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Vishay General Semiconductor - Diodes Division SMAJ170A-M3/61
- Part No.:
- SMAJ170A-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ170A-M3/61.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ170A-M3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection 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 rating with 10/1000 μs waveform - deployed in automotive power supplies, industrial motor controllers, and telecom DC input stages.
For engineers reviewing the SMAJ170A-M3/61 datasheet, SMAJ170A-M3/61 pinout, SMAJ170A-M3/61 application, or SMAJ170A-M3/61 equivalent, key selection criteria include clamping performance under 1.09 A surge, thermal resistance (RθJA = 120 °C/W), halogen-free RoHS compliance (M3 suffix), and SMA (DO-214AC) package compatibility with automated SMT assembly.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its VBR range (189–209 V). Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at 170 V), while the low incremental surge resistance enables rapid energy diversion during transients induced by inductive switching or ESD events.
The device is rated for 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), supports operating junction temperatures from –55 °C to +150 °C, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak - confirming suitability for high-reliability commercial and automotive-grade PCB assemblies without derating penalties below 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating ceiling for protected circuitry. |
| VBR (min/max) | 189 V / 209 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on margin above VWM. |
| VC @ IPPM | 275 V at 1.09 A - Clamped voltage during full-rated 10/1000 μs transient; determines worst-case stress on downstream components. |
| PPPM | 400 W - Peak pulse power handling with 10/1000 μs waveform; validates protection capability against IEC 61000-4-5 surge events. |
| ID @ VWM | <1.0 μA - Reverse leakage at rated stand-off voltage; guarantees minimal standby power loss and signal integrity in high-impedance nodes. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs board-level thermal design for sustained surge duty cycles. |
| Package | SMA (DO-214AC) - Surface-mount outline with cathode band marking; compatible with JEDEC-standard pick-and-place and reflow profiles. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, polarity indicated by cathode band on unidirectional devices. Mounting uses 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal per Vishay recommended layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path (cathode-banded end is opposite) | Connected to lower-potential side of protected line; completes clamp path during reverse overvoltage. |
| Cathode | Avalanche breakdown terminal (marked with band) | Connected to higher-potential side (e.g., VBUS); initiates clamping when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables single-event suppression of 1 kV/500 A surges per IEC 61000-4-5 Level 4 without degradation. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and EU Directive 2015/863 for restricted substances. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; eliminates production delays in high-volume SMT lines. |
| Low clamping ratio (VC/VBR ≈ 1.36) | Minimizes let-through voltage during surge events, reducing stress on downstream MOSFETs, regulators, and interface ICs. |
| 150 °C max junction temperature | Supports operation in under-hood automotive environments and enclosed industrial enclosures without thermal shutdown. |
Applications
| Automotive Power Input Protection | Industrial Motor Drive DC Bus |
|---|---|
|
Use Scenario: 12 V/24 V battery-fed ECUs exposed to load-dump transients up to 120 V and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and primary DC/DC converter input. Use Value: Clamps load-dump spikes to ≤275 V within nanoseconds, preventing damage to 40 V-rated input MOSFETs and gate drivers. |
Use Scenario: 300–400 V DC bus in variable-frequency drives subject to regenerative braking overvoltage and IGBT switching noise. IC Role / Device Role / Timing Role: Parallel-mounted TVS across bus capacitors to absorb stored inductive energy during fault conditions. Use Value: Limits bus voltage overshoot to safe levels for 600 V IGBT modules, avoiding desaturation faults and capacitor overvoltage failure. |
| Telecom DC Power Entry | Consumer Appliance Main Supply |
|
Use Scenario: -48 V telecom rectifier outputs feeding PoE injectors and base station control boards vulnerable to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-stage TVS on input terminals upstream of EMI filters and secondary converters. Use Value: Withstands 10/1000 μs surges up to 400 W, meeting GR-1089-CORE Level 3 immunity requirements without derating. |
Use Scenario: AC/DC adapter outputs in washing machines and HVAC controllers subjected to mains-borne transients and relay contact bounce. IC Role / Device Role / Timing Role: Secondary-side TVS on 12–24 V logic rails protecting microcontrollers and sensor interfaces. Use Value: Sub-μA leakage preserves standby power budget; 275 V clamping prevents latch-up in 3.3 V/5 V digital ICs during 1 kV ring-wave events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ170A-E3/61 | Same electrical specs, but RoHS-compliant with lead-free solderability; lacks halogen-free certification (M3). | Preferred for non-automotive commercial designs where halogen content is not regulated. | Select E3 for cost-sensitive consumer electronics with standard RoHS compliance; verify halogen reporting requirements before substitution. |
| SMAJ170AHM3_A/H | AEC-Q101 qualified, same M3 halogen-free construction, packaged in 7" tape/reel (H code) instead of 61-code 7" reel. | Required for automotive OEM BOMs mandating AEC-Q101 qualification and traceable lot control. | Choose HM3_A/H only when automotive qualification and specific reel packaging are contractually required. |
Compared with SMAJ170A-M3/61, the E3 variant offers identical protection performance at lower cost for non-automotive use, while the HM3_A/H adds AEC-Q101 validation and alternate reel coding - neither is pin-compatible drop-in replacement without verifying qualification and packaging alignment in procurement systems.
Availability
SMAJ170A-M3/61 is available at Aetrix Electronics and suitable for automotive power modules, industrial motor drives, telecom rectifiers, and appliance main supply circuits requiring stable component supply with halogen-free compliance and MSL Level 1 handling.
Supply support for SMAJ170A-M3/61 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 targets high-energy transient suppression in harsh environments; SMAJ170A-M3/61 specifically addresses 170 V DC bus protection where fast clamping, low leakage, and halogen-free compliance are mandatory.
FAQ
What is the maximum clamping voltage of SMAJ170A-M3/61 under rated surge conditions?
The SMAJ170A-M3/61 exhibits a maximum clamping voltage (VC) of 275 V when subjected to its rated peak pulse current of 1.09 A with a 10/1000 μs waveform. This value is measured per Figure 1 in Vishay Document 88390 and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream components remain within their absolute maximum ratings.
Is SMAJ170A-M3/61 suitable for automotive applications?
SMAJ170A-M3/61 is halogen-free and RoHS-compliant but not AEC-Q101 qualified. For automotive use, Vishay specifies the SMAJ170AHM3_A/H variant with AEC-Q101 qualification. Engineers must select SMAJ170AHM3_A/H - not SMAJ170A-M3/61 - when automotive qualification is contractually required, as the M3/61 version lacks the necessary stress-test validation for under-hood deployment.
What does the "M3" suffix indicate in SMAJ170A-M3/61?
The "M3" suffix in SMAJ170A-M3/61 denotes halogen-free, RoHS-compliant construction per Vishay's material categorization standards. It confirms compliance with IEC 61249-2-21 and IPC-1752A for brominated flame retardants and chlorine content, distinguishing it from the "E3" (RoHS only) and "HM3" (AEC-Q101 + halogen-free) variants - essential for environmental compliance reporting in industrial and medical BOMs.
What is the thermal resistance of SMAJ170A-M3/61, and how does it affect layout?
SMAJ170A-M3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This value directly impacts PCB thermal design: larger copper areas or internal ground planes reduce RθJA, improving surge endurance during repetitive transients. Layouts must follow Vishay's DO-214AC pad dimensions to maintain rated power dissipation and avoid thermal runaway during multi-pulse events.
How does SMAJ170A-M3/61 differ from bidirectional SMAJ170CA variants?
SMAJ170A-M3/61 is unidirectional with cathode-band polarity and conducts only in reverse breakdown; SMAJ170CA is bidirectional, symmetrical, and suppresses transients in both directions without polarity marking. The "A" suffix indicates unidirectional function, while "CA" denotes bidirectional - making them electrically incompatible in circuits requiring directional clamping or DC biasing, such as automotive battery inputs or DC power rails.
SMAJ170A-M3/61 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:
- 300W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ170A-M3/61 FAQ
1.How can I place an order for SMAJ170A-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ170A-M3/61 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 SMAJ170A-M3/61 reliable?
The price and inventory of SMAJ170A-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ170A-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ170A-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ170A-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ170A-M3/61?
SMAJ170A-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ170A-M3/61 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 SMAJ170A-M3/61?
For technical support, including SMAJ170A-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ170A-M3/61 requirements.
6.How does Aetrix verify that SMAJ170A-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ170A-M3/61 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 SMAJ170A-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ170A-M3/61?
All SMAJ170A-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ170A-M3/61, 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 SMAJ170A-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ170A-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ170A-M3/61 Tags
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