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Vishay General Semiconductor - Diodes Division SMA5J28CAHM3_A/H
- Part No.:
- SMA5J28CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J28CAHM3_A/H.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,410
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Product details
Overview
SMA5J28CAHM3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR), 45.4 V maximum clamping voltage (VC) at 11.0 A peak pulse current, and 500 W peak pulse power rating - used in automotive sensor protection and industrial I/O interface surge suppression.
For engineers reviewing the SMA5J28CAHM3_A/H datasheet, SMA5J28CAHM3_A/H pinout, SMA5J28CAHM3_A/H application, or SMA5J28CAHM3_A/H equivalent, key selection criteria include bidirectional polarity, AEC-Q101 qualification (via HM3 suffix), 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamping protector using an avalanche breakdown mechanism, with symmetrical reverse/forward conduction enabling bidirectional transient suppression without polarity sensitivity. Its glass-passivated junction ensures stable leakage performance (<1.0 μA at VWM) and fast response time (<1.0 ps), critical for protecting MOSFET gates and microcontroller I/O pins against ESD and inductive switching spikes.
The SMA5J28CAHM3_A/H is thermally rated for TJ = –55 °C to +150 °C and exhibits RθJA = 80 °C/W and RθJL = 25 °C/W, supporting reliable operation under repetitive surge conditions when mounted per recommended pad layout. It meets J-STD-020 MSL Level 1 and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working range for protected line. |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - Confirmed breakdown threshold range ensuring predictable turn-on during transients. |
| VC @ IPPM | 45.4 V at 11.0 A - Clamped voltage seen by downstream circuitry during 10/1000 μs surge; limits stress on IC inputs. |
| PPPM | 500 W - Peak pulse power handling capacity under standardized 10/1000 μs waveform; determines survivability of lightning or load-dump events. |
| IPPM | 11.0 A - Maximum non-repetitive surge current supported before degradation; derived from VC and PPPM. |
| TJ max. | +150 °C - Maximum junction temperature enabling use in under-hood automotive and high-ambient industrial environments. |
| Leakage (ID) | <1.0 μA at 28 V - Ultra-low reverse leakage preserves signal integrity and battery life in always-on circuits. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Bidirectional construction means no polarity marking; both terminals are functionally identical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient path | Either terminal serves as input/output for surge current; no cathode band marking required. |
| Case (body) | Thermal and mechanical interface | Plastic body provides electrical isolation; thermal path relies on PCB copper pads (0.2" × 0.2" per terminal recommended). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HAST, and surge endurance - enables use in ADAS sensors and body control modules. |
| Glass-passivated junction | Ensures stable VBR tolerance and low leakage over lifetime, even under humidity and thermal stress. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a), improving protection margin for 3.3 V/5 V logic. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without pre-baking, reducing manufacturing complexity. |
| 500 W peak pulse power | Supports robust protection against IEC 61000-4-5 Level 4 (4 kV line-to-line) surges in industrial PLC I/O modules. |
Applications
| Automotive Sensor Protection | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from load dump and jump-start transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between signal line and ground, absorbing energy before it reaches sensitive analog front-end or transceiver ICs. Use Value: Enables compliance with ISO 16750-2 (12 V system load dump up to 35 V) while maintaining <1.0 μA leakage to avoid sensor offset errors. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input terminal block, shunting transient energy to common ground before reaching optocoupler or Schmitt trigger input stage. Use Value: Withstands repeated 500 W surges per IEC 61000-4-4 (EFT) and maintains VC ≤ 45.4 V to prevent latch-up in downstream logic. |
| Telecom Power Rail Protection | Consumer Appliance Motor Control |
Use Scenario: Guarding 48 V PoE-powered Ethernet switch ports and base station RF front-end bias rails against lightning-induced surges. IC Role / Device Role / Timing Role: Secondary-level TVS on DC supply rail upstream of DC/DC converters, limiting voltage excursions during fast transients. Use Value: 31.1–34.4 V VBR ensures clamping initiates before 48 V rail exceeds converter overvoltage lockout thresholds. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machines and HVAC blowers connected to microcontroller GPIOs. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF typical) bidirectional clamp across motor driver half-bridge outputs or feedback sensing lines. Use Value: Fast response (<1 ps) and symmetrical clamping prevent false triggering of overcurrent detection while preserving PWM timing integrity. |
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_A/H | Same electrical specs and package; RoHS-compliant but not halogen-free or AEC-Q101 qualified. | Approved for commercial/industrial use only; excluded from automotive production where halogen-free and AEC-Q101 are mandatory. | Select when cost-sensitive commercial designs require same clamping performance without automotive qualification. |
| SMA6J28CAHM3_A/H | 600 W PPPM, higher IPPM (13.3 A), identical VWM/VC; same package and AEC-Q101/HM3 status. | Used where higher surge immunity (e.g., ISO 7637-2 Pulse 5a) is required without changing PCB layout. | Choose for enhanced surge margin in harsh environments while retaining drop-in compatibility and footprint. |
Compared with SMA5J28CAHM3_A/H, SMA5J28CAHE3_A/H lacks halogen-free and automotive qualification but offers identical clamping behavior for cost-driven industrial use, whereas SMA6J28CAHM3_A/H delivers 20 % higher surge power headroom with full pin-and-function compatibility.
Availability
SMA5J28CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC digital inputs, and telecom power rail protection requiring stable component supply, long-term lifecycle support, and traceable AEC-Q101 qualified sourcing.
Supply support for SMA5J28CAHM3_A/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 diodes, rectifiers, TVS devices, and power MOSFETs with emphasis on reliability, efficiency, and application-specific optimization.
The SMA5J series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in automotive, industrial, and communications systems where robustness and AEC-Q101 compliance are mandatory.
FAQ
What is the polarity configuration of SMA5J28CAHM3_A/H?
The SMA5J28CAHM3_A/H is a bidirectional TVS diode, meaning it conducts equally in both directions and has no polarity marking on the package. This allows it to protect AC-coupled lines or differential signals without regard to orientation during PCB assembly, unlike unidirectional variants that feature a cathode band.
Does SMA5J28CAHM3_A/H meet automotive qualification standards?
Yes, SMA5J28CAHM3_A/H is AEC-Q101 qualified, as confirmed by the "HM3" suffix indicating halogen-free, RoHS-compliant, and automotive-grade reliability testing. It supports use in engine control units, ADAS sensors, and body electronics where extended temperature operation and surge endurance are required.
What is the maximum clamping voltage for SMA5J28CAHM3_A/H under surge conditions?
The maximum clamping voltage (VC) for SMA5J28CAHM3_A/H is 45.4 V at 11.0 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during transient events.
How does the HM3 suffix differ from the HE3 suffix in SMA5J28CAHM3_A/H?
The HM3 suffix denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction, whereas HE3 indicates RoHS-compliant and AEC-Q101 qualified but not halogen-free. SMA5J28CAHM3_A/H therefore satisfies stricter environmental and automotive material requirements than its HE3 counterpart.
What PCB pad layout is recommended for optimal thermal performance of SMA5J28CAHM3_A/H?
Vishay specifies mounting SMA5J28CAHM3_A/H on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated thermal resistance (RθJA = 80 °C/W). Deviating from this layout reduces surge current capability and increases junction temperature during repetitive events.
SMA5J28CAHM3_A/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:
- 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:
- 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_A/H FAQ
1.How can I place an order for SMA5J28CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J28CAHM3_A/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_A/H reliable?
The price and inventory of SMA5J28CAHM3_A/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_A/H is usually 5 days.
3.What payment methods are accepted for SMA5J28CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J28CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J28CAHM3_A/H?
SMA5J28CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J28CAHM3_A/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_A/H?
For technical support, including SMA5J28CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J28CAHM3_A/H requirements.
6.How does Aetrix verify that SMA5J28CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMA5J28CAHM3_A/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_A/H meets industry standards.
7.What is the process for return or replacement of SMA5J28CAHM3_A/H?
All SMA5J28CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J28CAHM3_A/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_A/H part is unused and in its original packaging.
Return procedure for SMA5J28CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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