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Vishay General Semiconductor - Diodes Division 3KASMC28HE3/57T
- Part No.:
- 3KASMC28HE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC28HE3/57T.pdf
- Description:
- TVS DIODE 28VWM 50VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,996
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Product details
Overview
3KASMC28HE3/57T from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor (TVS) diode designed for high-energy surge clamping in automotive and industrial power rails. It features a 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown range (VBR), 3000 W peak pulse power (10/1000 μs), 45.4 V maximum clamping voltage at 66.1 A IPPM, and AEC-Q101 qualification for under-hood electronics protection.
For engineers reviewing the 3KASMC28HE3/57T datasheet, 3KASMC28HE3/57T pinout, 3KASMC28HE3/57T application, or 3KASMC28HE3/57T equivalent, this device serves as a high-reliability, high-temperature (TJ = 185 °C) transient suppressor for DC bus lines, motor drive circuits, and sensor interface protection where fast response (<1 ns), low incremental surge resistance, and MSL Level 1 reflow compatibility are critical.
Technical Context
The 3KASMC28HE3/57T employs passivated anisotropic rectifier technology optimized for junction stability at elevated temperatures. Its unidirectional architecture enables forward conduction during overvoltage events while maintaining low leakage (≤1.0 μA at VWM) and tight VBR tolerance (±5% typical).
It delivers 3000 W peak pulse power per 10/1000 μs waveform with a clamping ratio (VC/VBR) of ~1.42, supported by thermal resistance RθJA = 77.5 °C/W and RθJL = 18.3 °C/W. The device is rated for IFSM = 200 A (8.3 ms half-sine) and operates across –65 °C to +185 °C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 24 V systems. |
| VBR (min/max) | 31.1 V / 34.4 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold. |
| PPPM | 3000 W - Peak surge energy handling capability with 10/1000 μs waveform; suitable for ISO 7637-2 Pulse 5a/b and IEC 61000-4-5 Level 4 transients. |
| VC @ IPPM | 45.4 V - Clamped voltage at 66.1 A peak surge current; limits downstream IC stress during worst-case surges. |
| TJ max. | +185 °C - Enables placement near heat sources (e.g., power MOSFETs, engine control units) without derating. |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive electronic components including HTGB, HTRB, and TCT. |
| Package | DO-214AB (SMC) - Industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.06 mm lead spacing. |
Pinout & Package
Package: DO-214AB (SMC), molded epoxy case meeting UL 94 V-0; matte tin-plated leads compliant with J-STD-002 and JESD 22-B102; cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point during clamping | Connected to protected circuit ground or low-side return path; forms low-impedance shunt to ground during overvoltage. |
| Cathode | Reverse-biased terminal during normal operation | Connected to line being protected (e.g., 24 V supply rail); blocks leakage until VBR is exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier design improves long-term reliability under thermal cycling and humidity exposure. |
| High-temperature operation | TJ = 185 °C rating allows direct mounting on hot PCB zones without thermal derating penalties. |
| Fast response time | <1 ns turn-on enables suppression before sensitive downstream logic or analog circuitry is damaged. |
| Low incremental surge resistance | Minimizes voltage overshoot during high di/dt transients, improving clamping precision. |
| MSL Level 1 | Rated for peak reflow temperature up to 260 °C, eliminating moisture sensitivity concerns in SMT assembly. |
Applications
| Automotive Power Distribution | Industrial Motor Drive Protection |
|---|---|
Use Scenario: Suppressing load dump transients (ISO 7637-2 Pulse 5a) on 24 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and local regulator input. Use Value: Limits voltage excursion to ≤45.4 V during 100 V/100 ms pulses, preventing LDO failure and MCU brownout. |
Use Scenario: Protecting gate drivers and current sense amplifiers from inductive kickback in BLDC motor inverters. IC Role / Device Role / Timing Role: High-power TVS mounted across DC bus or phase-leg outputs. Use Value: Absorbs 3000 W surge energy without degradation, preserving signal integrity and MOSFET gate oxide integrity. |
| Telecom DC Power Feeds | Sensor Interface Protection |
Use Scenario: Guarding PoE-powered equipment inputs against lightning-induced surges on 48 V telecom lines. IC Role / Device Role / Timing Role: Primary clamping device upstream of DC/DC converter and Ethernet PHY. Use Value: Clamps 48 V line to 45.4 V within nanoseconds, ensuring compliance with IEC 61000-4-5 Level 4 (4 kV) immunity. |
Use Scenario: Shielding analog front-end circuits (e.g., pressure, temperature sensors) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 μA) TVS placed directly at connector entry point. Use Value: Maintains signal fidelity with minimal offset drift while suppressing ±15 kV contact ESD per IEC 61000-4-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A | Lower PPPM (400 W), higher VC (45.7 V), same VWM (28 V), DO-214AC (SMA) package. | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5 or IEC 61000-4-5 Level 4. | Select when cost and board space constrain use of 3000 W devices and surge threat level is ≤400 W. |
| SMCJ28A | Same PPPM (3000 W), identical DO-214AB (SMC) package, but VBR min/max = 31.1–34.4 V and VC = 45.4 V match exactly; AEC-Q101 qualified. | No functional difference in clamping performance or automotive suitability; differs only in marking and internal process revision. | Valid alternative with identical electrical and mechanical specs; verify packaging code (HM3/57T vs. standard HM3) for tape-and-reel compatibility. |
Compared with SMAJ28A and SMCJ28A, the 3KASMC28HE3/57T offers identical high-power clamping performance to SMCJ28A but with enhanced thermal robustness (185 °C TJ max vs. 150 °C for many SMCJ variants) and tighter process control for automotive-grade consistency.
Availability
3KASMC28HE3/57T is available at Aetrix Electronics and suitable for automotive power distribution, industrial motor drive protection, and telecom DC power feeds requiring stable component supply, AEC-Q101 compliance, and high-temperature operational assurance.
Supply support for 3KASMC28HE3/57T 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 TVS devices with emphasis on reliability, power handling, and automotive qualification.
The 3KASMC28HE3/57T belongs to Vishay's PAR® (Passivated Anisotropic Rectifier) TVS family, engineered specifically for high-temperature, high-reliability transient suppression in harsh automotive and industrial environments.
FAQ
What is the maximum junction temperature rating for the 3KASMC28HE3/57T?
The 3KASMC28HE3/57T is rated for a maximum junction temperature of +185 °C, enabling reliable operation in under-hood automotive applications and high-ambient industrial environments without thermal derating. This specification is validated per AEC-Q101 stress testing and confirmed in the Vishay datasheet Document Number 89962.
Is the 3KASMC28HE3/57T AEC-Q101 qualified?
Yes, the 3KASMC28HE3/57T is explicitly AEC-Q101 qualified, as stated in the Vishay datasheet (Document Number 89962, page 1). This qualification covers tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), temperature cycling (TCT), and unbiased highly accelerated stress test (UHAST).
What does the "HM3/57T" suffix indicate in 3KASMC28HE3/57T?
The "HM3/57T" suffix denotes RoHS-compliant, AEC-Q101-qualified construction (HM3) in a 7-inch plastic tape-and-reel format with 850 units per reel (57T). The "E3" in the part number indicates Vishay's standard environmental compliance coding, confirming halogen-free and lead-free compliance per JEDEC JS709A and Directive 2011/65/EU.
What is the clamping voltage of the 3KASMC28HE3/57T at its rated peak pulse current?
The 3KASMC28HE3/57T exhibits a maximum clamping voltage (VC) of 45.4 V at its rated peak pulse current (IPPM) of 66.1 A, measured using the standardized 10/1000 μs waveform. This value is specified in the Electrical Characteristics table on page 2 of the Vishay datasheet 89962.
Does the 3KASMC28HE3/57T have a unidirectional or bidirectional configuration?
The 3KASMC28HE3/57T is a unidirectional TVS diode, as confirmed in the Features section of the Vishay datasheet: "Available in uni-directional polarity only." Its cathode is marked by a color band, and it conducts only during reverse overvoltage events-ideal for DC rail protection where forward conduction must be avoided.
3KASMC28HE3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 50V
- Current - Peak Pulse (10/1000µs):
- 60A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 185°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
3KASMC28HE3/57T FAQ
1.How can I place an order for 3KASMC28HE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC28HE3/57T 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 3KASMC28HE3/57T reliable?
The price and inventory of 3KASMC28HE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC28HE3/57T is usually 5 days.
3.What payment methods are accepted for 3KASMC28HE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC28HE3/57T transactions.
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4.How is shipping managed for 3KASMC28HE3/57T?
3KASMC28HE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC28HE3/57T 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 3KASMC28HE3/57T?
For technical support, including 3KASMC28HE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC28HE3/57T requirements.
6.How does Aetrix verify that 3KASMC28HE3/57T is sourced from the original manufacturer or authorized distributors?
All 3KASMC28HE3/57T 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 3KASMC28HE3/57T meets industry standards.
7.What is the process for return or replacement of 3KASMC28HE3/57T?
All 3KASMC28HE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC28HE3/57T, 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 3KASMC28HE3/57T part is unused and in its original packaging.
Return procedure for 3KASMC28HE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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