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Vishay General Semiconductor - Diodes Division SMBJ8.5HE3/52
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- Part No.:
- SMBJ8.5HE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5HE3/52.pdf
- Description:
- TVS DIODE 8.5VWM 15.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,186
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Product details
Overview
SMBJ8.5HE3/52 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 ESD, lightning-induced surges, and inductive switching transients. It features a 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 14.4 V clamping voltage (VC) at 41.7 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMBJ8.5HE3/52 datasheet, SMBJ8.5HE3/52 pinout, SMBJ8.5HE3/52 application, or SMBJ8.5HE3/52 equivalent, key selection criteria include clamping performance under 41.7 A surge, AEC-Q101 qualification for automotive use, unidirectional polarity with cathode band marking, and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 µA leakage at 8.5 V), then rapidly avalanches below 1 ns to divert transient energy away from downstream ICs or MOSFETs. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance.
The device is rated for repetitive 600 W pulses (10/1000 µs, 0.01% duty cycle), derated above 25 °C per Fig. 2, with thermal resistance RθJA = 100 °C/W and RθJL = 20 °C/W. It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before significant leakage 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 overvoltage events. |
| VC @ IPPM | 14.4 V at 41.7 A - Clamped voltage seen by protected circuit during full 600 W transient; critical for IC-level voltage tolerance. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; validates robustness against common surge standards (IEC 61000-4-5). |
| IPPM | 41.7 A - Peak surge current capability; determines minimum trace width and layout clearance needed for effective protection. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and industrial enclosures. |
| Leakage ID | 20 µA max. at VWM - Low standby current preserves signal integrity and battery life in always-on circuits. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by molded band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line (e.g., power rail or signal); conducts surge current to ground when VWM exceeded. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or lower-potential return path; completes shunt path for transient energy dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - enables use in ADAS, body control, and infotainment modules. |
| 600 W peak pulse power (10/1000 µs) | Withstands high-energy transients per ISO 7637-2 Pulse 1/2a/5a without degradation - suitable for 12 V/24 V vehicle electrical systems. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on protected ICs - critical for safeguarding 3.3 V or 5 V logic interfaces adjacent to noisy power domains. |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT reflow profiles without preconditioning - eliminates moisture sensitivity handling overhead in production. |
| Glass passivated junction | Ensures stable VBR over lifetime and temperature; reduces parameter drift vs. epoxy-passivated alternatives in harsh environments. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from load-dump and jump-start transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between VBAT and ground, triggered within <1 ns to limit voltage to ≤14.4 V during 41.7 A surge. Use Value: Prevents latch-up or gate oxide damage in automotive MCUs and transceivers while maintaining AEC-Q101 compliance. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) connected to PLC input modules in factory automation. IC Role / Device Role / Timing Role: Reverse-biased across sensor signal and ground to clamp ESD and inductive kickback from solenoid drivers. Use Value: Maintains sub-µA leakage at 8.5 V stand-off, preserving sensor accuracy while suppressing >1 kV HBM transients. |
| Consumer USB Port ESD Protection | Telecom DC Power Input Protection |
|
Use Scenario: Secondary-level ESD protection on VUSB lines of portable devices where primary TVS is upstream. IC Role / Device Role / Timing Role: Fast-response unidirectional clamp limiting voltage overshoot during ±8 kV contact discharge (IEC 61000-4-2). Use Value: Delivers 14.4 V clamping at 41.7 A with <1 ns response - complements slower polymer-based primary protectors. |
Use Scenario: Surge suppression on -48 V telecom power feeds exposed to lightning-induced surges in outdoor cabinets. IC Role / Device Role / Timing Role: Mounted between -48 V rail and chassis ground to absorb 600 W transients without thermal runaway. Use Value: Enables compact, low-cost protection with 100 °C/W thermal resistance - simplifies heatsinking in space-constrained telecom rectifiers. |
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-E3/52 | Commercial-grade (non-AEC-Q101), same VWM, VBR, VC, and PPPM; identical SMB package and pinout. | Not qualified for automotive use; suitable for consumer or industrial equipment without automotive certification requirements. | Select when AEC-Q101 is not mandated and cost optimization is prioritized. |
| SAC8.5 | Same 8.5 V VWM but lower 400 W PPPM; smaller SOD-123FL package; higher VC (15.0 V) at lower IPPM (26.7 A). | Better suited for space-constrained PCBs with lower surge exposure; insufficient for ISO 7637-2 Pulse 5a compliance. | Choose for compact consumer designs where 600 W headroom is unnecessary and board area is critical. |
Compared with SMBJ8.5A-E3/52, SMBJ8.5HE3/52 adds AEC-Q101 qualification without sacrificing electrical specs; versus SAC8.5, it delivers 50% higher surge power and tighter clamping in a slightly larger but more robust SMB package - making it optimal for automotive and industrial applications demanding proven reliability.
Availability
SMBJ8.5HE3/52 is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC I/O modules, telecom power supplies, and consumer USB power delivery circuits requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ8.5HE3/52 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 performance.
The SMBJ series is part of Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-energy transient suppression in automotive, industrial, and communications infrastructure where consistent clamping, AEC-Q101 validation, and SMT manufacturability are essential.
FAQ
What is the maximum clamping voltage of SMBJ8.5HE3/52 under surge conditions?
The SMBJ8.5HE3/52 has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current of 41.7 A using the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that protected downstream circuitry will not experience voltage exceeding 14.4 V during a full 600 W transient event. The SMBJ8.5HE3/52 maintains this clamping performance across its specified operating temperature range.
Is SMBJ8.5HE3/52 suitable for automotive applications?
Yes, SMBJ8.5HE3/52 is AEC-Q101 qualified, meaning it has passed rigorous stress tests including temperature cycling, high-temperature operating life, and ESD robustness required for automotive electronic systems. Its 150 °C maximum junction temperature, MSL Level 1 reflow compatibility, and validated surge performance make SMBJ8.5HE3/52 appropriate for engine control units, body electronics, and ADAS sensors. The "HE3" suffix explicitly denotes AEC-Q101 qualification.
How does the SMBJ8.5HE3/52 differ from the SMBJ8.5A-E3/52?
The SMBJ8.5HE3/52 and SMBJ8.5A-E3/52 share identical electrical specifications (VWM, VBR, VC, PPPM) and SMB (DO-214AA) package, but only SMBJ8.5HE3/52 is AEC-Q101 qualified. The "HE3" suffix indicates automotive-grade screening and testing, while "E3" denotes commercial-grade RoHS-compliant parts. Both are unidirectional and cathode-banded, but SMBJ8.5HE3/52 is required for automotive production where qualification evidence is mandatory.
What is the reverse leakage current of SMBJ8.5HE3/52 at its stand-off voltage?
The SMBJ8.5HE3/52 exhibits a maximum reverse leakage current (ID) of 20 µA at its 8.5 V stand-off voltage (VWM) and 25 °C ambient temperature. This low leakage preserves signal integrity in high-impedance sensor interfaces and minimizes quiescent power loss in battery-powered systems. Leakage remains below 100 µA up to 80% of VWM, ensuring stable operation across typical operating margins.
Can SMBJ8.5HE3/52 be used in bidirectional protection circuits?
No, SMBJ8.5HE3/52 is a unidirectional TVS diode, identifiable by its cathode band marking. For bidirectional protection, Vishay specifies the CA-suffixed variant (e.g., SMBJ8.5CA). Using SMBJ8.5HE3/52 in a bidirectional configuration would result in forward conduction during negative transients, potentially damaging the device or failing to clamp. Always match polarity: SMBJ8.5HE3/52 for DC rails with defined polarity; SMBJ8.5CA for AC-coupled or floating signal lines.
SMBJ8.5HE3/52 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ8.5HE3/52 FAQ
1.How can I place an order for SMBJ8.5HE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5HE3/52 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 SMBJ8.5HE3/52 reliable?
The price and inventory of SMBJ8.5HE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ8.5HE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ8.5HE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5HE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5HE3/52?
SMBJ8.5HE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5HE3/52 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 SMBJ8.5HE3/52?
For technical support, including SMBJ8.5HE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5HE3/52 requirements.
6.How does Aetrix verify that SMBJ8.5HE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5HE3/52 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 SMBJ8.5HE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ8.5HE3/52?
All SMBJ8.5HE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5HE3/52, 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 SMBJ8.5HE3/52 part is unused and in its original packaging.
Return procedure for SMBJ8.5HE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5HE3/52 Tags
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