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Vishay General Semiconductor - Diodes Division SMBJ30CAHE3/52
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- Part No.:
- SMBJ30CAHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ30CAHE3/52.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,027
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Product details
Overview
SMBJ30CAHE3/52 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 power and signal lines. It features 30 V stand-off voltage (VWM), 48.4 V maximum clamping voltage at 12.4 A peak pulse current, and 600 W peak pulse power capability with 10/1000 µs waveform - deployed in industrial sensor interfaces and automotive body control modules.
For engineers reviewing the SMBJ30CAHE3/52 datasheet, SMBJ30CAHE3/52 pinout, SMBJ30CAHE3/52 application, or SMBJ30CAHE3/52 equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamping protection device across bidirectional signal or DC bus lines, responding to transient overvoltages within <1 ps. Its glass-passivated junction ensures stable breakdown behavior, while the low incremental surge resistance enables consistent clamping under repetitive 10/1000 µs surges at 0.01% duty cycle.
The SMBJ30CAHE3/52 is rated for -55 °C to +150 °C operating junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C peak reflow profile. Its bidirectional structure eliminates polarity concerns in AC-coupled or floating lines, and its 0.099 %/°C VBR temperature coefficient ensures predictable voltage drift across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin below breakdown. |
| VBR min/max | 33.3 V / 36.8 V at 1.0 mA - Verified breakdown voltage range ensures reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 48.4 V at 12.4 A - Clamping voltage under 600 W 10/1000 µs surge; determines maximum stress imposed on protected IC or MOSFET. |
| PPPM | 600 W - Peak pulse power handling capacity; supports robust protection against lightning-induced or inductive-switching surges. |
| IPPM | 12.4 A - Peak pulse current capability with 10/1000 µs waveform; directly correlates with surge energy absorption (E ≈ 1.25 J). |
| TJ max | +150 °C - Maximum junction temperature rating; enables operation in under-hood automotive or high-ambient industrial environments. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs derating above 25 °C ambient. |
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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Accepts surge current from either direction; connects to line being protected (e.g., CAN_H or RS-485 A). |
| Cathode | Transient current entry (bidirectional) | Completes low-impedance path to ground or reference rail during clamping; symmetric with Anode in CA devices. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 Level 4 (4 kV surge) on 12 V systems with appropriate series impedance. |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive applications including body electronics, infotainment power rails, and sensor supply lines per stress test requirements. |
| Low-profile SMB package | 0.086" height allows use in space-constrained PCB layouts while maintaining 0.2" × 0.2" thermal pad compatibility for manufacturability. |
| 100 % surge-tested | Each unit verified for clamping performance at rated IPPM, ensuring field reliability without batch-level screening exceptions. |
| MSL Level 1 moisture sensitivity | Permits unlimited floor life and standard reflow without baking, reducing production overhead in high-volume SMT lines. |
Applications
| Automotive Body Control Module | Industrial RS-485 Communication Line |
|---|---|
|
Use Scenario: Protects microcontroller I/O and power rails from load-dump and jump-start transients in door module ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between 12 V supply and ground, shunting surges before they reach LDOs or MCU pins. Use Value: Limits voltage excursion to ≤48.4 V during 12 V system surges, preventing latch-up or gate oxide damage in 3.3 V/5 V logic interfaces. |
Use Scenario: Shields differential RS-485 transceivers from ESD and cable discharge events in factory automation networks. IC Role / Device Role / Timing Role: Connected across A–B differential pair and referenced to local ground, absorbing common-mode transients up to ±30 kV contact ESD. Use Value: Maintains signal integrity by clamping transients within 1 ns, avoiding data corruption or transceiver latch-up during field deployment. |
| Consumer Appliance Motor Drive Board | Telecom Power Input Stage |
|
Use Scenario: Guards MCU reset and ADC input lines against back-EMF spikes from brushed DC motor commutation. IC Role / Device Role / Timing Role: Placed at motor driver output filter node, clamping inductive kickback before it couples into analog sensing circuitry. Use Value: Reduces post-spike recovery time by limiting overshoot to 48.4 V, enabling faster system reset and eliminating false trigger events. |
Use Scenario: Installed at AC/DC adapter input to suppress lightning-induced surges entering telecom base station power supplies. IC Role / Device Role / Timing Role: First-stage clamping device ahead of bridge rectifier and bulk capacitor, diverting surge energy to chassis ground. Use Value: Withstands 600 W pulses without degradation, extending upstream fuse and rectifier lifetime in outdoor-installed equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30CA-M3/52 | Halogen-free, RoHS-compliant, commercial-grade (non-AEC-Q101) | Lacks automotive qualification; suitable for industrial/commercial designs where AEC compliance is not mandated. | Select when cost sensitivity outweighs automotive qualification requirements and thermal derating margins allow non-automotive grade. |
| SAC30CA | Same VWM/VC specs but in SMC (DO-214AB) package; higher RθJA (80 °C/W) and larger footprint (7.11 mm × 6.22 mm) | Requires PCB layout change; better suited for higher-power or lower-thermal-resistance needs where board space permits. | Choose only if higher surge current handling (>20 A) or improved thermal dissipation is required and package size is acceptable. |
Compared with SMBJ30CAHE3/52, the SMBJ30CA-M3/52 offers identical electrical performance without AEC-Q101 validation, while SAC30CA trades compact SMB size for enhanced thermal capability in a larger SMC package - making SMBJ30CAHE3/52 optimal for space-constrained automotive and industrial SMT designs requiring certified reliability.
Availability
SMBJ30CAHE3/52 is available at Aetrix Electronics and suitable for automotive body electronics, industrial communication interfaces, and consumer appliance motor control systems requiring stable component supply and AEC-Q101 traceability.
Supply support for SMBJ30CAHE3/52 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 high-volume manufacturability.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where repeatable clamping performance and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMBJ30CAHE3/52 at its rated peak pulse current?
The SMBJ30CAHE3/52 has a maximum clamping voltage (VC) of 48.4 V at 12.4 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value defines the upper voltage limit imposed on protected circuitry during surge events and is measured per ANSI/IEEE C62.35 standards. The SMBJ30CAHE3/52 maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C) due to its specified 0.099 %/°C VBR temperature coefficient.
Is SMBJ30CAHE3/52 suitable for automotive applications?
Yes, SMBJ30CAHE3/52 is AEC-Q101 qualified, as confirmed by its HE3 suffix and documentation in Vishay's 88392 datasheet. It undergoes stress testing for high-temperature reverse bias, temperature cycling, and mechanical shock per AEC-Q101 requirements. The SMBJ30CAHE3/52 is deployed in automotive body control modules, sensor supply protection, and infotainment power rails where validated reliability under vibration and thermal cycling is essential.
How does the bidirectional design of SMBJ30CAHE3/52 affect its circuit implementation?
The bidirectional configuration of SMBJ30CAHE3/52 means it functions identically in both polarities - no cathode band marking is present, and it clamps transients regardless of voltage polarity. This eliminates orientation errors during SMT placement and simplifies protection of AC-coupled lines (e.g., RS-485, CAN, audio) or floating DC buses. Unlike unidirectional variants, SMBJ30CAHE3/52 does not conduct forward current; its conduction occurs only during overvoltage excursions in either direction.
What is the thermal resistance of SMBJ30CAHE3/52, and how does it impact layout?
The SMBJ30CAHE3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard JEDEC test conditions and dictates derating above 25 °C ambient - for example, at 85 °C ambient, its usable power must be reduced by ~60 %. To maintain reliability, PCB layout must replicate the recommended pad dimensions and avoid excessive copper isolation around the SMBJ30CAHE3/52 terminals.
Can SMBJ30CAHE3/52 replace SMBJ30AHE3/52 in existing designs?
No - SMBJ30CAHE3/52 is bidirectional, while SMBJ30AHE3/52 is unidirectional with a cathode band and forward voltage drop (~3.5 V at 50 A). Substituting them without circuit review risks unintended conduction on negative transients or failure to clamp reverse-polarity surges. The SMBJ30CAHE3/52 requires symmetric placement across a line and ground, whereas SMBJ30AHE3/52 must be oriented with cathode toward the protected side. Always verify polarity and clamping symmetry before interchange.
SMBJ30CAHE3/52 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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 12.4A
- 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)
SMBJ30CAHE3/52 FAQ
1.How can I place an order for SMBJ30CAHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ30CAHE3/52 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 SMBJ30CAHE3/52 reliable?
The price and inventory of SMBJ30CAHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ30CAHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ30CAHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ30CAHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ30CAHE3/52?
SMBJ30CAHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ30CAHE3/52 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 SMBJ30CAHE3/52?
For technical support, including SMBJ30CAHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ30CAHE3/52 requirements.
6.How does Aetrix verify that SMBJ30CAHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ30CAHE3/52 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 SMBJ30CAHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ30CAHE3/52?
All SMBJ30CAHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ30CAHE3/52, 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 SMBJ30CAHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ30CAHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ30CAHE3/52 Tags
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