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Vishay General Semiconductor - Diodes Division SMA5J20AHE3/5A
- Part No.:
- SMA5J20AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J20AHE3/5A.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,365
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Product details
Overview
SMA5J20AHE3/5A 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 20 V stand-off voltage (VWM), 22.2–24.5 V breakdown voltage (VBR), 32.4 V clamping voltage at 15.4 A peak pulse current, and 500 W peak pulse power rating with 10/1000 µs waveform - used to safeguard MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMA5J20AHE3/5A datasheet, SMA5J20AHE3/5A pinout, SMA5J20AHE3/5A application, or SMA5J20AHE3/5A equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 150 °C max junction temperature, RoHS-compliant matte tin terminals, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a clamping device that transitions from high-impedance standby to low-impedance conduction when reverse voltage exceeds VBR, limiting transient energy to protected downstream circuitry. Its glass-passivated junction ensures stable breakdown behavior and fast response time (<1 ns), while low incremental surge resistance enables effective suppression of inductive switching spikes and ESD events.
The SMA5J20AHE3/5A is rated for 500 W peak pulse power under 10/1000 µs waveform, with thermal resistance of 80 °C/W (junction-to-ambient) and 25 °C/W (junction-to-lead). It meets MSL Level 1 per J-STD-020, supports 260 °C reflow peak, and is qualified to AEC-Q101 for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR (min/max) | 22.2 V / 24.5 V - verified breakdown range at 1 mA test current; ensures predictable turn-on across process variation and temperature. |
| VC @ IPPM | 32.4 V at 15.4 A - clamping voltage during 10/1000 µs surge; determines maximum stress imposed on protected IC or MOSFET drain. |
| PPPM | 500 W - peak pulse power handling capability; enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on DC rails. |
| TJ max | +150 °C - maximum junction temperature; supports operation in under-hood automotive environments and enclosed industrial enclosures. |
| Polarity | Unidirectional - cathode-banded device; blocks forward conduction, clamps only reverse transients - ideal for DC supply rail protection. |
| Package | SMA (DO-214AC) - surface-mount package with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with standard SMT pick-and-place and reflow profiles. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, cathode band marking on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-side reference; completes clamping loop during overvoltage event. |
| Cathode | Reverse-biased terminal / protected line connection | Connected to the line being protected (e.g., 24 V rail); conducts when transient exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics; supports 150 °C operation and extended temperature cycling. |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress without parameter drift or leakage increase. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a), improving clamping precision. |
| MSL Level 1 rating | Enables unlimited floor life and compatibility with standard 260 °C lead-free reflow without moisture-related popcorning. |
| Automated placement optimized | Standardized SMA footprint and lead geometry support high-yield, high-speed SMT assembly with industry-standard feeders and vision systems. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply inputs in engine control modules (ECMs) against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery rail and DC-DC converter input. Use Value: Limits transient voltage to ≤32.4 V during 120 V/50 ms load dump events, preventing damage to upstream regulators and microcontrollers. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) in industrial pressure sensors exposed to field wiring surges. IC Role / Device Role / Timing Role: Reverse-polarity transient clamp on sensor output node, referenced to system ground. Use Value: Clamps induced lightning-induced surges up to 500 W without degrading signal integrity or introducing offset error. |
| Telecom DC Power Input Protection | Consumer Device USB Port Protection |
Use Scenario: Shielding 48 V PoE-powered equipment inputs from Ethernet cable-induced surges and hot-swap transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC input stage prior to isolation and regulation. Use Value: Withstands repetitive 10/1000 µs surges up to 500 W while maintaining <1 µA leakage at 20 V, preserving standby power budget. |
Use Scenario: Adding secondary-level surge immunity to USB VBUS lines in portable speakers and smart home hubs. IC Role / Device Role / Timing Role: Standoff-rated TVS on 5 V rail, positioned after fuse and before USB controller. Use Value: Clamps ESD events (IEC 61000-4-2 ±15 kV contact) to <35 V within <1 ns, preventing latch-up in USB PHY ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J20A-E3/5A | No AEC-Q101 qualification; commercial-grade only; identical electrical specs and package. | Not suitable for automotive under-hood use; acceptable for consumer or industrial indoor applications. | Select when AEC-Q101 is not required and cost optimization is prioritized. |
| SMA5J20CAHE3/5A | Bidirectional variant; symmetric clamping in both polarities; same VWM (20 V), but VBR min/max widened to 22.2–27.7 V. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where polarity reversal may occur. | Choose only if bidirectional protection is needed; not a drop-in replacement due to polarity and clamping asymmetry. |
Compared with SMA5J20AHE3/5A, the E3/5A variant lacks automotive qualification but offers identical surge performance at lower cost, while the CAHE3/5A provides bidirectional clamping essential for differential or AC-signaled interfaces - neither is pin-compatible without circuit redesign.
Availability
SMA5J20AHE3/5A is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface design, and telecom DC input protection requiring stable component supply, AEC-Q101 compliance, and high-reliability surge immunity.
Supply support for SMA5J20AHE3/5A 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-power-density solutions.
The SMA5J series is engineered for high-energy transient suppression in space-constrained SMT applications, targeting automotive, industrial, and telecom systems where robustness, repeatability, and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of the SMA5J20AHE3/5A under a 10/1000 µs surge?
The SMA5J20AHE3/5A clamps to a maximum of 32.4 V when subjected to its rated peak pulse current of 15.4 A under a 10/1000 µs waveform. This value is measured at the device terminals with specified PCB pad layout (0.2" × 0.2" copper per terminal) and represents the upper limit of voltage seen by downstream components during surge events. The SMA5J20AHE3/5A maintains this clamping performance across its full operating temperature range.
Is the SMA5J20AHE3/5A suitable for automotive applications?
Yes, the SMA5J20AHE3/5A is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments. Its 150 °C maximum junction temperature, MSL Level 1 reflow compatibility, and validated performance across temperature cycling and humidity testing meet automotive reliability requirements. The SMA5J20AHE3/5A is commonly deployed in engine control units, body control modules, and ADAS power supplies.
How does the SMA5J20AHE3/5A differ from the SMA5J20A-E3/5A?
The SMA5J20AHE3/5A includes AEC-Q101 qualification and automotive-grade screening, whereas the SMA5J20A-E3/5A is commercial-grade only. Electrically and physically identical, both share the same VWM (20 V), VBR (22.2–24.5 V), and 500 W PPPM rating. The SMA5J20AHE3/5A is designated for automotive and harsh-environment applications where qualification evidence is contractually required.
What is the reverse leakage current of the SMA5J20AHE3/5A at its stand-off voltage?
At 20 V reverse bias (VWM) and TA = 25 °C, the SMA5J20AHE3/5A exhibits a maximum reverse leakage current (ID) of 1.0 µA. This ultra-low leakage preserves system efficiency in always-on circuits and avoids false triggering in high-impedance sensing nodes. Leakage remains below 5 µA up to 80 % of VWM across the full -55 °C to +150 °C operating range.
Can the SMA5J20AHE3/5A be used in bidirectional signal protection?
No - the SMA5J20AHE3/5A is unidirectional and will conduct forward current if positive voltage is applied to its anode relative to cathode. For bidirectional protection (e.g., RS-485, CAN, or AC-coupled lines), the SMA5J20CAHE3/5A variant must be used. Using the SMA5J20AHE3/5A in such applications risks forward conduction, overheating, and failure. Always verify polarity alignment before integration.
SMA5J20AHE3/5A 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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 15.4A
- 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)
SMA5J20AHE3/5A FAQ
1.How can I place an order for SMA5J20AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J20AHE3/5A 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 SMA5J20AHE3/5A reliable?
The price and inventory of SMA5J20AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J20AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMA5J20AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J20AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J20AHE3/5A?
SMA5J20AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J20AHE3/5A 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 SMA5J20AHE3/5A?
For technical support, including SMA5J20AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J20AHE3/5A requirements.
6.How does Aetrix verify that SMA5J20AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMA5J20AHE3/5A 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 SMA5J20AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMA5J20AHE3/5A?
All SMA5J20AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J20AHE3/5A, 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 SMA5J20AHE3/5A part is unused and in its original packaging.
Return procedure for SMA5J20AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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