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Vishay General Semiconductor - Diodes Division SMAJ28CAHE3/5A
- Part No.:
- SMAJ28CAHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ28CAHE3/5A.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,597
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Product details
Overview
SMAJ28CAHE3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust ESD and surge protection on signal/power lines. It features 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 45.4 V maximum clamping voltage (VC) at 8.8 A peak pulse current, and 400 W peak pulse power rating (10/1000 μs waveform). It is AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ28CAHE3/5A datasheet, SMAJ28CAHE3/5A pinout, SMAJ28CAHE3/5A application, or SMAJ28CAHE3/5A equivalent, key selection criteria include bidirectional clamping behavior, 45.4 V clamping threshold at rated surge current, AEC-Q101 qualification status, RoHS-compliant matte tin terminations, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping performance in forward and reverse directions - critical for AC-coupled or floating signal lines. Its glass-passivated junction ensures stable leakage (<1.0 μA at 28 V) and fast response time (<1 ns), enabling suppression of ESD events (IEC 61000-4-2) and inductive switching transients.
The device uses a low-inductance SMA (DO-214AC) surface-mount package with thermal resistance RθJA = 120 °C/W and RθJL = 30 °C/W, supporting reliable operation up to TJ = +150 °C. Its 400 W peak pulse power rating applies below 78 V; above that, derating to 300 W per Vishay's specification curve.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working margin for 24 V nominal systems. |
| VBR (min/max) | 31.1 V / 34.4 V at IT = 1 mA - Confirmed breakdown range ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 45.4 V at 8.8 A - Clamping voltage limits downstream component stress during 10/1000 μs surge; enables robust protection of 3.3 V/5 V logic interfaces. |
| PPPM | 400 W (10/1000 μs) - Peak surge energy handling capacity suitable for automotive load-dump and ISO 7637-2 Pulse 1/2a/5a compliance. |
| IFSM | 40 A (8.3 ms half-sine) - Surge current rating supports unidirectional surge immunity; not applicable to bidirectional SMAJ28CA but confirms junction ruggedness. |
| TJ max. | +150 °C - Junction temperature limit compatible with under-hood automotive environments and industrial enclosures. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking - symmetrical terminals enable orientation-agnostic PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; clamps voltage between them when differential exceeds VBR, eliminating need for orientation-aware placement. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC signals, differential buses (e.g., RS-485), and floating sensors without polarity constraints. |
| AEC-Q101 qualification | Validates reliability for automotive powertrain, body electronics, and ADAS modules requiring zero-defect field performance. |
| Glass passivated junction | Ensures stable leakage current (<1.0 μA at VWM) and long-term parameter stability under thermal cycling. |
| MSL Level 1 (260 °C peak) | Supports lead-free reflow soldering without preconditioning; compatible with standard SMT assembly lines. |
| Matte tin terminations | Guarantees solderability per J-STD-002 and whisker resistance per JESD 201 Class 2 for high-reliability applications. |
Applications
| Automotive Sensor Interface Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN transceiver inputs and analog sensor outputs (e.g., pressure, temperature) from load dump and ESD in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed directly at connector entry point to shunt transients before reaching signal conditioning circuitry. Use Value: Limits voltage excursion to ≤45.4 V during 8.8 A surge, preserving integrity of 3.3 V/5 V microcontrollers and ADC front-ends in harsh 12 V/24 V systems. |
Use Scenario: Safeguarding digital input/output channels on programmable logic controllers exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected across each I/O line and ground to absorb repetitive 400 W surges without degradation. Use Value: Maintains <1.0 μA leakage at 28 V standby, preventing false triggering while clamping transients within 1 ns to protect optocouplers and level shifters. |
| Consumer Power Adapter Input Stage | Telecom Line Card Surge Suppression |
|
Use Scenario: Secondary-side overvoltage protection in AC/DC adapters for USB-C PD and smart home hubs subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional clamp across DC output rails to suppress common-mode transients entering via shared ground paths. Use Value: Delivers 400 W pulse handling with 120 °C/W thermal resistance, enabling compact layout without heatsinking in space-constrained adapter PCBs. |
Use Scenario: Front-end protection for Ethernet PHYs and DSL line drivers in telecom base stations and CPE equipment. IC Role / Device Role / Timing Role: Differential-mode TVS placed across twisted-pair inputs to clamp mode conversion transients per ITU-T K.20/K.44 standards. Use Value: Symmetrical VBR (31.1–34.4 V) ensures balanced clamping on both conductors, minimizing signal distortion during surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28CA-M3/5A | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free materials are mandated by environmental policy. | Choose SMAJ28CA-M3/5A when halogen-free compliance is required; otherwise SMAJ28CAHE3/5A satisfies standard automotive and industrial requirements. |
| SMCJ28CAHE3/5A | Same VWM/VC but higher 1500 W peak pulse power (SMB package); larger footprint and higher thermal mass. | Used where higher surge immunity (e.g., ISO 7637-2 Pulse 5b) is needed beyond 400 W capability. | Select SMAJ28CAHE3/5A for space-constrained designs needing 400 W protection; choose SMCJ28CAHE3/5A only when >1 kW surge rating is verified necessary. |
Compared with SMAJ28CA-M3/5A, the SMAJ28CAHE3/5A offers identical protection performance with standard RoHS compliance; compared with SMCJ28CAHE3/5A, it trades 1100 W lower pulse power for 40 % smaller PCB area and compatibility with fine-pitch SMT processes.
Availability
SMAJ28CAHE3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line card designs requiring stable component supply, AEC-Q101 validation, and RoHS-compliant manufacturing.
Supply support for SMAJ28CAHE3/5A 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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-speed transient suppression in automotive, industrial, and communications systems - prioritizing low clamping voltage, fast response, and qualification-grade consistency across temperature and life cycles.
FAQ
What is the clamping voltage of SMAJ28CAHE3/5A at its rated peak pulse current?
The SMAJ28CAHE3/5A has a maximum clamping voltage (VC) of 45.4 V at 8.8 A peak pulse current (IPPM) under a 10/1000 μs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ28CAHE3/5A maintains this clamping performance bidirectionally, making it suitable for protecting balanced signal paths in automotive and industrial applications.
Is SMAJ28CAHE3/5A suitable for automotive applications?
Yes, SMAJ28CAHE3/5A is AEC-Q101 qualified and explicitly designated for automotive use with ordering code suffix "HE3". It meets stress tests including temperature cycling, high-temperature reverse bias, and ESD per AEC standard, and is rated for operation from –55 °C to +150 °C. Its 28 V stand-off voltage aligns with 24 V system architectures, and its 45.4 V clamping threshold protects downstream 3.3 V/5 V logic in ECUs, body control modules, and ADAS sensors.
How does the bidirectional configuration of SMAJ28CAHE3/5A affect PCB layout?
The SMAJ28CAHE3/5A has no polarity marking and functions identically in both directions, allowing unrestricted orientation during automated placement. This eliminates orientation verification steps, reduces assembly errors, and simplifies routing for differential or floating nodes - such as RS-485 lines, transformer-coupled interfaces, or sensor bridges. Its SMA (DO-214AC) package requires only two 0.2" × 0.2" copper pads per terminal, with no cathode band alignment needed.
What is the maximum leakage current of SMAJ28CAHE3/5A at its stand-off voltage?
The SMAJ28CAHE3/5A exhibits a maximum reverse leakage current (ID) of 1.0 μA at its 28 V stand-off voltage (VWM) and 25 °C ambient temperature. This low leakage ensures minimal power loss and avoids false triggering in high-impedance sensing circuits. Leakage remains stable across temperature due to the device's glass-passivated junction and is verified per ANSI/IEEE C62.35 standards referenced in the Vishay datasheet.
Does SMAJ28CAHE3/5A require derating above 25 °C ambient temperature?
Yes, SMAJ28CAHE3/5A must be derated above 25 °C ambient per Figure 2 in the Vishay datasheet. Its peak pulse power rating drops linearly from 400 W at 25 °C to zero at approximately 150 °C junction temperature. Derating is governed by thermal resistance RθJA = 120 °C/W; actual usable power depends on PCB copper area, airflow, and adjacent heat sources. For sustained operation, junction temperature must remain ≤150 °C, and design margins should account for worst-case thermal conditions.
SMAJ28CAHE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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):
- 8.8A
- Power - Peak Pulse:
- 400W
- 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)
SMAJ28CAHE3/5A FAQ
1.How can I place an order for SMAJ28CAHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ28CAHE3/5A 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 SMAJ28CAHE3/5A reliable?
The price and inventory of SMAJ28CAHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ28CAHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ28CAHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ28CAHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ28CAHE3/5A?
SMAJ28CAHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ28CAHE3/5A 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 SMAJ28CAHE3/5A?
For technical support, including SMAJ28CAHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ28CAHE3/5A requirements.
6.How does Aetrix verify that SMAJ28CAHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ28CAHE3/5A 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 SMAJ28CAHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ28CAHE3/5A?
All SMAJ28CAHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ28CAHE3/5A, 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 SMAJ28CAHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ28CAHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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