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Vishay General Semiconductor - Diodes Division SMB8J28CA-M3/52
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- Part No.:
- SMB8J28CA-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J28CA-M3/52.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,304
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Product details
Overview
SMB8J28CA-M3/52 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on signal and power lines. It features a 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR), 45.4 V clamping voltage (VC) at 17.6 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J28CA-M3/52 datasheet, SMB8J28CA-M3/52 pinout, SMB8J28CA-M3/52 application, or SMB8J28CA-M3/52 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance (M3 suffix), and thermal resistance (RθJA = 72 °C/W) for PCB-level thermal design validation.
Technical Context
This device operates as a voltage-clamped crowbar during transients, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity constraints.
Rated for -55 °C to +150 °C junction temperature, it meets MSL Level 1 per J-STD-020 (260 °C peak reflow), and its 0.2" × 0.2" copper pad layout requirement directly impacts derated IPPM above 25 °C ambient - validated per Figure 2 in Document 88422.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before clamping initiates; defines safe signal swing margin in protected circuit. |
| VBR min/max | 31.1 V / 34.4 V at 1 mA - guaranteed breakdown threshold range; ensures consistent turn-on across production lots. |
| VC @ IPPM | 45.4 V at 17.6 A - clamped voltage seen by downstream ICs during 10/1000 µs surge; determines maximum stress on protected load. |
| PPPM | 800 W - peak transient energy absorption capacity; defines survivability against ISO 7637-2 Pulse 1/2/5a or IEC 61000-4-5 surges. |
| ID @ VWM | 1.0 µA - reverse leakage at stand-off voltage; critical for low-power sensor bias networks and battery-backed circuits. |
| RθJA | 72 °C/W - junction-to-ambient thermal resistance; used to calculate ΔT rise under sustained surge duty cycles or elevated ambient. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including HTOL, TCT, ESD, and mechanical shock; required for engine control, ADAS, and body electronics. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical terminals accept either orientation in PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; clamps voltage between them when |Vdiff| exceeds VBR - enables placement across any two nodes requiring bidirectional overvoltage suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC, differential, or floating signal lines (e.g., CAN, RS-485, audio) without polarity-sensitive routing. |
| AEC-Q101 qualification | Validated for automotive underhood and cabin applications - eliminates need for additional qualification testing in Tier 1 BOMs. |
| Halogen-free & RoHS-compliant (M3) | Meets EU Directive 2011/65/EU and JEDEC J-STD-201 Class 2 whisker resistance - supports green manufacturing and export compliance. |
| Low profile SMB package | Height ≤ 0.096" (2.44 mm) - fits space-constrained modules like radar sensors and compact ECUs while enabling automated pick-and-place. |
| MSL Level 1 rating | Compatible with standard SMT reflow profiles up to 260 °C peak - no pre-baking required, reducing assembly cost and process complexity. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and pressure/temperature sensor outputs from load dump and inductive switching spikes in 12 V vehicle systems. IC Role / Device Role: Bidirectional voltage clamp placed across sensor output and ground (or supply rail) to limit transient excursions. Use Value: Prevents latch-up or gate oxide damage in ASICs with 30 V absolute max ratings by clamping surges to ≤45.4 V at 17.6 A. |
Use Scenario: Safeguarding PLC digital input channels connected to 24 V DC field wiring exposed to relay coil flyback and ESD events. IC Role / Device Role: Primary surge shunt mounted at connector entry point, upstream of optocoupler or Schmitt trigger input stage. Use Value: Absorbs 800 W pulses without degradation, maintaining <1 µA leakage to preserve input hysteresis thresholds and reduce false triggering. |
| Automotive Body Control Module | Consumer Appliance Motor Drive |
Use Scenario: Shielding microcontroller GPIOs driving LED clusters and small solenoids in door modules subject to battery reversal and jump-start transients. IC Role / Device Role: Bidirectional TVS placed between MCU pin and external load to suppress both positive and negative-going spikes. Use Value: Enables direct connection without series resistors or diode steering networks - reduces BOM count and board area in space-limited modules. |
Use Scenario: Protecting H-bridge gate drivers in washing machine motor controllers from back-EMF spikes during commutation. IC Role / Device Role: Clamp across half-bridge leg (high-side source to low-side drain) to suppress shoot-through-inducing voltage overshoot. Use Value: Limits voltage excursion to 45.4 V, preventing unintended MOSFET turn-on and ensuring robust operation under 100 kHz PWM switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J28CA-E3/52 | Same electrical specs, but RoHS-compliant commercial grade (E3) without halogen-free certification; RθJA identical. | Lacks halogen-free compliance; acceptable for non-automotive industrial use where JEDEC J-STD-201 Class 2 whisker resistance not mandated. | Select SMB8J28CA-E3/52 only if halogen-free material content is not required by end-equipment environmental policy. |
| SMBJ28CA-M3/52 | Same VWM/VBR/VC ratings, but lower PPPM (600 W vs. 800 W); identical SMB package and AEC-Q101 qualification. | Lower surge energy handling limits suitability to less severe environments (e.g., interior infotainment vs. engine bay). | Choose SMBJ28CA-M3/52 only when system-level surge testing confirms 600 W suffices - avoids over-spec'ing cost and footprint. |
Compared with SMB8J28CA-M3/52, the E3 variant trades halogen-free compliance for broader commercial availability, while the SMBJ28CA-M3/52 offers identical automotive qualification at reduced surge capacity - enabling tiered BOM strategies across product families.
Availability
SMB8J28CA-M3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial digital I/O protection, and body control module designs requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMB8J28CA-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, rectifiers, and protection devices with emphasis on reliability, power density, and automotive qualification.
The SMB8JxxCA series targets high-reliability transient suppression in automotive and industrial environments, engineered specifically to meet AEC-Q101 and ISO 16750 requirements while maintaining low-profile surface-mount compatibility.
FAQ
What is the clamping voltage of SMB8J28CA-M3/52 and how is it measured?
The SMB8J28CA-M3/52 has a maximum clamping voltage (VC) of 45.4 V, measured at 17.6 A peak pulse current (IPPM) using a 10/1000 µs double-exponential waveform per ANSI/IEEE C62.35. This value represents the highest voltage imposed on protected circuitry during a standardized surge event - critical for verifying compatibility with downstream IC absolute maximum ratings. The SMB8J28CA-M3/52 achieves this clamping performance consistently across its qualified temperature range (-55 °C to +150 °C).
Is SMB8J28CA-M3/52 suitable for automotive applications?
Yes, SMB8J28CA-M3/52 is AEC-Q101 qualified and explicitly rated for automotive use, including underhood and cabin environments. Its halogen-free (M3) construction, MSL Level 1 reflow compatibility, and validated performance across -55 °C to +150 °C junction temperature make it appropriate for engine control units, ADAS sensors, and body electronics. The SMB8J28CA-M3/52 meets ISO 7637-2 and IEC 61000-4-5 surge immunity requirements when applied per Vishay's recommended pad layout.
How does the bidirectional configuration of SMB8J28CA-M3/52 affect PCB layout?
The SMB8J28CA-M3/52 has no polarity marking and functions identically in either orientation, simplifying PCB layout for differential or AC-coupled signals. Engineers can place it across any two nodes requiring symmetric overvoltage protection - such as CAN_H/CAN_L, RS-485 A/B, or speaker outputs - without concern for anode/cathode alignment. This eliminates routing constraints and reduces design review iterations. The SMB8J28CA-M3/52's symmetrical terminals also allow reuse in both unidirectional and bidirectional topologies via simple netlist updates.
What is the thermal resistance of SMB8J28CA-M3/52 and why does it matter?
The SMB8J28CA-M3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This parameter determines temperature rise during repetitive surge events or elevated ambient conditions - essential for predicting long-term reliability in thermally constrained enclosures. For example, dissipating 100 W for 10 ms raises junction temperature by ~7.2 °C above ambient. Accurate RθJA modeling ensures the SMB8J28CA-M3/52 remains within its 150 °C TJ max limit under worst-case duty cycles.
Does SMB8J28CA-M3/52 require derating at elevated temperatures?
Yes, SMB8J28CA-M3/52 requires derating of peak pulse current (IPPM) and power (PPPM) above TA = 25 °C, per Figure 2 in Vishay Document 88422. At 85 °C ambient, IPPM drops to ~75 % of its 25 °C value (17.6 A → ~13.2 A), and PPPM falls proportionally. This derating reflects increased junction temperature limiting safe energy absorption. Designers must apply this curve during thermal analysis of systems operating in hot environments - such as under-dash automotive modules - to ensure the SMB8J28CA-M3/52 maintains specified clamping performance throughout its operational envelope.
SMB8J28CA-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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 17.6A
- Power - Peak Pulse:
- 800W
- 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)
SMB8J28CA-M3/52 FAQ
1.How can I place an order for SMB8J28CA-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J28CA-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 SMB8J28CA-M3/52 reliable?
The price and inventory of SMB8J28CA-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 SMB8J28CA-M3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J28CA-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J28CA-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J28CA-M3/52?
SMB8J28CA-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J28CA-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 SMB8J28CA-M3/52?
For technical support, including SMB8J28CA-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J28CA-M3/52 requirements.
6.How does Aetrix verify that SMB8J28CA-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J28CA-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 SMB8J28CA-M3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J28CA-M3/52?
All SMB8J28CA-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J28CA-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 SMB8J28CA-M3/52 part is unused and in its original packaging.
Return procedure for SMB8J28CA-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J28CA-M3/52 Tags
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