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Vishay General Semiconductor - Diodes Division SA33A-E3/54
- Part No.:
- SA33A-E3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA33A-E3/54.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,339
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Product details
Overview
SA33A-E3/54 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode in DO-15 package, designed for circuit protection against ESD and surge transients. It features 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 53.3 V clamping voltage at 9.4 A peak pulse current, 500 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SA33A-E3/54 datasheet, SA33A-E3/54 pinout, SA33A-E3/54 application, or SA33A-E3/54 equivalent, this component serves as a robust, glass-passivated, RoHS-compliant TVS diode for protecting MOSFETs, ICs, and sensor signal lines in automotive, industrial, and telecom systems where fast response (<1 ns), low clamping ratio, and stable junction temperature up to +175 °C are required.
Technical Context
The SA33A-E3/54 operates as a unidirectional avalanche diode with cathode-marked polarity, leveraging a glass-passivated PN junction for stable breakdown behavior and low incremental surge resistance. Its 10/1000 μs waveform rating supports repetitive surge handling at 0.01% duty cycle, and it exhibits a +39 mV/°C temperature coefficient of VBR - enabling predictable voltage drift over temperature.
Designed for placement across power rails or I/O lines, it delivers sub-1 ns response time and clamps transient energy before downstream components experience overstress. The device meets JESD 22-B106 solderability requirements (275 °C, 10 s) and JESD 201 Class 1A whisker resistance, confirming suitability for automated assembly in high-reliability production.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC/AC rail margin |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - guaranteed avalanche initiation range; ensures consistent turn-on across production lots |
| VC @ IPPM | 53.3 V at 9.4 A - clamped voltage during 10/1000 μs surge; determines maximum stress on protected IC input |
| PPPM | 500 W - peak transient power dissipation capability; enables protection against IEC 61000-4-5 Level 4 surges |
| IFSM | 70 A - non-repetitive forward surge current rating; supports inrush or fault-current events without failure |
| TJ max | +175 °C - maximum junction temperature; allows operation in under-hood automotive or high-ambient industrial environments |
| Leakage ID | 1.0 μA at VWM - ultra-low reverse leakage preserves battery life and signal integrity in always-on circuits |
Pinout & Package
SA33A-E3/54 is housed in a DO-15 (DO-204AC) axial-leaded package with matte tin-plated leads. The cathode is marked by a color band on the body; the anode is the unmarked end. Leads comply with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward current entry / surge return path | Connected to ground or lower-potential rail in unidirectional clamp configuration |
| Cathode (banded end) | Avalanche conduction terminal / protected line connection | Connected to the line being protected (e.g., 33 V supply or sensor output); conducts when Vline exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated chip junction | Enables stable, repeatable avalanche characteristics and long-term reliability under thermal cycling |
| 500 W peak pulse power (10/1000 μs) | Supports robust protection against lightning-induced surges and inductive switching transients in 12 V/24 V systems |
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces |
| Low clamping ratio (VC/VBR ≈ 1.36) | Minimizes overvoltage exposure to downstream ICs while maintaining margin above VWM |
| JESD 201 Class 1A whisker resistance | Ensures mechanical stability of tin plating during reflow and long-term storage, preventing dendritic growth failures |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 33 V supply rails in automotive body control modules from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and chassis ground to clamp transients exceeding 33 V. Use Value: Limits peak voltage to ≤53.3 V during 9.4 A surges, preventing damage to 36 V-rated regulators and microcontrollers. | Use Scenario: Safeguarding analog outputs of pressure or temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: TVS connected across sensor output and ground to absorb ESD events and cable discharge pulses. Use Value: Sub-1 ns response and 1 μA leakage preserve signal accuracy while blocking ±8 kV contact ESD per IEC 61000-4-2. |
| Telecom Line Card Surge Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Shielding Ethernet PHY power pins and bias rails in telecom access equipment exposed to induced surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on 33 V auxiliary bias rail to suppress coupled transients from nearby AC lines or relays. Use Value: 500 W rating handles repeated 10/1000 μs surges per GR-1089-CORE, ensuring field reliability over 10+ years. | Use Scenario: Clamping flyback voltage spikes from brushed DC motors in smart home appliances (e.g., vacuum cleaners, blenders). IC Role / Device Role / Timing Role: TVS mounted across motor terminals to divert inductive kickback away from H-bridge MOSFETs. Use Value: 70 A IFSM withstands repeated motor stall currents; DO-15 package fits compact PCB layouts near motor connectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/57 | Same VWM (33 V), but SMA package (surface-mount); 400 W PPPM; slightly higher VC (53.3 V same, but lower IPPM = 7.5 A) | Requires PCB redesign for SMD layout; better for high-density boards but less suitable for through-hole motor terminals | Select SMAJ33A-E3/57 only when space-constrained layouts demand surface-mount packaging and peak current demands are ≤7.5 A |
| P6SMB33A | Same DO-15 package and VWM; identical VBR/VC specs; 600 W PPPM; higher IFSM (100 A); not AEC-Q101 qualified | Offers higher surge margin but lacks automotive qualification; suitable for industrial-only deployments | Choose P6SMB33A for cost-sensitive industrial designs where AEC-Q101 is not mandated and 600 W headroom is beneficial |
Compared with SMAJ33A-E3/57 and P6SMB33A, the SA33A-E3/54 uniquely combines AEC-Q101 qualification, DO-15 through-hole robustness, and precise 500 W/9.4 A surge handling - making it optimal for automotive and mixed-signal industrial systems requiring proven reliability and legacy-compatible assembly.
Availability
SA33A-E3/54 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, telecom line cards, and consumer appliance motor drives requiring stable component supply across extended product lifecycles.
Supply support for SA33A-E3/54 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 reliability, efficiency, and automotive-grade validation.
The SAxxA series is part of Vishay's TRANSZORB® TVS family, engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where clamping precision, thermal stability, and qualification compliance are critical.
FAQ
What is the polarity configuration of the SA33A-E3/54?
The SA33A-E3/54 is a unidirectional TVS diode with clearly marked cathode polarity: a colored band on the DO-15 package body identifies the cathode terminal. This configuration allows it to conduct only during positive transients relative to ground, making it ideal for protecting positive supply rails. The anode remains unmarked and connects to ground or the reference node in standard clamp topology.
Does the SA33A-E3/54 meet automotive qualification standards?
Yes, the SA33A-E3/54 is AEC-Q101 qualified, as confirmed in Vishay document 88378 (Revision: 27-Sep-2021). This qualification validates its performance under accelerated stress tests including temperature cycling, humidity bias, and mechanical shock - ensuring suitability for under-hood and cabin-mounted automotive electronics such as body control modules and sensor nodes where long-term reliability is mandatory.
What is the clamping voltage of the SA33A-E3/54 at its rated peak pulse current?
The SA33A-E3/54 has a maximum clamping voltage (VC) of 53.3 V at its rated peak pulse current (IPPM) of 9.4 A, measured using the standardized 10/1000 μs double-exponential waveform. This value represents the upper limit of voltage imposed on the protected circuit during worst-case surge conditions and is critical for verifying compatibility with the absolute maximum ratings of downstream ICs or MOSFETs.
Can the SA33A-E3/54 be used in bidirectional protection applications?
No, the SA33A-E3/54 is strictly unidirectional and must not be used for bidirectional transient suppression. For symmetrical AC or dual-polarity signal line protection, Vishay specifies the CA-suffix variants (e.g., SA33CA). Using SA33A-E3/54 in bidirectional configurations risks failure during negative-going transients, as it lacks reverse avalanche capability - a design limitation explicitly defined in the SA5.0A–SA170CA datasheet.
What is the maximum junction temperature rating for the SA33A-E3/54?
The SA33A-E3/54 has a maximum junction temperature (TJ max) rating of +175 °C, as specified in the "Maximum Ratings" table of Vishay document 88378. This high thermal limit enables reliable operation in demanding environments such as automotive engine compartments or industrial motor drive enclosures, provided PCB copper area and ambient airflow support adequate heat dissipation from its 3.0 W steady-state power rating.
SA33A-E3/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AC, DO-15, Axial
- 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):
- 9.4A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA33A-E3/54 FAQ
1.How can I place an order for SA33A-E3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA33A-E3/54 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 SA33A-E3/54 reliable?
The price and inventory of SA33A-E3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA33A-E3/54 is usually 5 days.
3.What payment methods are accepted for SA33A-E3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA33A-E3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA33A-E3/54?
SA33A-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA33A-E3/54 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 SA33A-E3/54?
For technical support, including SA33A-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA33A-E3/54 requirements.
6.How does Aetrix verify that SA33A-E3/54 is sourced from the original manufacturer or authorized distributors?
All SA33A-E3/54 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 SA33A-E3/54 meets industry standards.
7.What is the process for return or replacement of SA33A-E3/54?
All SA33A-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA33A-E3/54, 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 SA33A-E3/54 part is unused and in its original packaging.
Return procedure for SA33A-E3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA33A-E3/54 Tags
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