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Vishay General Semiconductor - Diodes Division SMB8J30CA-M3/52
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- Part No.:
- SMB8J30CA-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J30CA-M3/52.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,360
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Product details
Overview
SMB8J30CA-M3/52 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 30 V standoff voltage (VWM), 33.3–36.8 V breakdown voltage (VBR), 48.4 V clamping voltage (VC) at 16.5 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 SMB8J30CA-M3/52 datasheet, SMB8J30CA-M3/52 pinout, SMB8J30CA-M3/52 application, or SMB8J30CA-M3/52 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance (M3 suffix), and thermal resistance (RθJA = 72 °C/W) for board-level reliability under repetitive surge stress.
Technical Context
This TVS diode uses a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its bidirectional architecture enables symmetrical clamping across both polarities without external polarity management, supporting robust protection of differential buses like CAN FD, RS-485, and automotive LIN lines.
The device operates over -55 °C to +150 °C junction temperature range and meets J-STD-020 MSL Level 1 (260 °C peak reflow). Its 72 °C/W junction-to-ambient thermal resistance requires minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad layout per terminal for rated 800 W pulse handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 30 V - maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 33.3–36.8 V at 1.0 mA - voltage at which device transitions from high-impedance to low-impedance clamping state |
| VC (Clamping Voltage) | 48.4 V at IPPM = 16.5 A - maximum voltage seen by protected circuit during 10/1000 μs surge; determines downstream component stress |
| PPPM (Peak Pulse Power) | 800 W - energy-handling capacity for standardized 10/1000 μs transient; defines single-event surge survivability |
| ID (Reverse Leakage) | 1.0 μA at VWM - ensures minimal standby power loss and signal integrity degradation in high-impedance circuits |
| TJ max. | +150 °C - enables operation in under-hood automotive and industrial environments without derating at full power |
| Package | SMB (DO-214AA) - surface-mount footprint compatible with automated placement; 2.20 mm × 3.94 mm × 1.95 mm body with matte tin leads |
Pinout & Package
SMB8J30CA-M3/52 uses the standard SMB (DO-214AA) package: two-terminal, non-polarized bidirectional device with no cathode marking. Terminals are matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; case meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically - bidirectional clamping allows connection across any two points needing voltage limiting, e.g., line-to-line or line-to-ground |
| Case (plastic body) | Thermal and mechanical interface | No electrical connection; provides mechanical anchoring and heat dissipation path via PCB copper pads (min. 5.0 mm × 5.0 mm per terminal) |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - suitable for engine control, ADAS sensor, and infotainment subsystems |
| Halogen-free & RoHS-compliant (M3 suffix) | Meets JEDEC J-STD-201 Class 2 whisker resistance and global environmental regulations - supports green manufacturing and end-of-life compliance |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ratio = 1.45) versus competing TVS diodes, reducing voltage overshoot during fast transients such as ISO 7637-2 pulse 1/2a/5a |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard 260 °C peak reflow without baking - simplifies SMT assembly and reduces production risk |
| Glass-passivated junction | Provides stable VBR tolerance (±5 % typical), low leakage (<1 μA), and long-term parameter stability under thermal cycling and humidity exposure |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
|
Use Scenario: Protecting CAN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching transients in 12 V/24 V vehicle systems. IC Role / Device Role: Bidirectional voltage clamp placed between signal line and ground or across differential pair to limit surge-induced overvoltage. Use Value: Clamps 800 W surges at ≤48.4 V while maintaining <1 μA leakage at 30 V - preserves signal fidelity and prevents MCU input latch-up during ISO 16750-2 testing. |
Use Scenario: Safeguarding RS-485 transceivers in factory automation PLCs against ESD (IEC 61000-4-2) and lightning-induced surges on long cable runs. IC Role / Device Role: Line-to-line and line-to-ground TVS array element providing symmetrical clamping on A/B differential pair. Use Value: 16.5 A IPPM and 48.4 V VC ensure transceiver survival under 4 kV EFT (IEC 61000-4-4) and 10/1000 μs induced surges up to 1 kV. |
| Consumer USB Port Protection | Telecom DSL Line Protection |
|
Use Scenario: Shielding USB 2.0 data lines (D+/D−) in set-top boxes and smart displays from human-body-model ESD events during hot-plug insertion. IC Role / Device Role: Low-capacitance bidirectional TVS placed directly at connector to shunt ESD current before reaching PHY IC. Use Value: Sub-1 μA leakage at 30 V avoids pull-up/pull-down interference; 48.4 V clamping prevents damage to 3.3 V tolerant USB PHY inputs during ±8 kV contact discharge. |
Use Scenario: Front-end surge suppression on ADSL/VDSL line cards exposed to induced surges from nearby power lines or lightning strikes. IC Role / Device Role: Primary protection device across tip/ring pair before gas discharge tube (GDT) and secondary filtering stage. Use Value: 800 W PPPM handles high-energy longitudinal surges; bidirectional symmetry matches AC-coupled telecom signaling without polarity concerns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30CA-M3/52 | Unidirectional variant with same VWM/VBR/VC but 1000 W PPPM and 20.7 A IPPM; lacks bidirectional symmetry | Requires explicit polarity assignment; unsuitable for AC or differential signal lines without series blocking diodes | Select only when unidirectional clamping suffices and higher 1000 W rating is required - e.g., DC power rail protection |
| SMCJ30CA-M3/52 | Larger SMC (DO-214AB) package; identical electrical specs but lower RθJA (35 °C/W) and higher 1500 W PPPM rating | Occupies ~2.5× PCB area; better suited for high-power industrial power supplies where thermal headroom is critical | Choose when board space permits and thermal performance must exceed SMB8J30CA-M3/52's 72 °C/W limit - e.g., 48 V telecom rectifier modules |
Compared with SMBJ30CA-M3/52 and SMCJ30CA-M3/52, SMB8J30CA-M3/52 delivers optimal balance of bidirectional functionality, compact SMB footprint, AEC-Q101 qualification, and 800 W surge handling - making it the preferred choice for space-constrained automotive and industrial signal-line protection where polarity-agnostic clamping is mandatory.
Availability
SMB8J30CA-M3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial RS-485 networks, consumer USB ports, and telecom DSL line protection requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for SMB8J30CA-M3/52 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, efficiency, and application-specific optimization.
SMB8J30CA-M3/52 belongs to Vishay's TRANSZORB® family of high-power-density TVS diodes, engineered specifically for automotive-grade transient suppression in harsh environments where AEC-Q101 compliance and consistent clamping performance are non-negotiable.
FAQ
What is the clamping voltage of SMB8J30CA-M3/52 at its rated peak pulse current?
The SMB8J30CA-M3/52 has a maximum clamping voltage (VC) of 48.4 V at 16.5 A peak pulse current (IPPM), measured under the standard 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is confirmed in Vishay's Document Number 88422, page 3 (bidirectional table). The SMB8J30CA-M3/52 maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMB8J30CA-M3/52 suitable for automotive applications?
Yes, SMB8J30CA-M3/52 is AEC-Q101 qualified and explicitly designated for automotive use, as indicated by the HM3 suffix (halogen-free, RoHS-compliant, AEC-Q101 qualified). It meets requirements for engine control units, ADAS sensors, and infotainment systems, including thermal cycling, humidity bias, and mechanical shock testing. The SMB8J30CA-M3/52 datasheet confirms qualification per AEC-Q101 Rev H in the Mechanical Data section.
How does the M3 suffix affect the compliance and reliability of SMB8J30CA-M3/52?
The M3 suffix on SMB8J30CA-M3/52 denotes halogen-free, RoHS-compliant construction with JESD 201 Class 2 whisker resistance and MSL Level 1 rating (260 °C peak reflow). This ensures compatibility with lead-free assembly processes, long-term interconnect reliability, and adherence to global environmental standards - critical for automotive and industrial deployments where material traceability and process robustness are mandated. The SMB8J30CA-M3/52 meets all these specifications per Vishay Document 88422.
What is the thermal resistance of SMB8J30CA-M3/52, and how does it impact PCB layout?
SMB8J30CA-M3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value requires designers to allocate sufficient copper area to dissipate heat during repetitive surge events; reducing pad size increases thermal impedance and de-rates the 800 W PPPM rating. The SMB8J30CA-M3/52 mounting pad layout is specified in Document 88422, page 5.
Does SMB8J30CA-M3/52 have polarity markings, and how is it connected in circuit?
No, SMB8J30CA-M3/52 is a bidirectional TVS diode with no polarity markings - the SMB (DO-214AA) package has symmetrical terminals and functions identically regardless of orientation. It is connected either line-to-ground or line-to-line to clamp voltage excursions in both directions. This eliminates orientation errors during automated placement and simplifies design for AC-coupled or differential interfaces. The SMB8J30CA-M3/52 datasheet confirms "no marking on bidirectional types" in the Mechanical Data section.
SMB8J30CA-M3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 16.5A
- Power - Peak Pulse:
- 800W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMB8J30CA-M3/52 FAQ
1.How can I place an order for SMB8J30CA-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J30CA-M3/52 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 SMB8J30CA-M3/52 reliable?
The price and inventory of SMB8J30CA-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J30CA-M3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J30CA-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J30CA-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J30CA-M3/52?
SMB8J30CA-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J30CA-M3/52 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 SMB8J30CA-M3/52?
For technical support, including SMB8J30CA-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J30CA-M3/52 requirements.
6.How does Aetrix verify that SMB8J30CA-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J30CA-M3/52 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 SMB8J30CA-M3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J30CA-M3/52?
All SMB8J30CA-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J30CA-M3/52, 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 SMB8J30CA-M3/52 part is unused and in its original packaging.
Return procedure for SMB8J30CA-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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