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Vishay General Semiconductor - Diodes Division SMAJ170AHM3_A/I
- Part No.:
- SMAJ170AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ170AHM3_A/I.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,228
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Product details
Overview
SMAJ170AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 170 V stand-off voltage (VWM), 189–209 V breakdown voltage (VBR) at 1 mA, 275 V maximum clamping voltage (VC) at 1.09 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform). It is used to protect MOSFETs, ICs, and sensor signal lines in industrial power supplies and automotive control modules.
For engineers reviewing the SMAJ170AHM3_A/I datasheet, SMAJ170AHM3_A/I pinout, SMAJ170AHM3_A/I application, or SMAJ170AHM3_A/I equivalent, key selection criteria include clamping voltage margin relative to system rail, unidirectional polarity alignment with DC bias, thermal derating above 25 °C, and AEC-Q101 qualification status for automotive deployment.
Technical Context
This TVS diode operates as a voltage-clamping protection device triggered by transient overvoltage events exceeding its reverse stand-off voltage (VWM = 170 V). Its silicon avalanche junction provides sub-nanosecond response time and low incremental surge resistance, enabling effective suppression of ESD, lightning-induced surges, and inductive switching spikes.
The device is rated for 400 W peak pulse power (10/1000 μs) up to 78 V, and 300 W above 78 V - confirmed at 275 V clamping under 1.09 A IPPM. Its thermal resistance (RθJA = 120 °C/W) and junction temperature limit (TJ max = 150 °C) define safe operating area under repetitive surge conditions with PCB copper pad cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for protected line's nominal DC bias. |
| VBR (min/max) | 189 V / 209 V at IT = 1 mA - Confirmed breakdown range defining turn-on threshold; ensures reliable triggering above VWM with margin. |
| VC @ IPPM | 275 V at IPPM = 1.09 A - Clamped voltage during worst-case surge; determines maximum stress imposed on downstream ICs or MOSFETs. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak transient energy handling capability per 10/1000 μs waveform; defines survivability against standardized surge tests. |
| ID @ VWM | 1.0 μA - Reverse leakage at rated stand-off voltage; negligible power loss and minimal impact on high-impedance sensor or reference circuits. |
| TJ max | +150 °C - Maximum junction temperature; constrains ambient + power dissipation budget in enclosed or high-temperature environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with cathode band marking; compatible with automated placement and reflow soldering per J-STD-020 MSL level 1. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, polarity indicated by cathode band on unidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection in unidirectional configuration | Connected to ground or lowest potential node; completes clamping path when transient exceeds VBR. |
| Cathode | High-side connection; marked with band | Connected to protected line (e.g., 170 V rail); reverse-biased during normal operation, avalanches during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - enables use in engine control units and ADAS power rails. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets environmental compliance requirements for industrial and automotive OEMs without compromising surge robustness or thermal performance. |
| 400 W peak pulse power (≤78 V), 300 W (>78 V) | Supports IEC 61000-4-5 Level 3/4 surge immunity testing on 170 V DC bus lines with appropriate PCB layout (0.2″ × 0.2″ copper pads). |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage overshoot during clamping - critical for protecting gate oxides of 200 V-class MOSFETs in motor drives. |
| MSL level 1, peak reflow ≤ 260 °C | Enables single-pass lead-free reflow assembly without moisture sensitivity concerns or pre-bake requirements. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting 170 V intermediate bus in industrial AC/DC front-end converters from load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS placed across bulk capacitor output to clamp transients before they reach downstream DC/DC controllers. Use Value: Limits voltage excursion to ≤275 V during 1.09 A surge, preventing overvoltage failure of 300 V-rated primary-side MOSFETs and optocouplers. |
Use Scenario: Safeguarding LIN bus transceiver supply input in body control modules exposed to battery voltage transients. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V–170 V auxiliary rail feeding microcontroller power domains during cold-crank or jump-start events. Use Value: Clamps 100 V/10 ms pulses to <275 V within nanoseconds, preserving MCU reset logic integrity and avoiding brown-out resets. |
| Sensor Signal Line Protection | MOSFET Gate Driver Protection |
|
Use Scenario: Shielding analog output lines of high-voltage current sensors (e.g., shunt-based 170 V monitoring) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-leakage (1.0 μA) TVS placed at sensor connector interface to absorb ±8 kV contact ESD per IEC 61000-4-2. Use Value: Prevents latch-up or parametric shift in precision op-amps and ADC inputs while adding <0.1 % error at full-scale output. |
Use Scenario: Protecting high-side gate driver ICs in 170 V half-bridge inverters from Miller-induced voltage spikes during fast switching. IC Role / Device Role / Timing Role: Fast-response TVS connected between gate and source to clamp dv/dt-induced overshoot exceeding VGS rating. Use Value: Suppresses >200 V spikes to <275 V within <1 ns, eliminating false turn-on and gate oxide stress in 200 V GaN or SiC drivers. |
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_A/I | Same electrical specs, but RoHS-compliant commercial grade (non-halogen-free, non-AEC-Q101 qualified) | Lacks automotive qualification and halogen-free certification; suitable for industrial/commercial designs without Tier-1 OEM requirements | Select when AEC-Q101 and halogen-free are not mandated, and cost optimization is prioritized. |
| SMAJ170A-M3/5A | Identical electrical parameters and HM3 halogen-free material, but packaged in 13″ tape-and-reel (7500 pcs) vs. I-code (7500 pcs, AEC-Q101 qualified) | No functional difference; differs only in packaging format and qualification traceability - same die and process | Choose for high-volume production where reel logistics align, but verify HM3-AEC-Q101 traceability documentation is provided. |
Compared with SMAJ170AHM3_A/I, the HE3 variant omits AEC-Q101 validation and halogen-free compliance, limiting automotive use; the M3/5A shares materials and performance but lacks the explicit AEC-Q101 suffix and associated test reporting required for certified automotive BOMs.
Availability
SMAJ170AHM3_A/I is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, sensor interface protection, and MOSFET gate driver circuits requiring stable component supply with automotive-grade reliability and halogen-free compliance.
Supply support for SMAJ170AHM3_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 MOSFETs with emphasis on ruggedness, precision, and reliability.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where voltage surges threaten system uptime and safety-critical operation.
FAQ
What is the clamping voltage of SMAJ170AHM3_A/I at its rated peak pulse current?
The SMAJ170AHM3_A/I has a maximum clamping voltage (VC) of 275 V at its specified peak pulse current (IPPM) of 1.09 A, measured using the standard 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during transient events and is confirmed in the Vishay datasheet revision 09-Jan-2024, page 2. The SMAJ170AHM3_A/I maintains this clamping performance across its qualified operating temperature range.
Is SMAJ170AHM3_A/I qualified for automotive applications?
Yes, SMAJ170AHM3_A/I is AEC-Q101 qualified, as indicated by the "HM3" suffix and confirmed in the Vishay ordering information table (page 3) and thermal characteristics note. This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD, making SMAJ170AHM3_A/I suitable for under-hood and chassis-mounted automotive modules such as body control units and power distribution systems.
What does the "HM3" suffix mean in SMAJ170AHM3_A/I?
The "HM3" suffix in SMAJ170AHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering guide, HM3 parts meet JESD201 Class 2 whisker resistance and UL 94 V-0 flammability standards. This distinguishes SMAJ170AHM3_A/I from E3 (RoHS-only) and HE3 (AEC-Q101 but not halogen-free) variants, ensuring compliance for strict automotive and green-electronics programs.
How is polarity identified on SMAJ170AHM3_A/I?
SMAJ170AHM3_A/I is a unidirectional TVS diode, and polarity is marked by a cathode band located near one end of the SMA (DO-214AC) package. During circuit design, the banded end must be connected to the higher-potential side (e.g., 170 V rail), while the anode connects to ground or return. This orientation ensures proper reverse-bias operation and avalanche clamping during overvoltage events - incorrect placement renders the SMAJ170AHM3_A/I ineffective.
What is the thermal resistance of SMAJ170AHM3_A/I, and how does it affect layout?
The SMAJ170AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended copper pads (0.2″ × 0.2″ per terminal). To maintain TJ ≤ 150 °C under repetitive surge conditions, PCB layout must provide adequate copper area and avoid thermal bottlenecks. Derating curves in Figure 2 of the Vishay datasheet show power capability drops significantly above 25 °C ambient - underscoring the need for thermal-aware routing in high-power or enclosed applications using SMAJ170AHM3_A/I.
SMAJ170AHM3_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):
- 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_A/I FAQ
1.How can I place an order for SMAJ170AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ170AHM3_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 SMAJ170AHM3_A/I reliable?
The price and inventory of SMAJ170AHM3_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 SMAJ170AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ170AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ170AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ170AHM3_A/I?
SMAJ170AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ170AHM3_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 SMAJ170AHM3_A/I?
For technical support, including SMAJ170AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ170AHM3_A/I requirements.
6.How does Aetrix verify that SMAJ170AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ170AHM3_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 SMAJ170AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ170AHM3_A/I?
All SMAJ170AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ170AHM3_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 SMAJ170AHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ170AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ170AHM3_A/I Tags
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