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Vishay General Semiconductor - Diodes Division SMB8J28CA-E3/52
- Part No.:
- SMB8J28CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J28CA-E3/52.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMB8J28CA-E3/52 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) at 1 mA, 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-E3/52 datasheet, SMB8J28CA-E3/52 pinout, SMB8J28CA-E3/52 application, or SMB8J28CA-E3/52 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VWM ≈ 1.62), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This bidirectional TVS diode operates symmetrically across both polarities, enabling robust protection against ESD, lightning-induced transients, and inductive switching spikes without polarity constraints. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, critical for consistent clamping under repetitive surges.
The device meets ANSI/IEEE C62.35 standards for transient suppression and is rated for -55 °C to +150 °C operating junction temperature. With RθJA = 72 °C/W and RθJL = 20 °C/W, thermal performance supports sustained operation in compact automotive ECUs and industrial controllers when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 24 V nominal systems. |
| VBR min/max | 31.1 V / 34.4 V at IT = 1 mA - tight breakdown window ensures predictable turn-on and minimal overvoltage exposure during transients. |
| VC @ IPPM | 45.4 V at 17.6 A (10/1000 µs) - clamping voltage limits downstream IC stress; VC/VWM ratio of 1.62 indicates high suppression efficiency. |
| PPPM | 800 W - peak pulse power handling capacity determines survivability against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω). |
| ID @ VWM | 1.0 µA - ultra-low leakage preserves signal integrity and battery life in always-on sensor circuits. |
| TJ max | +150 °C - enables deployment in under-hood automotive environments and thermally constrained industrial enclosures. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22-A114. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102; no polarity marking (bidirectional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | Either terminal serves as anode or cathode depending on transient polarity; no color band or marking required. |
| Case (body) | Thermal and mechanical interface | Exposed metal slug provides primary heat dissipation path to PCB copper; requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN FD, RS-485, LIN) without polarity concerns. |
| AEC-Q101 qualification | Validated for automotive applications including engine control modules, ADAS sensors, and body electronics with zero defects target. |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 260 °C peak without baking, simplifying SMT line integration and reducing handling cost. |
| Glass-passivated junction | Ensures long-term parameter stability and resistance to humidity-induced degradation in harsh industrial or outdoor environments. |
| Low clamping ratio (VC/VWM) | 1.62 - minimizes overvoltage overshoot during surge events, protecting 30 V-rated MOSFETs and 3.3 V/5 V logic interfaces downstream. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS clamp limiting transient voltage to ≤45.4 V during 10/1000 µs surges up to 800 W. Use Value: Prevents latch-up or gate oxide damage in downstream op-amps and ADC front-ends while maintaining signal fidelity below 28 V DC bias. |
Use Scenario: Safeguarding PLC digital input channels connected to 24 V DC field wiring subject to inductive kickback from solenoids and relays. IC Role / Device Role / Timing Role: Fast-response (sub-nanosecond) voltage clamp absorbing 17.6 A surge current without degradation over 1000+ events. Use Value: Eliminates need for external series impedance or RC snubbers, reducing BOM count and board space in DIN-rail mounted controllers. |
| Automotive CAN FD Bus | Telecom Line Interface |
|
Use Scenario: Secondary surge protection on CAN FD data lines (CANH/CANL) in gateway ECUs where primary protection resides upstream. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF typical at 0 V) bidirectional clamp preserving signal edge integrity up to 5 Mbps. Use Value: Maintains common-mode noise rejection and differential timing margins while suppressing ±25 kV ESD (IEC 61000-4-2) and 4 kV EFT (IEC 61000-4-4). |
Use Scenario: Protecting Ethernet PHY interface pins (e.g., MDI pairs) in PoE-powered network switches against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Symmetric clamping across differential pair with matched VBR and VC characteristics ensuring balanced transient response. Use Value: Avoids differential skew and common-mode imbalance that could trigger false link loss or packet corruption during surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28CA-E3/52 | Same SMB package and VWM/VBR/VC specs, but rated for 600 W PPPM (vs. 800 W); lower IPPM (13.9 A vs. 17.6 A). | Less suitable for IEC 61000-4-5 Level 4 compliance; adequate for consumer-grade or lower-energy industrial transients. | Select SMBJ28CA-E3/52 only if system-level surge testing confirms <600 W requirement and cost optimization is prioritized. |
| SMCJ28CA-E3/52 | Larger SMC (DO-214AB) package; identical electrical specs but higher PPPM (1500 W), IPPM (33.5 A), and RθJA (40 °C/W). | Better thermal margin and surge headroom, but requires larger PCB footprint and may not fit space-constrained automotive modules. | Choose SMCJ28CA-E3/52 when higher energy absorption is needed and board area allows SMC footprint; not drop-in compatible. |
Compared with SMBJ28CA-E3/52, SMB8J28CA-E3/52 delivers 33% higher surge power handling in the same SMB footprint; versus SMCJ28CA-E3/52, it trades 44% lower thermal resistance for 25% smaller board area - making it optimal for AEC-Q101-compliant, space-limited 24 V system protection.
Availability
SMB8J28CA-E3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial digital I/O protection, CAN FD bus safeguarding, and telecom line interface applications requiring stable component supply, AEC-Q101 traceability, and RoHS-compliant manufacturing.
Supply support for SMB8J28CA-E3/52 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, power density, and automotive qualification.
The SMB8JxxCA series is part of Vishay's TRANSZORB® TVS platform engineered specifically for high-power-density, AEC-Q101-compliant transient suppression in automotive and industrial environments where space, thermal performance, and surge robustness are critical.
FAQ
What is the clamping voltage of SMB8J28CA-E3/52 at its rated peak pulse current?
The SMB8J28CA-E3/52 has a maximum clamping voltage (VC) of 45.4 V when subjected to its specified peak pulse current (IPPM) of 17.6 A using the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and reflects worst-case conduction behavior under surge conditions - a key parameter for verifying downstream component voltage safety margins in designs using SMB8J28CA-E3/52.
Is SMB8J28CA-E3/52 suitable for automotive applications?
Yes, SMB8J28CA-E3/52 is AEC-Q101 qualified and manufactured with RoHS-compliant materials (E3 suffix), making it suitable for automotive applications including engine control units, ADAS sensors, and body electronics. Its -55 °C to +150 °C operating range, MSL Level 1 rating, and validation across temperature cycling, HTRB, and ESD tests confirm compliance with automotive reliability requirements - a core design attribute of SMB8J28CA-E3/52.
How does the bidirectional configuration of SMB8J28CA-E3/52 affect circuit layout?
The bidirectional nature of SMB8J28CA-E3/52 eliminates polarity marking and orientation constraints during PCB placement - either terminal connects freely to the protected line pair. This simplifies layout for differential interfaces like CAN or RS-485 and avoids assembly errors. Unlike unidirectional TVS diodes, SMB8J28CA-E3/52 requires no cathode alignment, and its symmetrical VBR/VC characteristics ensure matched transient response across both signal polarities in the protected path.
What is the thermal resistance of SMB8J28CA-E3/52, and how does it impact power derating?
SMB8J28CA-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W and junction-to-lead (RθJL) of 20 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. These values directly determine safe operating area: at 100 °C ambient, maximum continuous power must be limited to ~6.9 W to maintain TJ ≤ 150 °C - a critical consideration for SMB8J28CA-E3/52 in thermally dense automotive modules.
Can SMB8J28CA-E3/52 replace SMBJ28CA-E3/52 in an existing design?
SMB8J28CA-E3/52 is physically and electrically pin-compatible with SMBJ28CA-E3/52 in the SMB package, sharing identical footprint, polarity marking (none), and VWM/VBR/VC specifications. However, SMB8J28CA-E3/52 offers 33% higher PPPM (800 W vs. 600 W) and IPPM (17.6 A vs. 13.9 A), enabling direct upgrade for enhanced surge immunity without layout changes - provided the PCB copper pad layout matches the 0.2" × 0.2" thermal requirement for SMB8J28CA-E3/52.
SMB8J28CA-E3/52 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 (SMB)
SMB8J28CA-E3/52 FAQ
1.How can I place an order for SMB8J28CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J28CA-E3/52 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-E3/52 reliable?
The price and inventory of SMB8J28CA-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J28CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J28CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J28CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J28CA-E3/52?
SMB8J28CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J28CA-E3/52 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-E3/52?
For technical support, including SMB8J28CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J28CA-E3/52 requirements.
6.How does Aetrix verify that SMB8J28CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J28CA-E3/52 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-E3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J28CA-E3/52?
All SMB8J28CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J28CA-E3/52, 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-E3/52 part is unused and in its original packaging.
Return procedure for SMB8J28CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J28CA-E3/52 Tags
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