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Vishay General Semiconductor - Diodes Division SMA5J28CA-M3/5A
- Part No.:
- SMA5J28CA-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J28CA-M3/5A.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,779
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Product details
Overview
SMA5J28CA-M3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on signal and power lines. It features a 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR), 45.4 V clamping voltage (VC) at 11.0 A peak pulse current, and 500 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMA5J28CA-M3/5A datasheet, SMA5J28CA-M3/5A pinout, SMA5J28CA-M3/5A application, or SMA5J28CA-M3/5A equivalent, key selection criteria include bidirectional clamping capability, halogen-free RoHS compliance (M3 suffix), AEC-Q101 qualification eligibility, and thermal resistance (RθJA = 80 °C/W) under PCB pad-limited dissipation.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, with clamping action triggered when reverse or forward transients exceed VWM = 28 V. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 µA at VWM), while fast response time (<1 ns) enables protection of sensitive MOSFET gates and microcontroller I/O pins.
The device sustains non-repetitive 10/1000 µs surges up to 500 W without degradation, with thermal performance defined by RθJA = 80 °C/W (on 5.0 mm × 5.0 mm copper pads) and maximum junction temperature of 150 °C - supporting operation in under-hood automotive environments and industrial control cabinets.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal swing range for protected line. |
| VBR (min/max) | 31.1 V / 34.4 V at 1.0 mA - Confirmed breakdown threshold range ensuring reliable turn-on across process variation and temperature. |
| VC @ IPPM | 45.4 V at 11.0 A - Clamped voltage during 500 W surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 500 W - Peak pulse power handling with 10/1000 µs waveform; validates robustness against lightning-induced and inductive-switching transients. |
| IPPM | 11.0 A - Peak surge current corresponding to VC; used to size series impedance and verify PCB trace survival. |
| RθJA | 80 °C/W - Junction-to-ambient thermal resistance on standard 5.0 mm × 5.0 mm pads; critical for thermal derating above 25 °C ambient. |
| TJ max | 150 °C - Maximum allowable junction temperature; sets upper limit for sustained surge repetition rate and ambient operating envelope. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant (M3 suffix), unmarked bidirectional configuration - no polarity band; terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional surge conduction path | No fixed polarity - either terminal serves as anode or cathode depending on transient polarity; enables single-device protection of AC or floating lines. |
| Case (body) | Thermal and mechanical interface | Plastic-molded body with UL 94 V-0 rating; transfers heat to PCB copper pads; requires minimum 5.0 mm × 5.0 mm pad area per terminal for rated power dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled, differential, or floating signal lines without polarity concerns - e.g., CAN bus, RS-485, sensor bridges. |
| Glass-passivated junction | Ensures stable VBR tolerance and low leakage (<1.0 µA) over lifetime and temperature, critical for battery-powered and high-impedance sensor front-ends. |
| 500 W peak pulse rating | Withstands IEC 61000-4-5 Level 4 (4 kV surge) and ISO 7637-2 Pulse 1/2a/3a waveforms when properly mounted - validated for automotive ECU I/O protection. |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles without preconditioning; eliminates moisture-related popcorning risk during assembly. |
| AEC-Q101 qualification path | M3 suffix supports automotive-grade sourcing; full qualification available via HM3 ordering code - required for engine control, ADAS, and body electronics applications. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting analog and digital sensor outputs (e.g., pressure, temperature, position sensors) in engine control modules from load dump and inductive kickback. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor output and microcontroller ADC input or digital buffer. Use Value: Limits transient voltage to ≤45.4 V, preventing latch-up or gate oxide damage in 3.3 V/5 V MCUs while maintaining signal integrity below 28 V DC operating range. |
Use Scenario: Safeguarding PLC digital input channels connected to 24 V industrial field devices subject to relay contact bounce and solenoid switching noise. IC Role / Device Role / Timing Role: Standoff protector on dry-contact or PNP/NPN input circuitry, shunting surges before they reach optocoupler or level-shifter ICs. Use Value: Absorbs 500 W surges without degradation, enabling >100,000-cycle reliability in factory automation systems with minimal board space (SMA footprint). |
| Telecom Line Interface | Consumer USB/Display Port ESD |
Use Scenario: Secondary protection on Ethernet PHY or xDSL line drivers exposed to induced surges from nearby power lines or lightning coupling. IC Role / Device Role / Timing Role: Coordinated clamp staged after primary gas discharge tube (GDT), limiting let-through voltage to PHY transceivers. Use Value: Fast <1 ns response complements slower GDTs; 45.4 V clamping ensures compliance with IEEE 802.3af PoE voltage limits during surge events. |
Use Scenario: Board-level ESD and surge protection for USB 2.0 data lines and DisplayPort AUX channels in laptops and docking stations. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed directly at connector, upstream of USB transceiver or DP retimer IC. Use Value: Maintains signal integrity with minimal added capacitance (typ. <100 pF), while clamping ±8 kV contact ESD per IEC 61000-4-2 to safe levels for 1.2 V/1.8 V PHYs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J28CA-E3/5A | Same electrical specs and package; RoHS-compliant but not halogen-free (E3 vs M3); no AEC-Q101 path. | Approved for commercial/industrial use only; not suitable for automotive programs requiring halogen-free or AEC-Q101 documentation. | Select SMA5J28CA-E3/5A only for cost-sensitive non-automotive designs where halogen content is unrestricted. |
| SMA6J28CA-M3/5A | Higher 600 W PPPM rating; identical VWM, VBR, VC, and package; same M3 halogen-free RoHS status. | Supports more severe surge environments (e.g., heavy-duty vehicle alternator load dump, outdoor telecom enclosures) without layout change. | Choose SMA6J28CA-M3/5A when system-level testing exceeds 500 W surge margin or when future-proofing against higher immunity standards. |
Compared with SMA5J28CA-E3/5A, the SMA5J28CA-M3/5A adds halogen-free compliance and AEC-Q101 qualification readiness; versus SMA6J28CA-M3/5A, it trades 100 W surge headroom for tighter cost and supply chain alignment in mid-tier automotive and industrial applications.
Availability
SMA5J28CA-M3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial digital I/O protection, and telecom line interface circuits requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification support.
Supply support for SMA5J28CA-M3/5A 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, MOSFETs, and optoelectronics with emphasis on reliability, power density, and automotive-grade qualification.
The SMA5J series is engineered for high-power-density transient suppression in space-constrained, high-reliability applications - particularly targeting automotive ECUs, industrial PLCs, and communication infrastructure where bidirectional surge immunity and thermal stability are critical.
FAQ
What is the clamping voltage of the SMA5J28CA-M3/5A under a 500 W surge?
The SMA5J28CA-M3/5A clamps to 45.4 V at its rated peak pulse current of 11.0 A, which corresponds to a 10/1000 µs waveform delivering 500 W. This value is measured per JEDEC test conditions with the device mounted on 5.0 mm × 5.0 mm copper pads. The SMA5J28CA-M3/5A maintains this clamping performance across its specified operating temperature range of -55 °C to +150 °C.
Is the SMA5J28CA-M3/5A suitable for automotive applications?
Yes - the SMA5J28CA-M3/5A uses Vishay's halogen-free, RoHS-compliant M3 construction and is eligible for AEC-Q101 qualification via the HM3 ordering variant. Its 150 °C maximum junction temperature, 500 W surge rating, and bidirectional symmetry make it appropriate for engine bay sensors, body control modules, and infotainment I/O protection. The SMA5J28CA-M3/5A meets MSL Level 1 for lead-free reflow compatibility.
How does the SMA5J28CA-M3/5A differ from unidirectional variants like SMA5J28A-M3/5A?
The SMA5J28CA-M3/5A is bidirectional with symmetrical clamping in both polarities and no polarity marking, whereas SMA5J28A-M3/5A is unidirectional with a cathode band and conducts only in reverse bias. The SMA5J28CA-M3/5A has identical VWM (28 V), VBR, and VC ratings but supports AC or floating-line protection without external polarity management - essential for differential buses and transformer-coupled interfaces.
What is the maximum leakage current of the SMA5J28CA-M3/5A at its stand-off voltage?
The SMA5J28CA-M3/5A exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 28 V stand-off voltage (VWM), measured at 25 °C. This low leakage preserves signal integrity in high-impedance sensor paths and minimizes standby power loss in battery-operated systems. The SMA5J28CA-M3/5A maintains leakage below 5.0 µA across its full -55 °C to +125 °C operating range.
Does the SMA5J28CA-M3/5A require special PCB layout considerations?
Yes - to achieve its rated 500 W pulse power, the SMA5J28CA-M3/5A must be mounted on minimum 5.0 mm × 5.0 mm copper pads per terminal, per Vishay's thermal characterization. Trace width and copper weight should support ≥11.0 A transient current without fusing. Avoid thermal reliefs on pads, and ensure ground/power planes provide adequate heat spreading. The SMA5J28CA-M3/5A thermal resistance degrades significantly with smaller pads.
SMA5J28CA-M3/5A 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:
- -
- Bidirectional Channels:
- 1
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA5J28CA-M3/5A FAQ
1.How can I place an order for SMA5J28CA-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J28CA-M3/5A 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 SMA5J28CA-M3/5A reliable?
The price and inventory of SMA5J28CA-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J28CA-M3/5A is usually 5 days.
3.What payment methods are accepted for SMA5J28CA-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J28CA-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J28CA-M3/5A?
SMA5J28CA-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J28CA-M3/5A 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 SMA5J28CA-M3/5A?
For technical support, including SMA5J28CA-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J28CA-M3/5A requirements.
6.How does Aetrix verify that SMA5J28CA-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMA5J28CA-M3/5A 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 SMA5J28CA-M3/5A meets industry standards.
7.What is the process for return or replacement of SMA5J28CA-M3/5A?
All SMA5J28CA-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J28CA-M3/5A, 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 SMA5J28CA-M3/5A part is unused and in its original packaging.
Return procedure for SMA5J28CA-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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