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Alpha & Omega Semiconductor Inc. SMDJ170A
- Part No.:
- SMDJ170A
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ170A.pdf
- Description:
- 1CH 170V UNIDIRECTIONAL 3000W SM
- Quantity:
- Payment:
- Shipping:
Inventory:7,770
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Product details
Overview
SMDJ170A from Alpha & Omega Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. It features a 170 V reverse standoff voltage (VRWM), 189–209 V breakdown voltage (VBR) at 1 mA, 275 V maximum clamping voltage (VC) at 11 A peak pulse current, and 3000 W peak pulse power dissipation on a 10/1000 µs waveform - enabling robust protection for industrial motor drives and telecom power supplies.
For engineers reviewing the SMDJ170A datasheet, pinout, applications, or equivalent options, key selection criteria include clamping performance under 10/1000 µs surges, thermal resistance (RθJA = 75 °C/W), unidirectional polarity with cathode band marking, DO-214AB package compatibility, and compliance with JEDEC standards for surface-mount reliability and lead-free assembly.
Technical Context
The SMDJ170A operates as a silicon avalanche diode optimized for fast transient suppression. Its glass-passivated junction ensures stable breakdown characteristics, while its low-profile DO-214AB package supports high-current handling via solderable copper pad mounting (8.0 mm × 8.0 mm per terminal). The device exhibits a typical temperature coefficient of ΔVBR = 0.1% × VBR @ 25 °C × ΔT and responds in less than 1.0 ps from 0 V to breakdown.
Designed for non-repetitive surge events at ≤0.01% duty cycle, the SMDJ170A delivers 3000 W peak pulse power with 11 A IPPM at VC = 275 V. Its junction-to-ambient thermal resistance (75 °C/W) and junction-to-lead resistance (15 °C/W) are specified under standard PCB mounting conditions, supporting thermal design validation for sustained ambient temperatures up to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 170 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin. |
| VBR @ IT=1 mA | 189–209 V - Measured breakdown range confirming avalanche threshold consistency for reliable triggering. |
| VC @ IPPM=11 A | 275 V - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum transient stress. |
| PPPM | 3000 W - Peak pulse power rating; validates capability to absorb IEC 61000-4-5 Level 4 surges. |
| TJ max | +150 °C - Maximum junction temperature; sets upper limit for thermal design and derating curves. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 8 mm × 8 mm copper pads; enables PCB thermal layout planning. |
| IR @ VRWM | 2.0 µA - Reverse leakage at rated standoff voltage; ensures minimal standby power loss in high-impedance circuits. |
Pinout & Package
DO-214AB (SMC J-Bend) package: molded plastic case with matte tin lead-free plating, JEDEC-compliant outline, and cathode band marking for polarity identification. Mounted using solderable terminals per MIL-STD-750, Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward conduction mode | Connected to lower-potential side of protected line; not used during normal TVS operation (reverse-biased). |
| Cathode | Current exit point during avalanche clamping | Marked by color band; connects to higher-potential rail (e.g., VBUS); carries full surge current to ground path. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - Enables suppression before sensitive downstream components experience overvoltage stress. |
| Glass passivated junction | Stable VBR tolerance and long-term reliability under repeated surge exposure without parameter drift. |
| Low profile DO-214AB | Optimizes board space in high-density power modules while maintaining 3000 W surge capability. |
| MSL1 moisture sensitivity | Compatible with standard reflow profiles up to 260 °C peak, eliminating bake requirements pre-assembly. |
| UL 94V-0 flammability | Self-extinguishing plastic housing meets safety standards for enclosed industrial equipment. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of DC bus inputs against lightning-induced surges and switching transients in variable-frequency drives. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across input terminals to clamp positive-going transients to ground. Use Value: Limits transient voltage to 275 V at 11 A, preventing damage to rectifier bridges and IGBT gate drivers. | Use Scenario: Input-stage surge suppression in -48 V telecom power systems exposed to induced surges on long-line feeds. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between supply rail and chassis ground to divert common-mode energy. Use Value: Maintains 170 V DC operating margin while clamping 10/1000 µs surges within safe limits for downstream DC/DC converters. |
| Automotive Body Control Modules | Renewable Energy Inverters |
Use Scenario: Protection of 12 V/24 V battery-connected ECUs against load dump and ISO 7637-2 Pulse 5a transients. IC Role / Device Role / Timing Role: Primary clamping device on main power input, coordinated with upstream fuses and filters. Use Value: Withstands 3000 W pulses and operates reliably from -55 °C to +150 °C, meeting automotive under-hood thermal requirements. | Use Scenario: DC-link surge protection in solar inverters subjected to grid-switching transients and nearby lightning strikes. IC Role / Device Role / Timing Role: High-power TVS mounted directly across PV string inputs to limit voltage overshoot during fault clearing. Use Value: 275 V clamping voltage ensures IGBTs and capacitors remain within 80% of their rated voltage during worst-case 10/1000 µs 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 |
|---|---|---|---|
| SAC170A (Littelfuse) | Same VRWM (170 V), slightly higher VC (285 V @ 11 A), identical DO-214AB package and 3000 W rating. | Higher clamping voltage reduces margin for downstream components near absolute maximum ratings. | Select when legacy Littelfuse BOM alignment is required; verify system-level clamping margin. |
| 1.5KE170A (ON Semiconductor) | Through-hole DO-201 package, same electrical specs but incompatible mounting; 1.5 kW rating (lower than SMDJ170A's 3 kW). | Not suitable for high-density SMT designs; requires PCB real estate and wave-solder process. | Choose only for through-hole prototyping or legacy repair; not recommended for new SMT production. |
Compared with SAC170A and 1.5KE170A, the SMDJ170A provides superior power density (3000 W in DO-214AB), tighter thermal resistance (75 °C/W vs. >100 °C/W for axial packages), and native SMT compatibility - making it optimal for space-constrained, high-reliability industrial power systems.
Availability
SMDJ170A is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and renewable energy inverters requiring stable component supply, RoHS-compliant lead-free assembly, and consistent surge immunity performance across production batches.
Supply support for SMDJ170A 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
Alpha & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in high-efficiency MOSFETs, TVS diodes, and power ICs for industrial, computing, and consumer applications.
The SMDJ series is engineered specifically for high-power transient suppression in surface-mount power systems, emphasizing low clamping voltage, fast response, and JEDEC-standardized reliability for mission-critical DC bus protection.
FAQ
What is the maximum clamping voltage of the SMDJ170A under a 10/1000 µs surge?
The SMDJ170A has a maximum clamping voltage (VC) of 275 V when subjected to its rated peak pulse current of 11 A on a 10/1000 µs waveform. This value is measured per industry-standard test conditions and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream components like MOSFETs or controllers remain within safe operating ranges. The SMDJ170A maintains this clamping performance consistently across its specified operating temperature range.
Is the SMDJ170A unidirectional or bidirectional, and how is polarity identified?
The SMDJ170A is a unidirectional TVS diode, indicated by the "A" suffix (as opposed to "CA" for bidirectional variants). Polarity is marked by a cathode band on the DO-214AB package body - the banded end corresponds to the cathode terminal, which must be connected toward the higher-potential side of the protected line. This configuration allows the SMDJ170A to conduct only during positive transients relative to ground, making it ideal for DC rail protection where reverse voltage is not expected.
What is the thermal resistance specification for the SMDJ170A, and how does it impact PCB layout?
The SMDJ170A has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. This value assumes standard JEDEC test conditions and directly informs minimum copper area requirements: reducing pad size or omitting thermal vias increases RθJA, risking junction overheating during repetitive surges. For reliable operation at elevated ambient temperatures, designers should verify thermal derating using the published pulse derating curve and ensure adequate copper pour around both terminals.
Does the SMDJ170A meet lead-free and RoHS compliance requirements?
Yes, the SMDJ170A is a certified AOS Green Product: it is lead-free, RoHS compliant, and halogen-free per AOS' environmental policy. The device uses matte tin lead-free plating on its terminals and conforms to JEDEC J-STD-020 moisture sensitivity level 1 (MSL1), allowing use in standard Pb-free reflow processes with a maximum peak temperature of 260 °C. Full compliance documentation, including material declarations and test reports, is available through AOS' official product page and Aetrix Electronics' quality portal.
Can the SMDJ170A be used in automotive applications such as load dump protection?
The SMDJ170A is rated for an operating junction temperature range of -55 °C to +150 °C and withstands 3000 W peak pulse power, making it technically suitable for automotive body control module (BCM) protection against ISO 7637-2 Pulse 5a load dump transients. However, it is not AEC-Q200 qualified. For production automotive applications requiring qualification, engineers should consult AOS' AEC-Q200-certified TVS portfolio or validate the SMDJ170A per internal reliability testing protocols before deployment.
SMDJ170A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- 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):
- 11A
- Power - Peak Pulse:
- 3000W (3kW)
- 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-214AB
SMDJ170A FAQ
1.How can I place an order for SMDJ170A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ170A 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 SMDJ170A reliable?
The price and inventory of SMDJ170A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ170A is usually 5 days.
3.What payment methods are accepted for SMDJ170A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ170A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ170A?
SMDJ170A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ170A 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 SMDJ170A?
For technical support, including SMDJ170A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ170A requirements.
6.How does Aetrix verify that SMDJ170A is sourced from the original manufacturer or authorized distributors?
All SMDJ170A 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 SMDJ170A meets industry standards.
7.What is the process for return or replacement of SMDJ170A?
All SMDJ170A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ170A, 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 SMDJ170A part is unused and in its original packaging.
Return procedure for SMDJ170A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ170A Tags
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