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Vishay General Semiconductor - Diodes Division SMA5J33-E3/5A
- Part No.:
- SMA5J33-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J33-E3/5A.pdf
- Description:
- TVS DIODE 33VWM 59VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,134
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Product details
Overview
SMA5J33-E3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor diode in DO-214AC (SMA) package, designed for high-energy surge protection on DC power rails and signal lines. It features a 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR), 500 W peak pulse power (10/1000 µs), 9.4 A peak pulse current (IPPM), and clamps to ≤53.3 V at rated surge. It is widely used to protect MOSFETs and ICs in automotive power supplies.
For engineers reviewing the SMA5J33-E3/5A datasheet, SMA5J33-E3/5A pinout, SMA5J33-E3/5A application, or SMA5J33-E3/5A equivalent, key selection criteria include unidirectional polarity, 500 W surge rating, DO-214AC thermal performance (RθJA = 80 °C/W), AEC-Q101 qualification status, and RoHS-compliant E3 termination.
Technical Context
This device operates as a silicon avalanche diode with glass-passivated junction, delivering fast response (<1 ns) and low incremental surge resistance to clamp transients before downstream components are damaged. Its unidirectional configuration enables integration into DC-biased circuits where reverse conduction must be blocked during normal operation.
The SMA5J33-E3/5A is rated for 150 °C maximum junction temperature and meets J-STD-020 MSL Level 1 (260 °C reflow peak). It is qualified to AEC-Q101 for automotive under-hood applications and exhibits <1 µA reverse leakage at 33 V (VWM) - critical for low-power sensor rail protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 36.7 V / 40.6 V at 1 mA - Ensures reliable avalanche initiation within defined tolerance band |
| VC @ IPPM | ≤53.3 V at 9.4 A - Clamping voltage limits stress on protected ICs during 10/1000 µs surge |
| PPPM | 500 W - Sustains high-energy transients common in automotive load-dump and inductive switching |
| IFSM | 40 A - Withstands 8.3 ms half-sine surge without degradation, supporting robust power rail protection |
| TJ max | 150 °C - Enables operation in under-hood environments with minimal derating |
| RθJA | 80 °C/W - Defines thermal rise per watt dissipated on standard 5 mm × 5 mm copper pads |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential node in unidirectional TVS configuration |
| Cathode (banded end) | Avalanche clamping terminal | Connected to protected line; conducts during overvoltage to shunt energy to ground |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable breakdown characteristics and long-term reliability under repeated surge stress |
| AEC-Q101 qualification | Validates suitability for automotive powertrain and body electronics with extended temperature cycling |
| MSL Level 1 rating | Supports standard SMT reflow without moisture-induced damage (peak 260 °C) |
| RoHS-compliant E3 termination | Meets JESD201 Class 1A whisker resistance for high-reliability industrial and automotive assembly |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a) |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump (ISO 16750-2) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp surges above 33 V. Use Value: Limits transient voltage to ≤53.3 V, preventing latch-up or gate oxide damage in MCU and power management ICs. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) connected to ADC inputs in factory automation. IC Role / Device Role / Timing Role: TVS mounted across differential or single-ended signal lines to absorb ESD and cable discharge events. Use Value: Sub-µA leakage at 33 V avoids signal offset errors; fast response preserves signal integrity during 8 kV contact ESD (IEC 61000-4-2). |
| DC-DC Converter Input Protection | MOSFET Gate Driver Protection |
Use Scenario: Shielding buck converter inputs from inductive kickback when driving solenoids or relays in HVAC control modules. IC Role / Device Role / Timing Role: Placed upstream of input capacitors to divert surge energy before it reaches controller ICs. Use Value: 500 W rating handles repetitive 10/1000 µs pulses; DO-214AC footprint allows compact layout near connector entry points. | Use Scenario: Preventing gate oxide failure in high-side N-channel MOSFET drivers exposed to flyback voltages. IC Role / Device Role / Timing Role: Connected between gate and source to clamp negative-going spikes during switching transitions. Use Value: 33 V VWM aligns with typical gate drive supply rails; 9.4 A IPPM absorbs localized energy without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J33AHE3/5A | AEC-Q101 qualified variant with identical electrical specs and DO-214AC package | Required for automotive safety-critical modules requiring full AEC-Q101 documentation traceability | Select SMA5J33AHE3/5A when formal automotive qualification evidence (test reports, PPAP) is mandated |
| SMC5J33A-E3/57T | Same VWM/VBR/PPPM, but in larger DO-214AB (SMC) package with higher IPPM (12.3 A) and lower RθJA (50 °C/W) | Better suited for high-temperature ambient (>105 °C) or higher-repetition surge environments | Choose SMC5J33A-E3/57T when thermal margin is constrained or surge duty cycle exceeds 1 Hz |
Compared with SMA5J33-E3/5A, SMA5J33AHE3/5A adds formal AEC-Q101 certification without electrical change, while SMC5J33A-E3/57T trades footprint size for superior thermal handling and surge current capacity - both require PCB layout revision.
Availability
SMA5J33-E3/5A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and DC-DC converter input surge suppression requiring stable component supply and long-term lifecycle support.
Supply support for SMA5J33-E3/5A 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, and transient protection devices with emphasis on reliability and automotive-grade qualification.
The SMA5J series was engineered specifically for high-power-density surface-mount transient suppression in space-constrained automotive and industrial systems, balancing surge capability, thermal performance, and manufacturability.
FAQ
What is the polarity configuration of the SMA5J33-E3/5A?
The SMA5J33-E3/5A is a unidirectional transient voltage suppressor diode. Its cathode is marked by a band on the DO-214AC package body, and it conducts only in reverse bias during overvoltage events. This configuration blocks reverse current during normal operation - essential for protecting DC-powered circuits where polarity must be preserved. The SMA5J33-E3/5A does not conduct in forward direction beyond its specified forward voltage drop.
Does the SMA5J33-E3/5A meet automotive qualification standards?
The SMA5J33-E3/5A is RoHS-compliant and manufactured to Vishay's commercial-grade specifications. While it shares the same die and package as the AEC-Q101-qualified SMA5J33AHE3/5A, the SMA5J33-E3/5A itself is not AEC-Q101 certified. For automotive applications requiring formal qualification, engineers should specify SMA5J33AHE3/5A instead - the SMA5J33-E3/5A remains suitable for non-safety-critical industrial and consumer designs.
What is the maximum clamping voltage of the SMA5J33-E3/5A at rated surge current?
The SMA5J33-E3/5A clamps to a maximum of 53.3 V when subjected to its rated 10/1000 µs peak pulse current of 9.4 A. This value is measured under standardized test conditions (TA = 25 °C, mounted on 5 mm × 5 mm copper pads) and defines the upper voltage limit imposed on protected circuitry during surge events. Designers use this parameter to verify that downstream components remain within their absolute maximum ratings.
How does the thermal resistance of the SMA5J33-E3/5A affect its surge handling capability?
The SMA5J33-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W when mounted on standard 5 mm × 5 mm copper pads. This value directly impacts its ability to dissipate heat after repeated surges: higher ambient temperatures or reduced copper area increase junction temperature, requiring derating of peak pulse power per Vishay's Fig. 2 curve. For sustained surge duty, thermal design must ensure TJ stays below 150 °C - the SMA5J33-E3/5A's maximum rated junction temperature.
Can the SMA5J33-E3/5A be used in bi-directional protection applications?
No - the SMA5J33-E3/5A is strictly unidirectional and lacks symmetrical breakdown behavior. Bi-directional protection requires a part with "CA" suffix (e.g., SMA5J33CA), which exhibits matched avalanche characteristics in both polarities. Using SMA5J33-E3/5A in AC or floating signal paths risks failure during positive half-cycles, as it will conduct and potentially fail under forward bias beyond its 3.5 V @ 25 A forward voltage rating. Always match polarity type to system architecture.
SMA5J33-E3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 59V
- Current - Peak Pulse (10/1000µs):
- 8.5A
- Power - Peak Pulse:
- 500W
- 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)
SMA5J33-E3/5A FAQ
1.How can I place an order for SMA5J33-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J33-E3/5A 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 SMA5J33-E3/5A reliable?
The price and inventory of SMA5J33-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J33-E3/5A is usually 5 days.
3.What payment methods are accepted for SMA5J33-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J33-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J33-E3/5A?
SMA5J33-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J33-E3/5A 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 SMA5J33-E3/5A?
For technical support, including SMA5J33-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J33-E3/5A requirements.
6.How does Aetrix verify that SMA5J33-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMA5J33-E3/5A 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 SMA5J33-E3/5A meets industry standards.
7.What is the process for return or replacement of SMA5J33-E3/5A?
All SMA5J33-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J33-E3/5A, 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 SMA5J33-E3/5A part is unused and in its original packaging.
Return procedure for SMA5J33-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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