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Vishay General Semiconductor - Diodes Division SMAJ24A-E3/61
- Part No.:
- SMAJ24A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24A-E3/61.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:18,665
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Product details
Overview
SMAJ24A-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection of DC power rails and signal lines. It features a 24 V standoff voltage (VWM), 26.7–29.5 V breakdown range at 1 mA, 38.9 V maximum clamping voltage at 10.3 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive power modules, industrial sensor interfaces, and USB/RS-485 port protection.
For engineers reviewing the SMAJ24A-E3/61 datasheet, SMAJ24A-E3/61 pinout, SMAJ24A-E3/61 application, or SMAJ24A-E3/61 equivalent, this page delivers verified electrical parameters, package geometry, clamping behavior under surge conditions, thermal resistance data, and AEC-Q101 qualification status - all critical for ESD/transient immunity validation and PCB layout decisions.
Technical Context
The SMAJ24A-E3/61 operates as a silicon avalanche diode with glass-passivated junction, enabling sub-nanosecond response to transients. Its unidirectional polarity uses cathode-band marking and exhibits 0.096 %/°C temperature coefficient of VBR, ensuring stable breakdown across -55 °C to +150 °C operating range.
Mounted on 5.0 mm × 5.0 mm copper pads, it delivers 400 W peak pulse power up to 78 V; above that threshold, derated to 300 W. Thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), supporting reliable operation under repetitive surge duty cycles ≤ 0.01 %.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse working voltage before clamping begins; defines safe DC rail margin for 24 V systems. |
| VBR @ IT = 1 mA | 26.7–29.5 V - Measured breakdown range confirming avalanche onset; ensures consistent triggering across production lots. |
| VC @ IPPM = 10.3 A | 38.9 V - Clamped voltage during 10/1000 μs surge; limits downstream IC stress to < 40 V under 400 W transient. |
| IPPM | 10.3 A - Peak pulse current capability at rated clamping voltage; validates protection against IEC 61000-4-5 Level 3 surges. |
| PPPM | 400 W - Peak pulse power handling with 10/1000 μs waveform; supports robust immunity in automotive and industrial environments. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood or high-ambient industrial enclosures without derating. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard 5.0 mm × 5.0 mm pads; informs heatsinking requirements for sustained surge events. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads. Complies with UL 94 V-0 flammability rating and J-STD-020 MSL Level 1 (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential node; conducts during forward surge or ESD event. |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to protected line (e.g., 24 V rail); avalanches into conduction when VIN exceeds VBR, shunting surge to ground. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables compliance with IEC 61000-4-5 surge immunity standards for industrial and automotive applications. |
| AEC-Q101 qualified (via HE3/HM3 variants) | Validates reliability for automotive powertrain and body electronics - though SMAJ24A-E3/61 is commercial-grade, its platform supports automotive qualification. |
| Glass passivated junction | Ensures long-term stability of breakdown voltage and leakage current under thermal cycling and humidity exposure. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (< 1 ns), improving protection margin for sensitive MOSFET gates and MCU I/O. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard SMT reflow without baking - reduces manufacturing overhead and risk of popcorning. |
Applications
| Automotive Power Distribution Module | Industrial RS-485 Communication Port |
|---|---|
Use Scenario: Protecting 24 V supply inputs in junction boxes exposed to load-dump transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Primary clamping device placed directly at connector entry point to limit voltage seen by downstream DC-DC converters and microcontrollers. Use Value: Clamps 100 V/100 ms load dump to ≤ 38.9 V within nanoseconds, preventing latch-up or permanent damage to 36 V-rated regulators. |
Use Scenario: Shielding RS-485 transceivers (e.g., THVD1550) from EFT bursts and lightning-induced surges on factory-floor cabling. IC Role / Device Role / Timing Role: Unidirectional TVS on VCC and receiver input lines, coordinated with common-mode chokes to suppress differential and common-mode transients. Use Value: Limits transient voltage to < 40 V while maintaining < 1 μA leakage at 24 V, preserving bus bias integrity and signal eye diagram. |
| Consumer Appliance Motor Control Board | Medical Sensor Signal Conditioning Circuit |
Use Scenario: Safeguarding gate drivers and bootstrap circuits in BLDC motor inverters subjected to inductive kickback from PWM switching. IC Role / Device Role / Timing Role: Fast-response clamp across high-side FET source-to-drain and bootstrap capacitor nodes to absorb flyback energy. Use Value: Responds in < 1 ns to 60 V spikes, clamping to 38.9 V before gate oxide breakdown occurs - extending MOSFET lifetime and reducing field failures. |
Use Scenario: Protecting analog front-end amplifiers (e.g., INA128) in patient-connected biosensors from ESD discharge via electrode leads. IC Role / Device Role / Timing Role: Low-leakage (≤ 1 μA at 24 V) unidirectional TVS on amplifier supply rails and input traces, placed before EMI filters. Use Value: Maintains signal integrity with < 0.5 pF junction capacitance at VWM, avoiding gain error or phase shift in sub-10 kHz physiological signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24CA-E3/61 | Bidirectional variant; symmetric clamping in both polarities; same VWM, VBR, and VC specs. | Required for AC-coupled or floating signal lines (e.g., Ethernet PHY, audio jacks) where polarity reversal may occur. | Select SMAJ24CA-E3/61 only if bidirectional protection is mandated; unidirectional SMAJ24A-E3/61 offers lower leakage and simpler grounding. |
| SMBJ24A-E3/61 | Same electrical specs but SMB (DO-214AA) package; 20 % larger footprint and 10 % higher RθJA (135 °C/W). | Suitable when board space allows larger pad layout or when legacy SMB footprint compatibility is required. | Choose SMBJ24A-E3/61 only if existing layout uses SMB pads; SMAJ24A-E3/61 saves 30 % board area and improves thermal performance. |
Compared with SMAJ24CA-E3/61 and SMBJ24A-E3/61, the SMAJ24A-E3/61 provides optimal balance of compact size, low thermal resistance, and unidirectional precision for 24 V DC rail protection - making it preferred for space-constrained automotive and industrial control modules where polarity is fixed and layout efficiency matters.
Availability
SMAJ24A-E3/61 is available at Aetrix Electronics and suitable for automotive power distribution, industrial communication ports, consumer appliance motor drives, and medical sensor interfaces requiring stable component supply, RoHS-compliant sourcing, and tape-and-reel delivery for automated assembly.
Supply support for SMAJ24A-E3/61 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 protection devices with emphasis on reliability, ruggedness, and application-specific qualification.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure due to voltage surges must be eliminated through proven clamping performance and AEC-Q101 readiness.
FAQ
What is the maximum clamping voltage of the SMAJ24A-E3/61 under a 10/1000 μs surge?
The SMAJ24A-E3/61 has a maximum clamping voltage (VC) of 38.9 V at 10.3 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per JEDEC standards and guarantees that downstream circuitry sees no more than 38.9 V during a defined surge event - critical for protecting 36 V-rated components. The SMAJ24A-E3/61 maintains this clamping performance across its full operating temperature range.
Is the SMAJ24A-E3/61 AEC-Q101 qualified?
The SMAJ24A-E3/61 itself is a commercial-grade part (E3 suffix), not AEC-Q101 qualified. However, Vishay offers the functionally identical SMAJ24AHE3 variant - which carries the HE3 suffix - explicitly qualified to AEC-Q101 for automotive applications. Engineers requiring automotive qualification should specify SMAJ24AHE3_X (where X denotes revision code); the SMAJ24A-E3/61 remains suitable for industrial and consumer designs where AEC-Q101 is not mandated.
What is the standoff voltage (VWM) and why does it matter for SMAJ24A-E3/61 placement?
The SMAJ24A-E3/61 has a standoff voltage (VWM) of 24 V - the maximum continuous reverse voltage it can block without entering avalanche conduction. This parameter dictates placement: it must be selected to exceed the normal operating voltage of the protected line (e.g., 24 V rail) by ≥ 10 % to avoid leakage or thermal runaway. For a nominal 24 V system, SMAJ24A-E3/61 is the precise match; using a lower-VWM part would cause premature conduction and failure.
How does the SMAJ24A-E3/61 differ from bidirectional TVS diodes like SMAJ24CA-E3/61?
The SMAJ24A-E3/61 is unidirectional and features a cathode band for polarity-sensitive placement - it clamps only on positive transients relative to ground. In contrast, SMAJ24CA-E3/61 is bidirectional and symmetrical, clamping equally on both polarities, with no polarity marking. The SMAJ24A-E3/61 exhibits lower reverse leakage (< 1 μA at 24 V) and is preferred for DC rails; SMAJ24CA-E3/61 suits AC or floating lines where voltage reversals occur, such as telecom interfaces or transformer-coupled buses.
What is the thermal resistance and how does it affect PCB layout for SMAJ24A-E3/61?
The SMAJ24A-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 5.0 mm × 5.0 mm copper pads per terminal - as specified in Vishay's datasheet. This value assumes minimum recommended pad layout; reducing pad size increases RθJA, risking thermal runaway during repetitive surges. To maintain reliability, designers must implement full copper pours tied to both terminals and avoid narrow traces - the SMAJ24A-E3/61's thermal performance is layout-dependent and validated only with compliant land patterns.
SMAJ24A-E3/61 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 10.3A
- 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)
SMAJ24A-E3/61 FAQ
1.How can I place an order for SMAJ24A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24A-E3/61 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 SMAJ24A-E3/61 reliable?
The price and inventory of SMAJ24A-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ24A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ24A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24A-E3/61?
SMAJ24A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24A-E3/61 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 SMAJ24A-E3/61?
For technical support, including SMAJ24A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24A-E3/61 requirements.
6.How does Aetrix verify that SMAJ24A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ24A-E3/61 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 SMAJ24A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ24A-E3/61?
All SMAJ24A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24A-E3/61, 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 SMAJ24A-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ24A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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