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Vishay General Semiconductor - Diodes Division SMB8J14CAHM3/I
- Part No.:
- SMB8J14CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J14CAHM3/I.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,542
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Product details
Overview
SMB8J14CAHM3/I 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 stand-off voltage (VWM), 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. It is AEC-Q101 qualified and halogen-free, targeting automotive sensor interface and power rail protection.
For engineers reviewing the SMB8J14CAHM3/I datasheet, SMB8J14CAHM3/I pinout, SMB8J14CAHM3/I application, or SMB8J14CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 14 V working voltage compatibility with 12 V automotive systems, thermal resistance (RθJA = 72 °C/W), and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within picoseconds to transients induced by load switching or ESD. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at VWM), while the SMB package supports automated SMT placement and meets MSL Level 1 (260 °C reflow).
The device complies with ANSI/IEEE C62.35 for surge testing and delivers consistent clamping performance across -55 °C to +150 °C junction temperature range. Its bidirectional symmetry enables use on AC-coupled or floating lines without polarity concerns, and its 20 °C/W junction-to-lead thermal resistance supports localized heat dissipation under surge conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before clamping begins; matches 12 V automotive nominal rails with margin. |
| VBR min/max | 15.6 V / 17.2 V - Breakdown occurs within this band at 1 mA test current; ensures reliable turn-on above normal operating voltage. |
| VC @ IPPM | 23.2 V - Clamped voltage during 34.5 A 10/1000 µs surge; defines maximum stress imposed on protected downstream circuitry. |
| PPPM | 800 W - Peak surge power handling capacity; determines survivability against ISO 7637-2 Pulse 1/2a/5a transients. |
| ID @ VWM | <1.0 µA - Reverse leakage at stand-off voltage; minimizes quiescent power loss and avoids false triggering. |
| TJ max | +150 °C - Maximum junction temperature rating; enables operation in under-hood automotive environments. |
| RθJA | 72 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs board-level thermal design requirements. |
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, J-STD-002 solderable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Bidirectional terminals - either end serves as anode or cathode depending on transient polarity; no color band or marking required. |
| Case (body) | Thermal and mechanical interface | Plastic molding provides UL 94 V-0 flammability rating and structural support; copper pad layout (min. 5.0 mm × 5.0 mm per terminal) required for rated power dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and surge endurance - required for engine control, ADAS, and body electronics. |
| Halogen-free (HM3 suffix) | Complies with automotive environmental standards (e.g., GMW3172, Ford WSS-M99P9999-A1) and eliminates corrosive halogen emissions during soldering or failure. |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ratio = 1.48) and faster energy diversion - critical for protecting sensitive CAN, LIN, and sensor ICs. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard 260 °C reflow profile without baking - simplifies SMT line integration and reduces manufacturing overhead. |
Applications
| Automotive Sensor Interface | Industrial CAN Bus Node |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, or position sensors in engine bay modules exposed to ISO 7637-2 load dump and inductive switching noise. IC Role / Device Role / Timing Role: Shunt-type transient clamp placed directly at sensor connector or ASIC input pins to limit voltage excursions below IC absolute maximum ratings. Use Value: Prevents latch-up or gate oxide damage in precision ADC front-ends by clamping surges to ≤23.2 V while maintaining <1 µA leakage at 14 V nominal supply. | Use Scenario: Safeguarding CAN transceiver inputs/outputs in factory automation controllers subjected to cable discharge events and ground bounce. IC Role / Device Role / Timing Role: Bidirectional overvoltage clamp on CAN_H and CAN_L lines, placed adjacent to transceiver to minimize inductance and preserve signal integrity. Use Value: Maintains bus communication continuity during 800 W transients without altering differential signaling characteristics due to symmetric clamping and low capacitance. |
| 12 V Power Rail Protection | Consumer Appliance Motor Drive |
Use Scenario: Guarding microcontroller I/O and PMIC enable lines connected to vehicle battery rail subject to jump-start spikes and alternator ripple. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between rail and protected node to absorb repetitive 10/1000 µs pulses up to 800 W without degradation. Use Value: Enables robust operation across full automotive temperature range (-40 °C to +125 °C ambient) with verified lifetime performance under AEC-Q101 stress conditions. | Use Scenario: Shielding MCU GPIOs and gate drivers in washing machine motor control boards from commutation-induced transients during brushless motor switching. IC Role / Device Role / Timing Role: Fast-response shunt protector on low-voltage control signals feeding half-bridge drivers, located within 2 mm of IC pins. Use Value: Eliminates need for additional RC snubbers or ferrites by providing sub-nanosecond response and 34.5 A surge current handling in compact SMB footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J14CAHE3/I | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | Acceptable for non-automotive industrial use where halogen content is unrestricted. | Select when cost optimization is prioritized and halogen-free requirement is absent. |
| SMAJ14CA | Lower PPPM (400 W), higher RθJA (110 °C/W), SMA package (smaller footprint, lower surge rating). | Suitable only for low-energy transients (e.g., USB, audio lines) - insufficient for ISO 7637-2 Pulse 5a. | Choose only for space-constrained consumer applications with <400 W surge exposure. |
Compared with SMB8J14CAHE3/I, the SMB8J14CAHM3/I adds halogen-free compliance for stricter automotive OEM specifications; compared with SMAJ14CA, it delivers double the surge power rating and superior thermal performance in a slightly larger but still industry-standard SMB package.
Availability
SMB8J14CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial CAN bus nodes, and 12 V power rail safeguarding requiring stable component supply, AEC-Q101 traceability, and halogen-free compliance.
Supply support for SMB8J14CAHM3/I 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 application-specific performance.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-power, automotive-grade transient suppression in harsh electromagnetic environments with focus on AEC-Q101 compliance and system-level robustness.
FAQ
What is the clamping voltage of SMB8J14CAHM3/I and how is it measured?
The SMB8J14CAHM3/I has a maximum clamping voltage (VC) of 23.2 V, measured at a peak pulse current (IPPM) of 34.5 A using a standardized 10/1000 µs double-exponential surge waveform. This value represents the upper voltage limit imposed on protected circuitry during worst-case transient events and is guaranteed per Vishay's datasheet test condition - not derived or estimated. The SMB8J14CAHM3/I achieves this clamping performance consistently across its rated temperature range.
Is SMB8J14CAHM3/I suitable for automotive applications?
Yes, SMB8J14CAHM3/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction - meeting Tier 1 automotive supplier requirements for under-hood and chassis-mounted electronics. Its -55 °C to +150 °C operating junction temperature range, validated surge endurance, and MSL Level 1 reflow compatibility make SMB8J14CAHM3/I appropriate for engine control units, body control modules, and ADAS sensor interfaces.
How does the bidirectional configuration of SMB8J14CAHM3/I affect PCB layout?
The SMB8J14CAHM3/I has symmetrical terminals with no polarity marking, allowing flexible orientation during placement - either end connects to the line being protected without regard to DC bias direction. This eliminates orientation errors in automated assembly and simplifies routing on bidirectional buses like CAN or RS-485. However, minimum 5.0 mm × 5.0 mm copper pads per terminal must be maintained per Vishay's thermal specification to sustain 800 W surge rating - a requirement independent of polarity.
What is the difference between SMB8J14CAHM3/I and SMB8J14CAHE3/I?
SMB8J14CAHM3/I and SMB8J14CAHE3/I share identical electrical parameters, AEC-Q101 qualification, and packaging, but differ in material composition: HM3 denotes halogen-free molding compound and terminations, whereas HE3 is RoHS-compliant but contains halogens. Both meet JESD201 Class 2 whisker resistance and J-STD-002 solderability. The SMB8J14CAHM3/I is specified where halogen-free compliance is mandatory - such as GM, Ford, or VW OEM programs.
Does SMB8J14CAHM3/I require derating at elevated ambient temperatures?
Yes, SMB8J14CAHM3/I must be derated above TA = 25 °C per Figure 2 in Vishay document 88422: peak pulse power decreases linearly to zero at +150 °C junction temperature. For example, at TA = 85 °C with typical board thermal resistance, usable PPPM drops to approximately 520 W. Designers must calculate actual TJ using RθJA = 72 °C/W and ensure sustained operation remains within the safe operating area defined in the datasheet - a requirement explicitly applicable to SMB8J14CAHM3/I.
SMB8J14CAHM3/I 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J14CAHM3/I FAQ
1.How can I place an order for SMB8J14CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J14CAHM3/I 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 SMB8J14CAHM3/I reliable?
The price and inventory of SMB8J14CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J14CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMB8J14CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J14CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J14CAHM3/I?
SMB8J14CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J14CAHM3/I 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 SMB8J14CAHM3/I?
For technical support, including SMB8J14CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J14CAHM3/I requirements.
6.How does Aetrix verify that SMB8J14CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMB8J14CAHM3/I 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 SMB8J14CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMB8J14CAHM3/I?
All SMB8J14CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J14CAHM3/I, 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 SMB8J14CAHM3/I part is unused and in its original packaging.
Return procedure for SMB8J14CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J14CAHM3/I Tags
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