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Vishay General Semiconductor - Diodes Division SMAJ170A-E3/61
- Part No.:
- SMAJ170A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ170A-E3/61.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,544
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Product details
Overview
SMAJ170A-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 170 V stand-off voltage (VWM), 189–209 V breakdown voltage (VBR) at 1 mA, clamps transients to ≤275 V at 1.09 A peak pulse current (IPPM), and delivers 400 W peak pulse power (10/1000 μs waveform) - ideal for safeguarding MOSFETs and sensor interfaces in industrial motor drives.
For engineers reviewing the SMAJ170A-E3/61 datasheet, SMAJ170A-E3/61 pinout, SMAJ170A-E3/61 application, or SMAJ170A-E3/61 equivalent, key selection criteria include unidirectional polarity, SMA (DO-214AC) package compatibility, 150 °C max junction temperature, low leakage (<1.0 μA at 170 V), and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below VWM = 170 V and rapidly avalanches above VBR (min 189 V) to limit transient voltages. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1.0 ns), enabling effective suppression of ESD, inductive switching spikes, and lightning-induced surges.
Thermally, it exhibits RθJA = 120 °C/W and RθJL = 30 °C/W, requiring minimum 0.2" × 0.2" copper pads per terminal for rated 400 W pulse handling. Derating applies above TA = 25 °C per Figure 2, with maximum IFSM = 40 A (8.3 ms half-sine) and TJ range of –55 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin. |
| VBR @ IT = 1 mA | 189–209 V - Confirmed avalanche onset range; ensures reliable triggering above system nominal voltage. |
| VC @ IPPM = 1.09 A | ≤275 V - Clamped voltage during 10/1000 μs surge; determines protected circuit's maximum stress level. |
| PPPM | 400 W - Peak pulse power rating (10/1000 μs); supports single-event surge immunity in industrial environments. |
| IDR @ VWM | ≤1.0 μA - Reverse leakage at 170 V; negligible power loss and no measurable loading on high-impedance nodes. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood or enclosed power electronics. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with cathode band marking; compatible with automated SMT placement. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 (260 °C reflow peak). Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VLINE exceeds VBR. |
| Anode (unbanded end) | Reference / return path | Typically tied to system ground or low-impedance return; completes clamping path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables single-event suppression of high-energy transients common in 24–48 V industrial control systems. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (<1 ns response), improving protection margin. |
| MSL Level 1 compliance | Supports standard Pb-free reflow without preconditioning; eliminates moisture-related popcorning risk. |
| AEC-Q101 qualification option | HE3/HM3 variants available for automotive applications requiring validated reliability in harsh environments. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and feedback sensors against inductive kickback from relay coils and solenoid loads. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed across DC bus or signal inputs to limit voltage excursions to <275 V. Use Value: Prevents latch-up or permanent damage to 200 V-rated MOSFETs and isolated amplifiers during 400 W surge events. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins from load dump and jump-start transients. IC Role / Device Role / Timing Role: Standoff-rated TVS on power input and data lines to clamp >100 V spikes within nanoseconds. Use Value: Maintains communication integrity and prevents reset faults during ISO 7637-2 Pulse 5a (load dump) events. |
| Telecom Power Supplies | Consumer Appliance Control Boards |
|
Use Scenario: Input-stage protection for 48 V telecom rectifiers exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS on DC input rail, coordinated with upstream MOVs for staged energy absorption. Use Value: Limits let-through voltage to <275 V while surviving repeated 400 W pulses per IEC 61000-4-5 Level 4. |
Use Scenario: Overvoltage guard for microcontroller ADC inputs monitoring thermistor or voltage divider networks. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 μA) TVS placed directly at IC pin to avoid measurement drift or bias error. Use Value: Preserves analog accuracy while providing ESD immunity up to ±30 kV (contact) per IEC 61000-4-2. |
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-M3/61 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package. | No functional difference; selected where halogen-free materials are mandated in final assembly. | Choose M3/61 for green manufacturing compliance without design or layout changes. |
| SMAJ170AHE3_A/H | AEC-Q101 qualified version; same VWM, VBR, and PPPM, but validated for automotive temperature and life testing. | Required for automotive ECUs; not necessary for commercial/industrial use unless extended reliability is specified. | Select HE3_A/H only when automotive qualification (e.g., body electronics, ADAS power domains) is contractually required. |
Compared with SMAJ170A-M3/61 and SMAJ170AHE3_A/H, the SMAJ170A-E3/61 offers standard commercial-grade RoHS compliance and serves as the baseline cost-optimized variant - ideal for non-automotive applications where halogen-free or AEC-Q101 validation are not mandated.
Availability
SMAJ170A-E3/61 is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, consumer appliance control boards, and automotive body control modules requiring stable component supply and consistent lead-time performance.
Supply support for SMAJ170A-E3/61 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 is part of Vishay's TRANSZORB® TVS platform, engineered for high-energy transient suppression in space-constrained, high-reliability power and signal protection applications across industrial, automotive, and telecom markets.
FAQ
What is the maximum clamping voltage of SMAJ170A-E3/61 under surge conditions?
The SMAJ170A-E3/61 clamps to a maximum of 275 V when subjected to its rated peak pulse current of 1.09 A (10/1000 μs waveform). This value is measured per standard test conditions in the Vishay datasheet (Document Number: 88390, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during transient events. Designers must ensure downstream components tolerate this clamped voltage.
Is SMAJ170A-E3/61 unidirectional or bidirectional?
SMAJ170A-E3/61 is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. It conducts only in reverse bias above VBR, making it suitable for DC rail protection where polarity is fixed. Bidirectional variants (e.g., SMAJ170CA) are designated with "CA" and lack polarity marking - SMAJ170A-E3/61 must not be substituted for CA types without circuit review.
Does SMAJ170A-E3/61 meet automotive qualification standards?
The base SMAJ170A-E3/61 is a commercial-grade part and not AEC-Q101 qualified. However, Vishay offers the SMAJ170AHE3_A/H variant - identical in all electrical and mechanical specifications - which is fully AEC-Q101 qualified for automotive applications. For automotive designs, specify the HE3 suffix; SMAJ170A-E3/61 itself is intended for industrial and consumer use.
What is the thermal resistance of SMAJ170A-E3/61, and how does it affect layout?
SMAJ170A-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W. To achieve rated 400 W pulse power, the datasheet mandates mounting on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Insufficient copper area will cause excessive junction heating and derated surge capability - layout must follow Vishay's recommended pad dimensions in Document 88390.
Can SMAJ170A-E3/61 replace SMAJ150A or SMAJ188A in the same footprint?
Yes - all SMAJ-series devices, including SMAJ170A-E3/61, SMAJ150A, and SMAJ188A, share the identical SMA (DO-214AC) package and pinout. They are mechanically interchangeable on PCBs designed for the SMA outline. However, electrical differences matter: SMAJ170A-E3/61 has VWM = 170 V, while SMAJ150A is rated for 150 V and SMAJ188A for 188 V. Substitution requires verification that the new VWM and VC align with system voltage margins and protection goals.
SMAJ170A-E3/61 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-E3/61 FAQ
1.How can I place an order for SMAJ170A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ170A-E3/61 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-E3/61 reliable?
The price and inventory of SMAJ170A-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ170A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ170A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ170A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ170A-E3/61?
SMAJ170A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ170A-E3/61 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-E3/61?
For technical support, including SMAJ170A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ170A-E3/61 requirements.
6.How does Aetrix verify that SMAJ170A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ170A-E3/61 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-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ170A-E3/61?
All SMAJ170A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ170A-E3/61, 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-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ170A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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