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Vishay General Semiconductor - Diodes Division SMB8J28CAHE3/5B
- Part No.:
- SMB8J28CAHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J28CAHE3/5B.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,935
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Product details
Overview
SMB8J28CAHE3/5B 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 SMB8J28CAHE3/5B datasheet, SMB8J28CAHE3/5B pinout, SMB8J28CAHE3/5B application, or SMB8J28CAHE3/5B equivalent, key selection criteria include AEC-Q101 qualification, bidirectional clamping symmetry, low leakage (<1.0 μA at VWM), thermal resistance (RθJA = 72 °C/W), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ), but triggers into low-impedance conduction when transient voltage exceeds VBR, diverting surge current away from downstream ICs. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surges.
Designed per ANSI/IEEE C62.35 standards, SMB8J28CAHE3/5B delivers symmetrical clamping in both polarities, supports operation from −55 °C to +150 °C, and meets J-STD-020 MSL Level 1 (260 °C peak reflow), making it suitable for automotive-grade assembly and harsh-environment deployments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before clamping begins; defines safe signal swing range for protected line. |
| VBR min/max | 31.1 V / 34.4 V at 1.0 mA test current - guaranteed breakdown threshold window ensuring consistent turn-on across production lots. |
| VC @ IPPM | 45.4 V at 17.6 A - clamping voltage during 10/1000 μs surge; limits stress on downstream MOSFETs or microcontrollers. |
| PPPM | 800 W - peak pulse power handling capability; enables robust protection against IEC 61000-4-5 Level 3/4 surges. |
| ID @ VWM | <1.0 μA - ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in battery-powered systems. |
| TJ max | +150 °C - extended junction temperature rating supports under-hood automotive and industrial control cabinet use. |
| AEC-Q101 | Qualified - validated for automotive electronics per stress-test requirements including HTOL, TCT, and ESD HBM/MM. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking; matte tin-plated leads, RoHS-compliant and halogen-free (HE3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Both terminals function identically; bidirectional clamping allows placement without orientation concern on PCB. |
| Cathode band (absent) | Polarity indicator | Not present - confirms bidirectional construction; eliminates risk of incorrect orientation during assembly. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS sensor interfaces. |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles without pre-baking or special handling. |
| Glass-passivated junction | Ensures stable VBR over time and temperature, reducing parameter drift in long-life industrial deployments. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients (e.g., ISO 7637-2 pulse 1/2a), improving system immunity. |
| UL 94 V-0 molding compound | Self-extinguishing encapsulation meets fire-safety requirements for enclosed industrial and transportation equipment. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt TVS diode placed directly at connector entry point to clamp surges before reaching signal conditioning circuitry. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V interface ICs while maintaining <1.0 μA leakage to avoid signal offset errors. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to relay coil flyback and motor drive noise in factory automation. IC Role / Device Role / Timing Role: Bidirectional clamping element on 24 V DC input lines, absorbing repetitive 500 W surges per IEC 61000-4-4. Use Value: Enables >100,000 surge cycles without degradation due to glass-passivated junction and 150 °C TJ rating. |
| Telecom Line Interface | Consumer Power Adapter ESD Protection |
Use Scenario: Shielding Ethernet PHY front-end and PoE detection circuitry from lightning-induced surges on RJ45 ports in network switches. IC Role / Device Role / Timing Role: Primary-level TVS on differential pairs, coordinated with secondary GDT or polymer PTC for staged protection. Use Value: 45.4 V clamping ensures compliance with IEEE 802.3af/bt surge immunity thresholds without compromising data integrity. |
Use Scenario: Protecting USB-C and barrel jack inputs in wall adapters against user-handling ESD (±15 kV air, ±8 kV contact) and AC line transients. IC Role / Device Role / Timing Role: Fast-response shunt device placed between input rectifier output and primary-side controller supply rail. Use Value: Sub-1 ns response time and 800 W PPPM prevent brownout or reset events during repeated ESD events in consumer environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28CAHE3/5B | Same VWM/VBR/VC specs, but rated for 600 W PPPM (vs. 800 W); lower IPPM (13.7 A vs. 17.6 A). | Less robust for high-energy IEC 61000-4-5 surges; suitable only where peak threat energy is ≤600 W. | Select SMB8J28CAHE3/5B when full 800 W surge margin is required for automotive or industrial field deployment. |
| SMCJ28CAHE3/5B | Same electrical specs but in larger SMC (DO-214AB) package; higher thermal mass, RθJA = 35 °C/W (vs. 72 °C/W). | Better sustained power dissipation but requires 30% more board area; not drop-in compatible with SMB footprint. | Choose SMB8J28CAHE3/5B for space-constrained designs where SMB footprint and AEC-Q101 compliance are mandatory. |
Compared with SMBJ28CAHE3/5B and SMCJ28CAHE3/5B, SMB8J28CAHE3/5B uniquely balances 800 W surge capacity, AEC-Q101 qualification, and SMB footprint - enabling automotive-grade protection without layout redesign or thermal derating penalties.
Availability
SMB8J28CAHE3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer power adapter designs requiring stable component supply and long-term lifecycle support.
Supply support for SMB8J28CAHE3/5B 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive qualification.
The SMB8J 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 margin are critical.
FAQ
What is the clamping voltage of SMB8J28CAHE3/5B at its rated peak pulse current?
The SMB8J28CAHE3/5B has a maximum clamping voltage (VC) of 45.4 V at 17.6 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value ensures downstream 3.3 V or 5 V ICs remain within absolute maximum ratings during surge events. The SMB8J28CAHE3/5B achieves this with low incremental surge resistance and symmetric bidirectional behavior.
Is SMB8J28CAHE3/5B suitable for automotive applications?
Yes, SMB8J28CAHE3/5B is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials (HE3 suffix). It supports operating temperatures from −55 °C to +150 °C and passes HTOL, temperature cycling, and ESD testing per automotive requirements. The SMB8J28CAHE3/5B is explicitly recommended for ECU sensor interfaces and infotainment power rails.
What does the "HE3/5B" suffix mean in SMB8J28CAHE3/5B?
The "HE3" denotes RoHS-compliant, AEC-Q101-qualified version with matte tin plating; "5B" specifies packaging in 13-inch plastic tape and reel with 3200 units per reel. This differs from "52" (7-inch reel, 750 units) and "H/I" variants. The SMB8J28CAHE3/5B ordering code ensures traceable, automotive-grade supply chain compliance.
How does SMB8J28CAHE3/5B differ from unidirectional SMB10J28AHE3/5B?
SMB8J28CAHE3/5B is bidirectional with symmetrical clamping in both polarities and 800 W PPPM, while SMB10J28AHE3/5B is unidirectional, rated for 1000 W PPPM and 100 A IFSM. The SMB8J28CAHE3/5B lacks cathode band marking and supports AC-coupled or floating-line protection, unlike the polarity-sensitive SMB10J28AHE3/5B used in DC power rail clamping.
What is the thermal resistance of SMB8J28CAHE3/5B, and how does it affect layout?
SMB8J28CAHE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. To maintain safe operation under repeated surges, PCB layout must follow Vishay's recommended pad dimensions (min. 0.060" × 0.086") - undersized pads increase thermal impedance and risk premature failure. The SMB8J28CAHE3/5B's RθJA value directly determines allowable surge duty cycle in thermally constrained enclosures.
SMB8J28CAHE3/5B 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:
- -
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J28CAHE3/5B FAQ
1.How can I place an order for SMB8J28CAHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J28CAHE3/5B 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 SMB8J28CAHE3/5B reliable?
The price and inventory of SMB8J28CAHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J28CAHE3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J28CAHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J28CAHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J28CAHE3/5B?
SMB8J28CAHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J28CAHE3/5B 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 SMB8J28CAHE3/5B?
For technical support, including SMB8J28CAHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J28CAHE3/5B requirements.
6.How does Aetrix verify that SMB8J28CAHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J28CAHE3/5B 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 SMB8J28CAHE3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J28CAHE3/5B?
All SMB8J28CAHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J28CAHE3/5B, 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 SMB8J28CAHE3/5B part is unused and in its original packaging.
Return procedure for SMB8J28CAHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J28CAHE3/5B Tags
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