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Vishay General Semiconductor - Diodes Division SMBJ28CAHM3_A/I
- Part No.:
- SMBJ28CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28CAHM3_A/I.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,086
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Product details
Overview
SMBJ28CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 45.4 V maximum clamping voltage (VC) at 13.2 A peak pulse current, and 600 W peak pulse power capability with a 10/1000 µs waveform - deployed on signal lines of industrial sensor units and power supply rails.
For engineers reviewing the SMBJ28CAHM3_A/I datasheet, SMBJ28CAHM3_A/I pinout, SMBJ28CAHM3_A/I application, or SMBJ28CAHM3_A/I equivalent, this device serves as a halogen-free, RoHS-compliant, AEC-Q101 qualified TVS for bidirectional surge suppression in automotive and industrial environments where low incremental surge resistance, fast response time (<1 ns), and stable clamping under repetitive transients are critical selection criteria.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical electrical characteristics in forward and reverse directions. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at VWM), while the SMB package supports automated placement and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
The device is rated for -55 °C to +150 °C operating junction temperature and exhibits a typical thermal resistance of 100 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. Its 0.098 %/°C temperature coefficient of VBR enables predictable voltage drift over temperature in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse stand-off voltage before significant conduction begins; defines safe operating margin below clamping threshold |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - verified breakdown range ensuring reliable triggering during ESD or lightning-induced transients |
| VC @ IPPM | 45.4 V at 13.2 A - clamping voltage limits downstream IC stress during 600 W 10/1000 µs surge events |
| PPPM | 600 W - peak pulse power rating confirming suitability for IEC 61000-4-5 Level 3/4 surge immunity compliance |
| IPPM | 13.2 A - peak pulse current capacity derived from 10/1000 µs waveform; determines minimum PCB trace width and layout robustness |
| TJ max. | +150 °C - maximum junction temperature enabling operation in under-hood automotive or high-ambient industrial settings |
| Package | SMB (DO-214AA) - standardized 2-pin surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height for space-constrained designs |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration with no polarity marking; symmetrical terminals suitable for AC-coupled or floating signal line protection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (either polarity) | Accepts surge current during positive or negative voltage excursions; connects to protected line without polarity constraint |
| Cathode | Transient current exit point (either polarity) | Completes low-impedance path to ground or reference rail during clamping; bidirectional symmetry eliminates orientation dependency |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), or ungrounded power rails without polarity concerns |
| 600 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 surge testing up to 1 kV open-circuit / 500 A short-circuit with margin |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control modules, body electronics, and ADAS sensor interfaces |
| Halogen-free & RoHS-compliant | Fulfills environmental compliance requirements for EU, China RoHS, and automotive OEM material declarations |
| MSL Level 1 (260 °C peak) | Permits standard lead-free reflow assembly without moisture sensitivity handling or baking protocols |
Applications
| Industrial Sensor Interface Protection | Automotive CAN Bus Transient Suppression |
|---|---|
|
Use Scenario: Protecting 24 V analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching transients in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional TVS placed between signal line and chassis ground to clamp ±100 V surges within nanoseconds. Use Value: Limits voltage seen by downstream op-amps and ADCs to ≤45.4 V, preventing latch-up and extending system uptime in dusty, high-vibration environments. |
Use Scenario: Safeguarding CAN_H/CAN_L differential pair in automotive body control modules against battery disconnect spikes and ESD events. IC Role / Device Role / Timing Role: Two SMBJ28CAHM3_A/I devices configured in back-to-back arrangement across CAN bus lines to absorb common-mode transients. Use Value: Maintains CAN signal integrity by clamping surges before they exceed ISO 11898-2 fault thresholds, avoiding communication errors during vehicle start-stop cycles. |
| Telecom Power Supply Input Stage | Consumer USB Port ESD Protection |
|
Use Scenario: Secondary-side DC input protection for PoE-powered network switches exposed to lightning-induced surges on 48 V DC distribution lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of DC-DC converters, absorbing multi-kW transients with minimal voltage overshoot. Use Value: Prevents catastrophic failure of downstream buck controllers by limiting input voltage to 45.4 V during 600 W surges, reducing field return rates. |
Use Scenario: Bidirectional ESD protection for USB 2.0 data lines (D+/D−) in smart home hubs subjected to human-body-model (HBM) discharges. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ ≈ 100 pF at 0 V) placed directly at connector to shunt >8 kV HBM pulses to ground. Use Value: Preserves signal rise/fall times (<1 ns response) while meeting IEC 61000-4-2 Level 4 (±15 kV air) without degrading USB 480 Mbps data integrity. |
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/I | RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification; same VWM, VBR, VC, and PPPM | Suitable for commercial-grade industrial equipment where automotive qualification is unnecessary | Select when cost sensitivity outweighs halogen-free or automotive requirements |
| SMAJ28CAHM3_A/I | Lower 400 W PPPM; SMA package (smaller footprint, higher RθJA = 140 °C/W); identical VWM/VBR specs | Preferred for space-constrained consumer electronics with lower surge exposure levels | Choose only if board area is critical and surge threat level is ≤IEC 61000-4-5 Level 2 |
Compared with SMBJ28CAHM3_A/I, SMBJ28CAHE3_A/I offers identical protection performance without halogen-free or automotive validation, while SMAJ28CAHM3_A/I trades 33 % lower surge capacity and reduced thermal margin for 30 % smaller PCB area - making SMBJ28CAHM3_A/I the optimal choice for AEC-Q101-mandated or high-reliability industrial deployments.
Availability
SMBJ28CAHM3_A/I is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and telecom power supply designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ28CAHM3_A/I 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, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in automotive, industrial, and communications infrastructure, delivering consistent clamping performance across temperature and lifetime under repetitive surge stress.
FAQ
What is the clamping voltage of SMBJ28CAHM3_A/I at its rated peak pulse current?
The SMBJ28CAHM3_A/I has a maximum clamping voltage (VC) of 45.4 V at its rated peak pulse current (IPPM) of 13.2 A, measured using the standard 10/1000 µs double-exponential surge waveform. This value ensures downstream circuitry remains within safe operating limits during transient events. The SMBJ28CAHM3_A/I maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.
Is SMBJ28CAHM3_A/I suitable for automotive applications?
Yes, SMBJ28CAHM3_A/I is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials, making it suitable for automotive applications including body control modules, infotainment power supplies, and sensor interfaces. Its bidirectional architecture and 45.4 V clamping voltage align with ISO 7637-2 and ISO 16750-2 transient immunity requirements. The SMBJ28CAHM3_A/I undergoes rigorous stress testing per AEC-Q101 standards to ensure reliability in under-hood and cabin environments.
How does the HM3 suffix differentiate SMBJ28CAHM3_A/I from other SMBJ28CA variants?
The HM3 suffix indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification - distinguishing SMBJ28CAHM3_A/I from E3 (RoHS only) and HE3 (RoHS + AEC-Q101, but not halogen-free) variants. All share identical electrical specifications (VWM = 28 V, VBR = 31.1–34.4 V, VC = 45.4 V), but only HM3 meets strict automotive material content requirements. The SMBJ28CAHM3_A/I is therefore specified where halogen-free compliance is mandatory alongside automotive qualification.
What is the thermal resistance of SMBJ28CAHM3_A/I, and how does it affect PCB layout?
SMBJ28CAHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB with 1 oz copper; reducing pad size or omitting thermal vias increases RθJA, risking thermal runaway during repetitive surges. For reliable operation, maintain minimum pad dimensions and use ≥2 thermal vias per pad. The SMBJ28CAHM3_A/I's RθJL of 20 °C/W further supports heat transfer to leads in high-density layouts.
Can SMBJ28CAHM3_A/I be used in bidirectional AC signal protection?
Yes, SMBJ28CAHM3_A/I is explicitly designed for bidirectional applications, with identical VBR, VC, and leakage characteristics in both polarities. It is commonly deployed on AC-coupled interfaces such as RS-485, CAN, and audio lines where voltage transients may occur with either polarity. Its symmetrical structure eliminates the need for orientation verification during placement, and the SMBJ28CAHM3_A/I's 1.0 µA max reverse leakage at 28 V ensures minimal signal distortion in high-impedance circuits.
SMBJ28CAHM3_A/I 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):
- 13.2A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ28CAHM3_A/I FAQ
1.How can I place an order for SMBJ28CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28CAHM3_A/I 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 SMBJ28CAHM3_A/I reliable?
The price and inventory of SMBJ28CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ28CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ28CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28CAHM3_A/I?
SMBJ28CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28CAHM3_A/I 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 SMBJ28CAHM3_A/I?
For technical support, including SMBJ28CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28CAHM3_A/I requirements.
6.How does Aetrix verify that SMBJ28CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ28CAHM3_A/I 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 SMBJ28CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ28CAHM3_A/I?
All SMBJ28CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28CAHM3_A/I, 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 SMBJ28CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMBJ28CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28CAHM3_A/I Tags
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Diodes Incorporated
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