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Vishay General Semiconductor - Diodes Division SMBJ17AHM3/I
- Part No.:
- SMBJ17AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ17AHM3/I.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,769
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Product details
Overview
SMBJ17AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 17 V stand-off voltage (VWM), 18.9–20.9 V breakdown voltage (VBR) at 1 mA, 27.6 V maximum clamping voltage (VC) at 21.7 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed on power rails and signal lines of industrial sensor interfaces.
For engineers reviewing the SMBJ17AHM3/I datasheet, SMBJ17AHM3/I pinout, SMBJ17AHM3/I application, or SMBJ17AHM3/I equivalent, this part is selected for high-reliability transient suppression where low clamping voltage, AEC-Q101 qualification, halogen-free RoHS compliance, and stable thermal performance up to 150 °C junction temperature are required.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, responding within <1 ps to transients induced by inductive switching or ESD events. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and repeatable breakdown behavior across temperature (-55 °C to +150 °C).
The device is rated for 100 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), exhibits 0.090 %/°C temperature coefficient of VBR, and achieves 20 °C/W junction-to-lead thermal resistance - enabling effective heat dissipation when mounted on 5.0 mm × 5.0 mm copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin. |
| VBR (min/max) | 18.9 V / 20.9 V at IT = 1 mA - Confirmed avalanche onset range; ensures predictable turn-on under surge conditions. |
| VC @ IPPM | 27.6 V at 21.7 A - Clamped voltage during 600 W transient; limits downstream IC stress to safe levels. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; supports repetitive surges at 0.01 % duty cycle. |
| IFSM | 100 A - Single half-sine surge current rating (8.3 ms); validates robustness against motor-switching transients. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or industrial enclosures. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated SMT placement. |
Pinout & Package
Package: SMB (DO-214AA), molded case with matte tin-plated leads, MSL Level 1 (260 °C peak reflow), halogen-free and RoHS-compliant (HM3 suffix). Polarity indicated by cathode band; anode and cathode terminals defined per standard SMB orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-impedance return path; forms current sink during clamping. |
| Cathode | Protected line input | Connected to supply rail or signal line; absorbs transient energy into ground via avalanche conduction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control and ADAS modules. |
| Halogen-free & RoHS-compliant (HM3) | Meets IEC 61249-2-21 and JEDEC J-STD-20D; eliminates brominated flame retardants without compromising UL 94 V-0 flammability rating. |
| 600 W peak pulse power | Handles high-energy transients (e.g., ISO 7637-2 Pulse 1/2a/5a) without degradation when mounted per recommended pad layout. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage stress on protected ICs - critical for 3.3 V or 5 V logic interfaces with tight VDD margins. |
| Fast response time (<1 ps) | Clamps before transient propagates through PCB traces - preserves signal integrity on high-speed sensor or CAN bus lines. |
Applications
| Industrial Sensor Interface Protection | Automotive Power Rail Clamp |
|---|---|
|
Use Scenario: Protecting 4–20 mA current-loop transmitters and analog sensor outputs from load-dump and inductive kickback in factory automation systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor output and system ground to shunt surge current away from precision ADC front-end. Use Value: Limits clamped voltage to ≤27.6 V, preventing latch-up or damage to 24 V-rated op-amps and isolators while maintaining signal fidelity. |
Use Scenario: Suppressing load-dump transients (ISO 16750-2) on 12 V battery-fed ECUs in passenger vehicles and commercial trucks. IC Role / Device Role / Timing Role: Primary clamping device on main power input, coordinated with upstream fuse and downstream DC-DC converter. Use Value: Withstands 100 A surge (8.3 ms) and clamps to 27.6 V, ensuring downstream regulators remain within absolute maximum ratings during 35 V/100 ms events. |
| Telecom Line Surge Guard | Consumer Device ESD Shield |
|
Use Scenario: Safeguarding Ethernet PHY interface power pins and bias rails against lightning-induced surges in outdoor network equipment. IC Role / Device Role / Timing Role: Standoff-rated TVS on PoE injector side, absorbing common-mode transients before they reach magnetics or controller ICs. Use Value: 17 V VWM allows clean operation under 12 V/24 V PoE voltages; 600 W rating meets ITU-T K.21 basic protection level requirements. |
Use Scenario: Adding secondary-level ESD protection to USB-C port VBUS and CC lines in portable audio devices and smart home hubs. IC Role / Device Role / Timing Role: Secondary clamp after primary polymer PTC or integrated ESD array, catching residual fast transients missed by on-die protection. Use Value: Sub-30 V clamping voltage prevents overstress of USB PD controllers rated for 28 V absolute max, while SMB footprint minimizes board area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ17AHE3/I | Same electrical specs, but RoHS-compliant with lead-based solder compatibility (E3 suffix); not halogen-free. | Lacks halogen-free certification; unsuitable for strict environmental compliance programs (e.g., EU automotive Tier 1). | Select when legacy solder process compatibility is prioritized over halogen-free requirements. |
| SMBJ17CAHM3/I | Bidirectional variant; symmetric VBR (18.9–20.9 V), same VC and PPPM; no polarity marking. | Required for AC-coupled or differential signal lines (e.g., RS-485, CAN FD) where reverse polarity transients occur. | Choose only if bidirectional clamping is needed; unidirectional SMBJ17AHM3/I offers lower leakage and tighter VBR tolerance. |
Compared with SMBJ17AHE3/I, SMBJ17AHM3/I provides halogen-free compliance without sacrificing clamping performance or thermal capability; versus SMBJ17CAHM3/I, it delivers superior reverse leakage control and optimized unidirectional surge handling for DC power rails.
Availability
SMBJ17AHM3/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive power rail clamping, telecom surge protection, and consumer ESD shielding requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ17AHM3/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure resilience and regulatory compliance are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ17AHM3/I at its rated peak pulse current?
The SMBJ17AHM3/I has a maximum clamping voltage (VC) of 27.6 V at its specified peak pulse current (IPPM) of 21.7 A, measured using the standard 10/1000 µs waveform. This value is guaranteed per Vishay's datasheet revision 09-Jan-2024 (Document Number: 88392) and reflects worst-case performance under defined test conditions. The SMBJ17AHM3/I maintains this clamping level across its operational temperature range, making it suitable for protecting 24 V systems where overvoltage headroom must stay below 30 V.
Is SMBJ17AHM3/I qualified for automotive applications?
Yes, SMBJ17AHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in the SMBJ5.0A–SMBJ188A datasheet. This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD (HBM ≥ 8 kV). The SMBJ17AHM3/I is explicitly designated for automotive use in engine control units, body electronics, and ADAS subsystems where reliability under thermal and electrical stress is critical.
What does the "HM3" suffix indicate in SMBJ17AHM3/I?
The "HM3" suffix in SMBJ17AHM3/I denotes halogen-free, RoHS-compliant construction with matte tin-plated leads, meeting JESD201 Class 2 whisker resistance and UL 94 V-0 flammability standards. It distinguishes the part from "E3" (RoHS-compliant but lead-containing) and "HE3/HM3_X" (AEC-Q101 qualified variants). The "I" indicates 13-inch tape-and-reel packaging (3200 units per reel), while "HM3" confirms full environmental compliance without compromising electrical or thermal performance of the SMBJ17AHM3/I.
How does SMBJ17AHM3/I differ from SMBJ17CAHM3/I?
SMBJ17AHM3/I is unidirectional, with cathode-band polarity and asymmetric conduction (forward-biased like a rectifier), whereas SMBJ17CAHM3/I is bidirectional - offering identical clamping in both directions and no polarity marking. Electrically, both share VWM = 17 V, VBR = 18.9–20.9 V, and VC = 27.6 V, but SMBJ17AHM3/I exhibits lower reverse leakage (<1.0 µA vs. ≤2.0 µA for bidirectional types at VWM). Use SMBJ17AHM3/I for DC power rails; choose SMBJ17CAHM3/I only for AC or differential signal paths like CAN or RS-485.
What is the thermal resistance specification for SMBJ17AHM3/I?
The SMBJ17AHM3/I has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W and a junction-to-ambient resistance (RθJA) of 100 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. These values enable accurate thermal modeling in PCB layouts - for example, at 5.0 W steady-state dissipation, junction temperature rise above ambient would be ~500 °C without heatsinking, confirming that SMBJ17AHM3/I is intended for pulsed, not continuous, power dissipation.
SMBJ17AHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ17AHM3/I FAQ
1.How can I place an order for SMBJ17AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ17AHM3/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 SMBJ17AHM3/I reliable?
The price and inventory of SMBJ17AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ17AHM3/I is usually 5 days.
3.What payment methods are accepted for SMBJ17AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ17AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ17AHM3/I?
SMBJ17AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ17AHM3/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 SMBJ17AHM3/I?
For technical support, including SMBJ17AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ17AHM3/I requirements.
6.How does Aetrix verify that SMBJ17AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ17AHM3/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 SMBJ17AHM3/I meets industry standards.
7.What is the process for return or replacement of SMBJ17AHM3/I?
All SMBJ17AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ17AHM3/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 SMBJ17AHM3/I part is unused and in its original packaging.
Return procedure for SMBJ17AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ17AHM3/I Tags
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