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Vishay General Semiconductor - Diodes Division SMAJ24AHE3/5A
- Part No.:
- SMAJ24AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24AHE3/5A.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,718
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Product details
Overview
SMAJ24AHE3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 24 V standoff voltage (VWM), 26.7–29.5 V breakdown voltage (VBR) at 1 mA, and clamps transients to ≤38.9 V at 10.3 A peak pulse current (IPPM), delivering 400 W peak pulse power (10/1000 μs waveform). It is widely deployed in automotive power line protection, industrial sensor interface circuits, and DC input stages of embedded controllers.
For engineers reviewing the SMAJ24AHE3/5A datasheet, SMAJ24AHE3/5A pinout, SMAJ24AHE3/5A application, or SMAJ24AHE3/5A equivalent, key selection criteria include its AEC-Q101 qualification, SMA (DO-214AC) surface-mount package, low clamping ratio (VC/VWM ≈ 1.62), and compatibility with automated SMT assembly under J-STD-020 MSL Level 1.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, entering avalanche conduction when reverse voltage exceeds VBR. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ps), enabling suppression of ESD (IEC 61000-4-2) and lightning-induced surges (IEC 61000-4-5).
The SMAJ24AHE3/5A is rated for 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), supports continuous power dissipation of 3.3 W at 50 °C ambient, and exhibits a thermal resistance of 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads - critical for thermal design validation in high-reliability PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working range. |
| VBR (min/max) | 26.7 V / 29.5 V at IT = 1 mA - Confirmed breakdown threshold window; ensures reliable turn-on margin above VWM. |
| VC @ IPPM | ≤38.9 V at 10.3 A - Clamped voltage during 400 W transient; determines maximum stress on downstream ICs. |
| IPPM | 10.3 A - Peak surge current capability with 10/1000 μs waveform; validates protection level against ISO 7637-2 Pulse 1/2a/5a. |
| PPPM | 400 W - Peak pulse power rating; enables single-device protection for 12 V/24 V automotive and industrial supply rails. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in under-hood or enclosed industrial enclosures. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with cathode band marking; compatible with JEDEC MS-012AC footprint. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 (260 °C peak reflow), RoHS-compliant and AEC-Q101 qualified. Cathode identified by a single band on the body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-potential node; completes clamping path during reverse transient events. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 24 V rail); conducts avalanche current when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control units and ADAS power supplies. |
| 400 W peak pulse power (10/1000 μs) | Enables single-device protection against ISO 16750-2 load dump and ISO 7637-2 Pulse 5a without external series impedance. |
| Low clamping ratio (VC/VWM ≈ 1.62) | Minimizes overvoltage stress on downstream 3.3 V/5 V logic; preserves margin below absolute maximum ratings of protected ICs. |
| Glass-passivated junction | Ensures stable VBR over lifetime and temperature; eliminates parameter drift due to moisture ingress or bias stress. |
| MSL Level 1 compliance | Supports lead-free reflow up to 260 °C without preconditioning - simplifies manufacturing and eliminates bake-out steps. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface |
|---|---|
|
Use Scenario: Protecting 24 V supply inputs of body control modules (BCM) against load dump transients per ISO 16750-2. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed directly across input terminals, acting as first-line overvoltage shunt. Use Value: Limits transient voltage to ≤38.9 V, preventing latch-up or gate oxide damage in upstream DC/DC controllers and microcontrollers. |
Use Scenario: Safeguarding analog front-end inputs of pressure/temperature sensors in PLC I/O modules exposed to inductive switching noise. IC Role / Device Role / Timing Role: Reverse-biased TVS connected between signal line and ground, suppressing fast-rising EFT bursts (IEC 61000-4-4). Use Value: Sub-nanosecond response clamps spikes before they propagate into precision ADCs, maintaining measurement integrity. |
| DC Motor Drive Control | Telecom Power Supply Input |
|
Use Scenario: Shielding H-bridge gate drivers and current sense amplifiers from flyback voltage spikes generated by brushed DC motors. IC Role / Device Role / Timing Role: TVS mounted across motor supply rail (VMOT–GND), absorbing inductive kickback energy. Use Value: 400 W pulse handling absorbs repetitive 100–500 mJ spikes without degradation, extending system MTBF. |
Use Scenario: Front-end surge protection for 48 V telecom rectifier outputs feeding base station backplane power distribution. IC Role / Device Role / Timing Role: Primary clamping element in multi-stage protection network, coordinated with MOVs and GDTs. Use Value: Low leakage (<1 μA at 24 V) avoids standby current penalty; tight VBR tolerance ensures staged coordination with secondary protectors. |
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 | Commercial-grade version; identical electrical specs but not AEC-Q101 qualified. | Limited to non-automotive industrial or consumer use where automotive reliability certification is not required. | Select when cost sensitivity outweighs automotive qualification needs and full temperature range (-55 °C to +150 °C) is not mandated. |
| SMBJ24AHE3/5A | Same VWM/VBR/VC, but SMB package (DO-214AA) offers higher 600 W PPPM and lower RθJA (90 °C/W). | Better suited for higher-energy transients or thermally constrained layouts where footprint increase is acceptable. | Choose when system-level surge testing exceeds 400 W or board space allows larger SMB footprint for improved thermal margin. |
Compared with SMAJ24A-E3/5A, the SMAJ24AHE3/5A adds AEC-Q101 qualification for automotive use; compared with SMBJ24AHE3/5A, it trades peak power and thermal performance for smaller SMA footprint - making it optimal for space-constrained automotive ECUs requiring certified reliability.
Availability
SMAJ24AHE3/5A is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom power supply inputs requiring stable component supply, long-term lifecycle support, and traceable AEC-Q101 qualified parts.
Supply support for SMAJ24AHE3/5A 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-speed transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against ESD, EFT, and surge events is mission-critical.
FAQ
What is the clamping voltage of the SMAJ24AHE3/5A at its rated peak pulse current?
The SMAJ24AHE3/5A clamps to a maximum of 38.9 V at its rated peak pulse current of 10.3 A (10/1000 μs waveform). This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The clamping performance is guaranteed across the full operating temperature range of -55 °C to +150 °C, ensuring consistent protection in automotive and industrial environments where the SMAJ24AHE3/5A is commonly deployed.
Is the SMAJ24AHE3/5A suitable for automotive applications?
Yes, the SMAJ24AHE3/5A is AEC-Q101 qualified, meaning it has passed rigorous stress tests including temperature cycling, high-temperature reverse bias, and ESD immunity required for automotive electronics. Its construction - glass-passivated junction, matte tin-plated leads, and MSL Level 1 reflow compatibility - meets automotive manufacturing standards. The SMAJ24AHE3/5A is explicitly recommended for protecting 12 V and 24 V power nets in engine control units, body modules, and ADAS subsystems per ISO 16750 and ISO 7637 standards.
What does the "HE3" suffix indicate in SMAJ24AHE3/5A?
The "HE3" suffix in SMAJ24AHE3/5A denotes that the part is RoHS-compliant and AEC-Q101 qualified, with "H" indicating automotive qualification and "E3" specifying RoHS-compliant commercial-grade construction. This distinguishes it from the "E3"-only variant (SMAJ24A-E3/5A), which shares identical electrical specifications but lacks automotive qualification. The "5A" denotes the packaging format: 7500-unit tape-and-reel on 13-inch diameter reels, optimized for high-volume SMT placement.
How does the SMAJ24AHE3/5A compare to bidirectional TVS diodes like SMAJ24CA?
The SMAJ24AHE3/5A is unidirectional and intended for DC line protection where polarity is fixed (e.g., 24 V supply to ground), offering lower leakage and tighter VBR tolerance than bidirectional variants. In contrast, SMAJ24CA provides symmetrical clamping for AC or floating lines but exhibits higher reverse leakage and slightly wider VBR spread. For 24 V automotive power rails, the SMAJ24AHE3/5A delivers superior clamping efficiency and lower standby current - critical for battery-sensitive systems where the SMAJ24AHE3/5A is routinely specified.
What is the thermal resistance of the SMAJ24AHE3/5A, and how does it affect layout design?
The SMAJ24AHE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value directly impacts sustained power handling: at 3.3 W continuous dissipation, junction temperature rise is ~396 °C above ambient - hence derating is essential. Layout best practices for the SMAJ24AHE3/5A include maximizing copper area, using internal ground planes, and avoiding thermal isolation; failure to do so risks exceeding the +150 °C TJ max. rating during repeated surge events.
SMAJ24AHE3/5A 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:
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ24AHE3/5A FAQ
1.How can I place an order for SMAJ24AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24AHE3/5A 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 SMAJ24AHE3/5A reliable?
The price and inventory of SMAJ24AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ24AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ24AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24AHE3/5A?
SMAJ24AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24AHE3/5A 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 SMAJ24AHE3/5A?
For technical support, including SMAJ24AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24AHE3/5A requirements.
6.How does Aetrix verify that SMAJ24AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ24AHE3/5A 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 SMAJ24AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ24AHE3/5A?
All SMAJ24AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24AHE3/5A, 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 SMAJ24AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ24AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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