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Vishay General Semiconductor - Diodes Division SMBJ26CAHM3_B/H
- Part No.:
- SMBJ26CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ26CAHM3_B/H.pdf
- Description:
- 600W,26V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,302
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Product details
Overview
SMBJ26CAHM3_B/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 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 - used to protect MOSFETs, ICs, and sensor interfaces in industrial motor drives.
For engineers reviewing the SMBJ26CAHM3_B/H datasheet, SMBJ26CAHM3_B/H pinout, SMBJ26CAHM3_B/H application, or SMBJ26CAHM3_B/H equivalent, this device is selected for robust ESD and surge protection where bidirectional clamping, low clamping ratio (VC/VWM ≈ 1.62), and AEC-Q101 qualification (via HM3 suffix) are required in automotive body electronics and industrial I/O modules.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping performance regardless of transient polarity. Its glass-passivated junction ensures stable VBR tolerance (±5%), low leakage (<1.0 µA at VWM), and fast response time (<1.0 ns), enabling protection of high-speed analog and digital signal paths without signal distortion.
The device complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (surge) standards when applied with appropriate PCB layout. Its MSL Level 1 rating (260 °C reflow peak) and halogen-free, RoHS-compliant construction (HM3 suffix) support automated SMT assembly in automotive-grade production environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR (min/max) | 28.9 V / 31.9 V at 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on before system damage occurs. |
| VC @ IPPM | 42.1 V at 14.3 A - Clamped voltage during 600 W 10/1000 µs surge; limits downstream stress to <42.1 V under worst-case transient. |
| PPPM | 600 W - Peak pulse power handling capability; supports repetitive surge events at 0.01% duty cycle without degradation. |
| IPPM | 14.3 A - Peak pulse current corresponding to 600 W into VC; determines minimum series impedance needed for coordination. |
| TJ max. | 150 °C - Maximum junction temperature; enables operation in under-hood or enclosed industrial enclosures without derating below 125 °C ambient. |
| Package | SMB (DO-214AA) - Standardized 2-pin SMD outline with 5.21 mm × 4.06 mm footprint; compatible with IPC-7351B land pattern. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Connects to protected line; conducts during negative transients and serves as reference node for symmetrical clamping. |
| Cathode | Transient return path (bidirectional) | Connects to protected line; conducts during positive transients; electrically identical to anode in CA devices. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges on 24 V bus lines without external current limiting. |
| Bidirectional clamping symmetry | Identical VBR, VC, and leakage in both directions eliminates need for polarity-aware placement in AC-coupled or floating signal paths. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including body control modules and sensor hubs requiring zero-defect reliability and extended temperature operation. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes overvoltage exposure to downstream ICs - critical for protecting 3.3 V or 5 V logic interfaced via level shifters or isolated drivers. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free reflow profiles without preconditioning; eliminates moisture sensitivity handling requirements in high-volume SMT lines. |
Applications
| Automotive Body Control Module | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protecting LIN bus transceivers and door module microcontrollers from load dump and inductive switching spikes in 12 V vehicle networks. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt transients before reaching PHY and MCU pins. Use Value: Maintains signal integrity during 100 V/50 ms load dump events while holding clamped voltage below 42.1 V - within absolute maximum ratings of ISO 17961-compliant transceivers. |
Use Scenario: Safeguarding 24 V DC digital input channels in programmable logic controllers against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Primary transient suppression element mounted adjacent to terminal block, coordinated with series impedance to limit IPPM. Use Value: Withstands repeated 1 kV/42 Ω surges per IEC 61000-4-5 without parameter drift, ensuring >10-year field reliability in factory automation environments. |
| Smart Sensor Signal Conditioning | DC Power Rail Protection |
Use Scenario: Shielding analog front-end circuitry (e.g., op-amps, ADCs) in industrial temperature/pressure sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance (typ. 100 pF at 0 V) TVS placed at sensor connector to minimize signal loading on mV-level outputs. Use Value: Sub-1 ns response time prevents ESD-induced latch-up in precision amplifiers; leakage <1 µA avoids offset errors in µA-biased sensor bridges. |
Use Scenario: Secondary overvoltage protection on regulated 24 V supply rails feeding motor drivers and communication ICs in embedded motion controllers. IC Role / Device Role / Timing Role: Fast-acting crowbar element that activates only during catastrophic upstream regulator failure or lightning-induced coupling. Use Value: Clamps rail to 42.1 V before downstream MOSFETs exceed VDS rating, preventing destructive avalanche and enabling graceful shutdown via supervisor IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ26CAHE3_B/H | Same electrical specs; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification. | Suitable for commercial/industrial use only; not approved for automotive production. | Select when halogen-free requirement or automotive qualification is not mandated. |
| SMAJ26CAHM3 | Lower PPPM (400 W); same VWM/VBR/VC; SMA (DO-214AC) package - smaller footprint (4.5 mm × 2.7 mm). | Used where board space is constrained and 400 W surge immunity suffices (e.g., consumer IoT nodes). | Choose for space-constrained designs accepting reduced surge margin; verify thermal dissipation with smaller pad area. |
Compared with SMBJ26CAHM3_B/H, the HE3 variant trades halogen-free and automotive qualification for cost savings in non-automotive settings, while the SMAJ26CAHM3 reduces footprint and power rating - making it viable only where 400 W surge capability meets system-level test requirements.
Availability
SMBJ26CAHM3_B/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, smart sensor interfaces, and 24 V DC power rail protection requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ26CAHM3_B/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 engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where consistent clamping performance and AEC-Q101 compliance are mandatory.
FAQ
What does the "CA" suffix indicate in SMBJ26CAHM3_B/H?
The "CA" suffix denotes a bidirectional configuration - meaning SMBJ26CAHM3_B/H provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional "A" variants, it has no cathode marking and delivers identical VBR, VC, and leakage characteristics in either polarity, making it ideal for AC signal lines, differential buses, or floating power domains where polarity cannot be assumed.
Is SMBJ26CAHM3_B/H suitable for protecting USB or Ethernet data lines?
No - SMBJ26CAHM3_B/H is not optimized for high-speed data line protection due to its typical junction capacitance of ~100 pF at 0 V, which would severely degrade signal integrity above ~10 MHz. It is intended for lower-frequency power and control signals (e.g., 24 V sensor inputs, LIN, CAN stubs). For USB 2.0 or Ethernet, purpose-built low-capacitance TVS arrays such as Vishay's USBxxCA or ESDxx series are recommended instead of SMBJ26CAHM3_B/H.
How does the HM3 suffix differ from E3 in SMBJ26CAHM3_B/H?
The HM3 suffix indicates halogen-free, RoHS-compliant construction plus AEC-Q101 qualification - verified for automotive-grade reliability, including extended temperature cycling, humidity testing, and mechanical shock. In contrast, the E3 suffix denotes RoHS compliance only, without halogen-free materials or automotive qualification. SMBJ26CAHM3_B/H therefore meets Tier-1 automotive supply chain requirements, whereas E3 variants are restricted to commercial/industrial use.
What is the maximum allowable printed circuit board pad size for SMBJ26CAHM3_B/H to achieve rated PPPM?
To achieve the full 600 W peak pulse power rating, SMBJ26CAHM3_B/H must be mounted on minimum recommended copper pads: 0.2" × 0.2" (5.0 mm × 5.0 mm) per terminal, as specified in Figure 2 of the datasheet. Smaller pads increase thermal resistance and reduce surge current handling - e.g., using 1.5 mm × 1.5 mm pads may limit IPPM to ~10 A instead of the rated 14.3 A, directly impacting protection margin in IEC 61000-4-5 testing.
Can SMBJ26CAHM3_B/H replace SMBJ24CAHM3_B/H in an existing design?
Yes - SMBJ26CAHM3_B/H can substitute for SMBJ24CAHM3_B/H if the system's maximum continuous operating voltage is ≥26 V and the clamping voltage margin remains acceptable. The VWM increases from 24 V to 26 V, VC rises from 38.9 V to 42.1 V, and IPPM decreases slightly (15.4 A → 14.3 A). Verify that downstream components tolerate the higher clamped voltage and that surge coordination with upstream fuses or PTCs remains effective under the new IPPM profile.
SMBJ26CAHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ26CAHM3_B/H FAQ
1.How can I place an order for SMBJ26CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ26CAHM3_B/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 SMBJ26CAHM3_B/H reliable?
The price and inventory of SMBJ26CAHM3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ26CAHM3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ26CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ26CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ26CAHM3_B/H?
SMBJ26CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ26CAHM3_B/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 SMBJ26CAHM3_B/H?
For technical support, including SMBJ26CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ26CAHM3_B/H requirements.
6.How does Aetrix verify that SMBJ26CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ26CAHM3_B/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 SMBJ26CAHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ26CAHM3_B/H?
All SMBJ26CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ26CAHM3_B/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 SMBJ26CAHM3_B/H part is unused and in its original packaging.
Return procedure for SMBJ26CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ26CAHM3_B/H Tags
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