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Diodes Incorporated DFLT170A-7
- Part No.:
- DFLT170A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- POWERDI®123
- Datasheet:
-
DFLT170A-7.pdf
- Description:
- TVS DIODE 170VWM 281VC PWRDI 123
- Quantity:
- Payment:
- Shipping:
Inventory:2,800
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Product details
Overview
DFLT170A-7 from Diodes Incorporated is a unidirectional transient voltage suppressor (TVS) diode in PowerDI123 package, designed for overvoltage protection of DC power rails and signal lines. It features 170V reverse standoff voltage, 281V maximum clamping voltage at 0.81A peak pulse current, 225W peak pulse power (10/1000µs), and operates from –65°C to +150°C - used in automotive infotainment power supply input stages.
For engineers reviewing the DFLT170A-7 datasheet, DFLT170A-7 pinout, DFLT170A-7 application, or DFLT170A-7 equivalent, key selection criteria include clamping voltage margin relative to protected IC VMAX, IPP capability under ISO 7637-2 Pulse 1/2a/5a waveforms, thermal resistance (RθJS = 6°C/W), and AEC-Q101 qualification status for automotive deployment.
Technical Context
This TVS diode employs a planar silicon avalanche structure optimized for fast response (<1 ps typical) to transient events and low leakage (<5 µA at VRWM). Its unidirectional configuration provides asymmetric clamping: forward conduction begins near 0.7V while reverse breakdown initiates at 189–209V with tight 5% tolerance.
The device is rated for 225W peak pulse power per 10/1000µs waveform and supports 40A non-repetitive surge current (8.3ms half-sine), with thermal design enabled by low junction-to-solder-point resistance (6°C/W) and FR-4 PCB mounting guidance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Standoff Voltage (VRWM) | 170 V - Maximum continuous DC voltage before significant leakage; sets upper limit for protected circuit operating voltage. |
| Breakdown Voltage (VBR) | 189–209 V @ 1.0 mA - Confirmed avalanche onset range; ensures reliable triggering above system nominal rail. |
| Max Clamping Voltage (VC) | 281 V @ IPP = 0.81 A - Peak voltage seen by downstream circuit during worst-case transient; defines protection margin. |
| Peak Pulse Power (PPK) | 225 W (10/1000µs) - Sustained energy absorption capacity; validates compliance with IEC 61000-4-5 Level 3. |
| Junction-to-Solder Thermal Resistance | 6 °C/W - Enables accurate PCB copper pad thermal design for repeated surge duty cycles without thermal runaway. |
| Operating Temperature Range | –65°C to +150°C - Supports under-hood automotive placement and industrial ambient extremes. |
Pinout & Package
Package: PowerDI123 - surface-mount, single-cathode-band marking, 3-pin outline (anode/cathode/tab), green molded plastic, UL 94V-0 rated, 0.01 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode Band (Pin 1) | Transient Current Sink | Connected to protected line; conducts surge current to ground when voltage exceeds VBR. |
| Anode (Pin 2) | Reference Node | Typically tied to system ground or low-impedance return path; completes clamping loop. |
| Tab / Exposed Cathode Pad | Thermal & Electrical Path | Integral cathode connection and primary heat dissipation surface; must be soldered to ≥1 in² 2 oz Cu pad. |
Key Features
| Feature | Design Value |
|---|---|
| 225W Peak Pulse Power (10/1000µs) | Validates robustness against ISO 7637-2 Pulse 5a (load dump) in 12V automotive systems. |
| Low Clamping Ratio (VC/VBR ≈ 1.42) | Minimizes stress on downstream 300V-rated MOSFETs or CAN transceivers during transients. |
| RθJS = 6°C/W | Enables >1000 surge cycles at 0.5 Hz without derating when mounted per recommended pad layout. |
| AEC-Q101 Qualified Variant Available | DFLT170AQ-7 offers PPAP-capable manufacturing and IATF 16949 process control for Tier 1 automotive BOMs. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Clamp |
|---|---|
Use Scenario: 12V battery feed to telematics control unit exposed to load dump pulses up to 120V. IC Role / Device Role: Primary overvoltage clamp placed upstream of DC-DC converter input. Use Value: Limits transient voltage to ≤281V, preserving input capacitor and controller IC reliability under ISO 7637-2 Pulse 5a. |
Use Scenario: 24V analog sensor output line routed through noisy factory floor wiring harnesses. IC Role / Device Role: Point-of-entry protection at sensor interface connector. Use Value: Suppresses ESD and inductive switching spikes below 281V while adding <1 pF capacitance at 170V bias. |
| Telecom DC Power Feeds | Motor Drive Control Logic Protection |
Use Scenario: -48V telecom rectifier output feeding base station backplane with shared ground. IC Role / Device Role: Bidirectional rail clamp (used with complementary TVS) on power distribution node. Use Value: Absorbs 225W surges without degradation, maintaining <5 µA leakage at nominal -48V operation. |
Use Scenario: 24V logic supply for gate drivers in HVAC inverter modules subject to motor commutation noise. IC Role / Device Role: Localized clamp on microcontroller VDD rail adjacent to high-side driver IC. Use Value: Prevents latch-up in 3.3V logic by clamping transients before they propagate through LDO regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ170A (Bourns) | Same 170V VRWM, but 400W PPK (10/1000µs); larger SMA package (RθJA = 150°C/W vs. 125°C/W). | Higher surge rating suits infrequent high-energy events; less suitable for space-constrained PCBs. | Select when peak energy exceeds 225W and board area allows SMA footprint. |
| SMCJ170A (Littelfuse) | 170V VRWM, 1500W PPK (10/1000µs); DO-214AB package; higher VF (4.5V) and RθJA (100°C/W). | Designed for primary-level AC/DC front-end protection; over-specified for point-of-load clamping. | Choose only if system-level surge testing requires >1 kW rating and thermal mass permits larger case. |
Compared with SMAJ170A and SMCJ170A, DFLT170A-7 delivers optimal balance of compact PowerDI123 footprint, 225W capability, and 6°C/W junction-to-solder thermal path - making it preferred for dense automotive ECUs where board space and thermal coupling to ground plane are critical.
Availability
DFLT170A-7 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor interfaces, telecom DC power feeds, and motor drive control logic requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for DFLT170A-7 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
The DFLT series targets high-reliability transient suppression in automotive and industrial environments, emphasizing AEC-Q101-compliant variants, tight parametric tolerances, and thermal performance validated for under-hood and factory-floor deployment.
FAQ
What is the maximum clamping voltage of DFLT170A-7 at its rated peak pulse current?
The maximum clamping voltage (VC) is 281 V at IPP = 0.81 A using the 10/1000 µs waveform. This value is measured per JEDEC standards and guarantees that protected circuitry will not experience voltages exceeding this threshold during specified transient events.
Is DFLT170A-7 qualified to AEC-Q101 for automotive use?
The standard DFLT170A-7 is not AEC-Q101 qualified; however, the automotive-grade variant DFLT170AQ-7 is fully qualified to AEC-Q101, manufactured in IATF 16949-certified facilities, and supports PPAP documentation for Tier 1 automotive programs.
How does the PowerDI123 package improve thermal performance compared to SMA or SMB?
PowerDI123 achieves RθJS = 6°C/W due to its exposed cathode tab directly soldered to PCB copper, versus ~15°C/W for SMA packages. This enables higher surge repetition rates and eliminates need for thermal vias in many designs when using the recommended 1-inch-square 2 oz copper pad.
Can DFLT170A-7 be used in bidirectional configurations?
No - DFLT170A-7 is unidirectional. For bidirectional protection, two devices must be connected anode-to-anode (common cathode), or a dedicated bidirectional TVS such as DFLU170A-7 should be selected to handle symmetrical transients on AC or data lines.
DFLT170A-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- POWERDI®123
- 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:
- 281V
- Current - Peak Pulse (10/1000µs):
- 810mA
- Power - Peak Pulse:
- 225W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerDI™ 123
DFLT170A-7 FAQ
1.How can I place an order for DFLT170A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DFLT170A-7 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 DFLT170A-7 reliable?
The price and inventory of DFLT170A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DFLT170A-7 is usually 5 days.
3.What payment methods are accepted for DFLT170A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DFLT170A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DFLT170A-7?
DFLT170A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DFLT170A-7 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 DFLT170A-7?
For technical support, including DFLT170A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DFLT170A-7 requirements.
6.How does Aetrix verify that DFLT170A-7 is sourced from the original manufacturer or authorized distributors?
All DFLT170A-7 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 DFLT170A-7 meets industry standards.
7.What is the process for return or replacement of DFLT170A-7?
All DFLT170A-7 units undergo pre-shipment inspection (PSI). If there is an issue with DFLT170A-7, 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 DFLT170A-7 part is unused and in its original packaging.
Return procedure for DFLT170A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DFLT170A-7 Tags
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