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Vishay General Semiconductor - Diodes Division SMCJ28AHM3_A/H
- Part No.:
- SMCJ28AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28AHM3_A/H.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,284
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Product details
Overview
SMCJ28AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) 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 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 in automotive ECUs and industrial motor drives.
For engineers reviewing the SMCJ28AHM3_A/H datasheet, SMCJ28AHM3_A/H pinout, SMCJ28AHM3_A/H application, or SMCJ28AHM3_A/H equivalent, key selection criteria include clamping performance under 33 A surge, thermal resistance (RθJA = 75 °C/W), AEC-Q101 qualification status, halogen-free RoHS compliance, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ28AHM3_A/H operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its specified VBR range (31.1–34.4 V) to clamp transients within 1 ns response time. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance, critical for protecting MOSFET gates and microcontroller I/O pins against inductive switching spikes.
Designed for high-reliability environments, it meets MSL level 1 per J-STD-020 (peak reflow ≤ 260 °C), supports 200 A non-repetitive forward surge (IFSM), and maintains operation across -55 °C to +150 °C junction temperature range - with thermal derating applied above TA = 25 °C per Figure 2 in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin for protected circuitry. |
| VBR min/max | 31.1 V / 34.4 V at IT = 1 mA - Confirmed breakdown threshold range ensuring reliable turn-on without premature conduction. |
| VC @ IPPM | 45.4 V at 33.0 A - Clamped voltage during 10/1000 µs transient; limits stress on downstream ICs to safe levels. |
| PPPM | 1500 W - Peak transient energy absorption capability; enables protection against severe lightning-induced surges. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard PCB layout; determines required heatsinking for sustained power dissipation. |
| TJ max | +150 °C - Maximum allowable junction temperature; supports operation in under-hood automotive environments. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, polarity indicated by cathode band. Dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to lower-potential side of protected line; forms cathode-to-anode reverse-biased path during clamping. |
| Cathode | Reverse voltage reference terminal | Marked with band; tied to higher-potential rail (e.g., VBUS); conducts avalanche current to ground during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMC package | Enables high-density PCB layouts and compatibility with automated pick-and-place equipment (J-STD-002 solderability certified). |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress without parameter drift. |
| 1500 W peak pulse power | Provides immunity to IEC 61000-4-5 Level 4 (4 kV surge) when used with appropriate series impedance. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control modules, ADAS sensors, and body electronics. |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for global OEM supply chains without compromising electrical performance. |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive I/O Protection |
|---|---|
|
Use Scenario: Protecting 24 V battery-fed control circuits in engine management systems from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and ground, clamping spikes exceeding 34.4 V within nanoseconds. Use Value: Limits voltage seen by MCU power supply inputs to ≤45.4 V during 33 A surge, preventing latch-up or permanent damage. |
Use Scenario: Safeguarding analog sensor inputs (e.g., current shunt amplifiers) in variable-frequency drives exposed to back-EMF coupling. IC Role / Device Role / Timing Role: TVS mounted at connector interface to absorb coupled transients before reaching precision op-amps or ADC front-ends. Use Value: Maintains signal integrity by clamping induced spikes to <45.4 V while exhibiting only 1.0 µA leakage at 28 V operating bias. |
| Telecom DC Power Input Protection | Consumer Appliance Microcontroller I/O Protection |
|
Use Scenario: Securing 24–48 V DC input stages of PoE-powered network switches against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS on main power rail, coordinated with secondary MOVs and filtering components. Use Value: Absorbs up to 1500 W transient energy without degradation, enabling compliance with ITU-T K.20 and IEC 61000-4-5 standards. |
Use Scenario: Shielding GPIO and UART lines of smart home appliance controllers from ESD events during user interface handling. IC Role / Device Role / Timing Role: Localized TVS placed directly at microcontroller pin, minimizing trace inductance for sub-1 ns response. Use Value: Delivers 30 kV HBM ESD protection (per AEC-Q101 test plan) while adding <0.5 pF parasitic capacitance to preserve signal rise time. |
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 | Same VWM (28 V) and VC (45.4 V), but lower PPPM (400 W) and smaller SMA package (DO-214AC). | Limited to lower-energy transients; unsuitable for automotive load dump or industrial motor drive scenarios requiring 1500 W rating. | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2 ESD only. |
| SMCJ28AHE3_A/H | Identical electrical specs and SMC package, but uses standard RoHS-compliant (non-halogen-free) molding compound. | Acceptable for commercial/industrial use where halogen-free compliance is not mandated by OEM or regional regulation. | Choose for cost-sensitive designs where AEC-Q101 is not required and halogen content is unrestricted. |
Compared with SMAJ28AHE3/A and SMCJ28AHE3_A/H, the SMCJ28AHM3_A/H uniquely combines 1500 W surge capacity, AEC-Q101 qualification, and halogen-free construction - making it the only option among the three validated for high-reliability automotive power rail protection.
Availability
SMCJ28AHM3_A/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial motor drives, telecom power supplies, and consumer appliance controllers requiring stable component supply with full traceability and lifecycle continuity.
Supply support for SMCJ28AHM3_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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure applications demanding AEC-Q101 or extended temperature operation.
FAQ
What is the clamping voltage of the SMCJ28AHM3_A/H under maximum rated surge current?
The SMCJ28AHM3_A/H 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 at the device terminals under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMCJ28AHM3_A/H maintains this clamping performance consistently due to its glass-passivated junction and low incremental surge resistance.
Is the SMCJ28AHM3_A/H suitable for automotive applications?
Yes, the SMCJ28AHM3_A/H is AEC-Q101 qualified and explicitly designated for automotive use via its HM3 suffix, indicating halogen-free, RoHS-compliant, and AEC-Q101-validated construction. It supports operating temperatures from -55 °C to +150 °C and is tested for reliability under temperature cycling, highly accelerated life testing (HALT), and ESD stress - making the SMCJ28AHM3_A/H appropriate for engine control units, body electronics, and ADAS sensor interfaces.
How does the SMCJ28AHM3_A/H differ from the SMCJ28AHE3_A/H variant?
The SMCJ28AHM3_A/H differs from the SMCJ28AHE3_A/H solely in its molding compound: HM3 denotes halogen-free and AEC-Q101-qualified construction, whereas HE3 indicates RoHS-compliant but non-halogen-free and non-AEC-Q101 material. All electrical parameters - including VWM (28 V), VBR (31.1–34.4 V), VC (45.4 V), and PPPM (1500 W) - are identical between the two variants. The SMCJ28AHM3_A/H is required where halogen-free compliance is mandated by OEM specifications.
What is the thermal resistance of the SMCJ28AHM3_A/H, and how does it affect PCB layout?
The SMCJ28AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad per terminal. This value assumes no additional heatsinking; larger copper areas or internal layers reduce RθJA. For continuous power dissipation near its 6.5 W rating, thermal relief must be designed into the layout - underscoring why the SMCJ28AHM3_A/H is optimized for transient-only duty, not steady-state clamping.
Does the SMCJ28AHM3_A/H have polarity marking, and how is it oriented on the PCB?
Yes, the SMCJ28AHM3_A/H is unidirectional and features a visible cathode band on the SMC (DO-214AB) package body. During PCB layout, the banded end must connect to the higher-potential node (e.g., VBUS or signal line), while the anode connects toward ground or lower potential. Incorrect orientation renders the device ineffective for reverse-transient suppression, as forward conduction would occur prematurely - a critical design consideration confirmed in the SMCJ28AHM3_A/H mechanical drawings and application notes.
SMCJ28AHM3_A/H 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ28AHM3_A/H FAQ
1.How can I place an order for SMCJ28AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28AHM3_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 SMCJ28AHM3_A/H reliable?
The price and inventory of SMCJ28AHM3_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 SMCJ28AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ28AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28AHM3_A/H?
SMCJ28AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28AHM3_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 SMCJ28AHM3_A/H?
For technical support, including SMCJ28AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28AHM3_A/H requirements.
6.How does Aetrix verify that SMCJ28AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ28AHM3_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 SMCJ28AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ28AHM3_A/H?
All SMCJ28AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28AHM3_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 SMCJ28AHM3_A/H part is unused and in its original packaging.
Return procedure for SMCJ28AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ28AHM3_A/H Tags
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