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Vishay General Semiconductor - Diodes Division SMA5J28AHE3_A/I
- Part No.:
- SMA5J28AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J28AHE3_A/I.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMA5J28AHE3_A/I 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 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 45.4 V clamping voltage (VC) at 11.0 A peak pulse current (IPPM), and 500 W peak pulse power (PPPM) with 10/1000 μs waveform - used to safeguard automotive ECUs, industrial sensor interfaces, and DC power rails against ESD and load dump.
For engineers reviewing the SMA5J28AHE3_A/I datasheet, SMA5J28AHE3_A/I pinout, SMA5J28AHE3_A/I application, or SMA5J28AHE3_A/I equivalent, key selection criteria include verified clamping performance under 10/1000 μs transients, AEC-Q101 qualification status, thermal resistance (RθJA = 80 °C/W), and compatibility with automated SMT placement on standard 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, leveraging glass-passivated junction technology for stable breakdown and low incremental surge resistance. Its 500 W PPPM rating is specified at TA = 25 °C and derated above that temperature per Figure 2 of the datasheet, with maximum junction temperature limited to +150 °C.
The device delivers fast response time (<1 ns), meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and supports surge currents up to 40 A (IFSM, 8.3 ms half-sine). It is RoHS-compliant and AEC-Q101 qualified - confirmed by the "HE3" suffix and "_A/I" tape-and-reel packaging code indicating automotive-grade traceability and 7500-unit reel delivery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before clamping begins; sets threshold for DC power rail or signal line protection. |
| VBR (min/max) | 31.1 V / 34.4 V at IT = 1 mA - guaranteed breakdown range defining turn-on consistency across production lots. |
| VC @ IPPM | 45.4 V at 11.0 A - clamped voltage during 10/1000 μs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 500 W - peak pulse power handling capacity; defines survivability against standardized lightning or inductive-switching surges. |
| TJ max. | +150 °C - maximum junction temperature; constrains thermal design margin when mounted on PCB copper pads. |
| RθJA | 80 °C/W - junction-to-ambient thermal resistance; used to calculate temperature rise under sustained leakage or repeated pulses. |
| AEC-Q101 | Qualified - validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
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. Cathode indicated by band marking; polarity critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward surge events (e.g., reverse-battery protection). |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 24 V supply); initiates avalanche breakdown when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over temperature and lifetime, minimizing parameter drift in harsh automotive environments. |
| MSL Level 1 rating | Enables single-reflow assembly without moisture sensitivity concerns; peak reflow tolerance up to 260 °C. |
| Low incremental surge resistance | Supports tighter VC-VBR differential (ΔV = 14.3 V), improving protection margin for 3.3 V/5 V/24 V logic and power stages. |
| AEC-Q101 qualification | Validates reliability for automotive underhood and cabin applications, including extended temperature cycling and humidity testing. |
| Automated placement compatibility | Standardized SMA footprint and lead geometry ensure high-yield pick-and-place integration in high-volume manufacturing. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply inputs in engine control units (ECUs) against load dump transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and DC-DC input stage. Use Value: Limits transient voltage to ≤45.4 V, preventing damage to upstream regulators and microcontrollers rated for 40 V absolute maximum. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) in factory automation sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Point-of-entry protection at connector interface, shunting surge energy to ground before signal conditioning circuitry. Use Value: Sub-1 ns response ensures clamping occurs before sensitive op-amps or ADC drivers experience overvoltage stress. |
| Telecom DC Power Input Protection | Consumer Device USB Power Line Protection |
Use Scenario: Safeguarding 48 V PoE-powered equipment inputs against induced surges from nearby AC wiring or lightning coupling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side DC bus after isolation transformer and rectification. Use Value: 500 W PPPM rating sustains multiple 10/1000 μs surges without degradation, meeting IEC 61000-4-5 Level 4 requirements. |
Use Scenario: Adding robustness to USB-C VBUS lines in portable speakers or docking stations exposed to hot-plug and cable ESD. IC Role / Device Role / Timing Role: Secondary-level TVS placed downstream of USB PD controller to protect port controller and power switches. Use Value: Low leakage (<1 μA at 28 V) avoids standby current drain while maintaining fast clamping for ±15 kV contact ESD per IEC 61000-4-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J28AHM3_A/I | Halogen-free variant with identical electrical specs and AEC-Q101 qualification; same package and thermal performance. | No functional difference; selected where halogen-free compliance is mandated by OEM environmental policies. | Direct material substitution when RoHS + halogen-free certification is required; no layout or validation change needed. |
| SMCJ28AHE3_A/I | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package; higher RθJA (40 °C/W) and 1500 W PPPM rating. | Better thermal dissipation and surge handling; suited for higher-power systems where board space permits larger footprint. | Choose when system-level surge tests exceed 500 W or when thermal margin is constrained; requires PCB pad revision. |
Compared with SMA5J28AHE3_A/I, SMA5J28AHM3_A/I offers identical protection performance with halogen-free construction, while SMCJ28AHE3_A/I provides higher power handling and thermal capability at the cost of increased board area - enabling trade-offs between miniaturization and ruggedness in automotive and industrial designs.
Availability
SMA5J28AHE3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, and telecom power supplies requiring stable component supply, AEC-Q101 traceability, and consistent 500 W transient suppression performance.
Supply support for SMA5J28AHE3_A/I 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, power density, and automotive qualification.
The SMA5J series is engineered for high-power-density transient suppression in space-constrained automotive and industrial applications, delivering 500 W surge capability in the compact SMA package while meeting AEC-Q101 stress test requirements.
FAQ
What is the clamping voltage of the SMA5J28AHE3_A/I under a 10/1000 μs surge?
The SMA5J28AHE3_A/I has a maximum clamping voltage (VC) of 45.4 V when subjected to its rated peak pulse current (IPPM) of 11.0 A using the standard 10/1000 μs waveform. This value is measured at TA = 25 °C with the device mounted on 0.2" × 0.2" copper pads per the datasheet test condition. The SMA5J28AHE3_A/I maintains this clamping performance across its operational temperature range, making it suitable for protecting 24 V systems where downstream components have 40–48 V absolute maximum ratings.
Is the SMA5J28AHE3_A/I qualified for automotive applications?
Yes, the SMA5J28AHE3_A/I is AEC-Q101 qualified, as confirmed by the "HE3" suffix and documentation in Vishay's datasheet (Document Number: 88875, Revision: 09-Jan-2024). This qualification covers stress tests including high-temperature operating life, temperature cycling, and ESD, validating its use in automotive powertrain, chassis, and body electronics. The SMA5J28AHE3_A/I is specifically intended for under-hood and cabin applications requiring robust transient immunity and long-term reliability.
What does the "_A/I" suffix mean in SMA5J28AHE3_A/I?
The "_A/I" suffix in SMA5J28AHE3_A/I indicates the packaging configuration: "A" denotes the revision code (Revision A), and "I" specifies 13-inch diameter plastic tape-and-reel packaging containing 7500 units. This format supports high-volume SMT assembly and aligns with Vishay's ordering convention for automotive-grade parts. The SMA5J28AHE3_A/I is distinct from "_A/H" (7-inch reel, 1800 units) and ensures full traceability for production lots requiring automotive PPAP documentation.
How does the SMA5J28AHE3_A/I compare to bidirectional TVS diodes like SMA5J28CA?
The SMA5J28AHE3_A/I is unidirectional and optimized for DC power line protection with polarity-sensitive placement (cathode to protected line), whereas SMA5J28CA is bidirectional and symmetrical for AC or floating signal lines. SMA5J28AHE3_A/I offers lower leakage (<1 μA at 28 V) and supports forward surge current (IFSM = 40 A), unlike SMA5J28CA. For 24 V automotive rails, SMA5J28AHE3_A/I provides superior clamping efficiency and thermal stability - confirming its role as the preferred choice for polarized supply protection.
What is the thermal resistance of the SMA5J28AHE3_A/I, and how does it affect layout?
The SMA5J28AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This value assumes minimal PCB copper; increasing pad area or adding thermal vias reduces effective RθJA and improves power handling during repetitive surges. Layout must maintain the recommended SMA (DO-214AC) footprint and avoid solder mask over thermal pads to prevent overheating - especially critical in automotive applications where ambient temperatures exceed 85 °C.
SMA5J28AHE3_A/I 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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 11A
- 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)
SMA5J28AHE3_A/I FAQ
1.How can I place an order for SMA5J28AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J28AHE3_A/I 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 SMA5J28AHE3_A/I reliable?
The price and inventory of SMA5J28AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J28AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMA5J28AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J28AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J28AHE3_A/I?
SMA5J28AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J28AHE3_A/I 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 SMA5J28AHE3_A/I?
For technical support, including SMA5J28AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J28AHE3_A/I requirements.
6.How does Aetrix verify that SMA5J28AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMA5J28AHE3_A/I 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 SMA5J28AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMA5J28AHE3_A/I?
All SMA5J28AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J28AHE3_A/I, 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 SMA5J28AHE3_A/I part is unused and in its original packaging.
Return procedure for SMA5J28AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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