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Vishay General Semiconductor - Diodes Division SMCJ28AHE3/9AT
- Part No.:
- SMCJ28AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28AHE3/9AT.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,027
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Product details
Overview
SMCJ28AHE3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 28 V standoff voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 45.4 V maximum clamping voltage (VC) at 33.0 A peak pulse current (IPPM), and 1500 W peak pulse power (10/1000 µs waveform), commonly deployed on DC power rails and I/O lines in automotive ECUs and industrial controllers.
For engineers reviewing the SMCJ28AHE3/9AT datasheet, SMCJ28AHE3/9AT pinout, SMCJ28AHE3/9AT application, or SMCJ28AHE3/9AT equivalent, key selection criteria include clamping performance under 33 A surge, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), unidirectional polarity marking, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ28AHE3/9AT operates as a silicon avalanche diode that enters controlled breakdown above its VWM to clamp transients while maintaining low dynamic impedance. Its glass-passivated junction ensures stable leakage (<1.0 µA at 28 V) and fast response time (<1.0 ps), enabling suppression of ESD, inductive switching spikes, and lightning-induced surges before downstream ICs are damaged.
Designed for surface-mount use in high-reliability environments, it meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), supports 200 A non-repetitive forward surge (8.3 ms half-sine), and delivers consistent clamping across -55 °C to +150 °C operating junction temperature range - critical for under-hood automotive and industrial power supply protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin. |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during transients. |
| VC @ IPPM | 45.4 V at 33.0 A - Clamped voltage during 1500 W surge; determines maximum stress on protected circuitry. |
| IPPM | 33.0 A (10/1000 µs) - Peak surge current capability; validates protection against ISO 7637-2 Pulse 1/2/5a. |
| PPPM | 1500 W - Peak pulse power rating; enables single-device handling of high-energy transients without derating. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in engine bay or enclosed industrial enclosures. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance; informs heatsinking requirements on standard PCB layout. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, molded plastic case with matte tin-plated leads; polarity indicated by cathode band on one end; compliant with UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection point in unidirectional configuration | Connected to protected line (e.g., +12 V rail); clamps positive transients to ground when voltage exceeds VBR. |
| Anode (unmarked end) | Reference/ground return path | Typically tied to system ground or low-impedance return plane; completes clamping path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including powertrain, body control, and ADAS modules per stress test requirements. |
| Glass passivated junction | Ensures long-term stability of leakage current and breakdown voltage under thermal cycling and humidity exposure. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for 3.3 V/5 V logic interfaces. |
| MSL Level 1 rating | Enables direct placement into standard lead-free reflow profiles without baking or special handling. |
| 1500 W peak pulse power | Provides single-device protection against severe load dump (ISO 16750-2) and coupled lightning surges (IEC 61000-4-5). |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs in engine control units exposed to load dump pulses up to 35 V. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between VIN and GND, acting as crowbar during overvoltage events. Use Value: Limits clamped voltage to 45.4 V, ensuring downstream LDOs and MCUs remain within absolute maximum ratings during ISO 16750-2 Test 4a. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) of pressure sensors in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional device used across signal and return paths to suppress common-mode transients. Use Value: With <1.0 µA leakage at 28 V, avoids loading precision sensor outputs while clamping ESD events to <45.4 V. |
| Telecom DC Power Input Protection | OBD-II Diagnostic Port Protection |
|
Use Scenario: Shielding 48 V PoE-powered network switches from induced surges on building-wide cabling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input bulk capacitor rail, coordinated with upstream fuses. Use Value: 1500 W rating handles multiple 10/1000 µs surges per IEC 61000-4-5 Level 4 without degradation. |
Use Scenario: Hardening vehicle OBD-II connector pins (pins 16/VBAT, 4/GND, 5/SGND) against jump-start transients and ESD. IC Role / Device Role / Timing Role: Discrete TVS mounted directly at connector footprint to minimize inductance in clamping path. Use Value: SMC package allows compact layout with <10 nH parasitic inductance, achieving sub-100 ps response to 8 kV contact ESD. |
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 | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VC specs but reduced surge capacity. | Suitable only for low-energy transients (e.g., board-level ESD), not load dump or lightning. | Select when space-constrained and surge threat level is limited to IEC 61000-4-2 ±8 kV. |
| SMCJ28CAHE3/9AT | Bidirectional variant; identical VWM, VBR, VC, and PPPM, but symmetric clamping in both polarities. | Required for AC-coupled or floating signal lines where negative transients occur (e.g., RS-485, CAN bus). | Choose when protecting bidirectional data lines or ungrounded power domains where polarity reversal is possible. |
Compared with SMAJ28AHE3/A, SMCJ28AHE3/9AT delivers 3.75× higher surge energy handling in the same mounting footprint; versus SMCJ28CAHE3/9AT, it offers lower cost and simpler biasing for DC-only rails but lacks negative-voltage clamping capability.
Availability
SMCJ28AHE3/9AT is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interface design, and telecom DC input protection requiring stable component supply across multi-year production cycles.
Supply support for SMCJ28AHE3/9AT 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 AEC-Q qualification.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh-environment applications including automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of the SMCJ28AHE3/9AT at its rated peak pulse current?
The SMCJ28AHE3/9AT has a maximum clamping voltage (VC) of 45.4 V at its rated peak pulse current (IPPM) of 33.0 A under 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 surge events. The SMCJ28AHE3/9AT maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C), making it suitable for under-hood automotive deployment.
Is the SMCJ28AHE3/9AT AEC-Q101 qualified?
Yes, the SMCJ28AHE3/9AT is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3", which denotes RoHS-compliant and AEC-Q101 qualified variants. This qualification covers stress tests including high-temperature operating life, temperature cycling, and ESD, validating its suitability for automotive powertrain and chassis applications. The SMCJ28AHE3/9AT is explicitly listed in Vishay's AEC-Q101 certified product documentation.
What is the standoff voltage (VWM) and why is it critical for SMCJ28AHE3/9AT selection?
The standoff voltage (VWM) of the SMCJ28AHE3/9AT is 28 V - the maximum continuous reverse voltage it can withstand without entering breakdown. This parameter must be ≥10–15% above the normal operating voltage of the protected line (e.g., 24 V nominal systems) to prevent leakage or premature conduction. Selecting SMCJ28AHE3/9AT for a 24 V rail ensures reliable blocking during steady-state operation while allowing rapid clamping during transients exceeding 31.1 V.
How does the SMCJ28AHE3/9AT differ from bidirectional TVS diodes like SMCJ28CAHE3/9AT?
The SMCJ28AHE3/9AT is unidirectional and features a cathode band for polarity identification, clamping only positive transients relative to ground. In contrast, SMCJ28CAHE3/9AT is bidirectional with no polarity marking and clamps transients of either polarity symmetrically. The SMCJ28AHE3/9AT offers lower cost and simpler integration on DC rails, whereas SMCJ28CAHE3/9AT is required for AC signals or floating grounds. Both share identical VWM, VC, and PPPM ratings.
What PCB layout guidance applies to the SMCJ28AHE3/9AT for optimal surge performance?
For optimal surge performance, the SMCJ28AHE3/9AT must be mounted on minimum 8.0 mm × 8.0 mm copper pads per terminal, as specified in Vishay's datasheet Figure 2 derating curves. Short, wide traces to ground and protected line minimize parasitic inductance, preserving sub-nanosecond response. Thermal relief should be avoided on pads to ensure low RθJA (75 °C/W). The SMCJ28AHE3/9AT's DO-214AB outline requires 0.305–0.320 inch body length clearance.
SMCJ28AHE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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)
SMCJ28AHE3/9AT FAQ
1.How can I place an order for SMCJ28AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28AHE3/9AT 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 SMCJ28AHE3/9AT reliable?
The price and inventory of SMCJ28AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ28AHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ28AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28AHE3/9AT?
SMCJ28AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28AHE3/9AT 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 SMCJ28AHE3/9AT?
For technical support, including SMCJ28AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28AHE3/9AT requirements.
6.How does Aetrix verify that SMCJ28AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ28AHE3/9AT 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 SMCJ28AHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ28AHE3/9AT?
All SMCJ28AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28AHE3/9AT, 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 SMCJ28AHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ28AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ28AHE3/9AT Tags
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