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Vishay General Semiconductor - Diodes Division SMBJ8.5A-M3/52
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- Part No.:
- SMBJ8.5A-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5A-M3/52.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,407
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Product details
Overview
SMBJ8.5A-M3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary-level overvoltage protection of DC power rails 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 clamping voltage (VC) at 41.7 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial sensor interfaces, automotive body control modules, and USB power input stages.
For engineers reviewing the SMBJ8.5A-M3/52 datasheet, SMBJ8.5A-M3/52 pinout, SMBJ8.5A-M3/52 application, or SMBJ8.5A-M3/52 equivalent, key selection criteria include its unidirectional polarity, SMB (DO-214AA) package compatibility with automated SMT placement, low 1.0 µA max reverse leakage at VWM, AEC-Q101 qualification eligibility via HM3 suffix variants, and thermal resistance of 100 °C/W (junction-to-ambient).
Technical Context
This TVS diode operates as a clamping device that remains non-conductive below VWM = 8.5 V and rapidly transitions to low-impedance conduction when transients exceed VBR (min 9.44 V). Its glass-passivated junction ensures stable avalanche characteristics and repeatable surge response under repetitive 10/1000 µs pulses at 0.01% duty cycle.
The SMBJ8.5A-M3/52 exhibits a temperature coefficient of VBR of +0.073 %/°C and is rated for operation from –55 °C to +150 °C junction temperature. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards, and the halogen-free, RoHS-compliant M3 suffix confirms compliance with JESD 201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 8.5 V - Maximum continuous reverse operating voltage before significant leakage; sets threshold for normal circuit operation. |
| VBR (Breakdown Voltage) | 9.44–10.4 V at IT = 1 mA - Confirmed avalanche onset range; defines minimum transient level triggering clamping action. |
| VC (Clamping Voltage) | 14.4 V at IPPM = 41.7 A - Maximum voltage seen by protected circuit during 600 W surge; determines downstream IC survivability. |
| IPPM (Peak Pulse Current) | 41.7 A with 10/1000 µs waveform - Peak surge current capability; validates protection against IEC 61000-4-5 Level 3/4 surges. |
| PPPM (Peak Pulse Power) | 600 W - Transient energy handling capacity; enables robust protection without thermal runaway under short-duration events. |
| ID (Max Reverse Leakage) | 1.0 µA at VWM - Minimal standby power loss and signal integrity impact on sensitive analog or low-power circuits. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs board layout cooling requirements. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, with cathode band marking on the case. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); terminals are matte tin-plated for reliable reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes clamping path during positive transients on cathode side. |
| Cathode | Protected line connection | Connected to the line being protected (e.g., 12 V rail or USB VBUS); conducts surge current to anode during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against high-energy transients per IEC 61000-4-5, eliminating need for cascaded protection stages. |
| 14.4 V clamping at 41.7 A | Ensures downstream 12 V-rated ICs (e.g., CAN transceivers, microcontrollers) remain within absolute maximum ratings during surge events. |
| Low 1.0 µA reverse leakage at 8.5 V | Minimizes quiescent current draw in battery-powered systems and avoids false triggering in precision voltage monitoring circuits. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without moisture-related popcorning, enabling direct integration into high-volume SMT lines. |
| AEC-Q101 qualification path (HM3 suffix) | Provides documented reliability pathway for automotive applications including body electronics and infotainment power inputs. |
Applications
| Automotive Body Control Module (BCM) Power Input | Industrial RS-485 Transceiver Protection |
|---|---|
Use Scenario: Protects 12 V supply rail of BCM against load dump and ISO 7637-2 pulse 5a transients. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between VBAT and GND, activated within <1 ns of overvoltage onset. Use Value: Limits clamped voltage to 14.4 V, ensuring MCU and driver ICs survive 35 V/100 ms load dump events without derating. |
Use Scenario: Shields RS-485 transceiver data lines (A/B) from ESD and cable-induced surges in factory automation networks. IC Role / Device Role / Timing Role: Paired unidirectional TVS devices on each differential line, referenced to local ground plane. Use Value: Maintains signal integrity with <2.2 pF typical junction capacitance at zero bias, avoiding data rate degradation up to 20 Mbps. |
| USB Type-A Port VBUS Protection | Smart Meter AC/DC Power Supply Input |
Use Scenario: Guards 5 V VBUS line against hot-plug transients and ESD per IEC 61000-4-2 Level 4 (±15 kV air). IC Role / Device Role / Timing Role: Primary clamping device located immediately after USB connector, upstream of polyfuse and LDO. Use Value: Achieves sub-1 ns response time and 14.4 V clamping, preventing latch-up or gate oxide damage in USB controller ICs. |
Use Scenario: Suppresses switching surges from relay coils and transformer inrush on 24 V DC auxiliary supply in utility meters. IC Role / Device Role / Timing Role: Front-end TVS on rectified DC bus, coordinated with MOV and filter capacitors for staged energy absorption. Use Value: Handles 600 W peak pulses without degradation across 100,000+ surge cycles, supporting 15-year field lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.0A-M3/52 | Lower VWM = 8.0 V; VC = 13.6 V at 44.1 A | Better suited for 5 V–8 V logic rails where tighter clamping margin is required | Select when system operating voltage is ≤8.0 V and lower clamping voltage is prioritized over margin to VBR. |
| SMBJ9.0A-M3/52 | Higher VWM = 9.0 V; VC = 15.4 V at 39.0 A | Preferred for 9–12 V systems needing higher standoff to avoid leakage-induced power loss | Choose for 12 V automotive or industrial rails where 8.5 V VWM risks marginal conduction near nominal voltage. |
Compared with SMBJ8.0A-M3/52 and SMBJ9.0A-M3/52, the SMBJ8.5A-M3/52 provides optimal balance for 9–10 V nominal systems - offering 0.5 V higher standoff than the 8.0 V variant while maintaining 1.0 V lower clamping than the 9.0 V part, directly improving protection margin for 12 V tolerant ICs.
Availability
SMBJ8.5A-M3/52 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body electronics, and USB power input protection requiring stable component supply and long-term manufacturing continuity.
Supply support for SMBJ8.5A-M3/52 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 for robust transient suppression in automotive, industrial, and communications infrastructure - delivering consistent clamping behavior and AEC-Q101 qualification readiness.
FAQ
What is the clamping voltage of SMBJ8.5A-M3/52 under maximum surge conditions?
The SMBJ8.5A-M3/52 has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current of 41.7 A with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that protected circuitry downstream will not experience voltages exceeding 14.4 V during standardized surge events - a critical parameter for ensuring compatibility with 12 V logic and power ICs. The SMBJ8.5A-M3/52 maintains this clamping performance across its full operating temperature range.
Is SMBJ8.5A-M3/52 suitable for automotive applications?
The SMBJ8.5A-M3/52 itself is commercial-grade (M3 suffix), but it belongs to the AEC-Q101-qualified SMBJ family - with automotive variants designated by HM3 suffix (e.g., SMBJ8.5AHM3_B/H). Its construction - glass-passivated junction, MSL Level 1 rating, and –55 °C to +150 °C operating range - meets foundational automotive reliability requirements. For production automotive use, specify the HM3 version; the SMBJ8.5A-M3/52 serves as a drop-in-compatible commercial alternative for prototyping and non-safety-critical subsystems. The SMBJ8.5A-M3/52 shares identical electrical specs and package dimensions with its HM3 counterpart.
How does the SMBJ8.5A-M3/52 differ from bidirectional TVS diodes like SMBJ8.5CA?
The SMBJ8.5A-M3/52 is unidirectional and functions only during positive transients on its cathode terminal relative to anode - behaving like a Zener in reverse and an ordinary diode in forward bias. In contrast, SMBJ8.5CA is bidirectional and clamps symmetrically for both polarities, making it suitable for AC lines or differential data paths. The SMBJ8.5A-M3/52 offers lower leakage (<1.0 µA vs. up to 2.0 µA for CA types at same VWM) and is preferred for DC rail protection where polarity is fixed. Its cathode band marking clearly identifies orientation, unlike the unmarked SMBJ8.5CA.
What is the thermal resistance and power derating behavior of SMBJ8.5A-M3/52?
The SMBJ8.5A-M3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per JEDEC standards. Its 5.0 W steady-state power dissipation (PD) is derated linearly above 25 °C ambient, reaching zero at 150 °C junction temperature. For example, at 75 °C ambient, allowable PD drops to 2.5 W. This derating curve (Fig. 2 in datasheet 88392) must be applied when estimating long-term reliability under sustained leakage or frequent surge repetition. The SMBJ8.5A-M3/52's RθJL of 20 °C/W further supports localized heat sinking via PCB copper pours.
Can SMBJ8.5A-M3/52 be used in parallel for higher surge current handling?
No - SMBJ8.5A-M3/52 should not be paralleled for increased IPPM. Due to inherent VBR tolerances (±5.5% min–max spread: 9.44–10.4 V), forced current sharing is not guaranteed, leading to uneven stress and premature failure of the lower-VBR unit. Vishay specifies single-device operation only. For higher surge capability, select a higher-rated part (e.g., SMBJ12A) or use a TVS array with matched characteristics. The SMBJ8.5A-M3/52's 600 W rating is validated per individual device testing and must not be extrapolated across multiple units.
SMBJ8.5A-M3/52 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:
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ8.5A-M3/52 FAQ
1.How can I place an order for SMBJ8.5A-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5A-M3/52 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 SMBJ8.5A-M3/52 reliable?
The price and inventory of SMBJ8.5A-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ8.5A-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ8.5A-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5A-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5A-M3/52?
SMBJ8.5A-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5A-M3/52 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 SMBJ8.5A-M3/52?
For technical support, including SMBJ8.5A-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5A-M3/52 requirements.
6.How does Aetrix verify that SMBJ8.5A-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5A-M3/52 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 SMBJ8.5A-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ8.5A-M3/52?
All SMBJ8.5A-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5A-M3/52, 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 SMBJ8.5A-M3/52 part is unused and in its original packaging.
Return procedure for SMBJ8.5A-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5A-M3/52 Tags
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