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Vishay General Semiconductor - Diodes Division SMBJ8.5AHE3/52
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- Part No.:
- SMBJ8.5AHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5AHE3/52.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMBJ8.5AHE3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. 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, and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor signal lines in industrial and automotive electronics.
For engineers reviewing the SMBJ8.5AHE3/52 datasheet, SMBJ8.5AHE3/52 pinout, SMBJ8.5AHE3/52 application, or SMBJ8.5AHE3/52 equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification (via HE3 suffix), 1.0 µA max reverse leakage at VWM, thermal resistance of 100 °C/W (junction-to-ambient), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a fast-acting shunt clamp during overvoltage events, leveraging an avalanche breakdown mechanism to divert surge current away from protected circuitry. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance, while the unidirectional configuration provides forward conduction path only during reverse transient suppression.
The device is rated for repetitive 600 W pulses (10/1000 µs), derated above 25 °C per Fig. 2, and supports peak forward surge current up to 100 A (8.3 ms half-sine). It meets MSL Level 1 per J-STD-020, with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102, and is RoHS-compliant and AEC-Q101 qualified.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (min/max) | 9.44 V / 10.4 V at IT = 1 mA - Confirmed breakdown threshold range; ensures reliable triggering across process variation. |
| VC @ IPPM | 14.4 V at 41.7 A - Clamped voltage under full-rated 600 W surge; determines maximum stress on downstream components. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; validates protection capability against common lightning/inductive transients. |
| ID @ VWM | 1.0 µA max - Reverse leakage current at stand-off voltage; critical for low-power sensor and battery-backed circuits. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and industrial environments. |
| RθJA | 100 °C/W - Thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs board-level thermal design. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with cathode band marking on unidirectional variants. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); terminals are matte tin-plated for lead-free soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to ground or low-impedance return in unidirectional clamp configuration; completes current loop during transient. |
| Cathode | Protected line connection / Surge input | Connected to line being protected (e.g., 12 V rail or sensor output); avalanche breakdown occurs between cathode and anode when VWM exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive applications including engine control units and body electronics; supports extended temperature and reliability requirements. |
| 600 W peak pulse power (10/1000 µs) | Withstands high-energy transients from load dump or inductive switching without degradation, per ISO 7637-2 Pulse 5a. |
| 14.4 V clamping voltage at 41.7 A | Ensures downstream ICs rated for ≤16 V absolute maximum survive surge events with minimal overvoltage margin. |
| Low 1.0 µA reverse leakage at 8.5 V | Minimizes standby power loss in always-on systems such as automotive telematics and IoT edge sensors. |
| MSL Level 1, 260 °C reflow compatible | Enables single-pass lead-free reflow assembly without moisture sensitivity concerns or baking requirements. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply rails in automotive ECUs from load-dump transients (ISO 7637-2 Pulse 5a) and alternator overshoot. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between battery rail and ground, triggered within <1 ps to clamp surges above 8.5 V. Use Value: Limits rail voltage to ≤14.4 V during 600 W transients, preventing damage to MCU power inputs and CAN transceivers. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors in factory automation PLC modules exposed to EMI and relay switching noise. IC Role / Device Role / Timing Role: Low-leakage (1.0 µA) TVS mounted directly at sensor connector, clamping fast-rising spikes on 0–5 V or 4–20 mA lines. Use Value: Maintains signal integrity by suppressing >1 kV transients while adding <0.5 pF capacitance - no bandwidth degradation. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feeding Protection |
|
Use Scenario: Secondary-side overvoltage protection in USB-C PD adapters and AC/DC wall adapters subjected to surge testing (IEC 61000-4-5). IC Role / Device Role / Timing Role: Unidirectional TVS placed across +VOUT and GND after DC-DC converter, activated only during fault conditions. Use Value: Absorbs 600 W surges without latch-up or parametric shift, preserving adapter certification and enabling compact layout with SMB footprint. |
Use Scenario: Protecting PoE-powered devices (e.g., IP cameras, wireless APs) from induced surges on 48 V DC feeding lines in outdoor deployments. IC Role / Device Role / Timing Role: High-reliability TVS with AEC-Q101 qualification deployed at PD input, rated for continuous 48 V operation and transient clamping. Use Value: Withstands repeated 10/1000 µs surges up to 600 W while maintaining ≤1.0 µA leakage - avoids false resets in always-on network gear. |
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 version; same electrical specs but not AEC-Q101 qualified; RoHS-compliant only. | Lacks automotive qualification; suitable for consumer/industrial designs where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and lifecycle traceability is not required. |
| SMBJ8.5CAHE3/52 | Bidirectional variant; symmetric breakdown (±9.44–10.4 V); same VC = 14.4 V, but dual-polarity clamping. | Required for AC-coupled or differential signal lines (e.g., RS-485, CAN FD) where polarity reversal may occur. | Choose only if bidirectional protection is needed; not a drop-in replacement due to polarity and marking differences. |
Compared with SMBJ8.5AHE3/52, the E3/52 variant offers identical clamping performance at lower qualification cost, while the CAHE3/52 variant adds bidirectional symmetry at the expense of unidirectional optimization - making SMBJ8.5AHE3/52 the preferred choice for grounded DC rail protection in automotive systems.
Availability
SMBJ8.5AHE3/52 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom DC feeding applications requiring stable component supply, AEC-Q101 compliance, and long-term production continuity.
Supply support for SMBJ8.5AHE3/52 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 validation.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure tolerance, surge immunity, and long-term stability are mission-critical.
FAQ
What is the clamping voltage of SMBJ8.5AHE3/52 and how is it measured?
The SMBJ8.5AHE3/52 has a maximum clamping voltage (VC) of 14.4 V, measured at its rated peak pulse current (IPPM) of 41.7 A using a 10/1000 µs waveform. This value reflects the actual voltage seen by protected circuitry during a worst-case transient event and is validated per ANSI/IEEE C62.35 standards. The SMBJ8.5AHE3/52 maintains this clamping performance across its full operating temperature range (−55 °C to +150 °C).
Is SMBJ8.5AHE3/52 suitable for automotive applications?
Yes - the HE3 suffix confirms SMBJ8.5AHE3/52 is AEC-Q101 qualified, meaning it has passed rigorous stress tests for temperature cycling, humidity, mechanical shock, and lifetime reliability required for automotive electronics. It is commonly deployed in engine control units, body control modules, and ADAS sensor interfaces where sustained operation at 150 °C junction temperature and immunity to load-dump transients are mandatory. The SMBJ8.5AHE3/52 meets these requirements without derating.
How does the SMBJ8.5AHE3/52 differ from the SMBJ8.5A-E3/52?
The SMBJ8.5AHE3/52 and SMBJ8.5A-E3/52 share identical electrical parameters (VWM, VBR, VC, PPPM) and package (SMB), but differ in qualification: HE3 denotes AEC-Q101 qualification and RoHS compliance, while E3 indicates commercial-grade RoHS compliance only. The SMBJ8.5AHE3/52 undergoes additional screening for automotive use, including extended temperature life testing and traceable lot control - making it appropriate for safety-critical vehicle systems where the SMBJ8.5A-E3/52 is not approved.
What is the reverse leakage current specification for SMBJ8.5AHE3/52 at its stand-off voltage?
The SMBJ8.5AHE3/52 specifies a maximum reverse leakage current (ID) of 1.0 µA at its 8.5 V stand-off voltage (VWM) and 25 °C ambient temperature. This low leakage ensures minimal power drain in battery-operated or energy-sensitive applications such as automotive telematics and industrial wireless sensors. Leakage remains below 5 µA up to +125 °C, preserving system efficiency across full operating range.
Can SMBJ8.5AHE3/52 be used in bidirectional signal protection?
No - SMBJ8.5AHE3/52 is a unidirectional TVS diode, with polarity marked by a cathode band; it conducts only in reverse breakdown and blocks forward current beyond ~3.5 V. For bidirectional signal lines (e.g., RS-485, CAN, USB D+/D−), the bidirectional variant SMBJ8.5CAHE3/52 must be used instead. Attempting to use SMBJ8.5AHE3/52 on AC-coupled or polarity-agnostic paths risks forward conduction failure or inadequate protection during negative transients.
SMBJ8.5AHE3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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)
SMBJ8.5AHE3/52 FAQ
1.How can I place an order for SMBJ8.5AHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5AHE3/52 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 SMBJ8.5AHE3/52 reliable?
The price and inventory of SMBJ8.5AHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ8.5AHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ8.5AHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5AHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5AHE3/52?
SMBJ8.5AHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5AHE3/52 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 SMBJ8.5AHE3/52?
For technical support, including SMBJ8.5AHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5AHE3/52 requirements.
6.How does Aetrix verify that SMBJ8.5AHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5AHE3/52 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 SMBJ8.5AHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ8.5AHE3/52?
All SMBJ8.5AHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5AHE3/52, 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 SMBJ8.5AHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ8.5AHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5AHE3/52 Tags
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