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Vishay General Semiconductor - Diodes Division SMB8J28CAHE3_A/H
- Part No.:
- SMB8J28CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J28CAHE3_A/H.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,464
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Product details
Overview
SMB8J28CAHE3_A/H 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 SMB8J28CAHE3_A/H datasheet, SMB8J28CAHE3_A/H pinout, SMB8J28CAHE3_A/H application, or SMB8J28CAHE3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VWM ≈ 1.62), and compatibility with automated SMT assembly on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector, responding within <1 ps to transients induced by inductive switching or ESD events. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1 µA at VWM), while the bidirectional symmetry enables symmetric surge suppression on AC-coupled or differential lines without polarity constraints.
Thermal performance is defined by RθJA = 72 °C/W and RθJL = 20 °C/W, supporting operation up to TJ = +150 °C. The SMB package meets UL 94 V-0 and J-STD-020 MSL Level 1 (260 °C peak reflow), with matte tin-plated leads compliant to J-STD-002 and JESD22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before clamping initiates; sets upper limit for normal signal swing in protected circuit |
| VBR (min/max) | 31.1 V / 34.4 V at IT = 1 mA - defines tight 10.6% tolerance window for predictable turn-on threshold under surge conditions |
| VC @ IPPM | 45.4 V at 17.6 A (10/1000 µs) - clamping voltage determines worst-case overvoltage seen by downstream ICs during surge |
| PPPM | 800 W - peak transient energy absorption capacity; validates suitability for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 |
| ID @ VWM | ≤1.0 µA - ultra-low leakage preserves signal integrity and battery life in always-on sensor nodes |
| TJ max. | +150 °C - enables deployment in under-hood automotive environments and industrial enclosures without derating |
| AEC-Q101 | Qualified - certified for automotive-grade reliability including temperature cycling, HTRB, and ESD per AEC standard |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical dual-terminal construction with cathode band omitted per bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (1) | Surge current path terminal | Either terminal conducts during positive or negative transients; bidirectional symmetry eliminates orientation constraints during placement |
| Anode/Cathode (2) | Surge current path terminal | Completes low-impedance shunt path to ground or rail; requires symmetric PCB pad layout (0.2" × 0.2" copper per terminal) for rated PPPM |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., CAN, RS-485), and floating power rails without external polarity management |
| AEC-Q101 qualification | Validates long-term reliability in automotive applications including engine control units, ADAS sensors, and body electronics modules |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes overvoltage stress on protected ICs - critical for 3.3 V/5 V logic interfacing with 28 V supply domains |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT processes without moisture sensitivity concerns or baking requirements |
| Glass-passivated junction | Ensures stable VBR across temperature and lifetime, with reduced parameter drift versus epoxy-passivated alternatives |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) in engine bay modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role: Bidirectional shunt clamp placed between signal line and chassis ground to divert surge energy away from precision amplifier inputs. Use Value: Maintains signal fidelity under 800 W transients while meeting AEC-Q101 requirements for 15-year vehicle service life. |
Use Scenario: Safeguarding PLC digital input channels connected to 24 V DC field wiring subject to inductive kickback from solenoids and contactors. IC Role / Device Role: Primary overvoltage clamp on each input channel, mounted directly at connector entry point to minimize inductance. Use Value: Limits transient voltage to ≤45.4 V, ensuring compatibility with 30 V-rated input buffers and eliminating need for series impedance. |
| Telecom Line Interface | Consumer Appliance Motor Control |
|
Use Scenario: Protecting RS-485 transceiver pins in outdoor network equipment subjected to lightning-induced surges per IEC 61000-4-5 Level 3 (2 kV/12 Ω). IC Role / Device Role: Bidirectional TVS placed across differential pair (A/B) and to ground, providing common-mode and differential-mode suppression. Use Value: Achieves 800 W surge rating with sub-1 ns response, preserving data integrity during multi-kV transients without signal distortion. |
Use Scenario: Shielding microcontroller GPIOs driving brushed DC motors in smart home appliances where commutation spikes exceed 100 V. IC Role / Device Role: Localized clamp at motor driver output stage to suppress back-EMF spikes before they propagate to logic-level circuitry. Use Value: Clamps 17.6 A surge at 45.4 V, preventing latch-up or gate oxide damage in 3.3 V MCU I/O cells rated for 5.5 V absolute maximum. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28CAHE3_A/H | Same SMB package and VWM (28 V), but lower PPPM (600 W) and higher VC (48.3 V at 13.2 A) | Lower surge margin; suitable only for less severe environments (e.g., consumer vs. automotive) | Select when cost sensitivity outweighs need for full 800 W rating and tighter clamping |
| SMCJ28CAHE3_A/H | Larger SMC (DO-214AB) package; same VWM and VBR, but higher PPPM (1500 W) and lower VC (45.4 V at 33 A) | Requires larger PCB area and higher thermal mass; better for high-reliability industrial systems | Choose when system-level surge threat exceeds 800 W or board layout allows SMC footprint |
Compared with SMBJ28CAHE3_A/H, SMB8J28CAHE3_A/H delivers +33 % peak power handling and −6 % clamping voltage; versus SMCJ28CAHE3_A/H, it trades 44 % smaller footprint for −47 % lower surge capacity - enabling compact, AEC-Q101-compliant protection where space is constrained.
Availability
SMB8J28CAHE3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial digital I/O protection, telecom line interfaces, and consumer appliance motor control requiring stable component supply across production lifecycles.
Supply support for SMB8J28CAHE3_A/H 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 application-specific performance.
The SMB8JxxCAHE3 series belongs to Vishay's AEC-Q101-qualified TRANSZORB® TVS family, engineered for robust transient suppression in harsh automotive and industrial environments where failure is not an option.
FAQ
What is the clamping voltage of SMB8J28CAHE3_A/H at its rated peak pulse current?
The SMB8J28CAHE3_A/H has a maximum clamping voltage (VC) of 45.4 V when subjected to its rated peak pulse current (IPPM) of 17.6 A using the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring compatibility with 30 V-rated interface ICs.
Is SMB8J28CAHE3_A/H suitable for automotive applications?
Yes, SMB8J28CAHE3_A/H is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix indicating RoHS-compliant and AEC-Q101-qualified construction. It meets requirements for temperature cycling, high-temperature reverse bias, and ESD robustness required in engine control, body electronics, and ADAS sensor modules.
How does the bidirectional configuration of SMB8J28CAHE3_A/H affect PCB layout?
The bidirectional nature of SMB8J28CAHE3_A/H eliminates polarity marking - both terminals are functionally identical, allowing unrestricted orientation during automated placement. Layout requires symmetric 0.2" × 0.2" copper pads per terminal to maintain rated 800 W pulse power dissipation and thermal performance per Vishay's recommended mounting pad layout.
What is the maximum operating junction temperature for SMB8J28CAHE3_A/H?
The SMB8J28CAHE3_A/H has a maximum operating junction temperature (TJ max.) of +150 °C, verified per thermal characterization in the datasheet. This rating supports reliable operation in under-hood automotive locations and sealed industrial enclosures, provided PCB thermal design maintains RθJA ≤ 72 °C/W under worst-case ambient conditions.
Does SMB8J28CAHE3_A/H meet industry standards for surge immunity testing?
Yes, SMB8J28CAHE3_A/H is rated for 800 W peak pulse power with a 10/1000 µs waveform, aligning with IEC 61000-4-5 Level 3 (2 kV line-to-ground, 12 Ω source impedance) and ISO 7637-2 Pulse 1/2a/5a test profiles. Its 45.4 V clamping voltage ensures protected circuits remain within safe operating limits during standardized surge events.
SMB8J28CAHE3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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_A/H FAQ
1.How can I place an order for SMB8J28CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J28CAHE3_A/H 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_A/H reliable?
The price and inventory of SMB8J28CAHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J28CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMB8J28CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J28CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J28CAHE3_A/H?
SMB8J28CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J28CAHE3_A/H 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_A/H?
For technical support, including SMB8J28CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J28CAHE3_A/H requirements.
6.How does Aetrix verify that SMB8J28CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMB8J28CAHE3_A/H 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_A/H meets industry standards.
7.What is the process for return or replacement of SMB8J28CAHE3_A/H?
All SMB8J28CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J28CAHE3_A/H, 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_A/H part is unused and in its original packaging.
Return procedure for SMB8J28CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J28CAHE3_A/H Tags
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