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Vishay General Semiconductor - Diodes Division SMAJ17AHM3/H
- Part No.:
- SMAJ17AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ17AHM3/H.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,319
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Product details
Overview
SMAJ17AHM3/H 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 17 V standoff voltage (VWM), 18.9–20.9 V breakdown voltage (VBR) at 1 mA, and clamps transients to ≤27.6 V at 14.5 A peak pulse current (IPPM) under 10/1000 μs waveform - ideal for safeguarding MOSFET gates, microcontroller I/O lines, and automotive sensor interfaces.
For engineers reviewing the SMAJ17AHM3/H datasheet, SMAJ17AHM3/H pinout, SMAJ17AHM3/H application, or SMAJ17AHM3/H equivalent, this device delivers AEC-Q101 qualified surge immunity with halogen-free, RoHS-compliant construction, low incremental surge resistance, and fast sub-nanosecond response - critical for ESD and load-switching transient suppression in industrial and automotive power rails.
Technical Context
This TVS diode operates as a clamping-type protector: when reverse voltage exceeds VWM = 17 V, it avalanches into low-impedance conduction, limiting downstream voltage to ≤27.6 V at rated IPPM. Its unidirectional polarity (cathode-banded) enables DC-biased line protection without forward conduction during normal operation.
Rated for 400 W peak pulse power (10/1000 μs), it sustains repetitive surges at 0.01% duty cycle and derates linearly above TA = 25 °C per Fig. 2. Thermal resistance is RθJA = 120 °C/W (on 0.2" × 0.2" copper pads), enabling reliable operation up to TJ = 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 18.9 V / 20.9 V at IT = 1 mA - precise avalanche onset range defining turn-on threshold |
| VC @ IPPM | ≤27.6 V at 14.5 A - clamped voltage during worst-case 400 W transient, limiting stress on protected IC |
| IPPM | 14.5 A - peak surge current capability under standardized 10/1000 μs waveform |
| PPPM | 400 W - transient energy absorption capacity, sufficient for ISO 7637-2 Pulse 1/2a/5a compliance |
| TJ max | +150 °C - junction temperature limit enabling use in under-hood automotive environments |
| Package | SMA (DO-214AC) - surface-mount, low-profile package compatible with automated placement and J-STD-020 MSL Level 1 |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; cathode indicated by band on one end; meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to ground or low-side return path; defines polarity for unidirectional clamping |
| Cathode | Clamping output / Surge sink node | Banded terminal; connected to protected line (e.g., 12 V rail or MCU input); conducts surge current to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces |
| Halogen-free & RoHS-compliant | HM3 suffix confirms compliance with environmental standards and JEDEC JESD201 Class 2 whisker resistance |
| 400 W peak pulse power | Withstands high-energy transients per ISO 7637-2 and IEC 61000-4-5 without degradation |
| Fast response time | Sub-nanosecond avalanche turn-on ensures protection before sensitive ICs experience overvoltage damage |
| Low clamping ratio (VC/VBR) | ~1.42 - tight voltage margin between breakdown and clamping improves system-level surge margin |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply lines in body control modules against load-dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and LDO input to clamp spikes before regulation. Use Value: Limits voltage to ≤27.6 V during 400 W pulses, preventing LDO thermal shutdown and ensuring uninterrupted MCU operation. |
Use Scenario: Shielding analog outputs of pressure/temperature sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: TVS mounted at connector interface to shunt transients before signal conditioning amplifier. Use Value: Sub-ns response prevents amplifier saturation; low leakage (<1 μA at 17 V) avoids DC offset errors in precision measurement paths. |
| Consumer Device USB Port Protection | Telecom Equipment DC Input Protection |
Use Scenario: Safeguarding USB VBUS lines in portable chargers and docking stations from hot-plug and ESD events. IC Role / Device Role / Timing Role: Unidirectional TVS on VBUS path to ground, sized for 17 V nominal 5 V/9 V/12 V charging rails. Use Value: Clamps 8 kV contact ESD to <27.6 V within nanoseconds, preserving USB-PD controller integrity and maintaining enumeration reliability. |
Use Scenario: Protecting -48 V telecom rectifier outputs from lightning-induced surges on long-line feeds. IC Role / Device Role / Timing Role: TVS configured in series with fuse on DC input to absorb repetitive 10/1000 μs transients. Use Value: 400 W rating supports multi-event surge endurance; RθJA = 120 °C/W allows stable operation in enclosed chassis with limited airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17AHE3/H | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification | Acceptable where halogen-free requirement is not mandated (e.g., non-automotive industrial) | Select when cost sensitivity outweighs halogen-free mandate; identical footprint and performance |
| SMBJ17A-HM3 | Higher 600 W PPPM, larger SMB (DO-214AA) package, same VWM/VC ratings | Better suited for higher-energy transients where PCB space permits larger footprint | Choose when surge energy exceeds 400 W or thermal margin requires lower RθJA (SMBJ: RθJA ≈ 85 °C/W) |
Compared with SMAJ17AHM3/H, SMAJ17AHE3/H offers identical protection performance without halogen-free assurance, while SMBJ17A-HM3 provides 50% higher surge capacity in a larger package - enabling trade-offs between board area, environmental compliance, and transient energy headroom.
Availability
SMAJ17AHM3/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, consumer USB power delivery systems, and telecom DC input stages requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ17AHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 qualification, low clamping voltage, and repeatable surge endurance are mandatory.
FAQ
What is the clamping voltage of SMAJ17AHM3/H at its rated peak pulse current?
The SMAJ17AHM3/H clamps to a maximum of 27.6 V at its rated peak pulse current of 14.5 A under the standard 10/1000 μs waveform. This value is measured per IEC 61000-4-5 and ensures downstream circuitry remains within safe operating limits during surge events. The clamping voltage is guaranteed across the full operating temperature range and forms the basis for system-level surge margin calculations in designs using SMAJ17AHM3/H.
Is SMAJ17AHM3/H qualified for automotive applications?
Yes, SMAJ17AHM3/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in the 88390 datasheet. This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and surge endurance - making SMAJ17AHM3/H suitable for under-hood and cabin applications including body control modules, infotainment power supplies, and ADAS sensor protection circuits.
How does the HM3 suffix differ from E3 or HE3 in the SMAJ17A family?
The HM3 suffix on SMAJ17AHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. In contrast, E3 is RoHS-compliant but not halogen-free, and HE3 is RoHS-compliant and AEC-Q101 qualified but not halogen-free. All three share identical electrical characteristics and package dimensions, but only HM3 satisfies strict halogen-free mandates required in certain automotive and green-electronics programs.
What is the maximum reverse leakage current of SMAJ17AHM3/H at its standoff voltage?
At VWM = 17 V and TA = 25 °C, the SMAJ17AHM3/H exhibits a maximum reverse leakage current (ID) of 1.0 μA. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and minimizes standby power loss in battery-powered systems - a key design advantage confirmed in the Electrical Characteristics table of the Vishay 88390 datasheet for SMAJ17AHM3/H.
Can SMAJ17AHM3/H be used in bidirectional configurations?
No, SMAJ17AHM3/H is a unidirectional TVS diode, as indicated by the "A" (not "CA") suffix and cathode band marking. Bidirectional operation requires the "CA" variant (e.g., SMAJ17CA). Using SMAJ17AHM3/H in reverse-biased AC signal paths would result in forward conduction during negative half-cycles, potentially damaging the device or distorting signals - so SMAJ17AHM3/H must be applied only in DC-biased or polarity-defined protection scenarios.
SMAJ17AHM3/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:
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ17AHM3/H FAQ
1.How can I place an order for SMAJ17AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ17AHM3/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 SMAJ17AHM3/H reliable?
The price and inventory of SMAJ17AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ17AHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ17AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ17AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ17AHM3/H?
SMAJ17AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ17AHM3/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 SMAJ17AHM3/H?
For technical support, including SMAJ17AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ17AHM3/H requirements.
6.How does Aetrix verify that SMAJ17AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ17AHM3/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 SMAJ17AHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ17AHM3/H?
All SMAJ17AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ17AHM3/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 SMAJ17AHM3/H part is unused and in its original packaging.
Return procedure for SMAJ17AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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