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Vishay General Semiconductor - Diodes Division 3KASMC17HE3/9AT
- Part No.:
- 3KASMC17HE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC17HE3/9AT.pdf
- Description:
- TVS DIODE 17VWM 30.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,731
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Product details
Overview
3KASMC17HE3/9AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 17 V stand-off voltage, 18.9–20.9 V breakdown at 1 mA, 3000 W peak pulse power (10/1000 μs), 109 A peak surge current, and 27.6 V clamping voltage at IPPM - deployed for automotive power line and sensor signal line protection.
For engineers reviewing the 3KASMC17HE3/9AT datasheet, 3KASMC17HE3/9AT pinout, 3KASMC17HE3/9AT application, or 3KASMC17HE3/9AT equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance (RθJA = 77.5 °C/W), junction temperature limit (TJ max = 185 °C), and real-world clamping behavior under transient stress.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve stable clamping performance across -65 °C to +185 °C operating range and withstand repetitive surge events per IEC 61000-4-5. Its low incremental surge resistance and fast response time ensure effective suppression of inductive switching transients on 12 V and 24 V automotive rails.
The device operates exclusively in unidirectional mode with cathode band polarity marking, meets MSL Level 1 (260 °C reflow), and is qualified to AEC-Q101 for automotive under-hood applications - supporting robust ESD and lightning surge immunity without derating below TJ = 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 17 V - maximum continuous reverse voltage before significant leakage; sets threshold for clamping activation on 12 V systems. |
| VBR (Breakdown Voltage) | 18.9–20.9 V at IT = 1 mA - defines reliable avalanche onset; ensures consistent turn-on across production lots. |
| VC (Clamping Voltage) | 27.6 V at IPPM = 109 A - limits peak voltage seen by protected IC during 3000 W transient, preserving downstream MOSFETs or sensors. |
| PPPM (Peak Pulse Power) | 3000 W (10/1000 μs waveform) - supports high-energy surges typical of ISO 7637-2 Pulse 1/2a/5a in automotive environments. |
| TJ max | +185 °C - enables operation in engine control units and transmission modules where ambient exceeds 125 °C. |
| RθJA | 77.5 °C/W - determines thermal rise under DC bias; requires minimum pad layout per datasheet for safe 6.0 W dissipation at TL = 75 °C. |
| AEC-Q101 Qualified | Yes - validated for automotive reliability including HTGB, HTRB, and temperature cycling; required for ASIL-B/C subsystems. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, UL 94 V-0 molding compound, cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path; forms clamping loop with cathode to shunt surge energy. |
| Cathode | High-side connection point | Connected to protected line (e.g., battery rail or sensor output); avalanche conduction begins here during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Reduces parameter drift over lifetime and improves long-term stability under thermal cycling in automotive under-hood use. |
| 185 °C junction rating | Enables placement near heat sources (e.g., power converters) without derating, eliminating need for remote mounting or heatsinking. |
| 3000 W peak pulse power (10/1000 μs) | Meets ISO 7637-2 Pulse 5a (load dump) requirements for 12 V systems without external series impedance. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage margin between breakdown and clamping, reducing stress on downstream components during fast transients. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without preconditioning; eliminates moisture-related popcorning risk in SMT assembly. |
Applications
| Automotive Power Rail Protection | Engine Control Unit (ECU) Sensor Interface |
|---|---|
Use Scenario: Suppresses load dump transients (ISO 7637-2 Pulse 5a) on 12 V battery-fed microcontroller power inputs. IC Role / Device Role / Timing Role: Unidirectional TVS clamps voltage spikes above 27.6 V within nanoseconds to protect LDOs and MCU VDD pins. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic supplies during alternator regulation failure. |
Use Scenario: Shields analog front-end inputs of crankshaft/camshaft position sensors from inductive kickback. IC Role / Device Role / Timing Role: Fast-response TVS absorbs 100 ns–1 μs transients induced by solenoid actuation near sensor wiring. Use Value: Maintains signal integrity and prevents false triggering in Hall-effect or VR sensor outputs during cold cranking. |
| Industrial Motor Drive I/O Protection | Telecom Power Supply Input Stage |
Use Scenario: Guards digital I/O lines connected to relay coils or stepper motor drivers against back-EMF. IC Role / Device Role / Timing Role: TVS diverts inductive energy away from isolated GPIOs or optocoupler inputs during coil de-energization. Use Value: Eliminates need for RC snubbers or varistors, reducing BOM count while meeting IEC 61000-4-4 EFT immunity. |
Use Scenario: Protects AC-DC adapter primary-side controller ICs from lightning-induced surges on 48 V telecom input rails. IC Role / Device Role / Timing Role: Clamps common-mode transients up to 3 kV (10/700 μs) before they reach PWM controllers or gate drivers. Use Value: Enables compliance with GR-1089-CORE Section 4.5.2 without adding secondary-stage MOVs or GDTs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17A | Lower PPPM (400 W), same DO-214AC (SMA) package, VBR = 18.9–20.9 V, VC = 27.6 V - but smaller thermal mass and lower surge rating. | Not AEC-Q101 qualified; limited to consumer/industrial use; unsuitable for automotive load dump. | Select only for cost-sensitive non-automotive designs with <500 W surge exposure. |
| SMCJ17A | Same DO-214AB (SMC) package, identical VWM/VBR/VC, AEC-Q101 qualified, but rated for 1500 W PPPM (10/1000 μs) - half the energy handling of 3KASMC17HE3/9AT. | Valid for ISO 7637-2 Pulse 1/2a, but fails Pulse 5a without series impedance; requires derating above 125 °C. | Choose when space-constrained layouts demand SMC footprint but full 3000 W capability is not required. |
Compared with SMAJ17A and SMCJ17A, the 3KASMC17HE3/9AT delivers 2× higher peak pulse power in the same SMC package, maintains AEC-Q101 qualification at 185 °C, and sustains clamping performance across full automotive temperature range without external circuitry.
Availability
3KASMC17HE3/9AT is available at Aetrix Electronics and suitable for automotive ECU power rails, industrial motor drive I/O interfaces, telecom power supply inputs, and sensor signal conditioning circuits requiring stable component supply with full AEC-Q101 traceability.
Supply support for 3KASMC17HE3/9AT 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, rectifiers, TVS devices, and power MOSFETs with emphasis on high-reliability and automotive-grade performance.
The 3KASMC family was engineered specifically for harsh-environment transient suppression - targeting under-hood automotive systems needing 185 °C operation, AEC-Q101 validation, and 3000 W surge immunity in compact SMC packaging.
FAQ
What is the clamping voltage of the 3KASMC17HE3/9AT at its rated peak pulse current?
The 3KASMC17HE3/9AT has a maximum clamping voltage (VC) of 27.6 V at its peak pulse current (IPPM) of 109 A, measured using a 10/1000 μs waveform. This value ensures protected circuits remain below critical overvoltage thresholds during high-energy transients like automotive load dump. The 3KASMC17HE3/9AT achieves this with low incremental surge resistance and stable avalanche characteristics across temperature.
Is the 3KASMC17HE3/9AT qualified for automotive applications?
Yes, the 3KASMC17HE3/9AT is AEC-Q101 qualified and rated for operation up to TJ = +185 °C, making it suitable for under-hood automotive applications including engine control units, body control modules, and ADAS sensor interfaces. The 3KASMC17HE3/9AT also meets MSL Level 1 and passes JESD201 Class 2 whisker testing, confirming robustness in automotive manufacturing and field environments.
What package does the 3KASMC17HE3/9AT use, and what are its key mechanical features?
The 3KASMC17HE3/9AT uses the DO-214AB (SMC) surface-mount package with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Its molding compound meets UL 94 V-0 flammability rating, and the cathode is marked by a visible color band. The 3KASMC17HE3/9AT's standardized SMC footprint enables drop-in replacement in existing layouts designed for similar power TVS devices.
How does the 3KASMC17HE3/9AT compare to standard SMAJ-series TVS diodes?
The 3KASMC17HE3/9AT provides 3000 W peak pulse power (10/1000 μs), double that of SMAJ17A (400 W), and uses the larger DO-214AB (SMC) package for superior thermal dissipation. Unlike SMAJ17A, the 3KASMC17HE3/9AT is AEC-Q101 qualified and rated for TJ = 185 °C. The 3KASMC17HE3/9AT also features lower RθJA (77.5 °C/W) and tighter VBR tolerance, enabling more predictable clamping in safety-critical systems.
What is the maximum reverse leakage current of the 3KASMC17HE3/9AT at its stand-off voltage?
At VWM = 17 V and TA = 25 °C, the 3KASMC17HE3/9AT exhibits a maximum reverse leakage current (IR) of 1.0 μA. At elevated temperature (TJ = 150 °C), IR increases to 10 μA - still well below levels that would compromise system standby power or sensor reference stability. This low leakage is maintained due to junction passivation and optimized anisotropic rectifier design in the 3KASMC17HE3/9AT.
3KASMC17HE3/9AT 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):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 30.5V
- Current - Peak Pulse (10/1000µs):
- 98.4A
- 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)
3KASMC17HE3/9AT FAQ
1.How can I place an order for 3KASMC17HE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC17HE3/9AT 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 3KASMC17HE3/9AT reliable?
The price and inventory of 3KASMC17HE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC17HE3/9AT is usually 5 days.
3.What payment methods are accepted for 3KASMC17HE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC17HE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC17HE3/9AT?
3KASMC17HE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC17HE3/9AT 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 3KASMC17HE3/9AT?
For technical support, including 3KASMC17HE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC17HE3/9AT requirements.
6.How does Aetrix verify that 3KASMC17HE3/9AT is sourced from the original manufacturer or authorized distributors?
All 3KASMC17HE3/9AT 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 3KASMC17HE3/9AT meets industry standards.
7.What is the process for return or replacement of 3KASMC17HE3/9AT?
All 3KASMC17HE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC17HE3/9AT, 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 3KASMC17HE3/9AT part is unused and in its original packaging.
Return procedure for 3KASMC17HE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC17HE3/9AT Tags
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