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Vishay General Semiconductor - Diodes Division SMAJ170AHM3/I
- Part No.:
- SMAJ170AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ170AHM3/I.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ170AHM3/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 170 V stand-off voltage (VWM), 189–209 V breakdown voltage (VBR) at 1 mA, and clamps transients to ≤275 V at 1.09 A peak pulse current (IPPM), with 400 W peak pulse power (10/1000 μs waveform) and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMAJ170AHM3/I datasheet, SMAJ170AHM3/I pinout, SMAJ170AHM3/I application, or SMAJ170AHM3/I equivalent, this device serves as a halogen-free, RoHS-compliant, surface-mount TVS for high-reliability DC power rail and signal line protection where fast response (<1 ns), low clamping ratio, and stable thermal performance up to +150 °C junction temperature are required.
Technical Context
This unidirectional TVS operates by avalanche breakdown above its VWM threshold, delivering sub-nanosecond response to ESD and surge events. Its glass-passivated junction ensures stable leakage (<1.09 μA at 170 V) and repeatable clamping behavior across temperature (−55 °C to +150 °C).
The device is rated for 400 W peak pulse power (10/1000 μs) up to 78 V and 300 W above that-confirmed at 170 V-and exhibits a typical thermal resistance of 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads, enabling reliable operation without heatsinking in most automotive and industrial PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin for protected circuitry. |
| VBR (min/max) | 189 V / 209 V at IT = 1 mA - Confirmed breakdown range ensures predictable turn-on with tight tolerance for precision protection design. |
| VC @ IPPM | ≤275 V at IPPM = 1.09 A - Clamping voltage limits stress on downstream ICs (e.g., microcontrollers, MOSFET gates) during surge events. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak pulse power rating validated per 10/1000 μs waveform; supports IEC 61000-4-5 Level 3/4 surge immunity. |
| IFSM | 40 A - Peak forward surge current rating (8.3 ms half-sine) confirms robustness against inrush or fault currents in unidirectional configurations. |
| TJmax | +150 °C - Maximum junction temperature enables deployment in under-hood automotive environments and high-temperature industrial enclosures. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 2.54 mm lead pitch; compatible with automated pick-and-place and reflow soldering (MSL Level 1, 260 °C peak). |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; cathode indicated by band on body; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path; completes clamping loop during transient events. |
| Cathode | High-side connection point | Connected to protected line (e.g., 12 V rail, CAN_H); blocks reverse current until VBR exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units, infotainment power supplies, and ADAS sensor interfaces. |
| Halogen-free & RoHS-compliant | Meets global environmental compliance requirements (per Vishay HM3 suffix); suitable for export-controlled and green manufacturing programs. |
| 400 W peak pulse power (≤78 V) | Supports robust protection against ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 surges without derating in standard PCB layouts. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., inductive switch-off), improving protection margin for 3.3 V/5 V logic. |
| MSL Level 1 moisture sensitivity | Enables direct placement without baking; compatible with standard SMT reflow profiles up to 260 °C peak temperature. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V supply lines in automotive ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and LDO input to clamp spikes before regulation stage. Use Value: Clamps to ≤275 V at 1.09 A, limiting stress on downstream regulators and ensuring system reset integrity during ISO 7637-2 Pulse 5a events. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: TVS mounted directly at connector entry to shunt induced lightning surges on 4–20 mA current loops. Use Value: Sub-ns response and ≤275 V clamping prevent latch-up or damage to precision op-amps and ADC front-ends exposed to field wiring. |
| Telecom DC Power Input Protection | Consumer Device USB/DC Jack Protection |
|
Use Scenario: Securing −48 V telecom rectifier outputs against accidental AC coupling or lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS connected cathode-to-rail to absorb negative-going transients while blocking normal reverse bias. Use Value: 170 V VWM provides ample margin above nominal −48 V, and 300 W rating handles repetitive surges in central office environments. |
Use Scenario: Hardening 5 V/9 V/12 V DC input jacks on smart home hubs and portable audio devices against ESD and adapter faults. IC Role / Device Role / Timing Role: Primary-level TVS placed immediately after barrel jack to divert energy before polyfuse and DC-DC converter. Use Value: Low leakage (<1.09 μA) prevents standby current drain; SMA footprint allows compact layout near entry point without sacrificing surge margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ170AHE3/I | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | No difference in protection performance; differs only in material compliance (halogen content). | Select SMAJ170AHM3/I when halogen-free requirement is mandated (e.g., EU automotive Tier 1 specs). |
| SMBJ170A-M3/5A | Same VWM/VBR/VC, but SMB (DO-214AA) package: 30 % larger footprint, higher IPPM (1.2 A), lower RθJA (90 °C/W). | Better thermal handling for high-duty-cycle surges; requires larger PCB area and different pad layout. | Choose SMBJ170A-M3/5A if board space permits and thermal derating under repeated surges is critical. |
Compared with SMAJ170AHE3/I, SMAJ170AHM3/I adds halogen-free compliance without trade-offs in electrical performance; versus SMBJ170A-M3/5A, it offers identical protection in a smaller SMA footprint but with reduced thermal margin-ideal for space-constrained automotive modules where halogen restrictions apply.
Availability
SMAJ170AHM3/I is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom DC input safeguarding requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ170AHM3/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, automotive qualification, and industrial-grade performance.
The SMAJ series was developed specifically for surface-mount transient suppression in harsh environments-targeting automotive, industrial, and telecom applications demanding AEC-Q101 validation, low-profile packaging, and consistent clamping behavior across temperature.
FAQ
What is the maximum clamping voltage of SMAJ170AHM3/I at its rated peak pulse current?
The SMAJ170AHM3/I clamps to a maximum of 275 V at its specified peak pulse current of 1.09 A (10/1000 μs waveform). This value is measured and guaranteed per Vishay's datasheet (Document Number: 88390, Rev. 09-Jan-2024), and defines the upper voltage limit imposed on protected circuitry during surge events. Designers use this parameter to verify margin against the absolute maximum ratings of downstream components like MOSFETs or regulators in the SMAJ170AHM3/I-protected path.
Is SMAJ170AHM3/I suitable for automotive applications?
Yes, SMAJ170AHM3/I is AEC-Q101 qualified and explicitly designated for automotive use per Vishay's ordering code structure (HM3 suffix denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified). It meets requirements for under-hood and cabin modules-including engine control, body electronics, and ADAS sensor power rails-where sustained operation from −40 °C to +125 °C ambient and surge immunity per ISO 7637-2 are mandatory. The SMAJ170AHM3/I qualification data is documented in Vishay's compliance reports referenced in the datasheet.
How does the HM3 suffix differ from the HE3 suffix in SMAJ170A variants?
The HM3 suffix in SMAJ170AHM3/I indicates halogen-free, RoHS-compliant, and AEC-Q101 qualified construction, whereas HE3 denotes RoHS-compliant and AEC-Q101 qualified but not halogen-free. Both share identical electrical specifications (VWM = 170 V, VBR = 189–209 V, VC ≤ 275 V), thermal ratings, and package dimensions. The distinction lies solely in material composition-HM3 satisfies stricter halogen bans (e.g., IEC 61249-2-21), making SMAJ170AHM3/I appropriate for Tier 1 automotive supply chains with explicit halogen-free mandates.
What is the reverse leakage current of SMAJ170AHM3/I at its stand-off voltage?
At its rated stand-off voltage of 170 V and TA = 25 °C, the SMAJ170AHM3/I exhibits a maximum reverse leakage current (ID) of 1.09 μA. This value is confirmed in the "ELECTRICAL CHARACTERISTICS" table of the Vishay datasheet (Document Number: 88390) and reflects the device's ability to minimize standby power loss while maintaining high impedance below VWM. This low leakage supports energy-sensitive designs such as always-on automotive modules or battery-powered industrial sensors using SMAJ170AHM3/I.
Can SMAJ170AHM3/I be used in bidirectional configurations?
No, SMAJ170AHM3/I is a unidirectional TVS diode, as indicated by the "A" suffix (versus "CA" for bidirectional types like SMAJ170CA). Its cathode band marks polarity, and it conducts only in reverse breakdown-forward conduction is limited to ~3.5 V at 25 A (per datasheet note). For bidirectional protection, a separate part such as SMAJ170CA must be selected; substituting SMAJ170AHM3/I in a bidirectional circuit would result in improper clamping and potential failure during positive-going transients.
SMAJ170AHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 170V
- Voltage - Breakdown (Min):
- 189V
- Voltage - Clamping (Max) @ Ipp:
- 275V
- Current - Peak Pulse (10/1000µs):
- 1.09A
- 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)
SMAJ170AHM3/I FAQ
1.How can I place an order for SMAJ170AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ170AHM3/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 SMAJ170AHM3/I reliable?
The price and inventory of SMAJ170AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ170AHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ170AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ170AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ170AHM3/I?
SMAJ170AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ170AHM3/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 SMAJ170AHM3/I?
For technical support, including SMAJ170AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ170AHM3/I requirements.
6.How does Aetrix verify that SMAJ170AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ170AHM3/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 SMAJ170AHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ170AHM3/I?
All SMAJ170AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ170AHM3/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 SMAJ170AHM3/I part is unused and in its original packaging.
Return procedure for SMAJ170AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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