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Vishay General Semiconductor - Diodes Division 3KASMC33AHM3_A/H
- Part No.:
- 3KASMC33AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC33AHM3_A/H.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,712
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Product details
Overview
3KASMC33AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor (TVS) designed for high-reliability protection of sensitive electronics against inductive switching transients and lightning-induced surges. It delivers 3000 W peak pulse power (10/1000 μs), clamps at 53.3 V under 56.3 A surge current, and operates up to 185 °C junction temperature - making it suitable for automotive powertrain control units, industrial motor drives, and automotive sensor signal lines.
For engineers reviewing the 3KASMC33AHM3_A/H datasheet, 3KASMC33AHM3_A/H pinout, 3KASMC33AHM3_A/H application, or 3KASMC33AHM3_A/H equivalent, key selection criteria include its 33 V stand-off voltage, AEC-Q101 qualification, DO-214AB (SMC) package thermal performance, and uni-directional clamping behavior in DC-biased protection circuits.
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 MSL Level 1 rating support reflow soldering at 260 °C peak, enabling use in under-hood automotive modules and high-ambient industrial environments.
The device exhibits fast response time and excellent clamping capability with 53.3 V maximum clamping voltage at 56.3 A IPPM, ensuring robust protection for 3.3 V–24 V logic interfaces and MOSFET gate drivers without excessive overvoltage stress during transient events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 33 V - Maximum continuous reverse voltage before clamping begins; sets operating margin for 24 V automotive systems. |
| Breakdown Voltage (VBR) | 36.7–40.6 V at 1 mA - Confirms reliable turn-on threshold above VWM with controlled tolerance band. |
| Peak Pulse Power (PPPM) | 3000 W (10/1000 μs) - Sustains high-energy transients common in automotive load-dump and ISO 7637-2 pulse 5a. |
| Clamping Voltage (VC) | 53.3 V at 56.3 A - Limits downstream voltage stress on protected ICs such as CAN transceivers or microcontrollers. |
| Peak Surge Current (IPPM) | 56.3 A - Quantifies maximum single-pulse current handling capacity under standardized waveform conditions. |
| Junction Temperature (TJ max) | 185 °C - Enables operation in engine control units and power inverters where ambient exceeds 125 °C. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standard. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, RoHS-compliant, MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to ground or low-side reference in uni-directional TVS configuration. | Provides low-impedance path to ground during transient overvoltage events on cathode-connected line. |
| Cathode | Current exit terminal in forward bias; marked by color band; connected to protected signal or power line. | Accepts transient energy from protected node and routes it to anode/ground when voltage exceeds VBR. |
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 max = 185 °C enables placement near heat sources in automotive ECUs without derating penalties. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time), improving clamping fidelity. |
| MSL Level 1 compliance | Supports standard lead-free reflow profiles up to 260 °C without popcorn cracking or delamination. |
| Uni-directional polarity only | Simplifies layout for DC-biased rails (e.g., 12 V battery lines) while avoiding reverse leakage issues in AC-coupled paths. |
Applications
| Automotive Power Distribution | Industrial Motor Drive Control |
|---|---|
Use Scenario: Protection of 12 V/24 V supply inputs in body control modules against load dump and alternator transients. IC Role / Device Role / Timing Role: Uni-directional TVS clamp placed between battery rail and input filter capacitor. Use Value: Withstands 3000 W pulses and clamps at 53.3 V, preventing damage to downstream PMICs and microcontrollers during ISO 7637-2 pulse 5a events. |
Use Scenario: Guarding gate driver signal lines in IGBT-based variable-frequency drives exposed to switching noise. IC Role / Device Role / Timing Role: Fast-response TVS placed across isolated gate drive transformer secondary outputs. Use Value: Sub-1 ns response time and 53.3 V clamping limit overvoltage spikes that could falsely trigger IGBTs or damage level-shifters. |
| Automotive Sensor Signal Lines | Telecom Power Interface |
Use Scenario: Protecting LIN/CAN bus physical layer receivers from ESD and cable discharge events in ADAS camera modules. IC Role / Device Role / Timing Role: Low-capacitance TVS connected between signal line and chassis ground near connector entry point. Use Value: 53.3 V clamping ensures receiver ICs remain within absolute maximum ratings while maintaining signal integrity up to 1 Mbps. |
Use Scenario: Safeguarding 48 V DC power inputs in PoE-powered network switches against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-stage TVS mounted at board edge before DC-DC converter input stage. Use Value: 3000 W peak power rating handles IEC 61000-4-5 combination wave (10/700 μs) surges up to 4 kV without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/57T (Vishay) | Lower PPPM (400 W), same DO-214AC (SMA) package, 33 V VWM, but rated only to 150 °C TJ max. | Not AEC-Q101 qualified; suitable for commercial/industrial, not automotive under-hood use. | Select when cost sensitivity outweighs automotive qualification and higher surge immunity requirements. |
| 1.5KE33A (ON Semiconductor) | Through-hole DO-201AE package, 1500 W PPPM, 33 V VWM, 53.3 V VC, rated to 175 °C TJ max. | Larger footprint and manual assembly required; unsuitable for high-density SMT production. | Choose only if legacy through-hole design mandates compatibility or thermal mass benefits outweigh SMT efficiency. |
Compared with SMAJ33A-E3/57T and 1.5KE33A, the 3KASMC33AHM3_A/H provides superior surge robustness (3000 W vs. 400 W/1500 W), automotive qualification, and high-temperature capability - critical for next-generation vehicle electrification and compact industrial power systems.
Availability
3KASMC33AHM3_A/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial motor drive control, automotive sensor signal lines, and telecom power interface applications requiring stable component supply and full AEC-Q101 traceability.
Supply support for 3KASMC33AHM3_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, TVS devices, and optoelectronics with emphasis on reliability, power efficiency, and automotive-grade validation.
The 3KASMC series belongs to Vishay's PAR® family of high-power TVS diodes engineered specifically for harsh-environment transient suppression in automotive, industrial, and telecom infrastructure - prioritizing thermal resilience and AEC-Q101 compliance.
FAQ
What is the maximum clamping voltage of the 3KASMC33AHM3_A/H under rated surge conditions?
The 3KASMC33AHM3_A/H has a maximum clamping voltage (VC) of 53.3 V at 56.3 A peak pulse current (IPPM) using the 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 standards and ensures predictable overvoltage limiting for protected circuitry. The 3KASMC33AHM3_A/H maintains this clamping performance across its full operating temperature range up to 185 °C junction temperature.
Is the 3KASMC33AHM3_A/H suitable for automotive under-hood applications?
Yes, the 3KASMC33AHM3_A/H is AEC-Q101 qualified and rated for 185 °C maximum junction temperature, making it suitable for under-hood automotive applications such as engine control units, transmission control modules, and battery management systems. Its DO-214AB (SMC) package supports MSL Level 1 reflow and withstands thermal cycling and humidity exposure typical in automotive environments. The 3KASMC33AHM3_A/H meets all stress test requirements defined in the AEC-Q101 standard.
What does the "HM3_A/H" suffix indicate in the 3KASMC33AHM3_A/H part number?
The "HM3" denotes the RoHS-compliant, AEC-Q101-qualified DO-214AB (SMC) package variant; "_A" indicates revision level A; "/H" specifies packaging in 7-inch plastic tape and reel with 850 units per reel. This ordering code aligns with Vishay's standard nomenclature for automotive-grade TVS diodes and ensures traceability to material composition, qualification status, and delivery format. The 3KASMC33AHM3_A/H is fully compliant with JESD201 Class 2 whisker testing and UL 94 V-0 molding compound requirements.
How does the 3KASMC33AHM3_A/H compare to bi-directional TVS diodes in protection design?
The 3KASMC33AHM3_A/H is uni-directional only, intended for DC-biased lines like 12 V or 24 V power rails where reverse conduction is not required. Unlike bi-directional variants, it avoids leakage current in reverse bias and offers tighter VBR tolerance. For AC or floating signal lines (e.g., RS-485), a bi-directional TVS would be necessary - but the 3KASMC33AHM3_A/H delivers superior clamping precision and lower capacitance in properly biased DC applications.
What thermal resistance values apply to the 3KASMC33AHM3_A/H in PCB layout planning?
The 3KASMC33AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 77.5 °C/W and junction-to-leads resistance (RθJL) of 18.3 °C/W, measured on minimum recommended pad layout per Vishay specification. These values guide copper pour sizing and thermal via placement to maintain safe junction temperatures during sustained surge events or elevated ambient conditions. Layout adherence to Vishay's DO-214AB mounting recommendations is essential to achieve the 3KASMC33AHM3_A/H's rated 185 °C TJ max.
3KASMC33AHM3_A/H 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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 56.3A
- 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)
3KASMC33AHM3_A/H FAQ
1.How can I place an order for 3KASMC33AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC33AHM3_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 3KASMC33AHM3_A/H reliable?
The price and inventory of 3KASMC33AHM3_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 3KASMC33AHM3_A/H is usually 5 days.
3.What payment methods are accepted for 3KASMC33AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC33AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC33AHM3_A/H?
3KASMC33AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC33AHM3_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 3KASMC33AHM3_A/H?
For technical support, including 3KASMC33AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC33AHM3_A/H requirements.
6.How does Aetrix verify that 3KASMC33AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC33AHM3_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 3KASMC33AHM3_A/H meets industry standards.
7.What is the process for return or replacement of 3KASMC33AHM3_A/H?
All 3KASMC33AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC33AHM3_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 3KASMC33AHM3_A/H part is unused and in its original packaging.
Return procedure for 3KASMC33AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC33AHM3_A/H Tags
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