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Vishay General Semiconductor - Diodes Division SMBJ8.5AHE3/5B
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- Part No.:
- SMBJ8.5AHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5AHE3/5B.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,717
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Product details
Overview
SMBJ8.5AHE3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping inductive switching transients and ESD events on power and signal lines. It features 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 - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies and automotive control modules.
For engineers reviewing the SMBJ8.5AHE3/5B datasheet, SMBJ8.5AHE3/5B pinout, SMBJ8.5AHE3/5B application, or SMBJ8.5AHE3/5B equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), junction temperature range (–55 to +150 °C), and compliance with UL 497B surge protector classification.
Technical Context
This TVS diode operates as a voltage-clamping protection device in series with sensitive downstream circuitry, conducting only when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable leakage performance and fast response (<1 ns), while the low incremental surge resistance minimizes voltage overshoot during transient events.
The SMBJ8.5AHE3/5B is rated for 600 W peak pulse power under standardized 10/1000 μs waveform, with derating above 25 °C per Fig. 2 of the datasheet. Its 1.0 μA max reverse leakage at VWM enables compatibility with low-power sensor bias networks and high-impedance analog inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before clamping begins; sets upper limit for normal circuit operation. |
| VBR min/max | 9.44 V / 10.4 V at IT = 1 mA - defines guaranteed breakdown window; ensures predictable turn-on across production lots. |
| VC @ IPPM | 14.4 V at 41.7 A - clamped voltage seen by protected device during worst-case 10/1000 μs surge; determines minimum safe margin for downstream ICs. |
| PPPM | 600 W - peak transient energy absorption capability; supports robust protection against IEC 61000-4-5 Level 3 surges. |
| ID @ VWM | 1.0 μA max - ultra-low leakage preserves signal integrity and battery life in always-on sensor nodes. |
| TJ max | +150 °C - enables use in under-hood automotive environments and enclosed industrial enclosures without forced cooling. |
| RθJA | 100 °C/W - thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs PCB layout and power derating. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and J-STD-002 solderability requirements. Polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient conduction path anode-to-cathode during overvoltage | Connected to protected line; conducts surge current to ground when reverse voltage exceeds VBR. |
| Anode | Reference node / return path | Typically tied to system ground or low-impedance return plane; completes clamping loop during transient event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control units and ADAS power rails. |
| 600 W peak pulse power | Withstands repetitive 10/1000 μs transients at 0.01% duty cycle - protects against load dump and inductive kick in 12 V/24 V systems. |
| Glass passivated junction | Ensures stable VBR and low leakage over time and temperature - critical for long-life industrial equipment and medical sensors. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without preconditioning - simplifies SMT manufacturing and reduces process risk. |
| UL 497B recognized (QVGQ2) | Meets Underwriters Laboratories requirements for telecom and data line protectors - supports certification of end-equipment safety compliance. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppressing load dump transients on 12 V battery-fed microcontroller power rails in body control modules. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between VBAT and regulator input to limit voltage excursion to ≤14.4 V. Use Value: Prevents regulator latch-up or internal LDO failure during ISO 16750-2 pulse 5a events up to 35 V/100 ms. |
Use Scenario: Guarding analog output pins of pressure sensors exposed to ESD in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Low-leakage TVS shunting ESD pulses from 4–20 mA current loop outputs to ground. Use Value: Maintains <1 μA leakage at 8.5 V to avoid disturbing precision current sourcing accuracy. |
| Telecom Line Surge Suppression | Consumer Power Adapter Input Protection |
|
Use Scenario: Protecting Ethernet PHY power pins against lightning-induced surges in PoE-powered access points. IC Role / Device Role / Timing Role: Primary clamping element on 3.3 V/5 V auxiliary supply lines upstream of DC-DC converters. Use Value: Limits clamped voltage to 14.4 V - well below 16 V absolute maximum rating of typical buck controller ICs. |
Use Scenario: Safeguarding AC-DC adapter primary-side rectifier output against mains-borne surges. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor to clamp switch-mode transient spikes. Use Value: Absorbs 600 W peak energy without degradation - extends capacitor lifetime and prevents rectifier overstress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5A-E3/5B | No AEC-Q101 qualification; commercial grade only; identical electrical specs and SMB package. | Limited to non-automotive industrial or consumer use where automotive reliability testing is not required. | Select when cost sensitivity outweighs need for automotive qualification and full traceability. |
| SMCJ8.5AHE3/5B | Same VWM/VBR/VC but in larger SMC (DO-214AB) package; higher RθJA (60 °C/W) and 1500 W PPPM rating. | Better suited for higher-energy surges (e.g., IEC 61000-4-5 Level 4); requires larger PCB footprint and different pad layout. | Choose when system-level surge test requirements exceed 600 W or thermal budget demands lower junction rise. |
Compared with SMBJ8.5A-E3/5B, the SMBJ8.5AHE3/5B adds AEC-Q101 validation for automotive deployment; versus SMCJ8.5AHE3/5B, it trades peak power headroom for space-constrained layouts where 600 W suffices and board area is premium.
Availability
SMBJ8.5AHE3/5B is available at Aetrix Electronics and suitable for automotive control units, industrial sensor interfaces, telecom power rails, and consumer power adapter designs requiring stable component supply with full AEC-Q101 traceability and RoHS compliance.
Supply support for SMBJ8.5AHE3/5B 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 is engineered for robust transient suppression in space-constrained, high-reliability applications - particularly automotive, industrial, and telecom systems where consistent clamping performance and qualification compliance are mandatory.
FAQ
What is the breakdown voltage range for SMBJ8.5AHE3/5B?
The SMBJ8.5AHE3/5B has a guaranteed breakdown voltage (VBR) range of 9.44 V to 10.4 V at 1 mA test current, measured per ANSI/IEEE C62.35. This tight window ensures consistent clamping behavior across production lots and supports reliable design margining for protected circuits.
Is SMBJ8.5AHE3/5B suitable for automotive applications?
Yes, SMBJ8.5AHE3/5B is AEC-Q101 qualified and manufactured with automotive-grade process controls. Its –55 °C to +150 °C operating junction temperature range, MSL Level 1 rating, and UL 497B recognition make it appropriate for engine control, body electronics, and ADAS power rail protection where certified reliability is required.
What is the maximum clamping voltage of SMBJ8.5AHE3/5B under surge conditions?
The SMBJ8.5AHE3/5B clamps to a maximum of 14.4 V when subjected to its rated peak pulse current of 41.7 A (10/1000 μs waveform). This VC value is measured at the device terminals and represents the highest voltage imposed on downstream components during worst-case transient events.
How does SMBJ8.5AHE3/5B differ from SMBJ8.5A-E3/5B?
The SMBJ8.5AHE3/5B differs from SMBJ8.5A-E3/5B solely in qualification status: HE3 denotes AEC-Q101 qualification and enhanced traceability, while E3 is commercial-grade only. All electrical parameters, package dimensions, and thermal characteristics are identical between the two part numbers.
What is the thermal resistance of SMBJ8.5AHE3/5B, and how does it affect layout?
SMBJ8.5AHE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This value guides PCB copper area allocation - reducing pad size increases thermal resistance and requires derating of pulse power capability above 25 °C ambient.
SMBJ8.5AHE3/5B 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 41.7A
- 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)
SMBJ8.5AHE3/5B FAQ
1.How can I place an order for SMBJ8.5AHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5AHE3/5B 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 SMBJ8.5AHE3/5B reliable?
The price and inventory of SMBJ8.5AHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ8.5AHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ8.5AHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5AHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5AHE3/5B?
SMBJ8.5AHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5AHE3/5B 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 SMBJ8.5AHE3/5B?
For technical support, including SMBJ8.5AHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5AHE3/5B requirements.
6.How does Aetrix verify that SMBJ8.5AHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5AHE3/5B 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 SMBJ8.5AHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ8.5AHE3/5B?
All SMBJ8.5AHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5AHE3/5B, 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 SMBJ8.5AHE3/5B part is unused and in its original packaging.
Return procedure for SMBJ8.5AHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5AHE3/5B Tags
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