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Vishay General Semiconductor - Diodes Division SMCJ28AHE3_A/I
- Part No.:
- SMCJ28AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28AHE3_A/I.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,001
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Product details
Overview
SMCJ28AHE3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection. It features a 28 V standoff voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 45.4 V clamping voltage (VC) at 33.0 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed on power rails and signal lines of automotive ECUs and industrial motor drives.
For engineers reviewing the SMCJ28AHE3_A/I datasheet, SMCJ28AHE3_A/I pinout, SMCJ28AHE3_A/I application, or SMCJ28AHE3_A/I equivalent, key selection criteria include clamping performance under 33 A surge, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This TVS diode operates as a unidirectional clamping device, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its design targets transient suppression per IEC 61000-4-5 (surge) and ISO 7637-2 (automotive load dump), with polarity defined by cathode band marking.
The SMCJ28AHE3_A/I is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse working voltage before clamping initiates |
| VBR min/max | 31.1 V / 34.4 V at 1 mA - guaranteed breakdown range defining turn-on threshold |
| VC @ IPPM | 45.4 V at 33.0 A - clamped voltage during full 1500 W surge, limiting stress on downstream ICs |
| PPPM | 1500 W - peak pulse power handling with 10/1000 µs waveform, critical for lightning/surge immunity |
| TJ max. | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| RθJA | 75 °C/W - thermal resistance from junction to ambient, used to calculate derated power at elevated PCB temperatures |
| ID @ VWM | 1.0 µA - reverse leakage at 28 V, ensuring minimal standby power loss in battery-critical systems |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads; polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection point | Connected to protected circuit's positive rail or signal line; clamps when voltage exceeds VBR relative to anode |
| Anode (unmarked end) | Reference/ground node | Typically tied to system ground or low-side return path; completes clamping loop during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces |
| Glass passivated junction | Enhances reliability and moisture resistance versus epoxy-passivated alternatives, supporting long-term field stability |
| MSL Level 1 rating | Enables single-pass reflow without pre-baking, reducing manufacturing complexity and cost |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving protection margin for 3.3 V/5 V logic and MOSFET gate drivers |
| UL 94 V-0 molding compound | Meets flammability safety requirements for enclosed industrial and automotive enclosures |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive Control |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontrollers and CAN transceivers from load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND, clamping transients before they reach LDO inputs or MCU power pins. Use Value: Limits peak voltage to 45.4 V during 33 A surges, preventing latch-up or permanent damage to 36 V-rated power management ICs. | Use Scenario: Safeguarding gate driver ICs and current-sense amplifiers in variable-frequency drives exposed to inductive switching spikes. IC Role / Device Role / Timing Role: Mounted across DC bus rails or at driver output nodes to absorb commutation energy from IGBTs/MOSFETs. Use Value: 1500 W PPPM rating handles repetitive 10/1000 µs spikes common in PWM-driven motors without degradation. |
| Telecom Line Interface Protection | Consumer Power Adapter Input Stage |
Use Scenario: Shielding Ethernet PHYs and PoE controllers from ESD and induced surges on RJ45 ports. IC Role / Device Role / Timing Role: Paired with common-mode chokes and gas discharge tubes to form multi-stage protection network on data lines. Use Value: Sub-ns response ensures clamping occurs before sensitive PHY transceivers experience overstress, preserving signal integrity. | Use Scenario: Suppressing line-to-line and line-to-ground surges entering AC-DC adapters in smart home hubs and IoT gateways. IC Role / Device Role / Timing Role: Placed after bridge rectifier and before bulk capacitor to clamp differential-mode transients from mains coupling. Use Value: 28 V VWM aligns with 24–32 V DC bus ranges, allowing reliable operation while blocking normal ripple and passing only true surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28AHE3_A/I | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W) | Better suited for space-constrained consumer PCBs where surge energy is lower | Select when board area is limited and peak surge current stays below 10 A |
| SMCJ28CAHE3_A/I | Bidirectional variant; same VWM (28 V), symmetric clamping in both polarities | Required for AC-coupled or floating signal lines where polarity reversal may occur | Choose only if bidirectional protection is mandated by interface standard (e.g., RS-485, USB D+/D-) |
Compared with SMAJ28AHE3_A/I and SMCJ28CAHE3_A/I, the SMCJ28AHE3_A/I delivers 3.75× higher surge power handling and superior thermal performance in the same footprint class, making it optimal for automotive and industrial environments demanding robust, repeatable clamping under high-energy threats.
Availability
SMCJ28AHE3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial motor drive systems, and telecom infrastructure equipment requiring stable component supply and AEC-Q101 compliance.
Supply support for SMCJ28AHE3_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, precision, and automotive-grade qualification.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power transient suppression in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of SMCJ28AHE3_A/I at its rated peak pulse current?
The SMCJ28AHE3_A/I has a maximum clamping voltage (VC) of 45.4 V when subjected to its rated peak pulse current (IPPM) of 33.0 A using a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The SMCJ28AHE3_A/I maintains this clamping performance across its specified operating temperature range.
Is SMCJ28AHE3_A/I qualified for automotive use?
Yes, the SMCJ28AHE3_A/I carries AEC-Q101 qualification, confirmed by Vishay's ordering code suffix "HE3" and documentation in the 88394 datasheet. It is rated for junction temperatures from -55 °C to +150 °C and meets MSL Level 1 reflow requirements, making it suitable for under-hood and chassis-mounted automotive applications such as body control modules and ADAS power supplies.
How does the SMCJ28AHE3_A/I differ from the bidirectional SMCJ28CAHE3_A/I?
The SMCJ28AHE3_A/I is unidirectional and clamps only when voltage exceeds its breakdown threshold in reverse bias, with polarity marked by a cathode band. In contrast, SMCJ28CAHE3_A/I is bidirectional and provides symmetrical clamping for both polarities, with no polarity marking. Their VWM, VBR, and VC values are identical in magnitude but apply across both directions for the CA version - critical for AC or floating signal line protection.
What is the thermal resistance of SMCJ28AHE3_A/I and how does it affect power derating?
The SMCJ28AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads. This value directly determines power derating above 25 °C ambient: for example, at 85 °C ambient, its usable power drops to approximately 2.6 W (calculated via linear derating curve in Figure 2 of the datasheet). Proper pad layout is essential to achieve this RθJA.
Can SMCJ28AHE3_A/I be used in place of SMAJ28AHE3_A/I in an existing design?
SMCJ28AHE3_A/I is not a drop-in replacement for SMAJ28AHE3_A/I due to its larger SMC (DO-214AB) package versus SMA (DO-214AC), requiring PCB land pattern revision. While both share identical VWM (28 V) and similar VBR, the SMCJ version offers 1500 W PPPM versus 400 W for SMAJ - meaning it can handle significantly higher surge energy but occupies more board area. Layout change is mandatory; electrical compatibility alone is insufficient.
SMCJ28AHE3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 33A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMCJ)
SMCJ28AHE3_A/I FAQ
1.How can I place an order for SMCJ28AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28AHE3_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 SMCJ28AHE3_A/I reliable?
The price and inventory of SMCJ28AHE3_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 SMCJ28AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ28AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28AHE3_A/I?
SMCJ28AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28AHE3_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 SMCJ28AHE3_A/I?
For technical support, including SMCJ28AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28AHE3_A/I requirements.
6.How does Aetrix verify that SMCJ28AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ28AHE3_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 SMCJ28AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ28AHE3_A/I?
All SMCJ28AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28AHE3_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 SMCJ28AHE3_A/I part is unused and in its original packaging.
Return procedure for SMCJ28AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ28AHE3_A/I Tags
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