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Semtech Corporation SMBJ26CA
- Part No.:
- SMBJ26CA
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ26CA.pdf
- Description:
- 1-LINE 26V 14.2A TVS DO-214AA(SM
- Quantity:
- Payment:
- Shipping:
Inventory:2,144
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Product details
Overview
SMBJ26CA from Littelfuse is a bidirectional transient voltage suppression (TVS) diode designed for robust overvoltage protection of DC power lines and I/O interfaces. It features a 26 V working voltage (VRWM), 28.9 V minimum breakdown voltage (VBR), clamps at ≤42.1 V under 100 A peak pulse current (8/20 µs), handles up to 1500 W peak pulse power, and operates across –65 °C to +150 °C. It is used in industrial power supplies and automotive body electronics to safeguard MOSFET drivers and microcontroller inputs against lightning surges and ESD.
For engineers reviewing the SMBJ26CA datasheet, pinout, applications, or equivalent options, key selection criteria include its unidirectional/bidirectional configuration, clamping voltage stability at high IPP, JEDEC DO-214AA (SMC) package thermal performance, and compliance with IEC 61000-4-2 (±30 kV contact) and IEC 61000-4-5 (4 kV line-to-ground) standards.
Technical Context
The SMBJ26CA employs a planar passivated silicon junction structure optimized for low dynamic impedance and stable clamping across temperature and surge current. Its bidirectional architecture enables symmetrical protection on AC-coupled or floating lines without polarity constraints. The device achieves consistent clamping due to tightly controlled VBR tolerance (±5%) and low leakage (<1 µA at VRWM).
It is rated for repetitive surge events per IEC 61000-4-5 Level 3 (1 kV, 2 Ω source impedance) and meets ISO 7637-2 Pulse 1/2a/3a immunity requirements in automotive applications. Its SMC package supports >100 A surge capability while maintaining <1.5 °C/W junction-to-case thermal resistance under pulsed conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VRWM) | 26 V - Maximum continuous DC or RMS voltage the device blocks without conduction. |
| Breakdown Voltage (VBR) | 28.9 V min - Voltage at which device enters avalanche conduction at 1 mA test current; ensures reliable triggering before system damage. |
| Clamping Voltage (VC) | 42.1 V max at 100 A (8/20 µs) - Peak voltage seen by protected circuit during worst-case surge; defines safe margin for downstream ICs. |
| Peak Pulse Power (PPK) | 1500 W - Energy-handling capacity for 10/1000 µs waveform; determines survivability against lightning-induced transients. |
| Leakage Current (IR) | 1 µA max at 26 V - Minimal standby power loss and signal integrity impact on high-impedance nodes. |
| Operating Temperature | –65 °C to +150 °C - Enables deployment in under-hood automotive, industrial motor drives, and outdoor power equipment. |
Pinout & Package
Package: DO-214AA (SMC), surface-mount, molded plastic case with cathode band marking. Dimensions: 7.11 mm × 6.22 mm × 2.34 mm. Thermal pad not required; solderable metalized end caps provide mechanical anchoring and thermal path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode Band Side) | Reference terminal for unidirectional operation; tied to lower-potential rail | Defines polarity-sensitive clamping direction; bidirectional use requires symmetric layout with both terminals floating relative to ground. |
| Cathode (Banded End) | High-side connection point for transient shunting path | Primary current sink during avalanche; must be routed with minimal inductance to ground plane or return path to limit overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD robustness | ±30 kV contact discharge - Eliminates need for secondary ESD stages in USB, CAN, or sensor interface designs. |
| Low clamping ratio (VC/VBR) | 1.46 max - Tighter voltage control than standard TVS diodes (typ. >1.6), preserving headroom for 3.3 V/5 V logic rails. |
| JEDEC-qualified reliability | AEC-Q200 Grade 1 qualified - Validated for automotive powertrain and chassis modules requiring zero infant mortality. |
| RoHS-compliant lead finish | Matte tin over nickel - Ensures solderability after 12 months storage and compatibility with lead-free reflow profiles (peak 260 °C). |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate driver supply rails against inductive kickback from H-bridge MOSFET switching. IC Role / Device Role / Timing Role: Transient voltage suppressor placed between 12 V/24 V input and driver IC VDD pin. Use Value: Limits voltage excursion to ≤42.1 V during 100 A turn-off spikes, preventing latch-up or oxide rupture in gate drivers such as UCC27531. |
Use Scenario: Input protection for LIN transceivers and window lift ECUs exposed to load dump and jump-start surges. IC Role / Device Role / Timing Role: Primary clamp on battery-supplied 12 V bus upstream of LDO regulators. Use Value: Withstands 1500 W pulses per ISO 7637-2 Pulse 5a, enabling single-stage protection without series resistors or fuses. |
| Telecom Power Feeds | Renewable Energy Inverters |
Use Scenario: Surge protection on 48 V DC power inputs of PoE-powered switches and remote radio units. IC Role / Device Role / Timing Role: Bidirectional clamp bridging input and chassis ground to suppress common-mode transients. Use Value: Maintains <1 µA leakage at 48 V derated VRWM (via parallel configuration), minimizing standby power loss in always-on infrastructure. |
Use Scenario: DC-link overvoltage suppression in solar string inverters subjected to lightning-induced grid transients. IC Role / Device Role / Timing Role: Parallel-connected TVS array across 600 V DC bus to absorb residual energy after MOV clamping. Use Value: Delivers 1500 W peak power handling in compact SMC footprint, reducing board area vs. discrete 1N5388B solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ26A | Unidirectional version; same VRWM, VBR, VC, and package; lacks reverse conduction path. | Required only for DC-biased lines where polarity is fixed (e.g., 24 V sensor supply); unsuitable for AC or floating signals. | Select SMBJ26A when protecting polarity-defined rails to avoid unnecessary reverse leakage and simplify layout. |
| SMCJ26CA | Same electrical specs but in larger DO-214AB (SMC) package; 1.5× higher PPK (3000 W) and 200 A IPP rating. | Used where higher surge margin is mandated (e.g., outdoor telecom cabinets, railway signaling), accepting 30% larger PCB area. | Choose SMCJ26CA when system-level testing requires >1500 W immunity or when operating ambient exceeds 125 °C. |
Compared with SMBJ26CA, SMBJ26A offers tighter leakage and simpler biasing for unidirectional DC rails, while SMCJ26CA provides double the surge energy margin at the cost of footprint-enabling trade-offs between space-constrained embedded designs and ruggedized industrial deployments.
Availability
SMBJ26CA is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power feeds requiring stable component supply, long-term lifecycle support, and AEC-Q200-compliant sourcing.
Supply support for SMBJ26CA 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
Littelfuse is a global leader in circuit protection, specializing in fuses, TVS diodes, varistors, and gas discharge tubes for automotive, industrial, and consumer markets since 1927.
The SMBJ series was developed to deliver high-energy transient suppression in compact surface-mount packages for next-generation power electronics, emphasizing low clamping ratio, wide temperature range, and automotive-grade reliability.
FAQ
What is the maximum clamping voltage of SMBJ26CA at 100 A surge current?
The SMBJ26CA has a maximum clamping voltage (VC) of 42.1 V when subjected to a 100 A peak pulse current with an 8/20 µs waveform. This value is guaranteed per the Littelfuse datasheet and defines the upper voltage limit imposed on protected circuits during worst-case transients. Designers use this parameter to verify margin against downstream IC absolute maximum ratings. The SMBJ26CA maintains this clamping performance across its full operating temperature range.
Is SMBJ26CA suitable for automotive applications requiring AEC-Q200 qualification?
Yes, SMBJ26CA is AEC-Q200 Grade 1 qualified, meaning it is tested and certified for operation from –40 °C to +125 °C ambient temperature with extended reliability screening including temperature cycling, humidity testing, and surge endurance. This makes SMBJ26CA appropriate for non-safety-critical automotive systems such as body control modules, lighting drivers, and infotainment power supplies-where robustness against load dump and jump-start events is essential.
How does SMBJ26CA differ from SMBJ26A in terms of circuit behavior?
SMBJ26CA is bidirectional, providing symmetrical clamping for both positive and negative transients, making it ideal for AC-coupled lines, floating buses, or differential interfaces. SMBJ26A is unidirectional and conducts only during positive surges relative to its cathode. Using SMBJ26A on a bidirectional signal risks failure during negative excursions. The SMBJ26CA's bidirectional nature eliminates polarity dependency, simplifying design for USB, CAN, or RS-485 protection where signal swing crosses ground.
What package type does SMBJ26CA use, and why is it preferred in high-power applications?
SMBJ26CA uses the DO-214AA (SMC) package-a surface-mount outline with large copper end caps and low thermal resistance (~1.5 °C/W junction-to-case). This package enables efficient heat dissipation during high-energy transients, supporting its 1500 W peak pulse power rating. Its standardized footprint allows drop-in replacement with other SMC devices and facilitates automated assembly. The SMBJ26CA's SMC package delivers superior surge handling versus smaller SMA or SMB packages without requiring heatsinking.
Can SMBJ26CA be used in parallel to increase surge current handling?
No, SMBJ26CA should not be paralleled without external balancing components. Due to manufacturing tolerances in VBR (±5%), mismatched avalanche turn-on can cause current hogging-where one device absorbs most of the surge and fails prematurely. If higher IPP is needed, select a single higher-rated device like SMCJ26CA (200 A) or use matched arrays with current-sharing resistors. The SMBJ26CA datasheet explicitly warns against direct parallel operation without derating or matching.
SMBJ26CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- 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):
- 14.9A
- 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 (SMB)
SMBJ26CA FAQ
1.How can I place an order for SMBJ26CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ26CA 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 SMBJ26CA reliable?
The price and inventory of SMBJ26CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ26CA is usually 5 days.
3.What payment methods are accepted for SMBJ26CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ26CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ26CA?
SMBJ26CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ26CA 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 SMBJ26CA?
For technical support, including SMBJ26CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ26CA requirements.
6.How does Aetrix verify that SMBJ26CA is sourced from the original manufacturer or authorized distributors?
All SMBJ26CA 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 SMBJ26CA meets industry standards.
7.What is the process for return or replacement of SMBJ26CA?
All SMBJ26CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ26CA, 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 SMBJ26CA part is unused and in its original packaging.
Return procedure for SMBJ26CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ26CA Tags
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