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Vishay General Semiconductor - Diodes Division SMBJ14CAHE3/5B
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- Part No.:
- SMBJ14CAHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ14CAHE3/5B.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,777
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Product details
Overview
SMBJ14CAHE3/5B 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 14 V standoff voltage (VWM), 23.2 V maximum clamping voltage (VC) at 25.9 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), commonly deployed to protect MOSFET gates, sensor interfaces, and industrial I/O lines against ESD and inductive switching surges.
For engineers reviewing the SMBJ14CAHE3/5B datasheet, SMBJ14CAHE3/5B pinout, SMBJ14CAHE3/5B application, or SMBJ14CAHE3/5B equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), junction temperature range (–55 to +150 °C), and compliance with UL 497B surge protector classification.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 µA leakage at 14 V), but switches to low-impedance conduction within picoseconds when transient voltage exceeds its breakdown threshold (VBR = 15.6–17.2 V at 1 mA). Its bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity constraints.
The SMBJ14CAHE3/5B uses a glass-passivated silicon junction, achieves 0.087 %/°C temperature coefficient of VBR, and meets J-STD-020 MSL Level 1 moisture sensitivity with 260 °C reflow peak. It is rated for repetitive 600 W pulses at 0.01 % duty cycle and withstands 100 A non-repetitive forward surge (8.3 ms half-sine) in unidirectional mode - though this rating does not apply to the bidirectional SMBJ14CA variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before significant leakage; defines upper limit of protected circuit's normal operating range. |
| VBR (min/max) | 15.6 V / 17.2 V at 1 mA - Breakdown onset range; ensures reliable turn-on above system operating voltage while avoiding false triggering. |
| VC @ IPPM | 23.2 V at 25.9 A - Clamped voltage during 10/1000 µs transient; determines maximum stress imposed on downstream ICs during surge events. |
| PPPM | 600 W - Peak pulse power handling capacity; supports robust protection against lightning-induced surges and inductive kickback in industrial environments. |
| IPPM | 25.9 A - Peak surge current capability under standardized 10/1000 µs waveform; directly correlates with energy absorption (E ≈ 1.2 × VC × IPPM × t). |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial enclosures without derating. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs PCB thermal design for sustained surge repetition. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H), matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified (HE3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Accepts surge current from either direction; connects to line being protected (e.g., RS-485 A/B, CAN_H/L, or DC bus). |
| Cathode | Transient current exit (bidirectional) | Completes shunt path to ground or reference rail; requires low-inductance connection to minimize clamping overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables symmetric protection of AC signals, differential buses (e.g., CAN, RS-485), or floating power rails without external polarity management. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - suitable for under-dash and powertrain ECUs. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV surge) and ISO 7637-2 Pulse 1/2b/5a waveforms when properly laid out on PCB. |
| Low clamping ratio (VC/VBR ≈ 1.43) | Minimizes overvoltage stress on protected ICs - critical for 3.3 V or 5 V logic interfaces where margin above VDD is narrow. |
| MSL Level 1, 260 °C reflow | Supports standard lead-free SMT assembly without pre-baking; eliminates moisture-related popcorning risk during manufacturing. |
Applications
| Automotive Sensor Interface Protection | Industrial RS-485 Bus Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional shunt TVS placed between sensor signal line and chassis ground, clamping transients before they reach ADC input or op-amp buffer. Use Value: Prevents sensor signal corruption and microcontroller reset during 12 V/24 V system voltage spikes up to ±300 V, leveraging 23.2 V clamping to keep stress below 5 V rail tolerance. |
Use Scenario: Safeguarding RS-485 transceivers in factory automation PLCs connected to long cable runs subject to EFT and lightning-induced surges. IC Role / Device Role / Timing Role: Paired TVS devices (one per line) mounted at connector entry point, referenced to common-mode ground to suppress differential and common-mode transients. Use Value: Maintains data integrity across 1 Mbps RS-485 links by limiting line-to-line voltage excursion to ≤46.4 V (2 × VC), well below transceiver absolute maximum ratings. |
| Consumer USB Port ESD Protection | DC Power Input Surge Suppression |
Use Scenario: Adding secondary-level ESD immunity to USB 2.0 D+/D– lines in smart home hubs after primary polymer-based TVS. IC Role / Device Role / Timing Role: Fast-response silicon TVS placed adjacent to USB connector, providing sub-nanosecond clamping for ±15 kV contact discharge (IEC 61000-4-2). Use Value: Reduces failure rate of USB PHY ICs by limiting transient voltage to 23.2 V, preventing gate oxide rupture in 3.3 V interface circuits. |
Use Scenario: Protecting 12 V DC input stage of PoE-powered access points against induced surges from nearby AC mains switching. IC Role / Device Role / Timing Role: Shunt-connected TVS between VIN and GND, sized to absorb 600 W pulses without thermal runaway during repeated inductive switch-offs. Use Value: Extends power supply MTBF by diverting >95 % of 10/1000 µs surge energy away from input capacitors and DC-DC controller ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ14CA-M3/5B | Halogen-free, RoHS-compliant, same electrical specs and AEC-Q101 qualification; differs only in material composition (HM3 vs HE3). | No functional difference; selected when halogen-free compliance is mandated by OEM environmental policy. | Direct drop-in replacement if halogen-free requirement applies; identical footprint, thermal, and electrical behavior. |
| SMCJ14CAHE3/5B | Same VWM/VC specs but in larger SMC (DO-214AB) package; 1500 W PPPM, lower RθJA (50 °C/W), higher IPPM (51.8 A). | Used where higher surge energy absorption or improved thermal performance is required, e.g., main power rail protection. | Choose when system-level surge testing exceeds 600 W; requires PCB layout change due to larger 7.11 mm × 6.22 mm footprint. |
Compared with SMBJ14CAHE3/5B, the SMBJ14CA-M3/5B offers identical protection performance with halogen-free construction, while the SMCJ14CAHE3/5B delivers double the surge power rating at the cost of increased board area and thermal design complexity.
Availability
SMBJ14CAHE3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial RS-485 networks, and consumer USB port protection requiring stable component supply across multi-year production cycles.
Supply support for SMBJ14CAHE3/5B 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, efficiency, and application-specific optimization.
The SMBJ series is part of Vishay's TRANSZORB® TVS portfolio, engineered for fast-response, high-energy transient suppression in automotive, industrial, and communications systems where robustness and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMBJ14CAHE3/5B at its rated peak pulse current?
The SMBJ14CAHE3/5B has a maximum clamping voltage (VC) of 23.2 V when subjected to its rated peak pulse current (IPPM) of 25.9 A under the standard 10/1000 µs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ14CAHE3/5B maintains this clamping performance across its full operating temperature range (–55 to +150 °C) with minimal drift.
Is SMBJ14CAHE3/5B suitable for automotive applications?
Yes, SMBJ14CAHE3/5B is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood and body-control module environments. Its construction includes glass-passivated junctions, MSL Level 1 reflow compatibility, and validated performance across –55 to +150 °C junction temperature. The HE3 suffix confirms RoHS compliance and automotive qualification - making SMBJ14CAHE3/5B appropriate for CAN bus protection, sensor signal conditioning, and infotainment power rail safeguarding.
How does the bidirectional configuration of SMBJ14CAHE3/5B affect its circuit placement?
The bidirectional configuration of SMBJ14CAHE3/5B eliminates polarity dependency, allowing it to be placed across any two nodes requiring symmetrical overvoltage protection - such as differential signal pairs (RS-485, CAN) or AC-coupled lines. Unlike unidirectional TVS diodes, SMBJ14CAHE3/5B has no cathode band marking and must be connected without regard to orientation. This simplifies layout and reduces BOM count in balanced interface designs.
What is the maximum leakage current of SMBJ14CAHE3/5B at its standoff voltage?
At its 14 V standoff voltage (VWM), the SMBJ14CAHE3/5B exhibits a maximum reverse leakage current (ID) of 1.0 µA at 25 °C, per Vishay's datasheet specifications. This ultra-low leakage ensures negligible power loss and signal loading in battery-powered or high-impedance sensor circuits. Leakage remains below 5 µA even at +85 °C ambient, preserving accuracy in precision analog front-ends.
Can SMBJ14CAHE3/5B be used in parallel for higher surge current handling?
No - SMBJ14CAHE3/5B is not recommended for parallel connection due to parameter mismatch (e.g., VBR tolerance of ±5 %) that causes uneven current sharing and potential thermal runaway. For higher surge capability, select a single device with greater PPPM rating (e.g., SMCJ14CAHE3/5B) or implement staged protection with upstream current-limiting resistors. Parallel use of SMBJ14CAHE3/5B violates Vishay's application guidance and voids AEC-Q101 qualification guarantees.
SMBJ14CAHE3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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):
- 25.9A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ14CAHE3/5B FAQ
1.How can I place an order for SMBJ14CAHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ14CAHE3/5B 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 SMBJ14CAHE3/5B reliable?
The price and inventory of SMBJ14CAHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ14CAHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ14CAHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ14CAHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ14CAHE3/5B?
SMBJ14CAHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ14CAHE3/5B 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 SMBJ14CAHE3/5B?
For technical support, including SMBJ14CAHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ14CAHE3/5B requirements.
6.How does Aetrix verify that SMBJ14CAHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ14CAHE3/5B 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 SMBJ14CAHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ14CAHE3/5B?
All SMBJ14CAHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ14CAHE3/5B, 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 SMBJ14CAHE3/5B part is unused and in its original packaging.
Return procedure for SMBJ14CAHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ14CAHE3/5B Tags
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