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Vishay General Semiconductor - Diodes Division SMAJ33CA-M3/5A
- Part No.:
- SMAJ33CA-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33CA-M3/5A.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,352
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Product details
Overview
SMAJ33CA-M3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection on signal and power lines. It features a 33 V standoff voltage (VWM), 53.3 V maximum clamping voltage (VC) at 7.5 A peak pulse current, and 400 W peak pulse power rating with a 10/1000 μs waveform - optimized for protecting MOSFETs, ICs, and sensor interfaces in automotive and industrial environments.
For engineers reviewing the SMAJ33CA-M3/5A datasheet, SMAJ33CA-M3/5A pinout, SMAJ33CA-M3/5A application, or SMAJ33CA-M3/5A equivalent, key selection criteria include bidirectional clamping symmetry, low leakage (<1.0 μA at 33 V), MSL Level 1 moisture sensitivity, halogen-free RoHS compliance, and AEC-Q101 qualification readiness via HM3 suffix variants.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ), but triggers into low-impedance conduction when transient voltage exceeds its 36.7–40.6 V breakdown range (VBR at 1 mA). Its glass-passivated junction ensures stable avalanche characteristics and fast response time (<1.0 ns).
The device uses symmetrical bidirectional architecture - no polarity marking - enabling identical clamping performance in both directions. Thermal design relies on RθJA = 120 °C/W (on 5.0 mm × 5.0 mm copper pads), with maximum junction temperature rated to +150 °C and surge capability derated above 25 °C per Fig. 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before leakage exceeds 1.0 μA; defines safe working margin below clamping threshold. |
| VBR (min/max) | 36.7 V / 40.6 V at 1 mA - Confirmed breakdown range ensuring reliable triggering without premature conduction during normal operation. |
| VC @ IPPM | 53.3 V at 7.5 A - Clamping voltage limits downstream component stress during 10/1000 μs transients; critical for IC-level ESD/lightning surge protection. |
| PPPM | 400 W - Peak pulse power handling capacity with 0.01% duty cycle; supports repetitive surge events in motor drive or relay-switching applications. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against inrush or fault currents in unidirectional configurations. |
| TJ max | +150 °C - Maximum junction temperature enabling use in under-hood automotive or high-ambient industrial enclosures without thermal shutdown. |
| Package | SMA (DO-214AC) - Surface-mount package with 5.28 mm × 4.50 mm footprint, compatible with automated placement and reflow soldering (260 °C peak). |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; bidirectional configuration has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Both terminals function identically in bidirectional mode; current flows from either terminal to the other during overvoltage events - no PCB orientation dependency. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both polarities - eliminates need for polarity-aware layout on differential or AC-coupled lines like CAN, RS-485, or sensor bridges. |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV line-earth) when mounted on recommended 5.0 mm × 5.0 mm copper pads - validated for industrial EMC compliance. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes voltage overshoot during transients - protects 3.3 V and 5 V logic rails without requiring additional series impedance or buffering. |
| Halogen-free & RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and JESD201 Class 2 whisker resistance - suitable for green manufacturing and export-controlled programs. |
| MSL Level 1 rating | Unlimited floor life at ≤30 °C/60% RH - enables direct placement from dry pack without baking, reducing SMT line downtime and moisture-related defects. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of engine coolant temperature sensors exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt clamping element placed directly at connector interface to divert >100 V transients before reaching ADC front-end. Use Value: Maintains signal integrity under 12 V system faults while surviving repeated 400 W surges - validated per AEC-Q101 test conditions when used with HM3 variant. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers subjected to relay coil flyback and field wiring ESD. IC Role / Device Role / Timing Role: Fast-response voltage clamp across input terminals to limit transient voltage to <55 V during 10/1000 μs surges. Use Value: Enables direct connection to field wiring without external series resistors or RC filters - reduces BOM count and board space by 30% vs. discrete Zener+capacitor solutions. |
| Telecom Line Interface | Consumer Power Adapter Output |
|
Use Scenario: Overvoltage suppression on RS-485 bus lines in base station remote units exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional clamping device placed between differential pair and transceiver IC to equalize voltage excursion on both lines. Use Value: Prevents latch-up in SN65HVD7x-series transceivers by limiting common-mode surge to <53.3 V - meets ITU-T K.21 Basic Protection Level. |
Use Scenario: Secondary-side transient protection on 5 V/9 V USB-C PD adapter outputs prone to hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Final-stage clamp after DC-DC converter to absorb sub-microsecond ESD bursts before reaching connected devices. Use Value: Achieves <1.0 μA leakage at 33 V standby - avoids battery drain in always-on USB accessories while clamping to 53.3 V during 8 kV contact discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA-E3/5A | Same electrical specs; RoHS-compliant but contains brominated flame retardants (non-halogen-free). | Acceptable for commercial-grade consumer electronics where halogen-free mandate does not apply. | Select E3 if cost sensitivity outweighs halogen-free requirement and AEC-Q101 is not needed. |
| SMAJ33CAHM3_A/I | Identical SMA package and clamping parameters; qualified to AEC-Q101 with extended temperature validation (-55 °C to +150 °C). | Required for automotive powertrain and chassis modules needing certified reliability data and failure rate reporting. | Choose HM3_A/I for production automotive programs requiring PPAP documentation and zero-defect field performance. |
Compared with SMAJ33CA-M3/5A, the E3 variant offers lower unit cost but lacks halogen-free certification, while the HM3_A/I adds AEC-Q101 qualification at higher procurement complexity - M3 strikes optimal balance for industrial and Tier-2 automotive applications demanding green compliance without full automotive certification overhead.
Availability
SMAJ33CA-M3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer power adapter designs requiring stable component supply, halogen-free compliance, and repeatable surge performance.
Supply support for SMAJ33CA-M3/5A 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, MOSFETs, and protection devices with emphasis on high-reliability, high-efficiency, and application-specific optimization.
The SMAJ series was engineered specifically for surface-mount transient suppression in space-constrained, high-surge environments - targeting automotive, industrial automation, and communications infrastructure where consistent clamping and long-term stability are non-negotiable.
FAQ
What is the clamping voltage of SMAJ33CA-M3/5A at its rated peak pulse current?
The SMAJ33CA-M3/5A exhibits a maximum clamping voltage (VC) of 53.3 V when subjected to its rated peak pulse current of 7.5 A using the standard 10/1000 μs waveform. This value is measured under defined test conditions per ANSI/IEEE C62.35 and represents the upper voltage limit imposed on protected circuitry during surge events - a critical parameter for ensuring downstream ICs remain within absolute maximum ratings.
Is SMAJ33CA-M3/5A suitable for automotive applications?
SMAJ33CA-M3/5A is halogen-free and RoHS-compliant, but not AEC-Q101 qualified in this specific M3/5A configuration. For automotive use, Vishay offers the SMAJ33CAHM3_A/I variant, which shares identical electrical and mechanical specs but includes full AEC-Q101 qualification. Engineers deploying SMAJ33CA-M3/5A in automotive contexts must validate reliability independently, whereas SMAJ33CAHM3_A/I provides certified test reports for temperature cycling, HTRB, and ESD.
How does the bidirectional design of SMAJ33CA-M3/5A affect PCB layout?
The bidirectional nature of SMAJ33CA-M3/5A eliminates polarity constraints - there is no cathode band or marking, and either terminal functions identically. This allows symmetric placement across differential signals (e.g., RS-485, CAN) or AC-coupled paths without orientation checks during assembly. Layout requires only standard SMA pad dimensions (0.208" × 0.177") and 5.0 mm × 5.0 mm copper thermal pads per terminal to sustain 400 W pulse ratings.
What is the maximum leakage current of SMAJ33CA-M3/5A at its standoff voltage?
At its 33 V standoff voltage (VWM), the SMAJ33CA-M3/5A guarantees a maximum reverse leakage current (ID) of 1.0 μA at 25 °C. This ultra-low leakage preserves power efficiency in always-on circuits such as battery-backed sensors or USB-C port detection logic, and remains stable across its -55 °C to +150 °C operating junction temperature range per datasheet characterization.
Can SMAJ33CA-M3/5A be used in place of a unidirectional TVS like SMAJ33A-M3/5A?
No - SMAJ33CA-M3/5A is strictly bidirectional and cannot replace unidirectional types like SMAJ33A-M3/5A in DC-biased applications requiring cathode-anode polarity control. Attempting substitution risks improper clamping during positive transients on grounded lines or unintended conduction in forward-biased configurations. The "CA" suffix explicitly denotes symmetrical bidirectional behavior, confirmed by identical VBR min/max values in both directions and absence of polarity marking.
SMAJ33CA-M3/5A 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-M3/5A FAQ
1.How can I place an order for SMAJ33CA-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33CA-M3/5A 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-M3/5A reliable?
The price and inventory of SMAJ33CA-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ33CA-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ33CA-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33CA-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33CA-M3/5A?
SMAJ33CA-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33CA-M3/5A 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-M3/5A?
For technical support, including SMAJ33CA-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33CA-M3/5A requirements.
6.How does Aetrix verify that SMAJ33CA-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ33CA-M3/5A 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-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ33CA-M3/5A?
All SMAJ33CA-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33CA-M3/5A, 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-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ33CA-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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