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Vishay General Semiconductor - Diodes Division SMBJ26AHM3/I
- Part No.:
- SMBJ26AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ26AHM3/I.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,260
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Product details
Overview
SMBJ26AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed to protect sensitive electronics against ESD, lightning-induced surges, and inductive switching transients. 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/I datasheet, SMBJ26AHM3/I pinout, SMBJ26AHM3/I application, or SMBJ26AHM3/I equivalent, this device is selected for robust overvoltage protection on DC power rails and low-speed signal lines in industrial control modules, automotive body electronics, and sensor interface circuits where halogen-free, RoHS-compliant, and AEC-Q101-qualified components are required.
Technical Context
This unidirectional TVS diode operates as a voltage-clamping device that remains high-impedance below VWM = 26 V and rapidly transitions to low-impedance conduction above VBR (min 28.9 V), limiting transient energy to safe levels. Its 100 °C/W junction-to-ambient thermal resistance and 150 °C max junction temperature support operation in compact PCB layouts without forced cooling.
The SMBJ26AHM3/I uses a glass-passivated silicon junction for stable breakdown characteristics and fast response time (<1 ns), with 1.0 µA max reverse leakage at VWM and 0.097 %/°C temperature coefficient of VBR. It meets JESD201 Class 2 whisker resistance and MSL Level 1 reflow compatibility (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 24 V systems. |
| VBR (min/max) | 28.9 V / 31.9 V at IT = 1 mA - Confirmed breakdown range ensures reliable turn-on without premature conduction under normal operation. |
| VC @ IPPM | 42.1 V at 14.3 A - Clamping voltage limits downstream IC stress during 600 W surge events; critical for MOSFET gate or MCU I/O protection. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform supports common lightning and inductive load surge standards. |
| IPPM | 14.3 A - Peak surge current capacity derived from PPPM/VC; validates protection level for 24 V industrial bus transients. |
| TJmax | +150 °C - Enables use in under-hood automotive or high-temperature industrial enclosures without derating. |
| Package | SMB (DO-214AA) - Standardized 2-pin surface-mount outline with 5.21 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated placement. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional polarity indicated by cathode band. Matte tin-plated leads, solderable per J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-voltage reference; completes clamping path during transient events. |
| Cathode | High-side connection point | Connected to protected line (e.g., 24 V rail or signal); polarity marking ensures correct orientation in series with load. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge testing on 24 V supply lines without external current limiting. |
| Halogen-free, RoHS-compliant (HM3 suffix) | Meets EU Directive 2015/863 and IPC-1752A material declarations for environmentally regulated end equipment. |
| AEC-Q101 qualified | Validated for automotive applications including body control modules, lighting drivers, and sensor nodes requiring long-term reliability. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free assembly without moisture sensitivity concerns or pre-bake requirements. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for 3.3 V or 5 V logic interfaces downstream. |
Applications
| Industrial Motor Control | Automotive Body Electronics |
|---|---|
|
Use Scenario: Protection of 24 V DC input to PLC I/O modules against relay coil flyback and contact arcing. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input terminals to clamp negative-going transients to ground. Use Value: Limits voltage excursion to ≤42.1 V during 14.3 A surges, preventing damage to upstream rectifier diodes and downstream regulator ICs. |
Use Scenario: Overvoltage suppression on LIN bus power rail in door module ECUs exposed to battery dump and load-dump events. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between VBAT and GND to absorb 600 W pulses without degradation. Use Value: Maintains system uptime by surviving repeated 12 V/24 V load-dump transients per ISO 7637-2 Pulse 5a, enabled by AEC-Q101 qualification. |
| Industrial Sensor Interface | Telecom Power Supply Input |
|
Use Scenario: Transient protection on analog sensor supply line (e.g., 24 V loop-powered pressure transmitter) in factory automation. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 µA) TVS placed at connector entry point to shunt ESD and EFT bursts. Use Value: Preserves signal integrity with minimal offset error due to sub-µA reverse leakage at 26 V, avoiding measurement drift. |
Use Scenario: Secondary-side surge protection on 24 V output of telecom AC/DC adapter feeding remote radio units. IC Role / Device Role / Timing Role: Fast-response (sub-ns) clamping device absorbing induced lightning surges coupled via shared grounding. Use Value: Achieves <100 ns clamping latency and 42.1 V clamping ceiling, ensuring downstream DC-DC converters remain within absolute maximum ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ26AHE3/I | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | Acceptable where halogen content is unrestricted (e.g., commercial-grade industrial equipment). | Select when cost optimization is prioritized and halogen-free compliance is not mandated by end-customer specifications. |
| SMAJ26A-M3/5B | Lower 400 W PPPM, SMA package (smaller footprint, higher RθJA = 130 °C/W), same VWM/VC. | Suitable only for lower-energy transients or space-constrained designs where thermal margin allows. | Choose only if board area is critical and surge threat level is limited to IEC 61000-4-2 ±8 kV contact discharge, not full lightning immunity. |
Compared with SMBJ26AHM3/I, the HE3/I variant trades halogen-free status for slightly lower cost while retaining AEC-Q101 qualification, whereas the SMAJ26A-M3/5B reduces surge capability and thermal performance to fit smaller PCB footprints-neither offers pin-compatible replacement without layout or reliability reassessment.
Availability
SMBJ26AHM3/I is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and telecom power supply input protection requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for SMBJ26AHM3/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 and application-specific performance.
The SMBJ series was developed for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where consistent clamping behavior and long-term stability under surge stress are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ26AHM3/I under a 600 W surge?
The SMBJ26AHM3/I has a maximum clamping voltage (VC) of 42.1 V at 14.3 A peak pulse current, measured with a 10/1000 µs waveform. This value is guaranteed per Vishay's datasheet revision 09-Jan-2024 (Document Number: 88392). The SMBJ26AHM3/I maintains this clamping performance across its rated operating temperature range of -55 °C to +150 °C, making it suitable for protecting 24 V systems against standardized surge events.
Is SMBJ26AHM3/I qualified for automotive applications?
Yes, SMBJ26AHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure (HM3 suffix denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified variants). It is intended for use in automotive body electronics such as door modules, lighting controllers, and sensor nodes where reliability under thermal cycling and surge stress is critical. The SMBJ26AHM3/I undergoes stress testing per AEC-Q101 requirements including HTRB, HTGB, and surge endurance.
What does the "HM3" suffix indicate in SMBJ26AHM3/I?
The "HM3" suffix in SMBJ26AHM3/I specifies halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering documentation, HM3 devices meet JESD201 Class 2 whisker resistance and MSL Level 1 reflow profile (260 °C peak). This distinguishes SMBJ26AHM3/I from E3 (RoHS only) and HE3 (RoHS + AEC-Q101, not halogen-free) variants, ensuring compliance with strict environmental regulations in automotive and industrial markets.
Can SMBJ26AHM3/I be used in bidirectional protection circuits?
No, SMBJ26AHM3/I is a unidirectional TVS diode, identifiable by its cathode band marking and specified parameters (e.g., VF = 3.5 V max. at 50 A forward current). For bidirectional protection, Vishay offers the SMBJ26CA variant (with CA suffix), which provides symmetrical clamping in both polarities. Using SMBJ26AHM3/I in bidirectional configurations risks failure during positive transients on the anode side, as it lacks reverse conduction capability.
What is the thermal resistance of SMBJ26AHM3/I, and how does it affect PCB layout?
The SMBJ26AHM3/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 minimum recommended pad layout per Vishay's package drawing. To maintain TJ ≤ 150 °C during repetitive surges, designers must ensure adequate copper area and avoid excessive ambient temperatures; reducing pad size increases RθJA and risks thermal runaway. The SMBJ26AHM3/I's RθJL of 20 °C/W further supports heat transfer to PCB traces.
SMBJ26AHM3/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):
- 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/I FAQ
1.How can I place an order for SMBJ26AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ26AHM3/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/I reliable?
The price and inventory of SMBJ26AHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMBJ26AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ26AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ26AHM3/I?
SMBJ26AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ26AHM3/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/I?
For technical support, including SMBJ26AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ26AHM3/I requirements.
6.How does Aetrix verify that SMBJ26AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ26AHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMBJ26AHM3/I?
All SMBJ26AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ26AHM3/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/I part is unused and in its original packaging.
Return procedure for SMBJ26AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ26AHM3/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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