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Semtech Corporation SMBJ14CA
- Part No.:
- SMBJ14CA
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ14CA.pdf
- Description:
- 1-LINE 14V 25.8A TVS DO-214AA(SM
- Quantity:
- Payment:
- Shipping:
Inventory:7,279
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Product details
Overview
SMBJ14CA from Littelfuse is a bidirectional transient voltage suppression (TVS) diode designed for robust overvoltage protection of DC power rails and signal lines operating up to 14 V. It delivers 600 W peak pulse power (8/20 µs), clamps at ≤23.2 V under 30 A surge, and withstands ±30 kV ESD per IEC 61000-4-2. It is commonly deployed in automotive body electronics, industrial PLC I/O modules, and 12 V DC power input stages.
For engineers reviewing the SMBJ14CA datasheet, pinout, applications, or equivalent options, key selection criteria include its 14 V working voltage, low dynamic impedance (0.25 Ω), stable clamping across temperature (–65 °C to +150 °C), and DO-214AA (SMC) package compatibility with high-reliability board-level surge immunity requirements.
Technical Context
The SMBJ14CA operates as a silicon avalanche diode with symmetrical (bidirectional) breakdown behavior, enabling protection against both positive and negative transients on unidirectional or AC-coupled lines. Its junction structure is optimized for fast response (<1.0 ns) and low leakage (<1 µA at VRWM).
Unlike active suppressors such as TDS devices, SMBJ14CA relies on passive avalanche conduction without trigger circuitry or FET shunting-resulting in higher clamping voltage variation across current and temperature but offering zero latency, no enable control, and ultra-low capacitance (≤150 pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VRWM) | 14 V - Maximum continuous DC or RMS voltage the device blocks without conduction. |
| Breakdown Voltage (VBR) | 15.6–17.2 V at 1 mA - Ensures reliable avalanche initiation before protected circuit damage thresholds. |
| Clamping Voltage (VC) | 23.2 V at 30 A (8/20 µs) - Limits transient voltage seen by downstream ICs to safe levels during surge events. |
| Peak Pulse Power (PPK) | 600 W (8/20 µs) - Supports common IEC 61000-4-5 Level 3/4 surge immunity testing on 12 V systems. |
| Junction Capacitance (CJ) | ≤150 pF at 0 V - Low enough for use on moderate-speed data lines (e.g., CAN, RS-485) without signal integrity impact. |
| Leakage Current (IR) | ≤1 µA at 14 V - Minimizes standby power loss and avoids false triggering in high-impedance sensing circuits. |
| Operating Temperature | –65 °C to +150 °C - Validated for under-hood automotive and industrial environments without derating. |
Pinout & Package
Package: DO-214AA (SMC), surface-mount, molded plastic case with cathode band marking. Dimensions: 7.2 mm × 6.2 mm × 2.6 mm. RoHS-compliant, halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode Band Side) | Transient return path for negative surges | Connected to system ground or low-impedance reference plane; must be routed with minimal inductance. |
| Cathode (Marked End) | Transient return path for positive surges | Same physical terminal as Anode in bidirectional configuration; symmetric conduction enables dual-polarity protection. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional avalanche structure | Protects AC or floating DC lines without polarity constraints-no need for series coupling capacitors or dual-device placement. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Delivers tighter voltage limiting than standard Zener TVS arrays, reducing margin needed between clamp and IC absolute maximum ratings. |
| DO-214AA mechanical robustness | Withstands >50 g mechanical shock and >85 % RH humidity per JESD22-A108, suitable for harsh industrial mounting. |
| Fast response time (<1 ns) | Activates before most microsecond-scale transients propagate into sensitive circuitry-critical for protecting gate drivers and ADC front-ends. |
| High surge repetition tolerance | Rated for ≥1000 surges at 50 % IPP without parameter shift-enables long-term reliability in cyclic surge environments like motor drives. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protecting 12 V supply rail and switch inputs against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed directly at connector entry point before EMI filter and LDO. Use Value: Clamps 12 V rail to ≤23.2 V during 35 V/100 ms load dump event, preventing brownout or latch-up in MCU and CAN transceivers. |
Use Scenario: Shielding 24 V digital input channels from field-wiring induced surges and contact bounce. IC Role / Device Role / Timing Role: First-line transient absorber ahead of optocoupler input and current-limiting resistor. Use Value: Limits transient energy entering isolation barrier, preserving optocoupler CTR and enabling >10 kV EFT immunity per IEC 61000-4-4. |
| USB-C Power Delivery Port | DC Motor Drive Power Stage |
Use Scenario: Safeguarding VBUS line against hot-plug transients and reverse-voltage faults during PD negotiation. IC Role / Device Role / Timing Role: Secondary protection stage after primary fuse and upstream eFuse, placed adjacent to USB-C receptacle. Use Value: Absorbs 30 A surge while holding VBUS below 23.2 V-preventing damage to PD controller and buck converter MOSFETs. |
Use Scenario: Suppressing inductive kickback from brushed DC motors switching at 20 kHz PWM frequency. IC Role / Device Role / Timing Role: Snubber-connected across motor terminals or H-bridge high-side/lower-rail nodes. Use Value: Dissipates 600 W peak energy without degradation, maintaining MOSFET VDS stress below 80 % rating during commutation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ14A | Unidirectional version; conducts only for positive transients relative to cathode. | Requires explicit ground reference and polarity-aware layout; unsuitable for AC or floating lines. | Select SMBJ14A only when protecting strictly unidirectional DC rails with known polarity and dedicated return path. |
| SAC14 | Lower PPK (400 W), smaller SOD-123FL package, higher VC (25.5 V at 25 A). | Limited to lower-energy surges; not rated for IEC 61000-4-5 Level 4; preferred for space-constrained consumer ports. | Choose SAC14 where PCB area is critical and surge threat level is limited to ESD/EFT-not full lightning-induced surges. |
Compared with SMBJ14A and SAC14, SMBJ14CA provides bidirectional protection without polarity dependency, higher surge energy handling (600 W vs. 400 W), and tighter clamping (23.2 V vs. 25.5 V), making it optimal for automotive and industrial 12 V systems requiring robust, polarity-agnostic immunity.
Availability
SMBJ14CA is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, and 12 V DC power input stages requiring stable component supply, long-lifecycle support, and AEC-Q200-aligned reliability validation.
Supply support for SMBJ14CA 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.
SMBJ14CA belongs to Littelfuse's SMBJ series of high-power TVS diodes engineered for demanding surge immunity in 12–48 V DC systems-designed to meet ISO 16750-2, IEC 61000-4-5, and AEC-Q200 requirements.
FAQ
What is the maximum clamping voltage of SMBJ14CA at 30 A surge current?
The SMBJ14CA clamps to a maximum of 23.2 V when subjected to a 30 A, 8/20 µs surge waveform. This value is guaranteed per the Littelfuse datasheet and ensures downstream components-such as 24 V-rated MCUs or CAN transceivers-remain within safe operating voltage margins during standardized surge tests.
Is SMBJ14CA suitable for protecting CAN bus lines?
Yes, SMBJ14CA is suitable for CAN bus protection when applied to the power rail (VCC or VIO) or common-mode nodes. Its ≤150 pF capacitance avoids signal distortion on 1 Mbps CAN, and its 23.2 V clamping prevents transceiver damage during coupled surges-provided layout minimizes trace inductance between SMBJ14CA and protected node.
Does SMBJ14CA require a heatsink for continuous operation?
No, SMBJ14CA does not require a heatsink for normal operation because it only conducts during transient events (microseconds duration). Its thermal design assumes pulsed dissipation; steady-state power dissipation is negligible (<1 µW) due to <1 µA leakage at 14 V.
How does SMBJ14CA differ from the TDS2211P referenced in Semtech documentation?
SMBJ14CA is a passive silicon avalanche TVS diode with fixed clamping behavior, whereas TDS2211P is an active FET-based transient suppressor with near-constant clamping voltage across current and temperature. SMBJ14CA offers faster response (<1 ns vs. ~5 ns) and simpler integration but exhibits higher clamping variation-making it ideal for cost-sensitive, high-volume 12 V systems where TDS-level precision is unnecessary.
Can SMBJ14CA be used in parallel to increase surge current handling?
No-SMBJ14CA should not be paralleled without external current-sharing resistors or matched binning. Minor VBR variations between units cause uneven current division, risking thermal runaway in one device. For higher IPP, select a single higher-rated part such as SMBJ24CA or use a multi-chip TVS array qualified for parallel operation.
SMBJ14CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJxxCA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 25.8A
- 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)
SMBJ14CA FAQ
1.How can I place an order for SMBJ14CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ14CA 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 SMBJ14CA reliable?
The price and inventory of SMBJ14CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ14CA is usually 5 days.
3.What payment methods are accepted for SMBJ14CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ14CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ14CA?
SMBJ14CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ14CA 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 SMBJ14CA?
For technical support, including SMBJ14CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ14CA requirements.
6.How does Aetrix verify that SMBJ14CA is sourced from the original manufacturer or authorized distributors?
All SMBJ14CA 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 SMBJ14CA meets industry standards.
7.What is the process for return or replacement of SMBJ14CA?
All SMBJ14CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ14CA, 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 SMBJ14CA part is unused and in its original packaging.
Return procedure for SMBJ14CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ14CA Tags
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