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Vishay General Semiconductor - Diodes Division SMA5J33A-E3/5A
- Part No.:
- SMA5J33A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J33A-E3/5A.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,001
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Product details
Overview
SMA5J33A-E3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on power and signal lines. It features a 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR), 53.3 V clamping voltage (VC) at 9.4 A peak pulse current, and 500 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive power supply rails and industrial sensor interfaces.
For engineers reviewing the SMA5J33A-E3/5A datasheet, SMA5J33A-E3/5A pinout, SMA5J33A-E3/5A application, or SMA5J33A-E3/5A equivalent, key selection criteria include clamping performance under 10/1000 μs surges, unidirectional polarity marking, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches to limit transient energy across protected circuit nodes. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response (<1 ns), while low incremental surge resistance enables effective suppression of inductive switching spikes.
The device is rated for -55 °C to +150 °C junction temperature, meets MSL Level 1 per J-STD-020 (260 °C peak reflow), and supports unidirectional surge handling up to 40 A IFSM (8.3 ms half-sine). Thermal resistance is 80 °C/W (junction-to-ambient) and 25 °C/W (junction-to-lead) under standard mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC bias margin for protected line. |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - verified avalanche onset range; ensures predictable turn-on across manufacturing lot and temperature. |
| VC @ IPPM | 53.3 V at 9.4 A - clamping voltage during 10/1000 μs surge; determines maximum stress imposed on downstream ICs or MOSFETs. |
| PPPM | 500 W - peak pulse power dissipation capability; defines single-event surge energy handling without failure. |
| IPPM | 9.4 A - peak pulse current supported at VC; correlates directly with surge immunity level per IEC 61000-4-5. |
| Junction temp. max | +150 °C - maximum allowable operating junction temperature; sets thermal derating envelope for sustained surge duty cycles. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity marked by cathode band on one end; unidirectional configuration only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes conduction path during reverse avalanche. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 33 V rail); carries full transient current into anode during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| Clamping performance | VC/VBR ratio = 1.37 - low overvoltage margin ensures minimal stress on 3.3 V or 5 V logic interfaces downstream. |
| Surge robustness | 500 W peak pulse power with 10/1000 μs waveform - withstands severe transients per ISO 7637-2 Pulse 5a/b and IEC 61000-4-5 Level 4. |
| Mounting reliability | MSL Level 1, 260 °C peak reflow - supports lead-free assembly without popcorn cracking or delamination. |
| Leakage control | ≤1.0 μA at 33 V - negligible standby current draw in battery-powered or low-power sensor nodes. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 33 V battery-fed ECUs against load dump and alternator ripple. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between power rail and chassis ground. Use Value: Clamps surges to ≤53.3 V, preventing damage to 36 V-rated CAN transceivers and microcontrollers. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA loop drivers) from ESD and inductive kickback. IC Role / Device Role / Timing Role: Bidirectional-capable protection element (though SMA5J33A-E3/5A is unidirectional, used with series impedance for signal integrity). Use Value: Sub-1 ns response limits voltage overshoot to <5% of VC, preserving ADC accuracy and op-amp stability. |
| Telecom DC Power Input Stage | Consumer Appliance Motor Driver Supply |
Use Scenario: Front-end protection for 33 V telecom rectifier outputs exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device upstream of DC-DC converters and PMICs. Use Value: 500 W rating absorbs 10/1000 μs transients up to 100 J without degradation, meeting GR-1089-CORE Zone 3 requirements. |
Use Scenario: Suppressing back-EMF from brushed DC motors in smart home appliances. IC Role / Device Role / Timing Role: Unidirectional TVS mounted across motor terminals or H-bridge supply rails. Use Value: 40 A IFSM rating handles repetitive 8.3 ms motor stall currents without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J33A-M3/5A | Halogen-free, RoHS-compliant variant; identical electrical specs and package; same thermal and surge ratings. | No functional difference; selected where halogen-free compliance is mandated (e.g., EU medical equipment). | Direct substitution if halogen-free material declaration is required; no layout or test changes needed. |
| SMCJ33A-E3/57T | Same VWM/VC but in larger SMC (DO-214AB) package; higher IPPM (13.9 A) and PPPM (1500 W); RθJA = 35 °C/W. | Better thermal performance and surge headroom; suited for high-reliability or high-duty-cycle environments. | Choose when board space allows larger footprint and system-level surge testing exceeds 500 W requirements. |
Compared with SMA5J33A-E3/5A, SMA5J33A-M3/5A offers identical protection performance with halogen-free construction, while SMCJ33A-E3/57T delivers 3× higher pulse power and lower thermal resistance - enabling longer surge duration tolerance and reduced junction temperature rise in thermally constrained designs.
Availability
SMA5J33A-E3/5A is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom power supplies requiring stable component supply, RoHS compliance, and AEC-Q101-qualified alternatives (via HE3 suffix variants).
Supply support for SMA5J33A-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, TVS devices, and optoelectronics with emphasis on reliability, precision, and high-power density.
The SMA5J series was engineered for high-energy transient suppression in space-constrained SMT applications - targeting automotive, industrial, and communications systems where fast response, low clamping, and reflow compatibility are critical.
FAQ
What is the clamping voltage of the SMA5J33A-E3/5A under a 10/1000 μs surge?
The SMA5J33A-E3/5A clamps to 53.3 V at its rated peak pulse current of 9.4 A under a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 09-Jan-2024. The clamping voltage defines the maximum voltage seen by downstream components during surge events, making it critical for ensuring compatibility with 36 V-rated ICs. SMA5J33A-E3/5A maintains this performance across its full operating temperature range.
Is the SMA5J33A-E3/5A RoHS-compliant and lead-free?
Yes, the SMA5J33A-E3/5A is RoHS-compliant and lead-free, as indicated by the "E3" suffix per Vishay's ordering nomenclature. Its matte tin-plated leads meet J-STD-002 and JESD 22-B102 solderability standards, and the molding compound complies with UL 94 V-0 flammability rating. The "E3" designation confirms commercial-grade RoHS compliance without halogens - distinct from the "M3" (halogen-free) or "HE3" (AEC-Q101 qualified) variants. SMA5J33A-E3/5A is suitable for lead-free reflow up to 260 °C.
Does the SMA5J33A-E3/5A have bidirectional capability?
No, the SMA5J33A-E3/5A is a unidirectional TVS diode. Its polarity is marked by a cathode band on the package, and it conducts only during reverse-biased transients. Bidirectional versions use the "CA" suffix (e.g., SMA5J33CA). The SMA5J33A-E3/5A is intended for DC power line protection where polarity is fixed; using it in AC or floating signal paths requires external design considerations such as series impedance or complementary diode pairing. Always verify polarity alignment before PCB layout.
What is the maximum junction temperature rating for the SMA5J33A-E3/5A?
The SMA5J33A-E3/5A has a maximum junction temperature (TJ) rating of +150 °C, with an operating and storage range of -55 °C to +150 °C. This rating applies under specified mounting conditions: 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Thermal derating curves in the datasheet show power reduction above 25 °C ambient, and RθJA is 80 °C/W. Exceeding TJ max risks parametric shift or catastrophic failure - thermal design must ensure SMA5J33A-E3/5A stays within this limit during worst-case surge duty cycles.
How does the SMA5J33A-E3/5A compare to the SMA5J33A-M3/5A?
The SMA5J33A-E3/5A and SMA5J33A-M3/5A share identical electrical characteristics, package (SMA/DO-214AC), and mechanical dimensions. The sole difference is material composition: "E3" denotes RoHS-compliant with standard brominated flame retardant, while "M3" specifies halogen-free RoHS compliance. Both meet JESD 201 Class 2 whisker resistance and MSL Level 1. SMA5J33A-E3/5A is selected for general commercial applications; SMA5J33A-M3/5A is chosen where halogen-free certification is contractually required - no redesign or validation is needed for substitution.
SMA5J33A-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:
- 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA5J33A-E3/5A FAQ
1.How can I place an order for SMA5J33A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J33A-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 SMA5J33A-E3/5A reliable?
The price and inventory of SMA5J33A-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 SMA5J33A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMA5J33A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J33A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J33A-E3/5A?
SMA5J33A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J33A-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 SMA5J33A-E3/5A?
For technical support, including SMA5J33A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J33A-E3/5A requirements.
6.How does Aetrix verify that SMA5J33A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMA5J33A-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 SMA5J33A-E3/5A meets industry standards.
7.What is the process for return or replacement of SMA5J33A-E3/5A?
All SMA5J33A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J33A-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 SMA5J33A-E3/5A part is unused and in its original packaging.
Return procedure for SMA5J33A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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