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Vishay General Semiconductor - Diodes Division SMB8J14CAHE3/5B
- Part No.:
- SMB8J14CAHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J14CAHE3/5B.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,797
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Product details
Overview
SMB8J14CAHE3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on signal and power lines. It features a 14 V standoff voltage (VWM), 15.6–17.2 V breakdown voltage (VBR), 23.2 V clamping voltage (VC) at 34.5 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J14CAHE3/5B datasheet, SMB8J14CAHE3/5B pinout, SMB8J14CAHE3/5B application, or SMB8J14CAHE3/5B equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VWM ≈ 1.66), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within <1 ps to transients induced by inductive switching or ESD events. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance, while the bidirectional configuration enables symmetric clamping on AC-coupled or differential signal paths without polarity constraints.
Designed per ANSI/IEEE C62.35 standards, SMB8J14CAHE3/5B delivers repeatable clamping performance up to TJ = 150 °C and supports surge currents up to 34.5 A (10/1000 µs) with thermal resistance RθJL = 20 °C/W - enabling robust operation under sustained surge stress when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 15.6 V / 17.2 V at 1.0 mA - guaranteed breakdown threshold range for reliable turn-on margin |
| VC @ IPPM | 23.2 V at 34.5 A - clamping voltage limiting downstream circuit stress during 10/1000 µs surge |
| PPPM | 800 W - peak transient power dissipation capability with standard 10/1000 µs waveform |
| IR @ VWM | 1.0 µA - ultra-low leakage ensuring minimal impact on high-impedance signal lines |
| TJ max | +150 °C - extended junction temperature rating supporting under-hood automotive use |
| MSL Level | Level 1 (J-STD-020) - no floor life limitation; compatible with standard reflow profiles up to 260 °C peak |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional device with no polarity marking - symmetrical terminal configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode) | Transient current return path | Both terminals are electrically identical; bidirectional conduction allows either terminal to serve as input or return during positive/negative surges |
| Anode (Cathode) | Transient current return path | Identical to opposite terminal; no color band or marking required for bidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS sensor interfaces |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift |
| Low clamping ratio (VC/VWM) | 1.66 - minimizes voltage overshoot across protected ICs relative to operating rail |
| Matte tin-plated leads | Complies with J-STD-002 and JESD 22-B102 for reliable solderability and whisker resistance |
| UL 94 V-0 molding compound | Self-extinguishing encapsulation meeting flame-retardancy requirements for enclosed electronics |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting LIN/CAN transceivers and MEMS pressure sensors from load-dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt clamping element placed directly at connector entry point to divert >30 A surge energy away from PHY layer ICs. Use Value: Enables compliance with ISO 16750-2 (12 V systems) and AEC-Q100 stress testing due to 150 °C TJ rating and 800 W PPPM. | Use Scenario: Safeguarding differential CAN H/L lines against ESD (IEC 61000-4-2 ±15 kV) and fast transient bursts (IEC 61000-4-4) in factory automation gateways. IC Role / Device Role / Timing Role: Bidirectional voltage clamp across twisted-pair data lines, preserving signal integrity during sub-nanosecond transients. Use Value: Maintains <1.0 µA leakage at 14 V to avoid bias disruption on high-impedance CAN termination networks. |
| Consumer Power Adapter Input | Telecom DSL Line Interface |
Use Scenario: Secondary-side surge suppression on 12–19 V DC outputs of wall adapters exposed to lightning-induced surges via connected devices. IC Role / Device Role / Timing Role: Final-stage clamping device after primary MOV and fuse, absorbing residual energy before LDO regulators. Use Value: Delivers 23.2 V clamping at 34.5 A without thermal runaway, enabling compact PCB layout with 5.0 mm × 5.0 mm thermal pads. | Use Scenario: Protecting ADSL/VDSL line drivers and SLIC circuits from induced surges on outdoor telephone lines. IC Role / Device Role / Timing Role: Bidirectional transient suppressor placed between transformer secondary and codec IC, referenced to isolated ground. Use Value: Achieves 800 W peak power handling with 72 °C/W RθJA - sufficient for intermittent surge duty in telecom central office environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J14CA-M3/5B | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification | No functional difference; selected where halogen-free material compliance is mandated | Choose SMB8J14CA-M3/5B when environmental compliance requires absence of brominated flame retardants |
| SMC8J14CAHE3/5B | Larger SMC (DO-214AB) package; same VWM/VBR/VC but higher PPPM (1500 W) and IPPM (53.5 A) | Requires larger PCB footprint; suited for higher-energy surge environments (e.g., 24 V industrial buses) | Choose SMC8J14CAHE3/5B only if system-level surge testing exceeds 800 W capability of SMB8J14CAHE3/5B |
Compared with SMB8J14CA-M3/5B, SMB8J14CAHE3/5B offers identical protection performance with standard RoHS compliance; versus SMC8J14CAHE3/5B, it trades 40% lower surge capacity for 35% smaller board area - making SMB8J14CAHE3/5B optimal for space-constrained automotive and portable designs.
Availability
SMB8J14CAHE3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus nodes, and consumer power adapter outputs requiring stable component supply with AEC-Q101 assurance and long-term production continuity.
Supply support for SMB8J14CAHE3/5B 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade validation.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-power-density, AEC-Q101-compliant transient suppression in harsh automotive and industrial environments.
FAQ
What is the clamping voltage of SMB8J14CAHE3/5B at its rated peak pulse current?
The SMB8J14CAHE3/5B has a maximum clamping voltage (VC) of 23.2 V when subjected to its rated peak pulse current (IPPM) of 34.5 A using the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for downstream ICs such as CAN transceivers or microcontrollers. The SMB8J14CAHE3/5B maintains this clamping performance across its full operating temperature range (−55 °C to +150 °C).
Is SMB8J14CAHE3/5B suitable for automotive applications?
Yes, SMB8J14CAHE3/5B is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix indicating RoHS-compliant and AEC-Q101-qualified construction. It meets MSL Level 1, operates up to +150 °C junction temperature, and is validated for load-dump, jump-start, and ESD immunity per ISO 16750-2 and ISO 10605. The SMB8J14CAHE3/5B is commonly deployed in body control modules, ADAS camera interfaces, and powertrain sensor circuits.
How does the bidirectional configuration of SMB8J14CAHE3/5B affect its circuit placement?
The SMB8J14CAHE3/5B has no polarity marking and functions identically in both directions, allowing placement across any two points needing symmetric overvoltage protection - such as differential signal pairs (CAN H/L, RS-485), AC-coupled lines, or ungrounded power rails. Unlike unidirectional TVS diodes, the SMB8J14CAHE3/5B eliminates orientation errors during automated assembly and avoids the need for external biasing networks. Its symmetrical terminals simplify layout and reduce BOM complexity.
What is the thermal resistance of SMB8J14CAHE3/5B, and how does it impact PCB layout?
SMB8J14CAHE3/5B has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W and junction-to-ambient (RθJA) of 72 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe operation during repetitive surges, PCB layout must replicate this minimum pad area and use internal ground planes for heat spreading. Reducing pad size increases RθJA and risks thermal runaway during high-duty-cycle transients - a critical design constraint for the SMB8J14CAHE3/5B.
Does SMB8J14CAHE3/5B require derating at elevated ambient temperatures?
Yes, SMB8J14CAHE3/5B must be derated above TA = 25 °C per Figure 2 in Vishay document 88422. At 85 °C ambient, its peak pulse power (PPPM) drops to approximately 65% of the rated 800 W, and at 125 °C, it falls to ~40%. Derating applies to both unidirectional and bidirectional variants and is based on junction temperature limits (TJ ≤ 150 °C). Designers must apply this derating curve when sizing the SMB8J14CAHE3/5B for under-hood or enclosed industrial environments.
SMB8J14CAHE3/5B 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):
- 34.5A
- Power - Peak Pulse:
- 800W
- 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 (SMB)
SMB8J14CAHE3/5B FAQ
1.How can I place an order for SMB8J14CAHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J14CAHE3/5B 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 SMB8J14CAHE3/5B reliable?
The price and inventory of SMB8J14CAHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J14CAHE3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J14CAHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J14CAHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J14CAHE3/5B?
SMB8J14CAHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J14CAHE3/5B 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 SMB8J14CAHE3/5B?
For technical support, including SMB8J14CAHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J14CAHE3/5B requirements.
6.How does Aetrix verify that SMB8J14CAHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J14CAHE3/5B 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 SMB8J14CAHE3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J14CAHE3/5B?
All SMB8J14CAHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J14CAHE3/5B, 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 SMB8J14CAHE3/5B part is unused and in its original packaging.
Return procedure for SMB8J14CAHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J14CAHE3/5B Tags
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