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Vishay General Semiconductor - Diodes Division SMAJ33AHM3_A/I
- Part No.:
- SMAJ33AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33AHM3_A/I.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,173
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Product details
Overview
SMAJ33AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, and clamps to ≤53.3 V at 7.5 A peak pulse current under 10/1000 μs waveform - used for protecting MOSFETs, ICs, and sensor interfaces in automotive and industrial power rails.
For engineers reviewing the SMAJ33AHM3_A/I datasheet, SMAJ33AHM3_A/I pinout, SMAJ33AHM3_A/I application, or SMAJ33AHM3_A/I equivalent, key selection criteria include its 400 W peak pulse power rating (≤78 V), AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, and low thermal resistance (RθJL = 30 °C/W) enabling robust surge handling in space-constrained PCB layouts.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, leveraging a glass-passivated silicon junction for fast response (<1 ps) and stable clamping under repetitive transient events. Its 10/1000 μs waveform rating reflects standardized lightning/surge immunity testing per IEC 61000-4-5.
The device is rated for continuous operation from –55 °C to +150 °C junction temperature, with derated peak pulse power above 25 °C ambient and thermal resistance optimized for solder-pad heatsinking (0.2" × 0.2" copper pads). It meets J-STD-020 MSL Level 1 and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum steady-state reverse voltage before leakage exceeds 1 μA; defines safe operating margin below clamping threshold. |
| VBR (min/max) | 36.7 V / 40.6 V at 1 mA - Confirmed breakdown range ensures reliable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM | ≤53.3 V at 7.5 A - Clamped voltage limits stress on downstream components during 10/1000 μs surges. |
| PPPM | 400 W - Peak pulse power capability supports IEC 61000-4-5 Level 4 (4 kV) surge protection on 12–24 V systems. |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms) validates robustness against inductive switch-off events. |
| TJ max | +150 °C - Enables use in under-hood automotive environments and high-temperature industrial enclosures. |
| RθJL | 30 °C/W - Low junction-to-lead thermal resistance allows effective heat dissipation through PCB copper traces. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. Cathode indicated by band marking on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to protected line side; conducts during forward-biased surge conditions only in specific configurations. |
| Cathode | Clamping node / reference terminal | Connected to ground or lower-potential rail; defines clamping voltage reference and carries full surge current to GND. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive powertrain and body electronics per stress test requirements including HTOL, TCT, and ESD. |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive environmental standards and enables use in green manufacturing without compromising surge performance. |
| 400 W peak pulse power (10/1000 μs) | Supports EN 61000-4-5 compliance for 4 kV surge immunity on 24 V DC supply lines without external heatsinking. |
| Low RθJL = 30 °C/W | Enables efficient thermal transfer to PCB copper, reducing risk of thermal runaway during repeated transient events. |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under humidity and temperature cycling stress. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12 V battery-supplied ECUs exposed to load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC-DC converter input stage. Use Value: Limits transients to ≤53.3 V, preventing damage to 36 V-rated input capacitors and LDO regulators. |
Use Scenario: 4–20 mA current-loop sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: TVS mounted across sensor input terminals to suppress EFT bursts and cable-coupled noise. Use Value: Clamps induced surges within 1 ps, preserving analog front-end accuracy and avoiding ADC saturation. |
| Consumer Power Adapter Input Stage | MOSFET Gate Driver Protection |
|
Use Scenario: Secondary-side 5–24 V output rails in USB-C PD adapters subject to hot-plug and capacitor discharge transients. IC Role / Device Role / Timing Role: TVS placed between output rail and ground to absorb reverse-energy spikes from inductive loads. Use Value: Withstands 40 A surge current (IFSM), protecting synchronous rectifier FETs and output capacitors. |
Use Scenario: High-side N-channel MOSFET gate drivers in motor control inverters. IC Role / Device Role / Timing Role: TVS connected between gate and source to clamp Miller-induced voltage spikes during switching transitions. Use Value: Fast response and low clamping voltage (53.3 V) prevent gate oxide breakdown while maintaining driver timing integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33AHE3_A/I | Same electrical specs but RoHS-compliant commercial grade (E3), not halogen-free or AEC-Q101 qualified. | Lacks automotive qualification and halogen-free certification; suitable for consumer/industrial non-automotive use. | Select when AEC-Q101 and halogen-free requirements are not mandated, prioritizing cost-sensitive volume production. |
| SMBJ33A-HM3_A/I | Higher 600 W peak pulse power (10/1000 μs), same VWM/VC, but larger SMB (DO-214AA) package. | Requires larger PCB footprint; better suited for higher-energy surge environments like telecom power feeds. | Choose when system-level surge testing exceeds 400 W requirements and board area permits SMB footprint. |
Compared with SMAJ33AHM3_A/I, SMAJ33AHE3_A/I offers identical clamping performance without automotive qualification, while SMBJ33A-HM3_A/I delivers 50 % higher surge energy handling in a larger package - enabling trade-offs between footprint, qualification, and robustness.
Availability
SMAJ33AHM3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, and consumer power adapter designs requiring stable component supply with AEC-Q101 validation and halogen-free compliance.
Supply support for SMAJ33AHM3_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 automotive-grade qualification.
The SMAJ series targets high-reliability transient suppression in space-constrained applications, with design focus on fast clamping, low leakage, and robust surge endurance for automotive and industrial power systems.
FAQ
What is the maximum clamping voltage of the SMAJ33AHM3_A/I under standard surge conditions?
The SMAJ33AHM3_A/I clamps to a maximum of 53.3 V at 7.5 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured per JEDEC test conditions and ensures downstream components see limited overvoltage during transient events. The SMAJ33AHM3_A/I maintains this clamping performance across its full operating temperature range (–55 °C to +150 °C).
Is the SMAJ33AHM3_A/I suitable for automotive applications?
Yes, the SMAJ33AHM3_A/I is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials - meeting critical requirements for automotive body electronics, infotainment power supplies, and ADAS sensor interfaces. Its 40 A IFSM rating and 150 °C TJ max support under-hood deployment where thermal and surge stresses are elevated. The SMAJ33AHM3_A/I is explicitly designated for automotive use via its HM3 suffix.
How does the SMAJ33AHM3_A/I differ from the SMAJ33AHE3_A/I variant?
The SMAJ33AHM3_A/I and SMAJ33AHE3_A/I share identical electrical parameters (VWM, VBR, VC, PPPM) but differ in qualification and material content: HM3 denotes halogen-free + AEC-Q101 qualification, whereas HE3 indicates RoHS-compliant + AEC-Q101 but not halogen-free. The SMAJ33AHM3_A/I is required for automotive programs mandating both qualifications and green material compliance, while SMAJ33AHE3_A/I serves cost-sensitive non-halogen-restricted automotive designs.
What is the thermal resistance profile of the SMAJ33AHM3_A/I?
The SMAJ33AHM3_A/I has a typical junction-to-lead thermal resistance (RθJL) of 30 °C/W and junction-to-ambient (RθJA) of 120 °C/W when mounted on minimum recommended pad layout. This low RθJL enables efficient heat transfer to PCB copper, supporting sustained surge handling without thermal runaway. The SMAJ33AHM3_A/I achieves this via optimized leadframe design and glass-passivated die attachment, validated per JESD51-14.
Can the SMAJ33AHM3_A/I be used in bidirectional configurations?
No, the SMAJ33AHM3_A/I is a unidirectional TVS diode, identified by its cathode band marking and specified electrical characteristics for single-polarity clamping. Bidirectional operation requires a CA-suffixed part (e.g., SMAJ33CA). Using SMAJ33AHM3_A/I in reverse-biased configurations risks permanent breakdown due to lack of symmetric reverse conduction capability. Always verify polarity alignment during PCB layout - the SMAJ33AHM3_A/I must be oriented with cathode toward the protected circuit's ground reference.
SMAJ33AHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 7.5A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ33AHM3_A/I FAQ
1.How can I place an order for SMAJ33AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33AHM3_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 SMAJ33AHM3_A/I reliable?
The price and inventory of SMAJ33AHM3_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 SMAJ33AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ33AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33AHM3_A/I?
SMAJ33AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33AHM3_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 SMAJ33AHM3_A/I?
For technical support, including SMAJ33AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33AHM3_A/I requirements.
6.How does Aetrix verify that SMAJ33AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ33AHM3_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 SMAJ33AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ33AHM3_A/I?
All SMAJ33AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33AHM3_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 SMAJ33AHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ33AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ33AHM3_A/I Tags
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