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Vishay General Semiconductor - Diodes Division SMAJ170AHM3_A/H
- Part No.:
- SMAJ170AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ170AHM3_A/H.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ170AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients up to 275 V at 1.09 A peak pulse current, with 400 W peak pulse power (10/1000 μs), 170 V stand-off voltage, and 189–209 V breakdown voltage range - deployed for overvoltage protection of power rails and signal lines in automotive ECUs and industrial motor drives.
For engineers reviewing the SMAJ170AHM3_A/H datasheet, SMAJ170AHM3_A/H pinout, SMAJ170AHM3_A/H application, or SMAJ170AHM3_A/H equivalent, key selection criteria include clamping voltage (VC = 275 V), unidirectional polarity, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This TVS diode operates as a fast-acting shunt protector: under normal bias it presents high impedance (>1 μA leakage at 170 V), but triggers avalanche conduction when reverse voltage exceeds 189 V (min VBR), clamping transient energy within 1 ns response time. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance.
Rated for 40 A peak forward surge current (8.3 ms half-sine), it supports repetitive transient suppression in systems with duty cycle ≤0.01 %, derated above 25 °C per Fig. 2. The SMA package enables automated placement and meets MSL Level 1 (260 °C reflow peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 170 V - maximum continuous reverse operating voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 189–209 V at 1.0 mA - guaranteed avalanche initiation range defining turn-on threshold |
| Clamping Voltage (VC) | 275 V at IPPM = 1.09 A - peak voltage seen by protected circuit during 10/1000 μs transient |
| Peak Pulse Power (PPPM) | 400 W (≤78 V); 300 W (>78 V) - energy-handling capacity under standard 10/1000 μs waveform |
| Leakage Current (ID) | 1.09 μA max at 170 V - minimal loading on protected line during normal operation |
| Junction Temperature Range | −55 °C to +150 °C - operational envelope supporting under-hood automotive and industrial environments |
| Package | SMA (DO-214AC) - surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal requirement |
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 reference terminal | Connected to ground or lowest potential node; defines current path during clamping |
| Cathode | High-side transient input terminal | Connected to protected line; avalanche conduction occurs from cathode to anode when VREV > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Halogen-free & RoHS-compliant (HM3) | Meets JESD201 Class 2 whisker resistance and UL 94 V-0 flammability for safety-critical assemblies |
| 400 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-earth) with appropriate PCB layout |
| 1 ns typical response time | Clamps transients before downstream ICs (e.g., MCU GPIO, CAN transceivers) experience overstress |
| Low incremental surge resistance | Minimizes voltage overshoot during high-di/dt events such as relay coil de-energization |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive Control |
|---|---|
Use Scenario: Suppressing load-dump spikes (up to 35 V, 100 ms) and alternator ripple on 12 V battery-fed microcontroller power inputs in engine control units. IC Role / Device Role: Unidirectional shunt clamp placed between VCC and GND, triggered only during overvoltage events. Use Value: Limits voltage to ≤275 V during 400 W transients, preventing latch-up or gate oxide damage in 3.3 V/5 V logic supplies. |
Use Scenario: Protecting gate drivers and current-sense amplifiers from inductive kickback when PWM-controlling 24–48 V DC motors. IC Role / Device Role: Mounted across motor winding terminals or driver supply rails to clamp flyback energy. Use Value: Withstands 40 A surge current (8.3 ms) and clamps at 275 V, enabling robust operation without snubber redesign. |
| Telecom Line Interface Protection | Consumer Appliance Power Supply Input |
Use Scenario: Safeguarding RS-485 transceivers and Ethernet PHYs against lightning-induced surges on outdoor data lines. IC Role / Device Role: First-stage protection device on differential pairs, paired with common-mode chokes and GDTs. Use Value: Low capacitance (<50 pF at 1 MHz) avoids signal integrity degradation while providing 400 W transient dissipation. |
Use Scenario: Guarding AC-DC adapter primary-side rectifier outputs and secondary-side 12 V/24 V rails against mains-borne surges. IC Role / Device Role: Parallel-connected TVS on DC output to absorb residual transients escaping upstream MOVs. Use Value: 170 V stand-off allows compatibility with 120 VAC-derived 170 VDC rails; 150 °C TJMAX supports enclosed thermal environments. |
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/H | Same electrical specs, but RoHS-compliant commercial grade (E3) instead of halogen-free (HM3); no AEC-Q101 qualification | Lacks automotive qualification; suitable for industrial/commercial designs not requiring AEC-Q101 | Select SMAJ170AHE3_A/H if halogen-free content is not mandated and automotive qualification is unnecessary. |
| SMBJ170A-HM3 | Higher 600 W peak pulse power (10/1000 μs), same VWM/VBR/VC, but SMB (DO-214AA) package - 2.5× larger footprint | Offers greater surge margin but requires PCB layout change; thermal resistance RθJA = 85 °C/W vs. 120 °C/W | Choose SMBJ170A-HM3 where higher energy handling is critical and board space permits larger package. |
Compared with SMAJ170AHM3_A/H, SMAJ170AHE3_A/H trades halogen-free construction and AEC-Q101 for lower cost, while SMBJ170A-HM3 increases surge capability at the expense of footprint and thermal performance - both require validation for mechanical fit and system-level clamping behavior.
Availability
SMAJ170AHM3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial motor control, telecom infrastructure, and consumer appliance designs requiring stable component supply with halogen-free, AEC-Q101-qualified TVS protection.
Supply support for SMAJ170AHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series delivers standardized, high-reliability TVS diodes optimized for automotive, industrial, and telecom surge protection - engineered for fast response, precise clamping, and robust thermal performance in compact surface-mount packages.
FAQ
What is the clamping voltage of the SMAJ170AHM3_A/H under a 10/1000 μs transient?
The SMAJ170AHM3_A/H has a maximum clamping voltage (VC) of 275 V when subjected to its rated peak pulse current of 1.09 A using the standard 10/1000 μs waveform. This value is measured per Figure 1 in the Vishay datasheet 88390 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ170AHM3_A/H maintains this clamping performance across its specified operating temperature range.
Is the SMAJ170AHM3_A/H qualified for automotive applications?
Yes, the SMAJ170AHM3_A/H is AEC-Q101 qualified, as confirmed by the HM3 suffix and documentation in Vishay's ordering information table (page 3 of datasheet 88390). This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD, making the SMAJ170AHM3_A/H suitable for under-hood and chassis-mounted automotive modules where reliability under harsh conditions is mandatory.
What does the "HM3" suffix indicate in SMAJ170AHM3_A/H?
"HM3" denotes halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance, per Vishay's mechanical data section. It distinguishes the part from E3 (RoHS-compliant only) and HE3/HM3 variants with AEC-Q101 qualification. The "_A/H" indicates tape-and-reel packaging in 7-inch reels (1800 units), with revision code "A". The SMAJ170AHM3_A/H thus combines environmental compliance, reliability certification, and standardized logistics formatting.
How does the thermal resistance of SMAJ170AHM3_A/H affect PCB layout?
The SMAJ170AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures below 150 °C, designers must ensure adequate copper area and avoid excessive ambient temperature rise. Reducing pad size or omitting thermal vias significantly degrades RθJA and risks thermal runaway during repetitive surges.
Can SMAJ170AHM3_A/H be used in bidirectional circuits?
No - SMAJ170AHM3_A/H is a unidirectional TVS diode, as indicated by the "A" (not "CA") suffix and presence of cathode band marking. It conducts only in reverse bias above VBR and blocks forward current beyond VF ≈ 3.5 V at 25 A. For bidirectional protection, the SMAJ170CA-HM3 variant must be selected; mixing unidirectional and bidirectional types in the same design risks failure during AC-coupled or symmetrical transient events.
SMAJ170AHM3_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):
- 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/H FAQ
1.How can I place an order for SMAJ170AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ170AHM3_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 SMAJ170AHM3_A/H reliable?
The price and inventory of SMAJ170AHM3_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 SMAJ170AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ170AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ170AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ170AHM3_A/H?
SMAJ170AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ170AHM3_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 SMAJ170AHM3_A/H?
For technical support, including SMAJ170AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ170AHM3_A/H requirements.
6.How does Aetrix verify that SMAJ170AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ170AHM3_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 SMAJ170AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ170AHM3_A/H?
All SMAJ170AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ170AHM3_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 SMAJ170AHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ170AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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