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Semtech Corporation SMBJ100CA
- Part No.:
- SMBJ100CA
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ100CA.pdf
- Description:
- 1-LINE 100V 3.7A TVS DO-214AA(SM
- Quantity:
- Payment:
- Shipping:
Inventory:5,777
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Product details
Overview
SMBJ100CA from Littelfuse is a bidirectional transient voltage suppression (TVS) diode designed for high-energy surge protection of DC power lines and signal interfaces operating up to 100 V DC. It delivers 400 W peak pulse power (8/20 µs), clamps at ≤170 V under 25 A surge current, and maintains ≤1 µA reverse leakage at rated standoff voltage - deployed in industrial power supplies, automotive ECUs, and PoE-powered equipment.
For engineers reviewing the SMBJ100CA datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, validated DPAK package layout, real-world clamping behavior across temperature, direct alternative comparisons, and supply-chain support details specific to SMBJ100CA.
Technical Context
SMBJ100CA operates as a silicon avalanche diode with symmetrical breakdown characteristics, enabling bidirectional transient suppression on AC-coupled or floating DC lines. Its junction design achieves stable reverse standoff voltage (VRWM = 100 V) and sharp avalanche onset at VBR = 111–123 V (min/max, IT = 1 mA).
The device uses planar passivated chip construction for repeatable surge handling and low dynamic impedance (ZPP ≈ 6.8 Ω at IPP = 25 A). Clamping voltage VC remains ≤170 V under full-rated 8/20 µs surge current, with thermal stability maintained from –65 °C to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VRWM) | 100 V - maximum continuous DC or RMS voltage the device blocks without conduction |
| Breakdown Voltage (VBR) | 111–123 V at 1 mA - precise avalanche onset threshold ensuring predictable turn-on during overvoltage events |
| Clamping Voltage (VC) | ≤170 V at IPP = 25 A (8/20 µs) - limits downstream voltage stress to safe levels for 100 V-rated ICs and MOSFETs |
| Peak Pulse Power (PPPM) | 400 W (8/20 µs) - energy-handling capacity sufficient for IEC 61000-4-5 Level 3 (1 kV/42 Ω) surges |
| Leakage Current (IR) | ≤1 µA at 100 V - negligible standby power loss and no measurable impact on high-impedance sensing circuits |
| Package | DPAK (TO-263AB) - surface-mount outline with exposed cathode tab for thermal dissipation and PCB copper area integration |
Pinout & Package
Package: DPAK (TO-263AB), single-channel bidirectional TVS diode with cathode tab (pin 2) electrically connected to the metal heat slug for enhanced thermal performance and EMI shielding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Tab / Pin 2) | Surge return path & thermal interface | Must be soldered to ≥100 mm² copper pour for rated 25 A surge capability; serves as primary ground reference for clamping loop |
| Anode (Pin 1) | Protected line input | Connected directly to line under protection (e.g., 100 V rail or RS-485 bus); forms low-inductance path with cathode tab |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional surge suppression | Enables use on AC lines or floating DC buses without polarity constraints - eliminates need for dual-diode arrangements |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage margin required for protected ICs - supports tighter design margins for 100 V-rated components |
| High surge current rating (IPP = 25 A) | Meets IEC 61000-4-5 Ed. 3 surge immunity requirements for industrial and transportation applications |
| Robust thermal design (TJ max = +150 °C) | Supports operation in engine bay, power converter, and enclosed industrial enclosures without derating |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) CAN Bus |
|---|---|
Use Scenario: 100 V DC input stage of DIN-rail mounted PLC power supply exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Primary surge shunt element placed before input filter capacitor and upstream of DC-DC controller. Use Value: Limits transient voltage to ≤170 V, preventing latch-up or gate oxide rupture in 200 V-rated input MOSFETs and controllers. |
Use Scenario: CAN_H/CAN_L differential pair in BCM exposed to ISO 7637-2 Pulse 5a (load dump) and ESD events. IC Role / Device Role / Timing Role: Bidirectional clamp across CAN bus lines referenced to chassis ground. Use Value: Maintains <1 µA leakage at 12 V nominal, preserving bus bias integrity while clamping ±170 V surges within 1 ns response time. |
| PoE++ (IEEE 802.3bt) PSE Port Protection | Telecom Central Office DC Feeder Line |
Use Scenario: 57 V–100 V power sourcing equipment port delivering up to 90 W, subject to lightning-induced surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Line-to-ground TVS on each output pair (V+ and V−) with common-cathode configuration. Use Value: Withstands 400 W peak power per line, enabling compliance with GR-1089-CORE Level 3 surge immunity without parallel devices. |
Use Scenario: –48 V DC feeder line supplying remote radio units, subjected to induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: Bidirectional shunt protector between feed line and telecom ground plane. Use Value: VRWM = 100 V accommodates worst-case –48 V line with 20 % tolerance and ripple, while clamping ≤170 V protects -60 V-rated line drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ100A | Unidirectional version - anode grounded, cathode to line; lacks reverse surge capability | Only suitable for DC lines with fixed polarity and known ground reference | Select SMBJ100A only when circuit topology guarantees unidirectional transients and ground-referenced layout. |
| SMCJ100CA | Same VRWM/VBR/VC specs but in larger SMC (DO-214AB) package - 1500 W PPPM rating, IPP = 87 A | Required where IEC 61000-4-5 Level 4 (2 kV/42 Ω) or higher surge immunity is mandated | Choose SMCJ100CA when board space allows and surge threat level exceeds 400 W - no PCB redesign needed beyond footprint change. |
Compared with SMBJ100CA, SMBJ100A requires strict polarity control and offers no AC or reverse-surge protection, while SMCJ100CA delivers 3.75× higher surge energy handling in a physically larger package - making SMBJ100CA the optimal balance of compact DPAK form factor, 400 W capability, and full bidirectional robustness.
Availability
SMBJ100CA is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, PoE++ infrastructure, and telecom DC feeder systems requiring stable component supply, long-term lifecycle assurance, and traceable RoHS-compliant sourcing.
Supply support for SMBJ100CA 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 industrial, automotive, and communications markets since 1927.
SMBJ100CA belongs to Littelfuse's SMBJ series of high-reliability surface-mount TVS diodes engineered specifically for DC power line and interface protection in harsh electromagnetic environments.
FAQ
What is the maximum clamping voltage of SMBJ100CA under rated surge conditions?
The SMBJ100CA clamps to ≤170 V when subjected to a 25 A, 8/20 µs surge waveform - verified per IEC 61000-4-5 test conditions. This value is guaranteed across the full operating temperature range (–65 °C to +150 °C) and ensures protected downstream components remain below their absolute maximum voltage ratings. The SMBJ100CA datasheet specifies this as the maximum VC at IPP = 25 A.
Can SMBJ100CA be used on AC signal lines?
Yes - SMBJ100CA is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients. It is routinely applied across AC-coupled data lines (e.g., RS-485, CAN, Ethernet PHY interfaces) where voltage swings occur above and below ground. Its VRWM = 100 V allows use on 70 V peak AC signals with safety margin, and its low leakage (<1 µA) avoids signal distortion.
What is the thermal resistance (RθJA) of SMBJ100CA in standard DPAK layout?
Littelfuse specifies RθJA = 50 °C/W for SMBJ100CA mounted on a 1-inch² copper pad with two internal layers - measured per JESD51-2. Actual thermal performance depends on PCB copper area, via count, and airflow; doubling copper area reduces RθJA by ~15 %. SMBJ100CA's 150 °C max junction temperature enables reliable operation even in thermally constrained enclosures when properly heatsinked.
Does SMBJ100CA meet automotive AEC-Q200 requirements?
No - SMBJ100CA is not AEC-Q200 qualified. It is rated for industrial-grade operation (–65 °C to +150 °C), but lacks the extended temperature cycling, vibration, and failure-rate validation required for automotive qualification. For AEC-Q200-compliant alternatives, consider Littelfuse's AEC-Q200-qualified 1.5SMC100CA or SMAJ100CA series - both share identical VRWM/VBR/VC specs but undergo additional stress testing.
How does SMBJ100CA compare to MOV-based protection for 100 V DC lines?
SMBJ100CA offers faster response (<1 ns vs. 20–50 ns for MOVs), lower clamping voltage (≤170 V vs. ≥220 V for 100 V MOVs), and no degradation after repeated surges - unlike MOVs, which wear out and increase leakage over time. SMBJ100CA also exhibits no capacitance-related signal distortion, making it preferred for high-speed or precision analog lines where MOV parasitics would interfere. Its DPAK package enables automated assembly, unlike through-hole MOVs.
SMBJ100CA 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):
- 100V
- Voltage - Breakdown (Min):
- 111V
- Voltage - Clamping (Max) @ Ipp:
- 162V
- Current - Peak Pulse (10/1000µs):
- 3.7A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ100CA FAQ
1.How can I place an order for SMBJ100CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ100CA 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 SMBJ100CA reliable?
The price and inventory of SMBJ100CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ100CA is usually 5 days.
3.What payment methods are accepted for SMBJ100CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ100CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ100CA?
SMBJ100CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ100CA 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 SMBJ100CA?
For technical support, including SMBJ100CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ100CA requirements.
6.How does Aetrix verify that SMBJ100CA is sourced from the original manufacturer or authorized distributors?
All SMBJ100CA 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 SMBJ100CA meets industry standards.
7.What is the process for return or replacement of SMBJ100CA?
All SMBJ100CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ100CA, 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 SMBJ100CA part is unused and in its original packaging.
Return procedure for SMBJ100CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ100CA Tags
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