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Vishay General Semiconductor - Diodes Division 3KASMC28AHE3_B/I
- Part No.:
- 3KASMC28AHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC28AHE3_B/I.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,321
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Product details
Overview
3KASMC28AHE3_B/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) in SMC (DO-214AB) package, designed for high-reliability clamping of inductive switching transients and ESD events. It delivers 3000 W peak pulse power (10/1000 μs), clamps at ≤45.4 V at 66.1 A, and operates up to +185 °C junction temperature - ideal for automotive sensor line protection and MOSFET gate drive surge suppression.
For engineers reviewing the 3KASMC28AHE3_B/I datasheet, 3KASMC28AHE3_B/I pinout, 3KASMC28AHE3_B/I application, or 3KASMC28AHE3_B/I equivalent, key selection criteria include its 28 V stand-off voltage, 31.1–34.4 V breakdown range at 1 mA, unidirectional polarity, AEC-Q101 qualification, and RoHS-compliant HE3 tape-and-reel packaging.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology with optimized junction passivation for stable clamping under high-temperature stress. Its 185 °C maximum junction temperature and MSL Level 1 rating support reflow soldering at 260 °C peak, enabling use in automotive under-hood modules and industrial motor drives where thermal cycling reliability is critical.
The device exhibits low incremental surge resistance and fast response time, achieving clamping within nanoseconds of transient onset. Its 77.5 °C/W junction-to-ambient thermal resistance and 18.3 °C/W junction-to-lead resistance allow effective heat dissipation on standard PCB pad layouts without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe working margin for 24 V automotive systems. |
| VBR min / max | 31.1 V / 34.4 V at 1 mA - Confirmed breakdown range ensures reliable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM | 45.4 V at 66.1 A - Clamping voltage limits downstream IC stress during 3000 W transients; enables robust protection of 3.3 V/5 V logic interfaces. |
| PPPM | 3000 W (10/1000 μs) - Peak pulse power rating validated per IEC 61000-4-5; supports protection against severe load-dump and inductive kick events. |
| TJ max | +185 °C - Enables operation in engine control units, powertrain modules, and industrial inverters where ambient temperatures exceed 125 °C. |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive electronics, including HTGB, HTRB, and temperature cycling. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 8.13 mm length and 6.22 mm width; compatible with automated placement and reflow processes. |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when voltage exceeds VBR; must be routed with low-inductance path to GND plane. |
| Anode | Reference node | Typically tied to system ground or common return; completes clamping path; requires low-impedance connection to minimize voltage overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process reduces parameter drift over 1000+ thermal cycles at 150 °C. |
| High-temperature capability | Rated for continuous operation at TJ = 185 °C - eliminates derating concerns in sealed enclosures or near heat sources. |
| Peak pulse power | 3000 W (10/1000 μs) - exceeds ISO 7637-2 Pulse 5a requirements for 24 V commercial vehicles. |
| AEC-Q101 qualification | Validated for automotive applications including engine management, ADAS sensors, and body control modules. |
| MSL Level 1 | Reflow-compatible up to 260 °C peak - supports single-pass lead-free assembly without moisture sensitivity concerns. |
Applications
| Automotive Sensor Protection | Industrial Motor Drive Gate Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and Hall-effect position sensors from load dump and alternator ripple in 12 V/24 V vehicle networks. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and chassis ground to clamp transients below IC absolute maximum ratings. Use Value: Prevents latch-up and permanent damage to 5 V tolerant interface ICs during 100 V/50 ms load dump events. |
Use Scenario: Shielding IGBT/MOSFET gate drivers from Miller-induced voltage spikes during high-di/dt switching in VFDs and servo amplifiers. IC Role / Device Role / Timing Role: Fast-clamping TVS across gate-source terminals to limit dv/dt-induced false triggering and oxide stress. Use Value: Maintains gate drive integrity with <1 ns response time and clamps gate voltage to ≤45.4 V during 66.1 A surges. |
| Power Supply Input Protection | Telecom Line Interface Protection |
Use Scenario: Safeguarding DC-DC converter inputs in railway signaling equipment exposed to lightning-induced surges on 48 V distribution lines. IC Role / Device Role / Timing Role: Primary-level TVS at board entry point, upstream of EMI filter and input capacitor. Use Value: Absorbs 3000 W pulses without degradation, preserving downstream regulator reliability across -40 °C to +125 °C ambient. |
Use Scenario: Protecting Ethernet PHYs and PoE injectors in outdoor base stations from induced surges on twisted-pair data lines. IC Role / Device Role / Timing Role: Bidirectional-capable protection not applicable; this unidirectional part used only on DC-biased lines like PoE power pairs. Use Value: Provides 28 V standoff with 45.4 V clamping to maintain IEEE 802.3af/at compliance while surviving repeated 10/1000 μs transients. |
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/H | Same VWM (28 V), lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W). | Not suitable for 3000 W load-dump events; limited to low-energy ESD and signal-line protection. | Select when space-constrained layout and lower surge energy suffice; avoid for automotive power rail protection. |
| SMCJ28AHE3_A/H | Same VWM (28 V), identical PPPM (3000 W), same SMC package, but rated for TJ = 175 °C (vs. 185 °C). | Lacks extended high-temperature qualification; may require derating above 150 °C ambient. | Acceptable for non-under-hood automotive or industrial use where junction temperature remains ≤175 °C. |
Compared with SMAJ28AHE3_A/H and SMCJ28AHE3_A/H, the 3KASMC28AHE3_B/I provides superior thermal margin (185 °C vs. 175 °C or 150 °C), enabling longer lifetime in thermally aggressive environments without derating, while maintaining full 3000 W surge capability in the industry-standard SMC outline.
Availability
3KASMC28AHE3_B/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial motor drive gate circuits, and telecom power-over-Ethernet interfaces requiring stable component supply, AEC-Q101 compliance, and high-temperature reliability.
Supply support for 3KASMC28AHE3_B/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 high-reliability diodes, MOSFETs, and optoelectronics for automotive, industrial, and computing markets.
The 3KASMCxxA family was engineered specifically for AEC-Q101-compliant transient suppression in harsh-temperature automotive subsystems, emphasizing thermal stability, surge robustness, and long-term parametric consistency.
FAQ
What is the breakdown voltage tolerance of the 3KASMC28AHE3_B/I?
The 3KASMC28AHE3_B/I has a specified breakdown voltage range of 31.1 V to 34.4 V at 1 mA test current, per the Vishay datasheet revision 19-Jan-2024. This ±5.2% tolerance ensures consistent clamping behavior across production lots and supports design margining for 28 V nominal systems. The 3KASMC28AHE3_B/I maintains this specification across its full operating temperature range.
Is the 3KASMC28AHE3_B/I suitable for bidirectional transient protection?
No, the 3KASMC28AHE3_B/I is unidirectional only, with cathode marked by a band and intended for clamping positive-going transients relative to ground. It cannot suppress negative transients on AC-coupled lines. For bidirectional protection, a pair of 3KASMC28AHE3_B/I devices or a dedicated bidirectional TVS such as SMBJ28CAHE3_A/H would be required.
What does the "HE3" suffix indicate in 3KASMC28AHE3_B/I?
The "HE3" suffix in 3KASMC28AHE3_B/I denotes RoHS-compliant construction with matte tin-plated leads and AEC-Q101 qualification. The "B" indicates revision level, and "I" specifies 13-inch tape-and-reel packaging with 3500 units per reel. This distinguishes it from HM3 (halogen-free) and non-qualified base part numbers.
How does the thermal resistance of the 3KASMC28AHE3_B/I affect PCB layout?
The 3KASMC28AHE3_B/I has a typical RθJA of 77.5 °C/W and RθJL of 18.3 °C/W. To maintain TJ ≤ 185 °C, PCB copper area connected to both terminals should follow Vishay's recommended pad layout (min. 0.126" × 0.185"). Minimizing trace length and maximizing thermal copper improves heat transfer, especially in high-duty-cycle surge environments.
Can the 3KASMC28AHE3_B/I replace older SMAJ28A devices in existing designs?
The 3KASMC28AHE3_B/I is not a drop-in replacement for SMAJ28A due to different package (SMC vs. SMA), higher power rating (3000 W vs. 400 W), and larger footprint. While both share 28 V VWM, substituting requires PCB layout revision, thermal validation, and surge testing. Use only after confirming mechanical fit, thermal performance, and system-level transient immunity.
3KASMC28AHE3_B/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- PAR®
- 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):
- 66.1A
- 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 (SMC)
3KASMC28AHE3_B/I FAQ
1.How can I place an order for 3KASMC28AHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC28AHE3_B/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 3KASMC28AHE3_B/I reliable?
The price and inventory of 3KASMC28AHE3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC28AHE3_B/I is usually 5 days.
3.What payment methods are accepted for 3KASMC28AHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC28AHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC28AHE3_B/I?
3KASMC28AHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC28AHE3_B/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 3KASMC28AHE3_B/I?
For technical support, including 3KASMC28AHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC28AHE3_B/I requirements.
6.How does Aetrix verify that 3KASMC28AHE3_B/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC28AHE3_B/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 3KASMC28AHE3_B/I meets industry standards.
7.What is the process for return or replacement of 3KASMC28AHE3_B/I?
All 3KASMC28AHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC28AHE3_B/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 3KASMC28AHE3_B/I part is unused and in its original packaging.
Return procedure for 3KASMC28AHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC28AHE3_B/I Tags
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