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Vishay General Semiconductor - Diodes Division SMAJ28C-E3/5A
- Part No.:
- SMAJ28C-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ28C-E3/5A.pdf
- Description:
- TVS DIODE 28VWM 50VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ28C-E3/5A from Vishay General Semiconductor is a bi-directional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping voltage transients on signal or power lines. It features 28 V stand-off voltage (VWM), 50.0 V maximum clamping voltage (VC) at 8.0 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 µs waveform), making it suitable for protecting I/O ports and sensor interfaces in industrial control systems.
For engineers reviewing the SMAJ28C-E3/5A datasheet, SMAJ28C-E3/5A pinout, SMAJ28C-E3/5A application, or SMAJ28C-E3/5A equivalent, key selection criteria include bi-directional surge suppression capability, low clamping ratio (VC/VWM = 1.79), RoHS-compliant matte tin terminals, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This bi-directional TVS operates symmetrically in both polarities, with breakdown voltage (VBR) specified at 31.1–38.0 V (1 mA test current), enabling robust protection against bipolar transients such as ESD and lightning-induced surges. Its glass-passivated junction ensures stable leakage performance and fast response time (<1 ps), critical for safeguarding high-speed analog and digital signal paths.
The device exhibits low incremental surge resistance and thermal resistance (RθJA = 120 °C/W, RθJL = 30 °C/W), supporting reliable operation under repetitive surge conditions when mounted on 0.2 × 0.2" (5.0 × 5.0 mm) copper pads per terminal. It meets J-STD-020 MSL Level 1 and withstands solder reflow up to 260 °C for 40 s.
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. |
| VC @ IPPM | 50.0 V - Clamped voltage at 8.0 A peak pulse current; limits downstream IC stress during 10/1000 µs transients. |
| IPPM | 8.0 A - Peak surge current handling capacity under standardized 10/1000 µs waveform; determines minimum trace width and layout robustness. |
| PPPM | 400 W - Peak pulse power dissipation capability; enables protection against IEC 61000-4-5 Level 3 (1 kV/42 Ω) surges. |
| ID @ VWM | 1.0 µA - Reverse leakage at stand-off voltage; ensures negligible standby power loss in battery-powered sensor nodes. |
| TJ Range | −55 to +150 °C - Operating junction temperature range; supports deployment in automotive engine compartments and industrial enclosures. |
| Package | DO-214AC (SMA) - Surface-mount outline with 2.54 mm lead pitch; compatible with standard pick-and-place equipment and reflow profiles. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with two unmarked leads; bi-directional symmetry means no polarity marking required. Terminals are matte tin plated, solderable per J-STD-002 and JESD22-B102, and qualified to JESD201 Class 1A whisker test.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional transient conduction path | Both terminals function identically; connects across protected line and ground (or between differential lines) without orientation constraint. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN, USB D+/D−) without polarity concerns. |
| 400 W peak pulse power | Supports compliance with IEC 61000-4-5 surge immunity testing up to 1 kV open-circuit voltage in 2 Ω/12 Ω source impedance configurations. |
| Low clamping ratio (1.79) | Minimizes overvoltage exposure to protected ICs-critical for 3.3 V or 5 V logic interfacing with 24 V field wiring. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow processing without baking; reduces manufacturing overhead in high-volume SMT lines. |
| RoHS-compliant & AEC-Q200 ready | Meets environmental compliance requirements and demonstrates reliability suitability for automotive body electronics and industrial PLC I/O modules. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting 4–20 mA current loop transmitters and analog voltage inputs from load dump and inductive switching spikes in factory automation cabinets. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed across input terminals to limit transient excursions to ≤50 V, preserving ADC front-end integrity. Use Value: Prevents latch-up or permanent damage to precision op-amps and SAR ADCs during 100 V/100 ms load dump events. |
Use Scenario: Safeguarding LIN bus transceivers and door module microcontrollers from battery reverse connection and alternator ripple surges. IC Role / Device Role / Timing Role: Standoff-clamp element connected between LIN line and chassis ground, responding within <1 ps to suppress >100 V transients. Use Value: Maintains communication continuity during ISO 7637-2 Pulse 1/2a/5a tests without requiring system reset or firmware recovery. |
| Telecom Power Feeding Port | Consumer Appliance Motor Driver |
|
Use Scenario: Shielding PoE-powered Ethernet PHYs and DC-DC converters from induced surges on 48 V phantom power lines in IP cameras and wireless access points. IC Role / Device Role / Timing Role: Primary overvoltage limiter on secondary-side 48 V rail, coordinated with upstream MOV and fuse for staged protection. Use Value: Limits clamped energy to <10 mJ per event, avoiding thermal runaway in adjacent ceramic capacitors and regulator ICs. |
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: Snubber-grade TVS placed across motor terminals to absorb inductive kickback before it reaches H-bridge MOSFETs or MCU pins. Use Value: Reduces radiated emissions by >10 dBµV in 30–230 MHz band and eliminates false resets caused by >2 kV EFT bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bi-directional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28CA-E3/5A | Identical electrical specs and packaging; CA suffix denotes same bi-directional construction as C suffix per Vishay documentation. | No functional difference; CA and C are interchangeable per Vishay's ordering matrix and device marking code table. | Select SMAJ28CA-E3/5A only if legacy BOM specifies CA; otherwise SMAJ28C-E3/5A is preferred due to broader distributor stock visibility. |
| SMCJ28CA | Higher power rating (1500 W vs. 400 W), larger DO-214AB (SMB) package, 53.3 V clamping voltage at 28.3 A. | Suitable for higher-energy threats (e.g., IEC 61000-4-5 Level 4), but requires larger PCB area and may over-specify for 24 V I/O protection. | Choose SMCJ28CA only when surge threat level exceeds 1.5 kV or when system-level testing mandates >1 kW pulse handling. |
Compared with SMAJ28CA-E3/5A (functionally identical) and SMCJ28CA (higher-power, larger footprint), SMAJ28C-E3/5A delivers optimal cost, size, and performance balance for 24 V industrial I/O protection where 400 W pulse capability suffices and board space is constrained.
Availability
SMAJ28C-E3/5A is available at Aetrix Electronics and suitable for industrial sensor interface, automotive body control module, and telecom power feeding port applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for SMAJ28C-E3/5A 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, MOSFETs, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for robust transient suppression in harsh environments-targeting industrial automation, automotive subsystems, and telecom infrastructure where compact, high-reliability TVS protection is mission-critical.
FAQ
What is the clamping voltage of SMAJ28C-E3/5A at its rated peak pulse current?
The SMAJ28C-E3/5A has a maximum clamping voltage (VC) of 50.0 V at 8.0 A peak pulse current (IPPM) under a 10/1000 µs waveform. This value is measured per Fig. 1 and Fig. 3 in Vishay document 88390 and defines the upper voltage limit imposed on protected circuitry during surge events. The clamping performance remains consistent across both polarities due to its bi-directional design.
Is SMAJ28C-E3/5A suitable for automotive applications?
Yes, SMAJ28C-E3/5A meets RoHS requirements and is constructed using processes aligned with AEC-Q200 stress testing guidelines for passive components. While not AEC-Q101 qualified (which applies to discrete semiconductors like the HE3-grade variants), its thermal stability (TJ = −55 to +150 °C), MSL Level 1 rating, and robust surge capability make it widely deployed in non-safety-critical automotive body electronics such as mirror controls and lighting modules.
How does the bi-directional nature of SMAJ28C-E3/5A affect PCB layout?
The bi-directional architecture of SMAJ28C-E3/5A eliminates polarity constraints-no cathode band marking is present, and either terminal may connect to line or ground. This simplifies layout by removing orientation checks during placement and allows use in differential signal protection (e.g., RS-485) without additional routing complexity. Mounting requires symmetric 0.2 × 0.2" copper pads per lead to maintain specified thermal and surge performance.
What is the maximum reverse leakage current for SMAJ28C-E3/5A at its stand-off voltage?
At 28 V stand-off voltage (VWM) and 25 °C ambient temperature, SMAJ28C-E3/5A exhibits a maximum reverse leakage current (ID) of 1.0 µA. This ultra-low leakage ensures minimal impact on high-impedance sensor circuits and battery-operated devices, preserving signal integrity and extending operational runtime without introducing measurable error or drain.
Can SMAJ28C-E3/5A be used in place of a uni-directional TVS like SMAJ28A-E3/5A?
No-SMAJ28C-E3/5A is bi-directional and lacks polarity marking, while SMAJ28A-E3/5A is uni-directional with a cathode band. Substituting them requires verifying circuit topology: SMAJ28C-E3/5A is appropriate for AC or floating lines (e.g., data buses), whereas SMAJ28A-E3/5A must be oriented correctly for DC-biased rails. Interchangeability is not permitted without redesigning protection placement and validating clamping behavior under negative transients.
SMAJ28C-E3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 50V
- Current - Peak Pulse (10/1000µs):
- 8A
- Power - Peak Pulse:
- 400W
- 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)
SMAJ28C-E3/5A FAQ
1.How can I place an order for SMAJ28C-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ28C-E3/5A 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 SMAJ28C-E3/5A reliable?
The price and inventory of SMAJ28C-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ28C-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ28C-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ28C-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ28C-E3/5A?
SMAJ28C-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ28C-E3/5A 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 SMAJ28C-E3/5A?
For technical support, including SMAJ28C-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ28C-E3/5A requirements.
6.How does Aetrix verify that SMAJ28C-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ28C-E3/5A 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 SMAJ28C-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ28C-E3/5A?
All SMAJ28C-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ28C-E3/5A, 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 SMAJ28C-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ28C-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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