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Vishay General Semiconductor - Diodes Division SMAJ33CA-M3/61
- Part No.:
- SMAJ33CA-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33CA-M3/61.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,679
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Product details
Overview
SMAJ33CA-M3/61 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features a 33 V stand-off voltage (VWM), 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), making it suitable for protecting MOSFETs and sensor signal lines in industrial control systems.
For engineers reviewing the SMAJ33CA-M3/61 datasheet, SMAJ33CA-M3/61 pinout, SMAJ33CA-M3/61 application, or SMAJ33CA-M3/61 equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM = 1.62), AEC-Q101 qualification eligibility (via HM3 suffix), MSL Level 1 moisture sensitivity, and halogen-free RoHS compliance per base P/N-M3.
Technical Context
This device operates as a voltage-clamping protector with symmetrical breakdown behavior in both directions due to its bidirectional construction. Its glass-passivated junction ensures stable avalanche characteristics, while the low incremental surge resistance enables consistent clamping under repetitive transient events.
The SMAJ33CA-M3/61 delivers 400 W peak pulse power up to 78 V and derates to 300 W above that threshold, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). It supports operating junction temperatures from –55 °C to +150 °C and meets UL 497B recognition for protector classification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse working voltage before clamping initiates |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - Confirmed breakdown voltage range defining avalanche onset tolerance |
| VC @ IPPM | 53.3 V at 7.5 A - Clamped voltage during 10/1000 μs transient, limiting downstream stress |
| PPPM | 400 W - Peak transient energy absorption capacity under standard waveform |
| IFSM | 40 A - Surge current rating for unidirectional devices only; not applicable to SMAJ33CA |
| TJ max | +150 °C - Maximum junction temperature enabling reliable operation in high-ambient environments |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm × 4.50 mm footprint and 2.29 mm height |
Pinout & Package
Package: SMA (DO-214AC), molded case with matte tin-plated leads, MSL Level 1 compliant, UL 94 V-0 rated epoxy.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Bidirectional symmetry means no functional polarity; terminals are interchangeable for transient suppression |
| Cathode | Current exit terminal in forward bias | No marking on bidirectional variants; both terminals behave identically under reverse or forward transients |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 400 W peak pulse power (≤78 V) | Handles common ESD and inductive-switching surges in automotive and industrial interfaces |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes overvoltage exposure to protected ICs compared to higher-ratio suppressors |
| Halogen-free & RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for global electronics manufacturing |
| MSL Level 1, 260 °C reflow compatible | Supports standard SMT assembly without moisture-related popcorning risk |
Applications
| Industrial Sensor Interface Protection | Automotive Body Control Module Inputs |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors exposed to load dump and relay switching noise in factory automation PLCs. IC Role / Device Role / Timing Role: Voltage clamping element placed across signal and ground, responding within <1 ps to limit transient excursions. Use Value: Prevents latch-up or damage to 3.3 V/5 V ADC front-ends by holding excursion below 53.3 V during 400 W surges. |
Use Scenario: Safeguarding LIN bus input pins on door module ECUs subjected to ISO 7637-2 Pulse 1 and Pulse 2a transients. IC Role / Device Role / Timing Role: Bidirectional transient shunt connected between LIN line and chassis ground. Use Value: Maintains signal integrity during 100 V/50 ms pulses by clamping to ≤53.3 V without polarity-dependent installation. |
| USB 2.0 Data Line ESD Protection | DC Power Rail Surge Suppression |
|
Use Scenario: Secondary-level ESD protection on USB D+/D– lines downstream of integrated port protectors in embedded host controllers. IC Role / Device Role / Timing Role: Fast-response TVS placed differential-mode across data pair to suppress ±8 kV contact discharge per IEC 61000-4-2. Use Value: Limits induced voltage swing to <53.3 V, preventing damage to USB PHY transceivers rated for 5.5 V absolute max. |
Use Scenario: Board-level protection of 24 V DC input rails in programmable logic controllers against inductive kickback from solenoid drivers. IC Role / Device Role / Timing Role: Parallel-connected clamping device across rail and return, activated when voltage exceeds 33 V. Use Value: Absorbs 400 W transient energy to prevent overvoltage shutdown or capacitor rupture on 24 V supply networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-M3/61 | Unidirectional variant with cathode band marking; identical VWM, VBR, VC, and PPPM | Requires correct polarity placement; unsuitable for AC or floating lines | Select SMAJ33A-M3/61 only when circuit topology guarantees defined polarity and ground reference. |
| SMBJ33CA-M3 | Same electrical specs but in larger SMB (DO-214AA) package; 600 W PPPM rating | Higher power handling but occupies 30% more PCB area; requires revised pad layout | Choose SMBJ33CA-M3 where system-level surge testing exceeds 400 W or thermal margin is constrained. |
Compared with SMAJ33A-M3/61, the SMAJ33CA-M3/61 eliminates polarity dependency for simplified layout and broader signal-line compatibility; versus SMBJ33CA-M3, it trades 200 W extra pulse power for 35% smaller footprint and lower parasitic inductance-critical for high-frequency transient response.
Availability
SMAJ33CA-M3/61 is available at Aetrix Electronics and suitable for industrial sensor interface protection, automotive body control module inputs, USB 2.0 data line ESD protection, and DC power rail surge suppression requiring stable component supply and halogen-free compliance.
Supply support for SMAJ33CA-M3/61 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, efficiency, and application-specific performance.
The SMAJ series was developed for robust, surface-mount transient suppression in space-constrained industrial and automotive electronics, prioritizing fast response, repeatable clamping, and AEC-Q101 qualification readiness.
FAQ
What does the "CA" suffix indicate in SMAJ33CA-M3/61?
The "CA" suffix in SMAJ33CA-M3/61 denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage suppression in both polarities. Unlike unidirectional variants (e.g., SMAJ33A), SMAJ33CA-M3/61 has no cathode marking and functions identically regardless of voltage polarity-ideal for AC-coupled or floating signal paths where polarity cannot be guaranteed.
Is SMAJ33CA-M3/61 qualified to AEC-Q101?
SMAJ33CA-M3/61 itself is not AEC-Q101 qualified; however, the HM3 suffix variant (e.g., SMAJ33CAHM3_A/H) is explicitly listed as AEC-Q101 qualified in Vishay's ordering information. The M3 suffix indicates halogen-free and RoHS compliance only. For automotive applications requiring qualification, specify the HM3-based part number-not SMAJ33CA-M3/61.
What is the clamping voltage of SMAJ33CA-M3/61 under a 10/1000 μs transient?
The maximum clamping voltage (VC) of SMAJ33CA-M3/61 under a 10/1000 μs waveform is 53.3 V, measured at a peak pulse current (IPPM) of 7.5 A. This value is confirmed in the Electrical Characteristics table of Vishay document 88390 and defines the upper voltage limit imposed on protected circuitry during standardized surge events.
Can SMAJ33CA-M3/61 be used in place of SMAJ33A-M3/61 without layout changes?
Yes-SMAJ33CA-M3/61 shares identical SMA (DO-214AC) package dimensions, pad layout, and soldering profile with SMAJ33A-M3/61. However, because SMAJ33CA-M3/61 is bidirectional and lacks polarity marking, it can replace SMAJ33A-M3/61 in any application where polarity independence is acceptable or beneficial; no PCB redesign is needed.
What is the maximum operating junction temperature for SMAJ33CA-M3/61?
The maximum operating junction temperature (TJmax) for SMAJ33CA-M3/61 is +150 °C, as specified in the Thermal Characteristics section of Vishay document 88390. This rating allows reliable operation in high-ambient environments such as engine compartments or enclosed industrial enclosures, provided thermal design accounts for RθJA = 120 °C/W.
SMAJ33CA-M3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ33CA-M3/61 FAQ
1.How can I place an order for SMAJ33CA-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33CA-M3/61 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 SMAJ33CA-M3/61 reliable?
The price and inventory of SMAJ33CA-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ33CA-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ33CA-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33CA-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33CA-M3/61?
SMAJ33CA-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33CA-M3/61 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 SMAJ33CA-M3/61?
For technical support, including SMAJ33CA-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33CA-M3/61 requirements.
6.How does Aetrix verify that SMAJ33CA-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ33CA-M3/61 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 SMAJ33CA-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ33CA-M3/61?
All SMAJ33CA-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33CA-M3/61, 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 SMAJ33CA-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ33CA-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ33CA-M3/61 Tags
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