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Vishay General Semiconductor - Diodes Division SMA5J33AHE3/5A
- Part No.:
- SMA5J33AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J33AHE3/5A.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMA5J33AHE3/5A 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 standoff voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 500 W peak pulse power (10/1000 µs), 9.4 A peak pulse current (IPPM), and clamps to ≤53.3 V under surge. It is AEC-Q101 qualified and used in automotive power rail protection.
For engineers reviewing the SMA5J33AHE3/5A datasheet, SMA5J33AHE3/5A pinout, SMA5J33AHE3/5A application, or SMA5J33AHE3/5A equivalent, key selection criteria include unidirectional polarity, 500 W surge rating, 33 V operating voltage compatibility, thermal resistance (RθJA = 80 °C/W), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This TVS diode operates as a clamping device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold (VBR ≥36.7 V), limiting transient energy by diverting surge current to ground. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1.0 ps).
Rated for 150 °C maximum junction temperature and mounted on 5.0 mm × 5.0 mm copper pads, it delivers 500 W peak pulse power per 10/1000 µs waveform with low incremental surge resistance-critical for protecting MOSFETs and ICs against inductive switching transients and ESD events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC operating window. |
| VBR (Breakdown Voltage) | 36.7–40.6 V at 1 mA - Confirmed avalanche initiation range; ensures reliable turn-on above system nominal voltage. |
| VC (Clamping Voltage) | ≤53.3 V at IPPM - Maximum voltage seen by protected circuit during 9.4 A surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 500 W (10/1000 µs) - Energy-handling capacity for standardized lightning/surge waveforms; enables robust front-end protection. |
| ID (Reverse Leakage) | ≤1.0 µA at VWM - Ultra-low leakage preserves battery life and avoids false triggering in low-power sensor circuits. |
| TJ max. | 150 °C - Enables operation in under-hood automotive environments and industrial enclosures without derating. |
| RθJA | 80 °C/W - Thermal resistance from junction to ambient; informs heatsinking requirements on standard PCB layout. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads. Cathode indicated by band; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction; grounded side in typical unidirectional TVS configuration. | Connected to system ground or low-impedance return path to shunt surge current safely away from protected ICs. |
| Cathode | Marked end (band); reverse-biased terminal during normal operation; avalanche conduction node during overvoltage. | Connected to protected line (e.g., 33 V rail); initiates clamping when voltage exceeds VBR, limiting downstream voltage to ≤53.3 V. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics-ensures reliability across temperature cycling and vibration stress. |
| Glass-passivated junction | Provides stable electrical characteristics over lifetime and immunity to humidity-induced degradation in harsh environments. |
| MSL Level 1 (260 °C) | Enables lead-free reflow soldering without moisture-related popcorning; supports automated SMT assembly without pre-bake. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a), improving clamping precision. |
| UL 94 V-0 molding compound | Self-extinguishing encapsulation meets fire-safety standards for industrial and transportation equipment. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 33 V supply lines in engine control modules (ECMs) from load-dump transients (ISO 16750-2) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between 33 V rail and chassis ground to limit surge voltage to ≤53.3 V. Use Value: Prevents latch-up or permanent damage to microcontrollers and CAN transceivers exposed to >100 V transients. |
Use Scenario: Safeguarding analog input pins of industrial pressure sensors connected to 24–36 V field buses. IC Role / Device Role / Timing Role: Standoff-rated TVS (VWM = 33 V) installed at connector interface to absorb ESD (IEC 61000-4-2) and cable discharge events. Use Value: Maintains signal integrity with <1.0 µA leakage at operating voltage, avoiding DC offset errors in precision measurement circuits. |
| Telecom DC Power Input Protection | Consumer Device USB Power Switching |
Use Scenario: Front-end surge suppression on 33 V DC inputs of telecom base station power supplies subjected to lightning-induced surges. IC Role / Device Role / Timing Role: High-power (500 W) TVS absorbing 10/1000 µs transients while maintaining low RθJA for sustained duty cycles. Use Value: Survives repeated 5 kV surge events per IEC 61000-4-5 without parameter drift or catastrophic failure. |
Use Scenario: Overvoltage clamp on USB PD-compatible 20–33 V power switches in portable docking stations. IC Role / Device Role / Timing Role: Fast-response (sub-nanosecond) unidirectional TVS placed upstream of load switch to prevent gate oxide damage during hot-plug events. Use Value: Clamps 36 V transients to ≤53.3 V within picoseconds-preserving MOSFET reliability without adding RC delay. |
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-E3/5A | No AEC-Q101 qualification; commercial-grade only; identical electrical specs and package. | Suitable for non-automotive industrial or consumer use where automotive reliability testing is not required. | Select SMA5J33AHE3/5A when AEC-Q101 compliance is mandatory; choose SMA5J33A-E3/5A for cost-sensitive commercial designs. |
| SMA6J33AHE3/5A | 600 W peak pulse power (vs. 500 W); same VWM/VBR/VC; higher IPPM (10.3 A); identical AEC-Q101 qualification. | Better suited for systems requiring margin beyond ISO 7637-2 test levels or extended surge repetition. | Choose SMA6J33AHE3/5A if design requires headroom above 500 W; SMA5J33AHE3/5A remains optimal for validated 500 W applications. |
Compared with SMA5J33A-E3/5A, SMA5J33AHE3/5A adds automotive qualification without sacrificing electrical performance; versus SMA6J33AHE3/5A, it trades 100 W surge headroom for tighter thermal footprint and lower cost-ideal for space-constrained AEC-Q101 designs at exactly 500 W requirement.
Availability
SMA5J33AHE3/5A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface protection, and telecom DC power input protection requiring stable component supply, long-term lifecycle support, and AEC-Q101 traceability.
Supply support for SMA5J33AHE3/5A 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, power density, and application-specific qualification.
The SMA5J series is engineered for high-energy transient suppression in automotive, industrial, and telecom infrastructure-delivering AEC-Q101-compliant surge robustness in compact surface-mount packages.
FAQ
What is the clamping voltage of SMA5J33AHE3/5A at its rated peak pulse current?
The SMA5J33AHE3/5A clamps to a maximum of 53.3 V when subjected to its specified peak pulse current (IPPM) of 9.4 A under a 10/1000 µs waveform. This value is measured at the device terminals and defines the upper voltage limit imposed on protected circuitry during surge events. The SMA5J33AHE3/5A maintains this clamping performance across its full operating temperature range (−55 °C to +150 °C), ensuring consistent protection in demanding environments.
Is SMA5J33AHE3/5A suitable for bidirectional transient suppression?
No, SMA5J33AHE3/5A is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. It conducts only in reverse bias during overvoltage events and blocks forward current like a standard diode. For bidirectional protection, Vishay offers the SMA5J33CA variant. Using SMA5J33AHE3/5A in a bidirectional application would leave positive-going transients unprotected and may cause forward conduction failure.
What does the "HE3" suffix signify in SMA5J33AHE3/5A?
"HE3" denotes RoHS-compliant construction with AEC-Q101 qualification-specifically, high-reliability automotive grade with matte tin plating and JESD201 Class 2 whisker resistance. It distinguishes SMA5J33AHE3/5A from commercial variants (e.g., "E3") and halogen-free versions ("HM3"). The "5A" indicates 7500-unit reel packaging on 13-inch tape, supporting high-volume SMT assembly.
How does the thermal resistance of SMA5J33AHE3/5A affect PCB layout?
SMA5J33AHE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W when mounted on 5.0 mm × 5.0 mm copper pads per terminal. To maintain TJ ≤150 °C under worst-case 500 W surge, designers must ensure adequate copper area and avoid thermal bottlenecks. Reducing pad size or omitting thermal vias increases RθJA, risking parametric shift or failure-so the SMA5J33AHE3/5A requires strict adherence to Vishay's recommended land pattern.
Can SMA5J33AHE3/5A replace SMA5J33A-E3/5A without design changes?
Yes-SMA5J33AHE3/5A is a drop-in replacement for SMA5J33A-E3/5A in terms of footprint, solder profile (MSL Level 1), and all electrical parameters. The only difference is AEC-Q101 qualification, which adds no mechanical or thermal constraints. No PCB layout, schematic, or firmware changes are needed; SMA5J33AHE3/5A simply extends reliability assurance to automotive applications while maintaining full functional equivalence.
SMA5J33AHE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA5J33AHE3/5A FAQ
1.How can I place an order for SMA5J33AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J33AHE3/5A 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 SMA5J33AHE3/5A reliable?
The price and inventory of SMA5J33AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J33AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMA5J33AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J33AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J33AHE3/5A?
SMA5J33AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J33AHE3/5A 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 SMA5J33AHE3/5A?
For technical support, including SMA5J33AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J33AHE3/5A requirements.
6.How does Aetrix verify that SMA5J33AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMA5J33AHE3/5A 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 SMA5J33AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMA5J33AHE3/5A?
All SMA5J33AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J33AHE3/5A, 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 SMA5J33AHE3/5A part is unused and in its original packaging.
Return procedure for SMA5J33AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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