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Vishay General Semiconductor - Diodes Division SMAJ33AHE3/61
- Part No.:
- SMAJ33AHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33AHE3/61.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,909
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Product details
Overview
SMAJ33AHE3/61 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 53.3 V maximum clamping voltage (VC) at 7.5 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), commonly deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMAJ33AHE3/61 datasheet, SMAJ33AHE3/61 pinout, SMAJ33AHE3/61 application, or SMAJ33AHE3/61 equivalent, key selection criteria include clamping performance under 7.5 A surge, thermal resistance (RθJA = 120 °C/W), AEC-Q101 qualification status, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This unidirectional TVS diode operates by avalanche breakdown to clamp transient overvoltages above its VWM of 33 V, limiting downstream circuit voltage to ≤53.3 V during a 10/1000 μs surge event. Its glass-passivated junction ensures stable leakage (<1 μA at VWM) and fast response time (<1 ns), critical for protecting sensitive MOSFET gates and microcontroller I/O pins.
The device is rated for 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), supports operating junction temperatures from –55 °C to +150 °C, and meets MSL Level 1 per J-STD-020 with peak reflow temperature up to 260 °C - confirming suitability for high-reliability automotive PCB assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - defines reliable avalanche turn-on threshold range |
| VC @ IPPM | 53.3 V at 7.5 A - peak clamped voltage during standardized 10/1000 μs surge |
| PPPM | 400 W (≤78 V) - surge energy handling capability without failure |
| ID @ VWM | <1 μA - ultra-low leakage preserves battery life and signal integrity |
| RθJA | 120 °C/W - thermal resistance dictates derating above 25 °C ambient |
| AEC-Q101 | Qualified - validated for automotive-grade reliability and stress testing |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when V > VBR |
| Anode (unmarked end) | Reference/return path | Typically tied to system ground or lower-potential rail for unidirectional clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, and ESD |
| 400 W peak pulse power | Withstands ISO 7637-2 Pulse 1/2a/3a transients on 12 V systems without degradation |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes voltage overshoot during surge, reducing risk of IC latch-up or gate oxide damage |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow without moisture-induced popcorn failure |
| Glass passivated junction | Ensures long-term stability of VBR and leakage across temperature and humidity cycling |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator switching transients per ISO 16750-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges >33 V. Use Value: Limits voltage to ≤53.3 V during 7.5 A transients, preventing damage to downstream PMICs and microcontrollers. | Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) from ESD and inductive kickback in factory automation. IC Role / Device Role / Timing Role: TVS connected between signal line and local ground to shunt fast transients before reaching ADC input. Use Value: Sub-1 ns response and <1 μA leakage preserve signal accuracy while surviving ±8 kV contact ESD per IEC 61000-4-2. |
| Consumer USB Port ESD Protection | Telecom DC Power Feed Protection |
Use Scenario: Safeguarding USB VBUS lines in portable chargers and docking stations from hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional TVS installed inline on VBUS path to absorb ±15 kV air/±8 kV contact ESD. Use Value: Clamps to 53.3 V within nanoseconds, preventing latch-up in USB controller ICs rated for 5.5 V max. | Use Scenario: Protecting PoE-powered equipment (e.g., IP cameras) from lightning-induced surges on 48 V DC feed lines. IC Role / Device Role / Timing Role: TVS mounted at PD input to clamp common-mode surges before DC-DC converter stage. Use Value: 400 W rating handles multiple 10/1000 μs surges per IEC 61000-4-5 Level 3 (2 kV), ensuring field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33AE3/61 | Same electrical specs but commercial-grade (non-AEC-Q101); RoHS-compliant, no automotive qualification | Lacks automotive stress validation; suitable for consumer/industrial use only | Select SMAJ33AE3/61 if AEC-Q101 is not required and cost optimization is prioritized |
| SMAJ33AHE3/5A | Identical electrical and qualification specs; differs only in packaging - 7500 pcs/reel (13" tape) vs. 1800 pcs/reel (7" tape) | No functional or application difference; same PCB footprint and performance | Select SMAJ33AHE3/5A for high-volume production requiring larger reel quantities |
Compared with SMAJ33AE3/61 and SMAJ33AHE3/5A, the SMAJ33AHE3/61 uniquely combines AEC-Q101 qualification with 7" tape-and-reel packaging - making it optimal for automotive Tier 1 production where both reliability validation and standard SMT line compatibility are mandatory.
Availability
SMAJ33AHE3/61 is available at Aetrix Electronics and suitable for automotive ECU designs, industrial sensor modules, and telecom power interface circuits requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ33AHE3/61 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 and application-specific performance.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ESD, load dump, and lightning surges is mission-critical.
FAQ
What is the clamping voltage of SMAJ33AHE3/61 at its rated peak pulse current?
The SMAJ33AHE3/61 has a maximum clamping voltage (VC) of 53.3 V when subjected to its specified peak pulse current (IPPM) of 7.5 A under a 10/1000 μs waveform. This value is measured per JEDEC standards and guarantees that downstream components see no more than 53.3 V during such transient events - a critical parameter for safeguarding 3.3 V or 5 V logic interfaces connected to the protected line.
Is SMAJ33AHE3/61 qualified for automotive applications?
Yes, SMAJ33AHE3/61 is AEC-Q101 qualified, meaning it has passed rigorous stress tests including high-temperature operating life, temperature cycling, and ESD immunity required for automotive electronic systems. The "HE3" suffix explicitly denotes this qualification, distinguishing it from commercial-grade variants like SMAJ33AE3/61 - making SMAJ33AHE3/61 suitable for engine control units, ADAS sensors, and infotainment power supplies.
What is the standoff voltage (VWM) and why does it matter for SMAJ33AHE3/61?
The standoff voltage (VWM) of SMAJ33AHE3/61 is 33 V - the maximum continuous reverse voltage the device can block without entering avalanche conduction. This value must be higher than the normal operating voltage of the protected circuit (e.g., 12 V or 24 V automotive rails) to prevent leakage or false triggering, yet low enough to ensure clamping occurs before damaging overvoltages develop - striking a balance essential for reliable protection design.
How does the SMA (DO-214AC) package of SMAJ33AHE3/61 impact PCB layout?
The SMA (DO-214AC) package of SMAJ33AHE3/61 requires minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 400 W pulse power dissipation. Its low-profile form factor (max height 2.29 mm) enables compact layouts in space-constrained automotive modules, and the matte tin-plated leads support lead-free reflow without dewetting - but thermal relief traces must avoid compromising pad thermal mass needed for surge energy absorption.
What is the maximum junction temperature rating for SMAJ33AHE3/61?
The SMAJ33AHE3/61 has a maximum junction temperature (TJ max.) of +150 °C, enabling operation in under-hood automotive environments and industrial enclosures with elevated ambient temperatures. This rating, combined with a typical RθJA of 120 °C/W, allows designers to calculate safe power derating curves - for example, at 85 °C ambient, the device must be limited to ~2.7 W continuous dissipation to maintain TJ ≤ 150 °C.
SMAJ33AHE3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ33AHE3/61 FAQ
1.How can I place an order for SMAJ33AHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33AHE3/61 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 SMAJ33AHE3/61 reliable?
The price and inventory of SMAJ33AHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ33AHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ33AHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33AHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33AHE3/61?
SMAJ33AHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33AHE3/61 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 SMAJ33AHE3/61?
For technical support, including SMAJ33AHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33AHE3/61 requirements.
6.How does Aetrix verify that SMAJ33AHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ33AHE3/61 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 SMAJ33AHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ33AHE3/61?
All SMAJ33AHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33AHE3/61, 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 SMAJ33AHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ33AHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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