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Vishay General Semiconductor - Diodes Division 3KASMC43AHE3_A/I
- Part No.:
- 3KASMC43AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC43AHE3_A/I.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,399
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Product details
Overview
3KASMC43AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for high-energy surge clamping in automotive and industrial power rails. It delivers 3000 W peak pulse power (10/1000 μs), clamps at 69.4 V under 43.2 A surge current, and operates up to 185 °C junction temperature. It is AEC-Q101 qualified and housed in DO-214AB (SMC) package for engine control unit (ECU) power line protection.
For engineers reviewing the 3KASMC43AHE3_A/I datasheet, 3KASMC43AHE3_A/I pinout, 3KASMC43AHE3_A/I application, or 3KASMC43AHE3_A/I equivalent, key selection criteria include clamping voltage (VC = 69.4 V), stand-off voltage (VWM = 43 V), unidirectional polarity, thermal resistance (RθJA = 77.5 °C/W), and MSL Level 1 reflow compatibility.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for high-temperature stability and low incremental surge resistance. Its 185 °C maximum junction temperature and AEC-Q101 qualification confirm suitability for under-hood automotive environments where thermal derating and reliability are critical.
The device exhibits fast response time and excellent clamping capability with VC = 69.4 V at IPPM = 43.2 A (10/1000 μs), while maintaining low reverse leakage (IR ≤ 1.0 μA at VWM = 43 V, TA = 25 °C) and VF = 3.5 V at 100 A forward surge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC rail margin. |
| VBR (min/max) | 47.8 V / 52.8 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | 69.4 V - Clamped voltage during 43.2 A 10/1000 μs surge; determines protected circuit's maximum overvoltage exposure. |
| PPPM | 3000 W - Peak pulse power handling per 10/1000 μs waveform; supports high-energy transients like load dump. |
| TJ max. | 185 °C - Enables operation in high-ambient under-hood locations without thermal shutdown or degradation. |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and MSL Level 1 rating. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing. |
Pinout & Package
DO-214AB (SMC) package: cathode-indicating band on one end; two-terminal device with anode and cathode leads. Mounting requires minimum pad layout per Vishay specification (0.126″ × 0.060″ pads, 0.185″ max center-to-center).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction or surge clamping | Connected to protected circuit ground or low-side return path; must handle 200 A IFSM surge. |
| Cathode | Current exit point during reverse-biased clamping | Connected to protected line (e.g., 43 V supply rail); color band identifies this terminal for correct PCB orientation. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process improves long-term reliability under thermal cycling and humidity. |
| High TJ capability | 185 °C max junction temperature enables use in engine bay, transmission control, and battery management systems. |
| Low RθJA | 77.5 °C/W thermal resistance allows effective self-cooling on standard FR-4 PCBs without heatsinks. |
| MSL Level 1 | Rated for peak reflow of 260 °C - compatible with standard lead-free SMT assembly processes. |
| Uni-directional polarity | Prevents unintended conduction during normal forward-biased operation; ideal for DC power rail protection. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Power Input |
|---|---|
Use Scenario: Protects 43 V auxiliary power rail in diesel ECU against ISO 7637-2 load dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamps surges above 43 V to limit voltage seen by downstream DC/DC converters and microcontrollers. Use Value: Withstands 3000 W pulses and operates up to 185 °C, ensuring robustness in high-temperature engine compartments. |
Use Scenario: Shields 48 V DC input stage of programmable logic controller against inductive switching spikes from solenoids and contactors. IC Role / Device Role / Timing Role: Fast-response TVS diverts surge energy away from input rectifiers and bulk capacitors during field wiring faults. Use Value: Clamping at 69.4 V prevents overvoltage damage to 75 V-rated input stages while supporting 200 A IFSM surge tolerance. |
| Telecom Remote Radio Unit (RRU) | EV Battery Management System (BMS) |
Use Scenario: Guards 43 V bias supply in outdoor macrocell RRUs exposed to lightning-induced surges on power feeds. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbs repetitive 10/1000 μs transients without degradation, preserving signal integrity. Use Value: Low IR (≤1.0 μA) minimizes standby leakage; AEC-Q101 qualification ensures field longevity in harsh environmental conditions. |
Use Scenario: Protects isolated CAN and sensor supply lines in high-voltage EV battery packs subject to ground bounce and coupling noise. IC Role / Device Role / Timing Role: Secondary-level TVS placed after primary protection to clamp residual transients reaching sensitive analog front-ends. Use Value: DO-214AB footprint enables compact placement near connectors; 185 °C rating matches BMS thermal design requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A-E3/57T (Vishay) | Same VWM (43 V) and VC (69.4 V), but lower PPPM (400 W) and smaller SMA package (RθJA = 110 °C/W). | Limited to lower-energy transients; unsuitable for load dump or high-reliability automotive use. | Select only for space-constrained consumer or telecom applications with <500 W surge requirements. |
| 1.5KE43A (ON Semiconductor) | Through-hole DO-201 package; same VWM/VC specs but higher RθJA (~65 °C/W on infinite heatsink), no AEC-Q101 qualification. | Requires manual soldering or wave soldering; not validated for automotive thermal cycling or vibration stress. | Use only in non-automotive industrial equipment where board-level reliability testing is performed internally. |
Compared with SMAJ43A-E3/57T and 1.5KE43A, the 3KASMC43AHE3_A/I provides superior surge handling (3000 W vs. 400 W / 1500 W), automotive-grade qualification, and surface-mount scalability-making it the preferred choice for production automotive ECUs and high-reliability industrial controllers.
Availability
3KASMC43AHE3_A/I is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC power inputs, telecom remote radio units, and EV battery management systems requiring stable component supply and long-term lifecycle support.
Supply support for 3KASMC43AHE3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and high-temperature performance.
The 3KASMCxxA series belongs to Vishay's PAR® family of high-power TVS diodes, engineered specifically for automotive-grade transient suppression in demanding under-hood and industrial environments.
FAQ
What is the clamping voltage of the 3KASMC43AHE3_A/I under full-rated surge current?
The 3KASMC43AHE3_A/I clamps at 69.4 V when subjected to its rated peak pulse current of 43.2 A (10/1000 μs waveform). This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet (Document Number: 89962, page 2). The clamping voltage directly determines the maximum overvoltage stress imposed on downstream components during surge events, making it a critical parameter for system-level protection design. Engineers must verify that all protected ICs and passives have voltage ratings exceeding 69.4 V.
Is the 3KASMC43AHE3_A/I suitable for automotive applications?
Yes, the 3KASMC43AHE3_A/I is AEC-Q101 qualified and rated for 185 °C maximum junction temperature, making it fully suitable for automotive applications including engine control units, body control modules, and battery management systems. Its DO-214AB (SMC) package meets MSL Level 1 reflow requirements, and its 3000 W peak pulse power rating supports ISO 7637-2 load dump compliance. The 3KASMC43AHE3_A/I has undergone rigorous stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD validation per automotive standards.
What does the "_A/I" suffix mean in 3KASMC43AHE3_A/I?
The "_A/I" suffix in 3KASMC43AHE3_A/I indicates the packaging configuration: "A" denotes the base P/NHM3 variant (RoHS-compliant and AEC-Q101 qualified), and "I" specifies the delivery mode as 13-inch diameter plastic tape and reel with a base quantity of 3500 units. This ordering code aligns with Vishay's standardized packaging nomenclature shown in the "Ordering Information" section of Document Number 89962. The "HE3" portion confirms halogen-free construction per JEDEC JS709A.
How does the thermal resistance of the 3KASMC43AHE3_A/I affect PCB layout?
The 3KASMC43AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 77.5 °C/W when mounted on the minimum recommended pad layout. This means PCB copper area and via count directly impact steady-state temperature rise: increasing thermal pad size or adding thermal vias reduces effective RθJA and improves power dissipation margin. For reliable 6.0 W continuous operation, designers must follow Vishay's specified mounting pad dimensions (0.126″ × 0.060″ minimum) and avoid excessive trace length between the device and ground plane to maintain thermal performance.
Can the 3KASMC43AHE3_A/I replace older 1.5KE43A parts in existing designs?
No, the 3KASMC43AHE3_A/I is not a direct drop-in replacement for the through-hole 1.5KE43A due to fundamental differences in package (DO-214AB SMD vs. DO-201 axial), thermal behavior (RθJA = 77.5 °C/W vs. ~65 °C/W on heatsink), and qualification (AEC-Q101 vs. no automotive qualification). While both share VWM = 43 V and similar VC, the 3KASMC43AHE3_A/I requires SMT reflow processing and offers higher surge capability (3000 W vs. 1500 W). Any migration must include PCB redesign, thermal validation, and requalification per application requirements.
3KASMC43AHE3_A/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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 43.2A
- 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)
3KASMC43AHE3_A/I FAQ
1.How can I place an order for 3KASMC43AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC43AHE3_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 3KASMC43AHE3_A/I reliable?
The price and inventory of 3KASMC43AHE3_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 3KASMC43AHE3_A/I is usually 5 days.
3.What payment methods are accepted for 3KASMC43AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC43AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC43AHE3_A/I?
3KASMC43AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC43AHE3_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 3KASMC43AHE3_A/I?
For technical support, including 3KASMC43AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC43AHE3_A/I requirements.
6.How does Aetrix verify that 3KASMC43AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC43AHE3_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 3KASMC43AHE3_A/I meets industry standards.
7.What is the process for return or replacement of 3KASMC43AHE3_A/I?
All 3KASMC43AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC43AHE3_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 3KASMC43AHE3_A/I part is unused and in its original packaging.
Return procedure for 3KASMC43AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC43AHE3_A/I Tags
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