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Vishay General Semiconductor - Diodes Division SMA5J28CAHM3/H
- Part No.:
- SMA5J28CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J28CAHM3/H.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,724
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Product details
Overview
SMA5J28CAHM3/H 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 (10/1000 µs waveform), commonly deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMA5J28CAHM3/H datasheet, SMA5J28CAHM3/H pinout, SMA5J28CAHM3/H application, or SMA5J28CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamped crowbar during transients, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its bidirectional symmetry ensures identical clamping behavior in both polarities, with no polarity marking required on the SMA package.
Rated for -55 °C to +150 °C junction temperature, it delivers stable performance under repetitive surge stress when mounted per recommended pad layout, and meets MSL Level 1 (260 °C peak reflow) for robust manufacturing compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 31.1 V / 34.4 V at 1 mA - Verified breakdown threshold range ensuring reliable turn-on margin |
| VC @ IPPM | 45.4 V at 11.0 A - Clamped voltage during 10/1000 µs surge, limiting downstream IC stress |
| PPPM | 500 W - Peak pulse power handling capacity defines maximum transient energy absorption |
| IPPM | 11.0 A - Peak surge current supported at rated clamping voltage |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height |
Pinout & Package
Package: SMA (DO-214AC), bidirectional configuration with unmarked terminals - no cathode band or polarity indicator.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Identical bidirectional clamping behavior; either terminal serves as input or return path |
| Case (body) | Thermal and mechanical interface | Plastic-molded body with UL 94 V-0 rating; transfers heat to PCB copper pads |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Halogen-free & RoHS-compliant | Meets JEDEC JESD201 Class 2 whisker resistance and environmental compliance requirements |
| Low profile SMA package | 2.29 mm max height enables use in space-constrained modules and stacked PCB assemblies |
| Fast response time | Sub-nanosecond junction turn-on ensures protection before sensitive downstream circuitry is damaged |
| MSL Level 1 | Compatible with standard SMT reflow profiles up to 260 °C peak without preconditioning |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load-dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential or single-ended signal lines upstream of the interface IC. Use Value: Limits transient voltage to ≤45.4 V, preventing latch-up or gate oxide damage in 3.3 V/5 V automotive microcontrollers and transceivers. |
Use Scenario: Safeguarding digital input/output channels of programmable logic controllers against field-induced surges from motor drives and solenoid coils. IC Role / Device Role / Timing Role: Primary surge suppression element on 24 V DC I/O terminals, coordinated with upstream fusing and filtering. Use Value: Absorbs 500 W pulses without degradation, maintaining signal integrity during factory automation equipment commissioning and maintenance. |
| Telecom Power Line Protection | Consumer Appliance Control Board |
Use Scenario: Guarding 48 V DC power rails in PoE-powered network switches and base station RF modules against lightning-induced surges. IC Role / Device Role / Timing Role: Secondary-level TVS on bulk power entry points, working in concert with GDTs and common-mode chokes. Use Value: Clamps transients within 10/1000 µs waveform envelope while sustaining 28 V nominal rail operation without leakage or thermal runaway. |
Use Scenario: Shielding microcontroller GPIOs and display driver lines in smart home appliances (e.g., washing machines, HVAC controllers) from ESD and relay bounce. IC Role / Device Role / Timing Role: Point-of-use transient suppressor adjacent to connectors and electromechanical components. Use Value: Provides 800 µA max leakage at 28 V, minimizing standby current impact while meeting IEC 61000-4-2 Level 4 ESD immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J28CAHE3/H | Same electrical specs; RoHS-compliant but not halogen-free; lacks JESD201 Class 2 whisker resistance | Approved for commercial-grade automotive modules where halogen-free requirement is waived | Select when cost sensitivity outweighs halogen-free mandate and whisker resistance is non-critical |
| SMA6J28CAHM3/H | 600 W PPPM, same VWM/VC; larger SMA package variant with higher thermal mass | Preferred for high-reliability industrial systems requiring extended surge endurance beyond 500 W | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 and thermal derating margins are tight |
Compared with SMA5J28CAHE3/H, the SMA5J28CAHM3/H adds halogen-free construction and whisker resistance for enhanced long-term reliability in humid, high-vibration environments; versus SMA6J28CAHM3/H, it trades 100 W peak power headroom for tighter board space and lower component cost in validated 500 W applications.
Availability
SMA5J28CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O protection, and telecom power line safeguarding requiring stable component supply across multi-year production cycles.
Supply support for SMA5J28CAHM3/H 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for demanding industrial and automotive applications.
The SMA5J series was engineered specifically for high-power-density transient suppression in space-constrained, high-surge environments-emphasizing AEC-Q101 qualification, automated assembly compatibility, and consistent clamping performance across temperature.
FAQ
What does the "HM3" suffix indicate in SMA5J28CAHM3/H?
The "HM3" suffix in SMA5J28CAHM3/H denotes halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance, and AEC-Q101 qualification. It confirms compliance with automotive reliability standards and environmental regulations, distinguishing it from commercial-grade variants like "E3" or "M3" without AEC-Q101 validation.
Is SMA5J28CAHM3/H unidirectional or bidirectional?
SMA5J28CAHM3/H is a bidirectional transient voltage suppressor, as indicated by the "CA" suffix. Its electrical characteristics-including breakdown voltage, clamping voltage, and leakage current-apply identically in both directions, and it carries no polarity marking on the SMA (DO-214AC) package body.
What is the maximum clamping voltage of SMA5J28CAHM3/H under surge conditions?
The maximum clamping voltage of SMA5J28CAHM3/H is 45.4 V, measured at its peak pulse current (IPPM) of 11.0 A under a standardized 10/1000 µs waveform. This value ensures protected circuits remain below critical overvoltage thresholds during transient events.
Can SMA5J28CAHM3/H be used in place of SMA5J28A (unidirectional)?
No-SMA5J28CAHM3/H is bidirectional and lacks a defined cathode, whereas SMA5J28A is unidirectional with a marked cathode band. Substituting them requires circuit redesign to accommodate polarity-insensitive placement and verify that reverse-bias leakage and forward conduction behavior meet system requirements.
What PCB pad layout is recommended for optimal thermal performance of SMA5J28CAHM3/H?
Vishay specifies mounting SMA5J28CAHM3/H on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to ensure adequate heat dissipation. Adhering to this layout maintains thermal resistance (RθJA) near the typical 80 °C/W rating and prevents premature thermal failure during repetitive surge events.
SMA5J28CAHM3/H 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:
- -
- 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:
- 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)
SMA5J28CAHM3/H FAQ
1.How can I place an order for SMA5J28CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J28CAHM3/H 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 SMA5J28CAHM3/H reliable?
The price and inventory of SMA5J28CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J28CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMA5J28CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J28CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J28CAHM3/H?
SMA5J28CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J28CAHM3/H 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 SMA5J28CAHM3/H?
For technical support, including SMA5J28CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J28CAHM3/H requirements.
6.How does Aetrix verify that SMA5J28CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMA5J28CAHM3/H 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 SMA5J28CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMA5J28CAHM3/H?
All SMA5J28CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J28CAHM3/H, 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 SMA5J28CAHM3/H part is unused and in its original packaging.
Return procedure for SMA5J28CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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