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Vishay General Semiconductor - Diodes Division SMBJ26CAHM3_A/H
- Part No.:
- SMBJ26CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ26CAHM3_A/H.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMBJ26CAHM3_A/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 (IPPM), and 600 W peak pulse power (10/1000 µs waveform), used to protect MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMBJ26CAHM3_A/H datasheet, SMBJ26CAHM3_A/H pinout, SMBJ26CAHM3_A/H application, or SMBJ26CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.42), AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped avalanche diode, responding within <1 ps to transient overvoltages and limiting reverse voltage across protected circuit nodes. Its bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity constraints.
The SMBJ26CAHM3_A/H exhibits a temperature coefficient of VBR at +0.097 %/°C, ensuring stable breakdown behavior across its -55 °C to +150 °C operating junction range. Its 20 °C/W junction-to-lead thermal resistance supports reliable surge energy dissipation when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin below breakdown. |
| VBR min/max | 28.9 V / 31.9 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during transients. |
| VC @ IPPM | 42.1 V at 14.3 A - Clamped voltage under 10/1000 µs surge; determines maximum stress imposed on downstream components. |
| PPPM | 600 W - Peak pulse power handling (10/1000 µs); defines single-event surge robustness in automotive/industrial environments. |
| ID @ VWM | 1.0 µA - Reverse leakage at stand-off voltage; low value minimizes standby power loss and signal distortion. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in high-ambient industrial enclosures or under PCB heat buildup. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with JEDEC MS-012AC. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, MSL Level 1 (260 °C reflow peak), UL 94 V-0 rated compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; cathode-defined polarity reference point | For bidirectional devices like SMBJ26CAHM3_A/H, anode and cathode are symmetrical; no polarity marking on body - terminals interchangeable for AC transient suppression. |
| Cathode | Current exit terminal in forward bias; conventional reference for unidirectional variants | Not functionally distinct in SMBJ26CAHM3_A/H; both terminals behave identically under positive or negative transients due to bidirectional construction. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables symmetric protection of AC signals, differential buses (e.g., RS-485), or ungrounded power rails without external polarity management. |
| 600 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth) when properly laid out, supporting industrial-grade EMC compliance. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain and chassis applications where reliability under thermal cycling and mechanical shock is mandatory. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declarations; supports green manufacturing and end-of-life recycling requirements. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage overshoot during clamping, reducing risk of latch-up or gate oxide damage in protected MOSFETs and logic ICs. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and current-sense amplifiers against inductive kickback from 24 V DC solenoids and relay coils. IC Role / Device Role / Timing Role: Voltage-clamping element placed directly across driver output or sense node to limit transient excursions to ≤42.1 V. Use Value: Prevents destructive overvoltage on 30 V-rated MOSFETs and rail-to-rail op-amps by clamping within 1.6× VWM, enabling use of lower-voltage, cost-optimized components. |
Use Scenario: ESD and load-dump surge suppression on LIN bus transceivers and window motor control inputs in door modules. IC Role / Device Role / Timing Role: Bidirectional TVS connected between LIN data line and ground, absorbing ±30 kV HBM ESD and 12 V load-dump spikes. Use Value: Maintains signal integrity during ISO 10605 testing while meeting AEC-Q101 qualification, eliminating need for secondary protection stages. |
| Telecom Power Supply Inputs | Consumer Sensor Signal Conditioning |
|
Use Scenario: Input-stage protection for 24–48 V telecom DC-DC converters exposed to lightning-induced surges on PoE or remote power feeds. IC Role / Device Role / Timing Role: Primary surge clamp placed upstream of input filter capacitors and controller ICs to shunt >10 A transients. Use Value: Limits input rail overshoot to 42.1 V during 600 W surges, preventing controller latch-up and capacitor overvoltage failure without derating converter input range. |
Use Scenario: Protection of analog outputs from MEMS accelerometers and environmental sensors in smart home hubs against board-level ESD events. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ ≈ 200 pF at 0 V) placed at sensor output pin to suppress ±8 kV contact discharge per IEC 61000-4-2. Use Value: Adds <0.5 ns delay and <1% gain error to mV-level sensor signals while providing full-system ESD immunity without active circuitry. |
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_A/H | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | Preferred for commercial-industrial designs where halogen content is unrestricted but automotive qualification is required. | Select when halogen-free requirement is absent and cost optimization is prioritized over green material mandates. |
| SMAJ26CAHM3 | Lower PPPM (400 W vs. 600 W); SMA package (smaller footprint, higher RθJA = 140 °C/W). | Suitable for space-constrained consumer PCBs with lower surge exposure; not recommended for industrial 4 kV IEC 61000-4-5 compliance. | Choose only if board area is critical and surge threat level is limited to IEC 61000-4-2 ESD, not lightning or inductive switching. |
Compared with SMBJ26CAHM3_A/H, the HE3 variant trades halogen-free status for slightly lower cost while retaining AEC-Q101 qualification, whereas the SMAJ26CAHM3 sacrifices 33 % pulse power headroom and thermal performance for 30 % smaller footprint - making SMBJ26CAHM3_A/H optimal for high-reliability, high-energy transient environments.
Availability
SMBJ26CAHM3_A/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power supply inputs, and consumer sensor signal conditioning requiring stable component supply across multi-year production cycles.
Supply support for SMBJ26CAHM3_A/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, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade validation.
The SMBJ series is engineered for robust transient suppression in harsh environments, targeting design-in across automotive, industrial automation, and infrastructure power systems where surge immunity and long-term stability are critical.
FAQ
What is the clamping voltage of SMBJ26CAHM3_A/H at its rated peak pulse current?
The SMBJ26CAHM3_A/H has a maximum clamping voltage (VC) of 42.1 V at its rated peak pulse current (IPPM) of 14.3 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The SMBJ26CAHM3_A/H maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C), with minimal drift due to its +0.097 %/°C VBR temperature coefficient.
Is SMBJ26CAHM3_A/H suitable for automotive applications?
Yes, SMBJ26CAHM3_A/H is AEC-Q101 qualified, as confirmed by its HM3 suffix and Vishay's official ordering information. It meets stress test requirements for temperature cycling, mechanical shock, and high-temperature reverse bias, making it suitable for under-hood and chassis-mounted automotive subsystems including body control modules, lighting drivers, and infotainment power supplies. The SMBJ26CAHM3_A/H also complies with halogen-free and RoHS directives required for modern vehicle platforms.
How does the bidirectional configuration of SMBJ26CAHM3_A/H affect its circuit implementation?
The bidirectional configuration of SMBJ26CAHM3_A/H eliminates polarity sensitivity, allowing direct placement across any two nodes subject to bipolar transients - such as differential signal pairs (RS-485, CAN), AC power inputs, or floating sensor outputs. Unlike unidirectional TVS diodes, SMBJ26CAHM3_A/H requires no orientation check during assembly and provides identical clamping behavior for both positive and negative surges. Its symmetrical structure ensures consistent VC and IPPM regardless of voltage polarity, simplifying layout and reducing BOM complexity.
What is the thermal resistance profile of SMBJ26CAHM3_A/H, and how does it impact PCB layout?
SMBJ26CAHM3_A/H has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W and junction-to-ambient (RθJA) of 100 °C/W when mounted on the minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To sustain repeated 600 W surges, PCB layout must provide adequate copper area and thermal vias to minimize localized heating. Reducing RθJA via enhanced copper pours directly extends surge endurance and prevents thermal runaway during duty-cycle-limited repetitive events.
Does SMBJ26CAHM3_A/H meet industry-standard surge immunity requirements like IEC 61000-4-5?
Yes, SMBJ26CAHM3_A/H is rated for 600 W peak pulse power with a 10/1000 µs waveform - the standard test condition for IEC 61000-4-5 Level 4 (4 kV line-to-earth, 2 kV line-to-line). When implemented with proper PCB layout (including short traces, ground plane coupling, and recommended pad dimensions), the SMBJ26CAHM3_A/H enables system-level compliance with this immunity standard. Its 42.1 V clamping voltage ensures protected ICs remain within safe operating limits during full-spectrum surge testing.
SMBJ26CAHM3_A/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:
- Obsolete
- 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_A/H FAQ
1.How can I place an order for SMBJ26CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ26CAHM3_A/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_A/H reliable?
The price and inventory of SMBJ26CAHM3_A/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_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ26CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ26CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ26CAHM3_A/H?
SMBJ26CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ26CAHM3_A/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_A/H?
For technical support, including SMBJ26CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ26CAHM3_A/H requirements.
6.How does Aetrix verify that SMBJ26CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ26CAHM3_A/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_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ26CAHM3_A/H?
All SMBJ26CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ26CAHM3_A/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_A/H part is unused and in its original packaging.
Return procedure for SMBJ26CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ26CAHM3_A/H Tags
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