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Vishay General Semiconductor - Diodes Division SMAJ17AHE3/5A
- Part No.:
- SMAJ17AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ17AHE3/5A.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,379
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Product details
Overview
SMAJ17AHE3/5A from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping inductive switching transients and ESD events on power and signal lines. It features a 17 V standoff voltage (VWM), 18.9–20.9 V breakdown voltage (VBR) at 1 mA, 27.6 V maximum clamping voltage (VC) at 14.5 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ17AHE3/5A datasheet, SMAJ17AHE3/5A pinout, SMAJ17AHE3/5A application, or SMAJ17AHE3/5A equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 120 °C/W junction-to-ambient thermal resistance, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamping protection device triggered by overvoltage events exceeding its reverse standoff threshold. Its glass-passivated junction enables fast response time (<1 ps) and low incremental surge resistance, ensuring robust suppression of 8.3 ms half-sine surges up to 40 A (IFSM) and repetitive 10/1000 μs transients at 0.01% duty cycle.
The SMAJ17AHE3/5A is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020, and supports lead-free reflow with peak temperature up to 260 °C. Its unidirectional configuration uses cathode-band marking and delivers 1.0 μA max reverse leakage at 17 V, enabling low-power standby integrity in always-on circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC bias margin for protected line. |
| VBR (min/max) | 18.9 V / 20.9 V at 1 mA - Confirmed breakdown range ensures reliable turn-on without premature conduction under normal operation. |
| VC @ IPPM | 27.6 V at 14.5 A - Clamping voltage limits downstream component stress during 10/1000 μs surge; critical for IC-level protection. |
| PPPM | 400 W - Peak pulse power handling capability with standard 10/1000 μs waveform; derates to 300 W above 78 V. |
| IFSM | 40 A - Single half-sine surge rating (8.3 ms); validates robustness against motor-switching or relay-coil kickback events. |
| TJ max | +150 °C - Maximum junction temperature supports operation in under-hood automotive and high-ambient industrial environments. |
| RθJA | 120 °C/W - Thermal resistance determines required PCB copper area (0.2" × 0.2") for sustained power dissipation without overheating. |
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 indicated by band marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connects to protected line; conducts surge current to ground when VREV > VBR; must be routed with low-inductance path to GND plane. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control, ADAS, and body electronics. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term leakage stability across life cycle, critical for safety-critical protection circuits. |
| 400 W peak pulse power (10/1000 μs) | Provides higher surge margin than standard 200 W TVS devices, enabling fewer components per rail in compact power designs. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking - simplifies manufacturing for high-volume SMT assembly. |
| RoHS-compliant & halogen-free option | Base P/N HE3 denotes RoHS compliance; HM3 suffix adds halogen-free molding compound - meets Tier 1 automotive material requirements. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load-dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between power input and local regulator input. Use Value: Limits voltage to ≤27.6 V during 400 W surges, preventing damage to downstream LDOs and microcontrollers. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across differential signal pair or single-ended output to GND. Use Value: Sub-1 pF junction capacitance (typ.) avoids signal integrity degradation while clamping ±8 kV contact ESD per IEC 61000-4-2. |
| Motor Drive Gate Protection | Telecom Line Surge Suppression |
|
Use Scenario: Safeguarding high-side N-channel MOSFET gate drivers from Miller-induced voltage spikes during switching. IC Role / Device Role / Timing Role: TVS placed between gate and source to clamp dv/dt-induced overshoot below MOSFET VGS(max). Use Value: 14.5 A peak pulse current capacity handles fast-rising gate transients without thermal runaway. |
Use Scenario: Front-end protection of Ethernet PHY or RS-485 transceivers exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary unidirectional TVS on VCC rail and secondary bidirectional TVS on data lines. Use Value: 27.6 V clamping voltage ensures transceiver supply remains within absolute maximum ratings during 10/1000 μs telecom surge tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17A-E3/5A | No AEC-Q101 qualification; commercial grade only; same electrical specs and package. | Limited to non-automotive industrial or consumer use where automotive reliability not mandated. | Select when cost sensitivity outweighs automotive qualification requirement and full lifecycle traceability is not needed. |
| SMAJ17CAHE3/5A | Bidirectional variant; symmetric VBR (18.9–20.9 V) in both polarities; identical VC, PPPM, and thermal specs. | Required for AC-coupled or floating signal lines where polarity reversal or bipolar transients occur (e.g., RS-485, CAN FD). | Choose for bidirectional protection needs; requires no circuit redesign but replaces unidirectional function with dual-polarity capability. |
Compared with SMAJ17AHE3/5A, the SMAJ17A-E3/5A offers identical clamping performance at lower qualification cost, while SMAJ17CAHE3/5A extends protection to reverse-polarity events - making the latter essential for differential or AC-biased interfaces despite identical footprint and thermal behavior.
Availability
SMAJ17AHE3/5A is available at Aetrix Electronics and suitable for automotive control units, industrial sensor nodes, motor drive gate circuits, and telecom interface modules requiring stable component supply with AEC-Q101 assurance and full RoHS compliance.
Supply support for SMAJ17AHE3/5A 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, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was developed for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping, low leakage, and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMAJ17AHE3/5A at its rated peak pulse current?
The SMAJ17AHE3/5A has a maximum clamping voltage (VC) of 27.6 V at 14.5 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ17AHE3/5A maintains this clamping performance across its qualified temperature range and is validated per AEC-Q101 stress testing protocols.
Is SMAJ17AHE3/5A suitable for automotive applications?
Yes, SMAJ17AHE3/5A is AEC-Q101 qualified and specifically designed for automotive use, including engine control units, body electronics, and ADAS subsystems. Its qualification covers temperature cycling, highly accelerated life testing, and ESD robustness. The "HE3" suffix confirms RoHS compliance and automotive-grade screening, making SMAJ17AHE3/5A appropriate for under-hood and cabin applications demanding long-term reliability.
How does the SMAJ17AHE3/5A differ from the SMAJ17A-E3/5A?
The SMAJ17AHE3/5A includes AEC-Q101 qualification and automotive-grade screening, whereas SMAJ17A-E3/5A is commercial-grade only. Both share identical electrical parameters (VWM = 17 V, VC = 27.6 V, PPPM = 400 W), package (SMA), and RoHS compliance. The HE3 version adds traceability, extended temperature validation, and failure rate reporting required for automotive OEMs - making SMAJ17AHE3/5A the correct choice for Tier 1 supply chains.
What is the thermal resistance of SMAJ17AHE3/5A, and how does it affect PCB layout?
The SMAJ17AHE3/5A 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 dictates minimum copper area needed to dissipate 3.3 W continuous power without exceeding +150 °C junction temperature. For reliable operation under repeated surges, designers must maintain these pad dimensions and avoid thermal isolation - SMAJ17AHE3/5A's RθJL of 30 °C/W further supports heat transfer through leads to inner layers.
Can SMAJ17AHE3/5A be used in bidirectional signal protection?
No - SMAJ17AHE3/5A is unidirectional and functions only in reverse-bias clamping mode; applying positive voltage to its anode beyond forward voltage (~3.5 V at 25 A) risks conduction and failure. For bidirectional protection (e.g., RS-485, CAN, AC lines), the SMAJ17CAHE3/5A variant must be used. That part provides symmetrical breakdown and clamping in both directions while sharing the same package, thermal specs, and AEC-Q101 qualification as SMAJ17AHE3/5A.
SMAJ17AHE3/5A 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):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 14.5A
- 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)
SMAJ17AHE3/5A FAQ
1.How can I place an order for SMAJ17AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ17AHE3/5A 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 SMAJ17AHE3/5A reliable?
The price and inventory of SMAJ17AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ17AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ17AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ17AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ17AHE3/5A?
SMAJ17AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ17AHE3/5A 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 SMAJ17AHE3/5A?
For technical support, including SMAJ17AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ17AHE3/5A requirements.
6.How does Aetrix verify that SMAJ17AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ17AHE3/5A 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 SMAJ17AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ17AHE3/5A?
All SMAJ17AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ17AHE3/5A, 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 SMAJ17AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ17AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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