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Vishay General Semiconductor - Diodes Division SMBJ26AHM3_B/I
- Part No.:
- SMBJ26AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ26AHM3_B/I.pdf
- Description:
- 600W,26V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,705
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Product details
Overview
SMBJ26AHM3_B/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 26 V stand-off voltage (VWM), 28.9–31.9 V breakdown voltage (VBR) at 1 mA, 42.1 V maximum clamping voltage (VC) at 14.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMBJ26AHM3_B/I datasheet, SMBJ26AHM3_B/I pinout, SMBJ26AHM3_B/I application, or SMBJ26AHM3_B/I equivalent, key selection considerations include its AEC-Q101 qualification status (halogen-free, RoHS-compliant), low incremental surge resistance, fast response time, and suitability for automotive, industrial, and telecom signal-line protection where robust ESD and surge immunity are required.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, leveraging a glass-passivated silicon junction for stable avalanche behavior under transient overvoltage events. Its thermal resistance (RθJA = 100 °C/W) and junction-to-lead resistance (RθJL = 20 °C/W) support reliable operation up to 150 °C junction temperature, with derating applied above 25 °C ambient per Figure 2.
The SMBJ26AHM3_B/I delivers precise clamping performance: at 14.3 A IPPM (10/1000 µs), it limits voltage to ≤42.1 V while maintaining <1.0 µA reverse leakage at 26 V VWM. Its temperature coefficient of VBR is +0.097 %/°C, enabling predictable voltage shift across operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 24 V nominal systems. |
| VBR (min/max) | 28.9 V / 31.9 V at 1 mA - Confirmed breakdown threshold ensures reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 42.1 V at 14.3 A - Clamped voltage under 600 W 10/1000 µs surge; determines protected circuit's maximum stress level. |
| PPPM | 600 W - Peak pulse power handling capability; supports repetitive surge events at 0.01 % duty cycle. |
| IFSM | 100 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against high-energy inrush. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive and industrial environments. |
| Package | SMB (DO-214AA) - Surface-mount footprint (5.21 mm × 4.06 mm × 2.20 mm) compatible with automated placement and J-STD-020 MSL Level 1 reflow. |
Pinout & Package
Package: SMB (DO-214AA), molded case with matte tin-plated leads, cathode indicated by band marking on unidirectional devices. Complies with UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-potential node; completes clamping path when transient exceeds VBR. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., CAN_H, USB_VBUS, sensor supply); absorbs positive transients toward ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensors; meets stress test requirements for temperature cycling, HTRB, and surge. |
| Halogen-free & RoHS-compliant | HM3 suffix denotes halogen-free molding compound and lead finish, satisfying EU Directive 2011/65/EU and automotive material compliance standards. |
| 600 W peak pulse power | Handles IEC 61000-4-5 Level 4 (4 kV line-to-earth) surges without degradation when mounted on 5.0 mm × 5.0 mm copper pads. |
| Fast response time | Sub-nanosecond clamping onset ensures protection of high-speed interfaces (e.g., LIN, SENT, RS-485) before IC damage occurs. |
| Low clamping ratio | VC/VBR ≈ 1.37 - Tight voltage margin between breakdown and clamping improves system-level surge margin versus competing TVS devices. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply rails in body control modules against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input to clamp transients before regulator input stage. Use Value: Withstands 100 A IFSM and clamps to ≤42.1 V, preventing overvoltage failure of downstream PMICs and microcontrollers. |
Use Scenario: Shielding analog output lines (4–20 mA) of pressure/temperature transmitters from EFT and surge coupling. IC Role / Device Role / Timing Role: TVS connected across signal and return lines to shunt transient energy away from precision amplifier inputs. Use Value: Low leakage (<1 µA at 26 V) avoids signal offset errors; 42.1 V clamping preserves ADC input integrity during 1 kV EFT bursts. |
| Telecom Data Line Surge Suppression | Consumer Device USB Port Protection |
|
Use Scenario: Safeguarding RS-485 transceivers in base station backhaul links exposed to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Paired unidirectional TVS on A/B differential lines referenced to local ground, absorbing common-mode transients. Use Value: 600 W rating and 14.3 A IPPM meet ITU-T K.21 Basic Protection Level for outdoor telecom equipment. |
Use Scenario: Adding secondary surge defense on USB VBUS lines of smart home hubs after primary fuse and polymer PTC. IC Role / Device Role / Timing Role: Final-stage clamping device limiting VBUS overshoot during hot-plug ESD events and AC-coupled surges. Use Value: Fast response and 26 V VWM allow coexistence with 5 V tolerant USB PHYs while blocking >30 V transients before damage occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ26AHE3_B/I | Same electrical specs but RoHS-compliant (E3) instead of halogen-free (HM3); no AEC-Q101 qualification. | Preferred for commercial-grade industrial controls where automotive qualification is not required. | Select when halogen-free content is not mandated and AEC-Q101 testing is unnecessary. |
| SMAJ26A-M3 | Lower 400 W PPPM, larger SMA package (DO-214AC), higher RθJA (140 °C/W), same VWM/VC ratings. | Suitable for cost-sensitive consumer designs with lower surge exposure and less stringent thermal constraints. | Choose only if board space allows larger footprint and 400 W surge margin is sufficient for target threat model. |
Compared with SMBJ26AHM3_B/I, the SMBJ26AHE3_B/I offers identical protection performance without halogen-free or automotive qualification, while the SMAJ26A-M3 trades 33 % lower surge power and inferior thermal performance for lower unit cost and broader distributor availability.
Availability
SMBJ26AHM3_B/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom data interfaces, and consumer USB power protection requiring stable component supply with full traceability and lifecycle continuity.
Supply support for SMBJ26AHM3_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, MOSFETs, optoelectronics, and passive components 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 applications where AEC-Q101 validation, low clamping voltage, and repeatable surge endurance are critical design requirements.
FAQ
What is the clamping voltage of SMBJ26AHM3_B/I at its rated peak pulse current?
The SMBJ26AHM3_B/I has a maximum clamping voltage (VC) of 42.1 V at 14.3 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on the protected circuit during surge events and is measured with the device mounted on 0.2" × 0.2" copper pads per JEDEC standards. The SMBJ26AHM3_B/I maintains this clamping performance across its qualified operating temperature range.
Is SMBJ26AHM3_B/I suitable for automotive applications?
Yes, SMBJ26AHM3_B/I is AEC-Q101 qualified and specifically designed for automotive use. Its halogen-free (HM3) construction, 150 °C maximum junction temperature, and validated performance under temperature cycling, high-temperature reverse bias, and surge stress make it appropriate for under-hood and cabin modules. The SMBJ26AHM3_B/I meets requirements for engine control units, lighting drivers, and ADAS sensor interfaces where robust transient immunity is mandatory.
How does the SMBJ26AHM3_B/I differ from the SMBJ26A-E3 variant?
The SMBJ26AHM3_B/I uses a halogen-free, RoHS-compliant molding compound and lead finish, and carries AEC-Q101 qualification; the SMBJ26A-E3 is RoHS-compliant but not halogen-free and lacks AEC-Q101 validation. Both share identical electrical parameters (VWM = 26 V, VC = 42.1 V, PPPM = 600 W), but the HM3 suffix reflects stricter material compliance and automotive-grade reliability testing required for modern vehicle platforms. The SMBJ26AHM3_B/I is the preferred choice when halogen-free content and automotive qualification are specified.
What is the thermal resistance of SMBJ26AHM3_B/I, and how does it affect PCB layout?
The SMBJ26AHM3_B/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended pad layout (0.2" × 0.2" copper per terminal). To maintain safe junction temperatures under sustained power dissipation or repeated surges, designers must provide adequate copper area and consider airflow. For high-duty-cycle applications, thermal vias under the pads and internal ground/power planes significantly reduce effective RθJA. The SMBJ26AHM3_B/I's RθJL of 20 °C/W also supports heat transfer through the leads into adjacent traces.
Can SMBJ26AHM3_B/I be used for bidirectional transient suppression?
No, SMBJ26AHM3_B/I is a unidirectional TVS diode, intended for suppression of positive-going transients on circuits referenced to ground. Bidirectional protection requires a part with "CA" suffix (e.g., SMBJ26CA), which provides symmetrical clamping in both polarities. Using SMBJ26AHM3_B/I in bidirectional configurations risks failure during negative transients, as its anode cannot block reverse voltage beyond its small forward drop. Always match device polarity to the expected surge direction and grounding scheme in the target application.
SMBJ26AHM3_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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 14.3A
- 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)
SMBJ26AHM3_B/I FAQ
1.How can I place an order for SMBJ26AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ26AHM3_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 SMBJ26AHM3_B/I reliable?
The price and inventory of SMBJ26AHM3_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 SMBJ26AHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ26AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ26AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ26AHM3_B/I?
SMBJ26AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ26AHM3_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 SMBJ26AHM3_B/I?
For technical support, including SMBJ26AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ26AHM3_B/I requirements.
6.How does Aetrix verify that SMBJ26AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ26AHM3_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 SMBJ26AHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ26AHM3_B/I?
All SMBJ26AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ26AHM3_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 SMBJ26AHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ26AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ26AHM3_B/I Tags
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