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Vishay General Semiconductor - Diodes Division SMAJ24-E3/5A
- Part No.:
- SMAJ24-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24-E3/5A.pdf
- Description:
- TVS DIODE 24VWM 43VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,394
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Product details
Overview
SMAJ24-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning. It features a 24 V stand-off voltage (VWM), 43.0 V maximum clamping voltage (VC) at 9.3 A peak pulse current (IPPM), and 400 W peak pulse power dissipation with 10/1000 µs waveform.
For engineers reviewing the SMAJ24-E3/5A datasheet, SMAJ24-E3/5A pinout, SMAJ24-E3/5A application, or SMAJ24-E3/5A equivalent, key selection criteria include clamping performance under 10/1000 µs surge, unidirectional polarity marking, RoHS-compliant matte tin plating, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 0.2 × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamping protection device in parallel with protected circuitry, triggering when reverse voltage exceeds its breakdown threshold (26.7–32.6 V). Its glass-passivated junction ensures stable avalanche characteristics and low incremental surge resistance for consistent transient suppression.
Designed for single-polarity DC line protection, it exhibits 1.0 µA maximum reverse leakage at 24 V stand-off, supports 40 A non-repetitive forward surge current (8.3 ms half-sine), and maintains operation across –55 °C to +150 °C junction temperature range - critical for automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 26.7 V / 32.6 V - Breakdown voltage range at 1 mA test current; defines turn-on threshold tolerance |
| VC @ IPPM | 43.0 V - Clamped voltage during 9.3 A 10/1000 µs surge; determines maximum stress on downstream ICs |
| PPPM | 400 W - Peak pulse power handling capability under standard 10/1000 µs waveform |
| IPPM | 9.3 A - Maximum non-repetitive surge current supported at rated clamping voltage |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance; informs derating requirements on standard PCB pads |
| Package | DO-214AC (SMA) - Surface-mount outline with cathode band marking; compatible with J-STD-020 MSL Level 1 |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, cathode indicated by a band on one end. Designed for reflow soldering (260 °C peak, 40 s dip) and automated placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lower potential node; completes clamping path during overvoltage events |
| Cathode (banded end) | High-side transient input terminal | Connected to protected line (e.g., 24 V supply rail); avalanche conduction initiates here during reverse surge |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Enables robust protection of 24 V systems against IEC 61000-4-5 level 3 surges without derating below 78 V |
| Glass-passivated junction | Ensures stable, repeatable avalanche behavior and long-term reliability under repeated transient stress |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow without baking; simplifies manufacturing logistics |
| RoHS-compliant matte tin plating | Meets J-STD-002 and JESD22-B102 solderability standards; eliminates whisker risk (JESD 201 Class 1A) |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for downstream MOSFETs and ICs |
Applications
| Industrial Motor Control | Automotive Body Control Module |
|---|---|
Use Scenario: Protection of 24 V DC supply lines feeding PLC I/O modules subjected to relay coil flyback and ESD events. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input rail to clamp transients before they reach power management ICs and microcontrollers. Use Value: Limits voltage excursion to ≤43.0 V during 9.3 A surges, preventing latch-up or gate oxide damage in 24 V-rated logic and drivers. | Use Scenario: Safeguarding LIN bus interface circuits and window lift motor drivers exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24 V battery feed to absorb energy from ISO 7637-2 pulse 1 and pulse 5a events. Use Value: Maintains 24 V system integrity with <1.0 µA leakage at nominal voltage, avoiding battery drain while delivering 400 W surge immunity. |
| Telecom Power Supply Input | Consumer Appliance Mainboard |
Use Scenario: Input-stage protection for AC/DC adapters powering telecom routers and base station control cards. IC Role / Device Role / Timing Role: Primary-line TVS on secondary-side 24 V output to suppress coupling from primary-side switching noise and external surges. Use Value: Fast response time and low clamping voltage ensure downstream DC-DC converters and PHY ICs remain within absolute maximum ratings. | Use Scenario: Overvoltage guard on 24 V fan and solenoid driver outputs in smart washing machines and HVAC controllers. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing inductive kickback from brushed DC motors and valve coils. Use Value: Withstands 40 A 8.3 ms forward surge, enabling reliable protection even during frequent actuator cycling without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A-E3/5A | Lower VBR range (26.7–29.5 V), tighter tolerance; clamps at 38.9 V @ 10.3 A | Better suited for systems requiring lower clamping voltage and higher surge current margin | Select when tighter VBR tolerance and reduced VC are prioritized over maximum power rating |
| SMCJ24A-E3/57T | Higher power rating (1500 W), larger DO-214AB (SMC) package, same VWM/VC specs | Used where higher energy absorption is required, e.g., front-end power inputs or harsher EMC environments | Choose for elevated surge energy demands; requires PCB layout change due to larger footprint |
Compared with SMAJ24-E3/5A, SMAJ24A-E3/5A offers improved clamping efficiency at lower surge currents, while SMCJ24A-E3/57T provides threefold pulse power headroom at the cost of board space - making SMAJ24-E3/5A optimal for space-constrained 24 V rail protection with balanced performance.
Availability
SMAJ24-E3/5A is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and telecom power supply applications requiring stable component supply, RoHS compliance, and MSL Level 1 manufacturability.
Supply support for SMAJ24-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 high-reliability diodes, rectifiers, and protection devices for industrial, automotive, and computing markets.
The SMAJ series was engineered specifically for surface-mount transient suppression in 24 V–188 V DC systems, emphasizing low-profile packaging, automated assembly compatibility, and consistent clamping performance across temperature and surge repetition rates.
FAQ
What is the maximum clamping voltage of the SMAJ24-E3/5A under a 10/1000 µs surge?
The SMAJ24-E3/5A has a maximum clamping voltage (VC) of 43.0 V when subjected to its rated peak pulse current of 9.3 A with a 10/1000 µs waveform. This value is measured per Fig. 1 and Fig. 3 in Vishay document 88390 and reflects worst-case voltage seen by protected circuitry during standardized surge testing. The SMAJ24-E3/5A maintains this clamping performance across its specified operating temperature range.
Is the SMAJ24-E3/5A unidirectional or bidirectional?
The SMAJ24-E3/5A is a unidirectional Transient Voltage Suppressor. Its cathode is marked by a band on the DO-214AC (SMA) package body, and it conducts only in reverse bias during overvoltage events. Bidirectional variants use a "CA" suffix (e.g., SMAJ24CA); the SMAJ24-E3/5A does not support symmetrical clamping in both polarities.
What is the standoff voltage rating for the SMAJ24-E3/5A?
The SMAJ24-E3/5A has a standoff voltage (VWM) of 24 V - the maximum DC or continuous reverse working voltage that can be applied without triggering avalanche conduction. This rating ensures minimal leakage (<1.0 µA) during normal operation while allowing rapid response to transients exceeding 26.7 V breakdown threshold. The SMAJ24-E3/5A is intended for 24 V nominal systems where this margin is critical.
Does the SMAJ24-E3/5A meet automotive qualification standards?
The SMAJ24-E3/5A is commercial-grade and RoHS-compliant but not AEC-Q101 qualified. For automotive applications requiring AEC-Q101 certification, Vishay offers the SMAJ24HE3/5A variant (with HE3 suffix), which undergoes additional stress testing and is rated for high-reliability automotive use. The SMAJ24-E3/5A remains suitable for industrial and consumer designs where AEC-Q101 is not mandated.
What is the thermal resistance of the SMAJ24-E3/5A, and how does it affect layout?
The SMAJ24-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2 × 0.2" (5.0 × 5.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per Fig. 5 in document 88390. To maintain safe junction temperatures during repetitive surges, designers must ensure adequate copper area and avoid excessive trace length - the SMAJ24-E3/5A's thermal performance directly impacts its sustained surge capability.
SMAJ24-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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 43V
- Current - Peak Pulse (10/1000µs):
- 9.3A
- 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)
SMAJ24-E3/5A FAQ
1.How can I place an order for SMAJ24-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24-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 SMAJ24-E3/5A reliable?
The price and inventory of SMAJ24-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 SMAJ24-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ24-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24-E3/5A?
SMAJ24-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24-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 SMAJ24-E3/5A?
For technical support, including SMAJ24-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24-E3/5A requirements.
6.How does Aetrix verify that SMAJ24-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ24-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 SMAJ24-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ24-E3/5A?
All SMAJ24-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24-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 SMAJ24-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ24-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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