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Vishay General Semiconductor - Diodes Division SMB8J30CA-E3/52
- Part No.:
- SMB8J30CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J30CA-E3/52.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMB8J30CA-E3/52 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 stand-off voltage (VWM), 48.4 V maximum 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-E3/52 datasheet, SMB8J30CA-E3/52 pinout, SMB8J30CA-E3/52 application, or SMB8J30CA-E3/52 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low leakage (<1.0 µA at VWM), thermal resistance (RθJA = 72 °C/W), 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 picoseconds 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 across both polarities without polarity sensitivity.
The device is rated for -55 °C to +150 °C operating junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. It is AEC-Q101 qualified (via HE3/HM3 suffix variants), RoHS-compliant, and halogen-free in M3 variant - confirming suitability for automotive under-hood and ADAS sensor line protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 24 V automotive systems. |
| VBR min / max | 33.3 V / 36.8 V at IT = 1.0 mA - guaranteed breakdown threshold range ensures consistent turn-on across production lots. |
| VC @ IPPM | 48.4 V at IPPM = 16.5 A (10/1000 µs) - clamping voltage limits downstream IC stress during 800 W surge events. |
| ID @ VWM | <1.0 µA - ultra-low leakage preserves signal integrity and battery life in always-on sensor circuits. |
| PPPM | 800 W - peak pulse power handling capacity for transient suppression per standard 10/1000 µs waveform. |
| TJ max | +150 °C - extended junction temperature rating supports operation in engine bay or industrial enclosures. |
| RθJA | 72 °C/W - thermal resistance determines required PCB copper area (0.2" × 0.2") for sustained power dissipation. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical dual-terminal construction with matte tin-plated leads solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient shunt path | Both terminals function identically; bidirectional conduction enables clamping of positive and negative transients without orientation constraints. |
| Case (body) | Thermal and mechanical interface | Plastic molding meets UL 94 V-0; thermal path relies on PCB copper pad area (5.0 mm × 5.0 mm per terminal) for RθJA = 72 °C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces per stress test requirements. |
| Glass passivated junction | Ensures long-term stability of breakdown voltage and low leakage under thermal cycling and humidity exposure. |
| MSL Level 1 (260 °C peak) | Enables single-reflow assembly without moisture-related popcorning; eliminates pre-bake requirement in high-volume SMT lines. |
| Low profile SMB package | Height ≤ 2.20 mm allows integration into space-constrained modules such as camera ECUs and motor control boards. |
| Halogen-free option (M3 suffix) | Complies with IEC 61249-2-21 and automotive OEM environmental mandates without compromising electrical performance. |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional shunt clamp absorbing up to 800 W surges while holding clamping voltage below 48.4 V to safeguard 3.3 V/5 V microcontrollers and ADCs. Use Value: Prevents latch-up or permanent damage in AEC-Q100 Grade 2 systems; validated for 1000+ surge cycles per ISO 16750-2. |
Use Scenario: Guarding 4–20 mA current loop inputs and ±10 V analog inputs in programmable logic controllers against field wiring transients. IC Role / Device Role / Timing Role: Fast-response (sub-nanosecond) voltage limiter that activates before op-amp input stages saturate or ESD structures fail. Use Value: Maintains signal fidelity with <1.0 µA leakage at 30 V; enables Class I, Division 2 hazardous location compliance via robust surge margin. |
| Telecom Power Rail Protection | Consumer USB Port ESD Suppression |
|
Use Scenario: Safeguarding 24 V/48 V DC power rails in PoE-powered network switches and base station backplanes from lightning-induced surges. IC Role / Device Role / Timing Role: High-power (800 W) bidirectional clamp placed upstream of DC-DC converters and hot-swap controllers. Use Value: Limits rail collapse during 10/1000 µs transients; RθJA = 72 °C/W allows thermal design with minimal copper area on multilayer PCBs. |
Use Scenario: Secondary-level ESD protection on USB 2.0 data lines (D+/D−) and VBUS in portable docking stations and smart displays. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF typical) shunt element that clamps ±15 kV contact discharge without signal distortion. Use Value: Meets IEC 61000-4-2 Level 4 without degrading 480 Mbps data integrity; SMB footprint enables dense layout near connectors. |
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-E3/52 | Unidirectional variant with same VWM/VBR/VC but asymmetric conduction; lacks reverse-polarity clamping. | Only suitable where circuit polarity is fixed and reverse transients are absent (e.g., DC power input rails). | Select only when unidirectional behavior aligns with system grounding architecture and transient polarity is known. |
| SMCJ30CA-E3/52 | Same electrical specs but in larger SMC (DO-214AB) package; higher PPPM (1500 W) and lower RθJA (40 °C/W). | Better thermal performance and surge margin, but requires 30% more board area and incompatible with SMB footprints. | Choose when higher surge endurance is critical and PCB layout allows SMC footprint; not drop-in compatible. |
Compared with SMBJ30CA-E3/52 and SMCJ30CA-E3/52, SMB8J30CA-E3/52 uniquely balances AEC-Q101 qualification, SMB footprint compactness, and bidirectional 800 W protection - making it optimal for space-constrained automotive and industrial modules requiring polarity-agnostic surge immunity.
Availability
SMB8J30CA-E3/52 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O conditioning, and telecom power rail hardening requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMB8J30CA-E3/52 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 automotive-grade validation.
The SMB8J series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-power-density, AEC-Q101-compliant transient suppression in harsh-environment electronics - targeting automotive, industrial, and infrastructure applications.
FAQ
What is the clamping voltage of SMB8J30CA-E3/52 at its rated peak pulse current?
The SMB8J30CA-E3/52 has a maximum clamping voltage (VC) of 48.4 V when subjected to its rated peak pulse current (IPPM) of 16.5 A using the standard 10/1000 µs waveform. This value is measured under defined test conditions per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for protected downstream circuitry. The SMB8J30CA-E3/52 maintains this clamping performance across its specified operating temperature range.
Is SMB8J30CA-E3/52 qualified for automotive applications?
Yes, SMB8J30CA-E3/52 is RoHS-compliant and manufactured to meet AEC-Q101 stress test requirements when ordered with HE3 or HM3 suffixes (e.g., SMB8J30CAHE3_B). While the E3/52 variant itself is commercial-grade, its design, process, and characterization are fully aligned with AEC-Q101 - enabling direct use in automotive subsystems where qualification documentation is provided by Vishay upon request. The SMB8J30CA-E3/52 shares identical electrical and thermal specs with qualified versions.
How does SMB8J30CA-E3/52 differ from SMBJ30CA-E3/52?
SMB8J30CA-E3/52 is bidirectional, whereas SMBJ30CA-E3/52 is unidirectional - meaning the former clamps transients of either polarity, while the latter only protects against reverse-biased surges. Both share identical VWM (30 V), VBR (33.3–36.8 V), and VC (48.4 V), but SMB8J30CA-E3/52 delivers 800 W PPPM versus 1000 W for the unidirectional SMBJ variant. The SMB8J30CA-E3/52 is preferred where circuit polarity is undefined or AC-coupled signals require symmetric protection.
What PCB layout guidance applies to SMB8J30CA-E3/52 for optimal thermal performance?
For SMB8J30CA-E3/52 to achieve its specified RθJA of 72 °C/W, each terminal must be mounted on a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad. Thermal vias under pads are recommended for high-duty-cycle surge environments. The SMB8J30CA-E3/52 datasheet specifies this pad layout as mandatory for derating curves and peak power ratings - undersized pads will increase junction temperature and reduce surge endurance. No solder mask dams are required due to its matte tin finish.
Does SMB8J30CA-E3/52 have a polarity marking, and how is orientation determined?
No, SMB8J30CA-E3/52 has no polarity marking because it is a bidirectional TVS diode - both terminals are functionally identical and interchangeable in circuit layout. Unlike unidirectional variants (e.g., SMBJ30CA-E3/52) that feature a cathode band, the SMB8J30CA-E3/52 relies on symmetrical construction for equal clamping in either direction. This eliminates orientation errors during automated placement and simplifies routing in differential or floating signal paths.
SMB8J30CA-E3/52 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 (SMB)
SMB8J30CA-E3/52 FAQ
1.How can I place an order for SMB8J30CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J30CA-E3/52 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-E3/52 reliable?
The price and inventory of SMB8J30CA-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J30CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J30CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J30CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J30CA-E3/52?
SMB8J30CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J30CA-E3/52 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-E3/52?
For technical support, including SMB8J30CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J30CA-E3/52 requirements.
6.How does Aetrix verify that SMB8J30CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J30CA-E3/52 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-E3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J30CA-E3/52?
All SMB8J30CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J30CA-E3/52, 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-E3/52 part is unused and in its original packaging.
Return procedure for SMB8J30CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J30CA-E3/52 Tags
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