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Vishay General Semiconductor - Diodes Division SMAJ15AHE3_A/H
- Part No.:
- SMAJ15AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ15AHE3_A/H.pdf
- Description:
- TVS DIODE 15VWM 24.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,870
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Product details
Overview
SMAJ15AHE3_A/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for primary overvoltage protection of sensitive electronics. It features a 15 V standoff voltage (VWM), 16.7–18.5 V breakdown voltage (VBR) at 1 mA, 24.4 V maximum clamping voltage (VC) at 16.4 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - ideal for safeguarding MOSFETs, ICs, and sensor signal lines against inductive switching transients.
For engineers reviewing the SMAJ15AHE3_A/H datasheet, SMAJ15AHE3_A/H pinout, SMAJ15AHE3_A/H application, or SMAJ15AHE3_A/H equivalent, key selection criteria include its AEC-Q101 qualification, low incremental surge resistance, fast response time (<1 ps), RoHS-compliant matte tin-plated leads, and compatibility with automated SMT placement on consumer, industrial, and automotive PCBs.
Technical Context
This unidirectional TVS diode operates as a voltage-clamping device across power or signal lines, conducting only when reverse voltage exceeds VBR to shunt transient energy to ground. Its glass-passivated junction ensures stable leakage performance (≤1.0 μA at 15 V), while the SMA package provides thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead).
Rated for -55 °C to +150 °C operating junction temperature, SMAJ15AHE3_A/H supports repetitive surge events at 0.01% duty cycle and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. It is not intended for continuous forward conduction - forward voltage is 3.5 V at 25 A, but IFSM is limited to 40 A for 8.3 ms half-sine surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - maximum DC or RMS voltage the device blocks without clamping; sets minimum system operating margin before protection activates |
| VBR (min/max) | 16.7 V / 18.5 V at 1 mA - verified breakdown threshold range defining turn-on consistency across production lots |
| VC @ IPPM | 24.4 V at 16.4 A - clamping voltage under 10/1000 μs surge; determines maximum stress imposed on protected downstream circuitry |
| PPPM | 400 W - peak pulse power handling capability; defines transient energy absorption capacity for standard lightning/inductive spike waveforms |
| IFSM | 40 A - non-repetitive forward surge current rating; validates robustness against accidental polarity reversal or high-current fault conditions |
| TJ max | +150 °C - maximum junction temperature; enables reliable operation in under-hood automotive or high-ambient industrial environments |
| Package | SMA (DO-214AC) - surface-mount package with 5.0 mm × 5.0 mm copper pad thermal footprint; supports automated pick-and-place and IR reflow |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, polarity indicated by cathode band on unidirectional devices. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to line being protected (e.g., VIN, signal trace); forms low-impedance path to ground during overvoltage event |
| Cathode | Clamping reference / ground connection | Connected to system ground or low-impedance return plane; establishes clamping reference and carries full surge current during protection |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - suitable for engine control, ADAS, and infotainment systems |
| 400 W peak pulse power (10/1000 μs) | Enables protection against ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 Level 3 surges without derating below 78 V |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes voltage overshoot during clamping - critical for protecting 3.3 V or 5 V logic interfaces with tight absolute maximum ratings |
| MSL Level 1, 260 °C peak reflow | Eliminates moisture sensitivity concerns and pre-bake requirements - simplifies high-volume SMT manufacturing flow |
| Glass passivated junction | Ensures stable reverse leakage (<1 μA at VWM) and long-term parameter stability under thermal/humidity stress |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Primary clamping element placed between power rail and ground, activated within picoseconds of overvoltage onset. Use Value: Limits transient voltage to ≤24.4 V, preventing damage to 32-bit microcontrollers and CAN transceivers rated for 36 V absolute max. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) from ESD and field wiring faults in factory automation. IC Role / Device Role / Timing Role: Bidirectional-capable variant not used; SMAJ15AHE3_A/H serves as unidirectional clamp on supply-referenced signal paths. Use Value: Clamps induced surges to safe levels before they reach precision op-amps or ADC front-ends, preserving measurement integrity. |
| Consumer USB Port ESD Suppression | Telecom DSL Line Transient Protection |
Use Scenario: Secondary-level protection on VBUS line of USB 2.0 ports in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of polyfuse and load switch to absorb repetitive ESD strikes (IEC 61000-4-2 ±15 kV contact). Use Value: Withstands >1000 ESD events without parameter shift, maintaining 15 V hold-off while clamping to 24.4 V to protect USB PHY ICs. |
Use Scenario: Front-end surge suppression on twisted-pair DSL lines exposed to lightning-induced surges in outdoor cabinets. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to line-ground, coordinated with gas discharge tube (GDT) for staged protection. Use Value: Absorbs initial fast-rising edge (≤100 ns) with low VC, enabling GDT to handle bulk energy - extends overall system surge lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15A-E3/61 | Same electrical specs and SMA package; RoHS-compliant commercial grade without AEC-Q101 qualification | Lacks automotive qualification testing - unsuitable for under-hood or safety-critical modules | Select SMAJ15AHE3_A/H when AEC-Q101 compliance is required; use SMAJ15A-E3/61 for cost-sensitive consumer designs |
| SMBJ15AHE3_A/H | Same VWM, VBR, VC; higher 600 W PPPM rating due to SMB (DO-214AA) package with larger thermal mass | Requires larger PCB footprint (4.58 mm × 3.94 mm vs. 4.50 mm × 2.79 mm) and different pad layout | Choose SMBJ15AHE3_A/H where higher surge margin is needed and board space allows; SMAJ15AHE3_A/H preferred for compact layouts |
Compared with SMAJ15A-E3/61, SMAJ15AHE3_A/H adds automotive qualification without altering clamping behavior; versus SMBJ15AHE3_A/H, it trades 50% lower surge power for 30% smaller footprint and identical AEC-Q101 compliance - enabling space-constrained automotive modules.
Availability
SMAJ15AHE3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and consumer USB power protection requiring stable component supply, AEC-Q101 traceability, and RoHS-compliant sourcing.
Supply support for SMAJ15AHE3_A/H 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, efficiency, and application-specific optimization.
The SMAJ series delivers standardized TVS performance in compact surface-mount packages, engineered specifically for cost-effective, high-volume transient protection in automotive, industrial, and communications infrastructure.
FAQ
What is the clamping voltage of SMAJ15AHE3_A/H at its rated peak pulse current?
The SMAJ15AHE3_A/H has a maximum clamping voltage (VC) of 24.4 V at 16.4 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The clamping performance is guaranteed across the full operating temperature range (-55 °C to +150 °C) and is integral to the device's role in safeguarding 15 V nominal systems.
Is SMAJ15AHE3_A/H suitable for bidirectional transient protection?
No, SMAJ15AHE3_A/H is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. It conducts only in reverse bias above VBR and blocks forward current beyond its specified VF. For bidirectional protection, the "CA" variant (e.g., SMAJ15CAHE3_A/H) must be selected. Using SMAJ15AHE3_A/H on AC-coupled or floating signal lines without proper polarity alignment may result in unintended conduction or failure to clamp.
Does SMAJ15AHE3_A/H meet automotive qualification standards?
Yes, SMAJ15AHE3_A/H is explicitly AEC-Q101 qualified, as confirmed in the Vishay datasheet revision 09-Jan-2024 (Document Number: 88390). This qualification covers stress tests including high-temperature operating life, temperature cycling, and surge endurance - validating its suitability for automotive powertrain, body electronics, and ADAS applications where reliability under harsh environmental conditions is mandatory.
What is the thermal resistance of SMAJ15AHE3_A/H, and how does it affect PCB layout?
SMAJ15AHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W, measured on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To achieve rated 400 W pulse power, PCB layout must replicate this pad area and ensure adequate copper pour connectivity. Reducing pad size increases RθJA, lowering sustainable surge energy and risking thermal runaway during repetitive events.
How does the glass passivation in SMAJ15AHE3_A/H improve long-term reliability?
The glass passivated chip junction in SMAJ15AHE3_A/H provides hermetic protection against moisture ingress and ionic contamination, resulting in stable reverse leakage current (<1.0 μA at 15 V) over time and under humidity stress. This directly enhances field reliability in humid environments (e.g., automotive under-hood, industrial enclosures) and prevents parameter drift that could compromise clamping accuracy or lead to premature failure in safety-critical protection circuits.
SMAJ15AHE3_A/H 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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 16.4A
- 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)
SMAJ15AHE3_A/H FAQ
1.How can I place an order for SMAJ15AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ15AHE3_A/H 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 SMAJ15AHE3_A/H reliable?
The price and inventory of SMAJ15AHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ15AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ15AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ15AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ15AHE3_A/H?
SMAJ15AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ15AHE3_A/H 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 SMAJ15AHE3_A/H?
For technical support, including SMAJ15AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ15AHE3_A/H requirements.
6.How does Aetrix verify that SMAJ15AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ15AHE3_A/H 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 SMAJ15AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ15AHE3_A/H?
All SMAJ15AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ15AHE3_A/H, 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 SMAJ15AHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ15AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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