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/H part is unused and in its original packaging.
Return procedure for SMBJ17CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ17CAHM3/H Tags
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