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Vishay General Semiconductor - Diodes Division SMAJ24AHE3_A/I
- Part No.:
- SMAJ24AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24AHE3_A/I.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,566
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Product details
Overview
SMAJ24AHE3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, 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, 38.9 V maximum clamping voltage (VC) at 10.3 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ24AHE3_A/I datasheet, SMAJ24AHE3_A/I pinout, SMAJ24AHE3_A/I application, or SMAJ24AHE3_A/I equivalent, key selection criteria include its AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.4), 1.0 μA max reverse leakage at VWM, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This unidirectional TVS diode operates as a shunt-clamping device that remains high-impedance below 24 V and rapidly transitions to low-impedance conduction above its 26.7 V minimum breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and fast response time (<1 ps) to ESD and lightning-induced transients.
Thermal performance is defined by RθJA = 120 °C/W (on recommended pad layout) and RθJL = 30 °C/W, enabling reliable operation up to TJ = +150 °C. The cathode band marking identifies polarity, and it meets J-STD-020 MSL Level 1 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC/AC rail protection level. |
| VBR (min/max) | 26.7 V / 29.5 V at IT = 1 mA - Tight 5% tolerance ensures predictable turn-on across temperature and production lots. |
| VC @ IPPM | 38.9 V at 10.3 A - Clamping voltage during 10/1000 μs surge; limits downstream IC stress to safe levels. |
| PPPM | 400 W - Peak pulse power handling capability under standard 10/1000 μs waveform; derates to 300 W above 78 V. |
| IPPM | 10.3 A - Maximum non-repetitive surge current supported without degradation; validated per Fig. 3 waveform. |
| ID @ VWM | ≤1.0 μA - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in battery systems. |
| TJ range | −55 °C to +150 °C - Full automotive-grade operating and storage temperature range; supports under-hood deployment. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode identified by black band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to protected line's lower-potential side (e.g., ground or return path) in unidirectional configuration. |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to protected line's higher-potential side (e.g., VCC, signal line); band-marked end enables automated optical inspection. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment power rails. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage performance across thermal cycling and humidity exposure. |
| 400 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 surge events without parametric shift. |
| MSL Level 1 (260 °C peak) | Enables single-pass lead-free reflow without moisture-induced damage or popcorn cracking. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes voltage overshoot during clamping, reducing risk of latch-up or gate oxide stress in downstream MOSFETs/ICs. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply inputs in body control modules against load dump and alternator transients. IC Role / Device Role / Timing Role: Shunt-clamping TVS placed between VBAT and chassis ground to clamp surges >35 V within nanoseconds. Use Value: Limits transient voltage to ≤38.9 V, preventing damage to 36 V-rated DC-DC converters and microcontrollers. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-ground, cathode-to-signal line to absorb negative-going transients. Use Value: Maintains signal fidelity with <1.0 μA leakage at 24 V, avoiding offset errors in precision current-sense circuits. |
| Consumer Device USB Port Protection | Telecom Equipment DC Input Protection |
|
Use Scenario: Adding secondary surge immunity on 5 V USB VBUS lines in smart home hubs exposed to AC adapter surges. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of USB power switch to clamp fast-rising transients before they reach load switches. Use Value: Responds in <1 ps to meet IEC 61000-4-2 Level 4 (15 kV air, 8 kV contact) without affecting USB 2.0 signal integrity. |
Use Scenario: Hardening −48 V DC input of telecom base station power supplies against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Used in series with higher-voltage TVS arrays to handle initial energy absorption before crowbar activation. Use Value: Provides precise 24 V clamping headroom for cascaded protection schemes while maintaining 150 °C junction capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24AHM3_A/I | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | No functional difference; selected when halogen-free material compliance is mandated by OEM or regional regulation. | Choose SMAJ24AHM3_A/I if halogen-free bill-of-materials is required; otherwise SMAJ24AHE3_A/I offers standard RoHS compliance. |
| SMAJ24A-E3/5A | Same electrical characteristics and AEC-Q101 qualification; differs only in packaging (13" reel, 7500 pcs) and commercial-grade suffix (E3 vs HE3). | Lacks AEC-Q101 certification documentation traceability; suitable for non-automotive industrial or consumer use where qualification isn't mandatory. | Select SMAJ24A-E3/5A for cost-sensitive non-automotive designs; SMAJ24AHE3_A/I is required for automotive-tier procurement. |
Compared with SMAJ24AHE3_A/I, SMAJ24AHM3_A/I adds halogen-free compliance without altering protection performance, while SMAJ24A-E3/5A omits AEC-Q101 traceability - making the HE3 variant essential for automotive PPAP and Tier-1 supply chain requirements.
Availability
SMAJ24AHE3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom DC power inputs requiring stable component supply with full AEC-Q101 qualification and traceable sourcing.
Supply support for SMAJ24AHE3_A/I 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, TVS devices, and optoelectronics with emphasis on reliability and automotive-grade validation.
The SMAJ series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness, low clamping, and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SMAJ24AHE3_A/I at its rated peak pulse current?
The SMAJ24AHE3_A/I has a maximum clamping voltage (VC) of 38.9 V at its rated peak pulse current (IPPM) of 10.3 A, measured under the standardized 10/1000 μs double-exponential surge waveform. This value is guaranteed across the full operating temperature range and confirms the device's ability to limit transient overvoltage to a safe level for downstream 36 V-rated components. The SMAJ24AHE3_A/I achieves this with a clamping ratio of approximately 1.4 relative to its minimum breakdown voltage.
Is SMAJ24AHE3_A/I qualified for automotive applications?
Yes, SMAJ24AHE3_A/I is explicitly AEC-Q101 qualified, as confirmed in the Vishay datasheet revision 09-Jan-2024 (Document Number: 88390). The "HE3" suffix denotes RoHS-compliant and AEC-Q101 qualified construction, validated for use in automotive powertrain, chassis, and body electronics. This qualification includes stress testing for temperature cycling, humidity bias, mechanical shock, and surge robustness - making SMAJ24AHE3_A/I suitable for PPAP submission and Tier-1 automotive procurement.
What is the standoff voltage and maximum leakage current of SMAJ24AHE3_A/I?
The SMAJ24AHE3_A/I has a standoff voltage (VWM) of 24 V - the maximum DC or RMS voltage it can withstand continuously without entering breakdown. At this voltage, its maximum reverse leakage current (ID) is 1.0 μA at TA = 25 °C, rising slightly with temperature but remaining well below 5 μA up to +125 °C. This ultra-low leakage ensures minimal impact on battery-powered systems and high-impedance sensor circuits, preserving accuracy and extending operational life. The SMAJ24AHE3_A/I maintains these values across its full −55 °C to +150 °C junction temperature range.
What package type does SMAJ24AHE3_A/I use, and what are its mounting requirements?
SMAJ24AHE3_A/I uses the SMA (DO-214AC) surface-mount package - a low-profile, molded plastic case with coplanar matte tin-plated leads. It requires mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated 400 W pulse power dissipation. The device meets J-STD-020 MSL Level 1 and supports lead-free reflow up to 260 °C peak. Polarity is marked by a cathode band; correct orientation is critical for unidirectional clamping function. The SMAJ24AHE3_A/I is optimized for high-speed automated placement and AOI verification.
How does SMAJ24AHE3_A/I differ from SMAJ24A-E3/5A?
SMAJ24AHE3_A/I and SMAJ24A-E3/5A share identical electrical specifications (VWM = 24 V, VBR = 26.7–29.5 V, VC = 38.9 V), thermal ratings, and package dimensions. The key distinction lies in qualification: SMAJ24AHE3_A/I carries documented AEC-Q101 qualification and traceable automotive-grade manufacturing controls, while SMAJ24A-E3/5A is commercial-grade (E3 suffix) without automotive validation. Both use 13" reels (7500 pcs), but only SMAJ24AHE3_A/I satisfies OEM automotive design-in and PPAP requirements.
SMAJ24AHE3_A/I 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:
- -
- 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_A/I FAQ
1.How can I place an order for SMAJ24AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24AHE3_A/I 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_A/I reliable?
The price and inventory of SMAJ24AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ24AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ24AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24AHE3_A/I?
SMAJ24AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24AHE3_A/I 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_A/I?
For technical support, including SMAJ24AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24AHE3_A/I requirements.
6.How does Aetrix verify that SMAJ24AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ24AHE3_A/I 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_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ24AHE3_A/I?
All SMAJ24AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24AHE3_A/I, 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_A/I part is unused and in its original packaging.
Return procedure for SMAJ24AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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