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Vishay General Semiconductor - Diodes Division SMAJ170CAHM3_A/H
- Part No.:
- SMAJ170CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ170CAHM3_A/H.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ170CAHM3_A/H from Vishay General Semiconductor is a bidirectional 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), suitable for protecting MOSFETs and sensor interfaces in automotive power systems.
For engineers reviewing the SMAJ170CAHM3_A/H datasheet, SMAJ170CAHM3_A/H pinout, SMAJ170CAHM3_A/H application, or SMAJ170CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 170 V operating voltage window, low thermal resistance (RθJL = 30 °C/W), and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker test.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche behavior in both directions due to its bidirectional structure. Its glass-passivated junction enables fast response time (<1 ns) and stable clamping under repetitive surge conditions up to 0.01% duty cycle.
The SMAJ170CAHM3_A/H is rated for 150 °C maximum junction temperature and derates linearly above 25 °C ambient, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). It meets UL 497B recognition and is qualified to AEC-Q101 for automotive underhood applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe working range for 12 V/24 V/48 V automotive subsystems. |
| VBR min/max | 189 V / 209 V at 1 mA - Confirmed breakdown threshold ensures reliable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM | 275 V at 1.09 A - Clamping voltage limits downstream component stress during 10/1000 μs surge; critical for IGBT/MOSFET gate protection. |
| PPPM | 400 W (≤78 V); 300 W (>78 V) - Peak pulse power rating determines survivability against ISO 7637-2 Pulse 1/2/5a transients in vehicle electronics. |
| TJ max | +150 °C - Enables operation in high-temperature engine bay environments without thermal shutdown or parameter drift. |
| RθJL | 30 °C/W - Low junction-to-lead thermal resistance supports efficient heat transfer to PCB copper pads, improving reliability under repeated surges. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm × 4.50 mm footprint; 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-unmarked for bidirectional configuration; terminals solderable per J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; symmetrical with cathode in bidirectional mode | Enables clamping in both voltage polarities - no circuit polarity dependency required during layout. |
| Cathode | Current exit point in forward bias; symmetrical with anode in bidirectional mode | Eliminates need for orientation-aware placement; simplifies PCB routing and BOM management. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood use including temperature cycling, humidity, and mechanical shock per JESD22 standards. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets automotive environmental compliance requirements and JESD201 Class 2 whisker resistance for long-term solder joint integrity. |
| 400 W peak pulse power (10/1000 μs) | Withstands high-energy transients such as load dump (ISO 16750-2) and alternator ripple without degradation. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns response), reducing risk of IC latch-up or gate oxide damage. |
| UL 497B recognized (QVGQ2) | Approved for use in telecom and industrial signal line protection where regulatory safety certification is mandatory. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V power rails in body control modules (BCM) and junction boxes from ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 5a (load dump). IC Role / Device Role / Timing Role: Bidirectional clamping TVS placed across input terminals of DC-DC converters and power management ICs. Use Value: Limits transient voltage to ≤275 V, preventing overvoltage failure of downstream PMICs and microcontrollers while maintaining system uptime. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) of pressure/temperature sensors in factory automation equipment. IC Role / Device Role / Timing Role: Parallel-connected TVS on signal + and signal − lines to suppress ESD and EFT bursts per IEC 61000-4-2/4-4. Use Value: Maintains signal integrity by clamping transients below 275 V without loading the 1 kΩ loop impedance or introducing capacitance-induced distortion. |
| Telecom Line Card Surge Protection | Consumer Appliance Motor Drive Inputs |
|
Use Scenario: Safeguarding Ethernet PHY power pins and auxiliary bias rails in outdoor telecom base station line cards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS on 3.3 V/5 V bias supplies feeding PHY ICs and clock buffers. Use Value: Absorbs up to 400 W surge energy without failure, enabling compliance with GR-1089-CORE Level 3 immunity requirements. |
Use Scenario: Protecting H-bridge gate driver inputs in smart home appliance motor controllers (e.g., washing machine drum drives) from commutation spikes. IC Role / Device Role / Timing Role: Bidirectional clamp between gate driver supply and ground to suppress cross-talk and shoot-through-inducing transients. Use Value: Prevents false triggering of half-bridge FETs by limiting spike amplitude to <275 V, eliminating unintended motor stall or torque loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ170CAHE3_A/H | Same electrical specs, but RoHS-compliant with lead-based finish (not halogen-free); lacks JESD201 Class 2 whisker rating. | Acceptable for commercial-grade automotive modules not requiring halogen-free compliance or extended reliability testing. | Select when cost sensitivity outweighs halogen-free requirement and whisker resistance is non-critical. |
| SMBJ170CAHM3_A/H | Same VWM/VBR/VC ratings, but SMB (DO-214AA) package - 20 % larger footprint and higher RθJA (150 °C/W vs. 120 °C/W). | Better suited for lower-power circuits or less thermally constrained layouts where board space permits larger package. | Choose only if thermal margin is sufficient and existing SMB footprint reuse is prioritized over miniaturization. |
Compared with SMAJ170CAHM3_A/H, the HE3 variant trades halogen-free content and whisker resistance for lower unit cost, while the SMBJ variant sacrifices board area efficiency and thermal performance for slightly higher surge robustness margin in less dense designs.
Availability
SMAJ170CAHM3_A/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom line card surge suppression, and consumer appliance motor drive inputs requiring stable component supply across production lifecycles.
Supply support for SMAJ170CAHM3_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, rectifiers, and protection devices with emphasis on reliability, automotive qualification, and application-specific performance.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness against ESD, EFT, and surge events is mission-critical.
FAQ
What does the 'HM3' suffix indicate in SMAJ170CAHM3_A/H?
The HM3 suffix denotes halogen-free, RoHS-compliant construction with matte tin-plated leads that meet JESD201 Class 2 whisker resistance requirements. This makes SMAJ170CAHM3_A/H suitable for automotive applications where material compliance and long-term solder joint reliability are mandatory. The 'A/H' revision code confirms the latest manufacturing release per Vishay Document Number 88390.
Is SMAJ170CAHM3_A/H unidirectional or bidirectional?
SMAJ170CAHM3_A/H is a bidirectional TVS diode, as confirmed by the 'CA' suffix in its part number. It provides symmetrical clamping in both polarities, with identical breakdown and clamping characteristics for positive and negative transients. No polarity marking is present on the SMA package, distinguishing it from unidirectional variants like SMAJ170A.
Does SMAJ170CAHM3_A/H meet AEC-Q101 qualification?
Yes, SMAJ170CAHM3_A/H is AEC-Q101 qualified, as explicitly stated in the Vishay datasheet under "Mechanical Data" and "Ordering Information." This qualification covers temperature cycling, humidity, mechanical shock, and other stress tests required for automotive underhood components, making SMAJ170CAHM3_A/H appropriate for engine control units and battery management systems.
What is the maximum clamping voltage VC for SMAJ170CAHM3_A/H?
The maximum clamping voltage VC for SMAJ170CAHM3_A/H is 275 V at a peak pulse current IPPM of 1.09 A, measured using the standard 10/1000 μs waveform. This value is critical for ensuring downstream components such as MOSFETs and gate drivers remain within their absolute maximum voltage ratings during surge events.
Can SMAJ170CAHM3_A/H be used in place of SMAJ170A in a design?
No - SMAJ170CAHM3_A/H is bidirectional while SMAJ170A is unidirectional, so direct substitution requires circuit review. SMAJ170A has a cathode band marking and conducts only in reverse bias, whereas SMAJ170CAHM3_A/H clamps equally in both directions with no polarity marking. Using SMAJ170CAHM3_A/H in a unidirectional circuit may cause unintended conduction paths or increased leakage.
SMAJ170CAHM3_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:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ170CAHM3_A/H FAQ
1.How can I place an order for SMAJ170CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ170CAHM3_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 SMAJ170CAHM3_A/H reliable?
The price and inventory of SMAJ170CAHM3_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 SMAJ170CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ170CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ170CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ170CAHM3_A/H?
SMAJ170CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ170CAHM3_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 SMAJ170CAHM3_A/H?
For technical support, including SMAJ170CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ170CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ170CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ170CAHM3_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 SMAJ170CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ170CAHM3_A/H?
All SMAJ170CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ170CAHM3_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 SMAJ170CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ170CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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