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Vishay General Semiconductor - Diodes Division SMBJ26D-M3/H
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- Part No.:
- SMBJ26D-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ26D-M3/H.pdf
- Description:
- TVS DIODE 26VWM 41.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,929
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Product details
Overview
SMBJ26D-M3/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 26 V stand-off voltage (VWM), 29.3–31.5 V breakdown voltage (VBR) at 1 mA, 41.6 V maximum clamping voltage (VC) at 14.5 A peak pulse current (IPPM), and 600 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ26D-M3/H datasheet, SMBJ26D-M3/H pinout, SMBJ26D-M3/H application, or SMBJ26D-M3/H equivalent, key selection criteria include unidirectional polarity, ±3.5 % VBR tolerance, low leakage (<0.5 μA at VWM), MSL Level 1 moisture sensitivity, and halogen-free RoHS-compliant construction per JESD 201 Class 2 whisker test.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, entering avalanche conduction when reverse voltage exceeds VBR. Its low incremental surge resistance ensures minimal voltage overshoot during transient events, while fast response time (<1 ns) enables protection against ESD and inductive switching spikes.
The SMBJ26D-M3/H is rated for 150 °C maximum junction temperature and derates linearly above 25 °C ambient, with thermal resistance RθJA = 125 °C/W on minimum pad layout and RθJM = 20 °C/W to mounting surface - critical for sustained surge handling in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - maximum continuous reverse operating voltage before significant leakage; defines safe DC/AC working range. |
| VBR min/max | 29.3 V / 31.5 V at 1 mA - tight ±3.5 % tolerance ensures predictable turn-on across production lots. |
| VC @ IPPM | 41.6 V at 14.5 A - clamping voltage under 10/1000 μs surge; limits stress on downstream components. |
| PPPM | 600 W - peak pulse power capability with 0.01 % duty cycle; supports repetitive transient suppression. |
| ID @ VWM | <0.5 μA - ultra-low reverse leakage preserves signal integrity and minimizes standby power loss. |
| Package | SMB (DO-214AA) - standardized surface-mount outline with cathode band marking; compatible with automated placement. |
| MSL Level | Level 1 per J-STD-020 - no floor life limitation; supports standard reflow without dry pack or baking. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, cathode indicated by band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection in unidirectional configuration | Connected to ground or low-impedance return path; completes clamping loop during overvoltage event. |
| Cathode (banded end) | High-side connection in unidirectional configuration | Connected to protected line (e.g., 24 V rail or signal input); blocks normal operation, conducts during surge. |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables precise clamping threshold control across temperature and lot variations - critical for margin-critical 24 V systems. |
| 600 W peak pulse power (10/1000 μs) | Handles high-energy transients from relay coil decay or motor commutation without degradation. |
| Low incremental surge resistance | Minimizes VC rise during fast surges - improves protection margin for 3.3 V or 5 V logic interfaces downstream. |
| Halogen-free, RoHS-compliant, M3 grade | Meets industrial environmental requirements and JESD 201 Class 2 whisker resistance for long-term reliability. |
| MSL Level 1, 260 °C peak reflow | Eliminates pre-bake steps and simplifies SMT process integration in high-volume manufacturing. |
Applications
| Industrial PLC I/O Protection | 24 V DC Power Rail Protection |
|---|---|
|
Use Scenario: Protecting digital input modules from field-wiring induced transients in factory automation cabinets. IC Role / Device Role / Timing Role: Unidirectional TVS placed between terminal block and optocoupler input, clamping negative-going spikes to ground. Use Value: Prevents false triggering or latch-up of microcontroller inputs during solenoid switching, leveraging 26 V VWM alignment with standard 24 V nominal supply. |
Use Scenario: Safeguarding DC-DC converter inputs against load dump and inductive kickback in control panels. IC Role / Device Role / Timing Role: Parallel-connected TVS on 24 V bus upstream of regulator, conducting surge energy away from sensitive converters. Use Value: 41.6 V clamping voltage ensures downstream 36 V-rated components remain within safe operating area during 10/1000 μs surges up to 14.5 A. |
| Automotive Body Control Module Sensors | RS-485 Communication Line Protection |
|
Use Scenario: Shielding analog sensor inputs (e.g., temperature, pressure) from battery line transients in vehicle body electronics. IC Role / Device Role / Timing Role: Unidirectional TVS on sensor supply line, referenced to chassis ground, suppressing positive transients only. Use Value: Tight VBR tolerance and low leakage preserve sensor accuracy while meeting ISO 7637-2 Pulse 1/2a immunity requirements. |
Use Scenario: Protecting RS-485 transceiver data lines (A/B) from ESD and cable discharge events in building automation networks. IC Role / Device Role / Timing Role: Paired SMBJ26D-M3/H devices (one per line) referenced to local ground, clamping differential and common-mode surges. Use Value: Sub-1 ns response time prevents data corruption during 8 kV contact ESD events, validated per IEC 61000-4-2 Level 4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ26A | Same VWM (26 V), but wider VBR tolerance (±5 %); 43.5 V VC at 13.7 A; SMA package (larger footprint, higher RθJA). | Less precise clamping threshold; lower surge current rating; requires larger PCB area. | Select when cost sensitivity outweighs clamping precision and board space is unconstrained. |
| ON Semiconductor SMCJ26A | Same VWM (26 V), identical VBR range (29.3–31.5 V), but SMC package (DO-214AB); 43.5 V VC at 13.7 A; RθJA = 110 °C/W. | Higher thermal resistance reduces sustained surge capability; larger footprint than SMB. | Choose only if existing design uses SMC footprint or requires higher power dissipation margin at elevated ambient. |
Compared with SMBJ26D-M3/H, SMAJ26A offers lower cost but looser VBR control and larger size, while SMCJ26A provides identical electrical specs but demands more PCB area and has reduced thermal performance - making SMBJ26D-M3/H optimal for space-constrained, precision-clamping 24 V industrial designs.
Availability
SMBJ26D-M3/H is available at Aetrix Electronics and suitable for industrial PLC I/O protection, 24 V DC power rail hardening, and RS-485 communication line safeguarding requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ26D-M3/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, TVS devices, and power MOSFETs with emphasis on reliability and application-specific performance.
The SMBJ series was developed for robust, surface-mount transient suppression in harsh industrial and automotive environments - delivering tight tolerances, high surge ratings, and qualified material sets for mission-critical protection.
FAQ
What is the polarity configuration of SMBJ26D-M3/H?
SMBJ26D-M3/H is a unidirectional transient voltage suppressor diode, meaning it conducts only in reverse bias above its breakdown voltage. The cathode is marked by a band on the SMB package body, and it must be connected toward the protected line (e.g., 24 V rail), with the anode tied to ground. This configuration blocks forward current during normal operation while clamping negative transients to ground.
Does SMBJ26D-M3/H meet automotive qualification standards?
SMBJ26D-M3/H is not AEC-Q200 qualified, but it meets industrial-grade reliability requirements including MSL Level 1, JESD 201 Class 2 whisker resistance, and UL 497B recognition. It is widely deployed in automotive body electronics where full AEC-Q200 is not mandated - such as non-safety-critical sensor interfaces - provided system-level validation confirms compliance with ISO 7637-2 transient immunity.
What is the maximum clamping voltage of SMBJ26D-M3/H under surge conditions?
The maximum clamping voltage (VC) of SMBJ26D-M3/H is 41.6 V, measured at 14.5 A peak pulse current (IPPM) using the standard 10/1000 μs double-exponential waveform. This value represents the upper limit of voltage seen by downstream circuitry during worst-case surge events and is critical for ensuring protected components remain within their absolute maximum ratings.
Can SMBJ26D-M3/H be used in bidirectional applications?
No - SMBJ26D-M3/H is strictly unidirectional. For bidirectional transient suppression (e.g., AC lines or differential data buses), Vishay offers the SMBJ26CD variant, which lacks a cathode band and conducts symmetrically in both directions. Using SMBJ26D-M3/H in bidirectional configurations risks permanent failure due to forward conduction during normal signal swings.
What is the thermal resistance of SMBJ26D-M3/H on standard PCB layout?
On the minimum recommended copper pad layout (per Vishay datasheet), SMBJ26D-M3/H exhibits a typical junction-to-ambient thermal resistance (RθJA) of 125 °C/W. This value governs steady-state power dissipation limits and surge recovery behavior - for example, at 1.0 W ambient-rated power, junction temperature rise reaches 125 °C above ambient, necessitating derating above 25 °C per Figure 2 in the datasheet.
SMBJ26D-M3/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 26V
- Voltage - Breakdown (Min):
- 29.3V
- Voltage - Clamping (Max) @ Ipp:
- 41.6V
- Current - Peak Pulse (10/1000µs):
- 14.5A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ26D-M3/H FAQ
1.How can I place an order for SMBJ26D-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ26D-M3/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 SMBJ26D-M3/H reliable?
The price and inventory of SMBJ26D-M3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ26D-M3/H is usually 5 days.
3.What payment methods are accepted for SMBJ26D-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ26D-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ26D-M3/H?
SMBJ26D-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ26D-M3/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 SMBJ26D-M3/H?
For technical support, including SMBJ26D-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ26D-M3/H requirements.
6.How does Aetrix verify that SMBJ26D-M3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ26D-M3/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 SMBJ26D-M3/H meets industry standards.
7.What is the process for return or replacement of SMBJ26D-M3/H?
All SMBJ26D-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ26D-M3/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 SMBJ26D-M3/H part is unused and in its original packaging.
Return procedure for SMBJ26D-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ26D-M3/H Tags
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