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Vishay General Semiconductor - Diodes Division SMA5J28AHM3_A/I
- Part No.:
- SMA5J28AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J28AHM3_A/I.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,117
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Product details
Overview
SMA5J28AHM3_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 MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMA5J28AHM3_A/I datasheet, SMA5J28AHM3_A/I pinout, SMA5J28AHM3_A/I application, or SMA5J28AHM3_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 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a unidirectional clamping device with glass-passivated junction and low incremental surge resistance, enabling fast response to ESD and lightning-induced transients. Its 150 °C maximum junction temperature and MSL Level 1 rating support reflow soldering up to 260 °C peak.
The SMA5J28AHM3_A/I is halogen-free, RoHS-compliant, and AEC-Q101 qualified - indicated by the "HM3" suffix and revision code "A/I". Polarity is marked by a cathode band; it delivers 500 W peak pulse power only when mounted per recommended pad layout (0.2" × 0.2" copper).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR (min/max) | 31.1 V / 34.4 V at IT = 1 mA - verified breakdown threshold ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 45.4 V at 11.0 A - clamping voltage limits stress on downstream components during 10/1000 μs surges. |
| PPPM | 500 W - peak pulse power handling capacity with standard 10/1000 μs waveform, derated above 25 °C ambient. |
| RθJA | 80 °C/W - thermal resistance from junction to ambient; requires adequate PCB copper area for sustained surge duty. |
| TJ max. | 150 °C - maximum junction temperature; supports operation in under-hood automotive environments. |
| IFSM | 40 A - non-repetitive forward surge current rating (8.3 ms half-sine), relevant for fault-current limiting in DC power paths. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads; meets UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry terminal | Connected to lower-potential side of protected line; unidirectional conduction path during surge. |
| Cathode (marked with band) | Reverse-biased clamping terminal | Connected to higher-potential rail (e.g., VBUS); conducts during overvoltage to clamp to VC. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan. |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for modern automotive and industrial electronics manufacturing. |
| Glass passivated junction | Enhances long-term stability and moisture resistance versus epoxy-passivated alternatives. |
| MSL Level 1 (260 °C peak) | Enables standard lead-free reflow without prebaking; compatible with high-volume SMT assembly lines. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients, improving clamping precision and system robustness. |
Applications
| Automotive Power Supply Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V power rails in engine control units (ECUs) against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery input and DC-DC converter input stage. Use Value: Limits transient voltage to ≤45.4 V, preventing damage to downstream regulators rated for 40 V absolute maximum. |
Use Scenario: Shielding analog sensor signal lines (e.g., pressure, temperature) from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: Point-of-entry transient suppressor on differential or single-ended sensor outputs before conditioning amplifiers. Use Value: Clamps sub-100 ns ESD pulses to safe levels while maintaining <1 pF junction capacitance - no signal integrity impact. |
| Telecom DC Power Input Protection | Consumer Device USB Power Path Protection |
Use Scenario: Safeguarding 24–48 V DC inputs of PoE-powered network switches and base stations against lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS on main DC input bus, coordinated with upstream fuses and secondary-stage TVS arrays. Use Value: Absorbs 500 W surges without degradation, validated for repeated 10/1000 μs events per IEC 61000-4-5. |
Use Scenario: Overvoltage protection on 5 V USB VBUS lines in portable docking stations and multi-port chargers. IC Role / Device Role / Timing Role: Secondary clamping device after primary fuse, guarding USB controller ICs and power switches. Use Value: Fast response (<1 ns) and low leakage (<1 μA at 28 V) prevent false triggering and standby power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J28AHE3_A/I | Same electrical specs, but RoHS-compliant commercial grade (not halogen-free); lacks AEC-Q101 qualification. | Approved for industrial/commercial use only; not suitable for automotive under-hood deployment. | Select SMA5J28AHM3_A/I when halogen-free content and automotive qualification are mandatory. |
| SMCJ28A | Higher PPPM (1500 W), larger SMC (DO-214AB) package; same VWM/VBR/VC ratings. | Requires larger PCB footprint and different pad layout; better suited for higher-energy surge environments. | Choose SMA5J28AHM3_A/I where space-constrained layouts and AEC-Q101 compliance outweigh need for >500 W rating. |
Compared with SMA5J28AHE3_A/I and SMCJ28A, the SMA5J28AHM3_A/I uniquely combines halogen-free construction, AEC-Q101 qualification, and SMA footprint - making it optimal for space-limited automotive modules requiring full environmental and reliability certification.
Availability
SMA5J28AHM3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom power supplies, and consumer USB power delivery systems requiring stable component supply across extended production lifecycles.
Supply support for SMA5J28AHM3_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, TVS devices, and optoelectronics with emphasis on reliability and application-specific performance.
The SMA5J series is engineered for high-power-density transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where compact size, AEC-Q101 compliance, and repeatable clamping behavior are critical.
FAQ
What is the clamping voltage of the SMA5J28AHM3_A/I under a 10/1000 μs surge?
The SMA5J28AHM3_A/I has a maximum clamping voltage (VC) of 45.4 V at 11.0 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured under standardized test conditions with the device mounted on 0.2" × 0.2" copper pads and represents the upper limit of voltage seen by protected circuitry during a defined transient event. The SMA5J28AHM3_A/I maintains this clamping performance consistently across its qualified operating temperature range.
Is the SMA5J28AHM3_A/I suitable for automotive applications?
Yes, the SMA5J28AHM3_A/I is AEC-Q101 qualified and specifically designed for automotive use - confirmed by its "HM3" suffix (halogen-free + RoHS + AEC-Q101) and revision code "A/I". It supports junction temperatures up to 150 °C and passes stress tests including temperature cycling, high-temperature reverse bias, and ESD per the AEC-Q101 standard. The SMA5J28AHM3_A/I is commonly deployed in engine control units, body control modules, and ADAS power supplies.
What does the "HM3_A/I" suffix indicate in SMA5J28AHM3_A/I?
The "HM3" denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction; "A" is the revision code for the device's internal design iteration; "I" specifies the packaging format - 13" diameter tape-and-reel with 7500 units per reel. This full suffix confirms that the SMA5J28AHM3_A/I meets automotive reliability standards and environmental regulations without requiring additional material declarations or qualification retesting.
How does the SMA5J28AHM3_A/I compare to SMA5J28A-E3/61 in terms of compliance?
The SMA5J28AHM3_A/I is halogen-free and AEC-Q101 qualified, whereas SMA5J28A-E3/61 is RoHS-compliant commercial grade only (no halogen-free statement or automotive qualification). Both share identical electrical parameters (VWM = 28 V, VC = 45.4 V), but the SMA5J28AHM3_A/I adds automotive-grade reliability and environmental compliance required for Tier 1 automotive supply chains - a distinction clearly encoded in the part numbering.
What is the thermal resistance of the SMA5J28AHM3_A/I, and how does it affect layout?
The SMA5J28AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads per terminal. This value means that without additional copper pour or thermal vias, power dissipation above ~0.625 W in steady state will raise junction temperature significantly. For reliable surge handling, PCB layout must follow Vishay's recommended pad dimensions and avoid excessive trace length or narrow connections to maintain thermal performance and clamping consistency. The SMA5J28AHM3_A/I relies on proper board-level thermal design to sustain repeated transient events.
SMA5J28AHM3_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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA5J28AHM3_A/I FAQ
1.How can I place an order for SMA5J28AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J28AHM3_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 SMA5J28AHM3_A/I reliable?
The price and inventory of SMA5J28AHM3_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 SMA5J28AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMA5J28AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J28AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J28AHM3_A/I?
SMA5J28AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J28AHM3_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 SMA5J28AHM3_A/I?
For technical support, including SMA5J28AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J28AHM3_A/I requirements.
6.How does Aetrix verify that SMA5J28AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMA5J28AHM3_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 SMA5J28AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMA5J28AHM3_A/I?
All SMA5J28AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J28AHM3_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 SMA5J28AHM3_A/I part is unused and in its original packaging.
Return procedure for SMA5J28AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA5J28AHM3_A/I Tags
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