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Vishay General Semiconductor - Diodes Division SMBJ8.5-E3/52
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- Part No.:
- SMBJ8.5-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5-E3/52.pdf
- Description:
- TVS DIODE 8.5VWM 15.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,437
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Product details
Overview
SMBJ8.5-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 14.4 V maximum clamping voltage (VC) at 41.7 A peak pulse current (IPPM), and 600 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMBJ8.5-E3/52 datasheet, SMBJ8.5-E3/52 pinout, SMBJ8.5-E3/52 application, or SMBJ8.5-E3/52 equivalent, key selection criteria include clamping performance under 41.7 A surge, thermal resistance (RθJA = 100 °C/W), unidirectional polarity with cathode band marking, and RoHS-compliant commercial-grade construction per J-STD-020 MSL Level 1.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches to divert transient energy away from downstream ICs or MOSFETs. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM).
The device is rated for repetitive 10/1000 µs pulses at 0.01% duty cycle and supports peak forward surge current (IFSM) of 100 A (8.3 ms half-sine), making it suitable for industrial motor drives and power supply input stages where fast response (<1 ns) and low incremental surge resistance are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line operating margin. |
| VBR (min/max) | 9.44 V / 10.4 V at IT = 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients. |
| VC @ IPPM | 14.4 V at 41.7 A - Clamped voltage seen by protected circuit during worst-case 600 W surge; limits stress on downstream components. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; validates robustness against IEC 61000-4-5 Level 4 surges. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs derating above 25 °C ambient. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in automotive under-hood and industrial control environments. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode identified by molded band at one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal (cathode-banded side is opposite) | Connected to ground or low-impedance return path; completes shunt path during transient events. |
| Cathode | Marked end (band), reverse-biased terminal during protection | Connected to protected line (e.g., 8.5 V rail); avalanche conduction occurs when voltage exceeds VBR relative to anode. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Validated for IEC 61000-4-5 surge immunity up to 4 kV (line-earth) with minimal PCB layout impact. |
| 14.4 V clamping at 41.7 A | Ensures protected 3.3 V or 5 V logic interfaces remain below absolute maximum ratings during ESD/EFT events. |
| MSL Level 1 (260 °C peak) | Enables compatibility with standard lead-free reflow profiles without moisture sensitivity concerns. |
| Glass-passivated junction | Delivers stable VBR over temperature and lifetime, with <1.0 µA leakage at 8.5 V for low-power sensor interfaces. |
Applications
| Industrial Motor Drive Inputs | Automotive Body Control Module (BCM) Power Rails |
|---|---|
|
Use Scenario: Protection of 12 V DC input stage against load dump and inductive kickback from relay coils and solenoids. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between VIN and GND, clamping transients before they reach DC-DC converters and microcontrollers. Use Value: Limits voltage excursion to ≤14.4 V during 41.7 A surges, preventing latch-up or gate oxide damage in downstream FETs and regulators. |
Use Scenario: Surge suppression on 5 V or 8.5 V power rails feeding CAN transceivers and LIN bus controllers. IC Role / Device Role / Timing Role: Primary overvoltage clamp on low-voltage domain, coordinated with upstream fuse and downstream LC filtering. Use Value: Maintains rail integrity during ISO 7637-2 Pulse 1/2a/5a events while meeting AEC-Q101 qualification requirements for automotive grade variants. |
| Consumer Power Adapter Outputs | Industrial Sensor Signal Lines |
|
Use Scenario: Output-side protection of 8.5 V wall adapters against AC line transients coupled through transformer leakage inductance. IC Role / Device Role / Timing Role: Final-stage TVS on secondary-side rectifier output, absorbing residual spikes not filtered by bulk capacitance. Use Value: Prevents overvoltage stress on USB-PD negotiation ICs or legacy 5 V/8.5 V linear regulators with tight VIN tolerance. |
Use Scenario: Protection of analog sensor outputs (e.g., pressure, temperature) connected to microcontroller ADC inputs. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 µA) unidirectional clamp referenced to system ground, preserving signal fidelity. Use Value: Enables sub-µA standby current compliance while clamping ESD events to <15 V, avoiding ADC saturation or input protection diode conduction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5A-M3/52 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package. | No functional difference; selected where halogen-free material compliance is mandated (e.g., EU medical devices). | Direct drop-in replacement for SMBJ8.5-E3/52 where halogen-free bill-of-materials is required. |
| SMBJ8.5AHE3_B/H | AEC-Q101 qualified, RoHS-compliant, same VWM/VBR/VC but rated for automotive temperature range (-55 °C to +150 °C) with enhanced reliability testing. | Required for automotive powertrain and chassis modules; not necessary for commercial-grade industrial use. | Preferred for automotive OEM designs needing qualification evidence; otherwise, SMBJ8.5-E3/52 suffices for non-automotive applications. |
Compared with SMBJ8.5A-M3/52 and SMBJ8.5AHE3_B/H, the SMBJ8.5-E3/52 provides standard commercial-grade TVS performance with RoHS compliance and MSL Level 1 reflow capability-ideal for cost-sensitive industrial and consumer power systems where halogen-free or automotive qualification are not mandated.
Availability
SMBJ8.5-E3/52 is available at Aetrix Electronics and suitable for industrial motor drives, consumer power adapters, and sensor interface circuits requiring stable component supply, consistent surge performance, and lead-free assembly compatibility.
Supply support for SMBJ8.5-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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series targets board-level transient protection across automotive, industrial, and computing markets, delivering high-power clamping in compact surface-mount packages for space-constrained and high-reliability designs.
FAQ
What is the maximum clamping voltage of SMBJ8.5-E3/52 under peak surge conditions?
The SMBJ8.5-E3/52 has a maximum clamping voltage (VC) of 14.4 V at 41.7 A peak pulse current (IPPM), measured with a 10/1000 µs waveform. This value represents the highest voltage the protected circuit will experience during a 600 W transient event, ensuring downstream components like 3.3 V or 5 V ICs remain within safe operating limits. The SMBJ8.5-E3/52 maintains this clamping performance across its specified temperature range.
Is SMBJ8.5-E3/52 suitable for automotive applications?
The SMBJ8.5-E3/52 is a commercial-grade, RoHS-compliant part and is not AEC-Q101 qualified. For automotive applications requiring qualification, Vishay offers the SMBJ8.5AHE3_B/H variant. The SMBJ8.5-E3/52 may be used in non-safety-critical automotive subsystems (e.g., infotainment power rails) only after full system-level validation-but the SMBJ8.5-E3/52 itself does not carry automotive qualification documentation.
How does the SMBJ8.5-E3/52 differ from bidirectional TVS diodes like SMBJ8.5CA?
The SMBJ8.5-E3/52 is unidirectional and features a cathode band marking; it conducts only in reverse breakdown, making it ideal for DC power line protection. In contrast, SMBJ8.5CA is bidirectional with no polarity marking and clamps in both directions-used for AC lines or data buses like RS-485. The SMBJ8.5-E3/52 has lower leakage (<1.0 µA) than bidirectional versions at VWM and is not interchangeable without circuit redesign.
What is the thermal resistance and power derating behavior of SMBJ8.5-E3/52?
The SMBJ8.5-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W on standard 0.2" × 0.2" copper pads. Its peak pulse power (600 W) must be derated above 25 °C ambient per Figure 2 in the datasheet; at 75 °C, usable PPPM drops to ~420 W. Continuous power dissipation (PD) is limited to 5.0 W, but this applies only to steady-state conditions-not transient suppression.
Can SMBJ8.5-E3/52 be used in place of SMAJ8.5A?
No-SMBJ8.5-E3/52 uses the SMB (DO-214AA) package (typical footprint 4.57 mm × 3.94 mm), while SMAJ8.5A uses the smaller SMA (DO-214AC) package (4.06 mm × 2.44 mm). Though both offer similar electrical specs, the SMBJ8.5-E3/52 requires larger PCB pads and higher mounting torque; direct substitution would cause solder joint reliability issues and violate IPC-7351 pad recommendations. The SMBJ8.5-E3/52 is not a drop-in replacement for SMAJ8.5A.
SMBJ8.5-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 15.9V
- Current - Peak Pulse (10/1000µs):
- 37.7A
- Power - Peak Pulse:
- 600W
- 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)
SMBJ8.5-E3/52 FAQ
1.How can I place an order for SMBJ8.5-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5-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 SMBJ8.5-E3/52 reliable?
The price and inventory of SMBJ8.5-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 SMBJ8.5-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ8.5-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5-E3/52?
SMBJ8.5-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5-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 SMBJ8.5-E3/52?
For technical support, including SMBJ8.5-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5-E3/52 requirements.
6.How does Aetrix verify that SMBJ8.5-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5-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 SMBJ8.5-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ8.5-E3/52?
All SMBJ8.5-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5-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 SMBJ8.5-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ8.5-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5-E3/52 Tags
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