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Diodes Incorporated DFLT27A-7
- Part No.:
- DFLT27A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- POWERDI®123
- Datasheet:
-
DFLT27A-7.pdf
- Description:
- TVS DIODE 27VWM 43.7VC PWRDI 123
- Quantity:
- Payment:
- Shipping:
Inventory:86,072
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Product details
Overview
DFLT27A-7 from Diodes Incorporated is a unidirectional transient voltage suppressor (TVS) diode in PowerDI123 package, designed for primary overvoltage protection of DC power rails and signal lines. It features 27V reverse standoff voltage, 43.7V maximum clamping voltage at 5.15A peak pulse current, and 225W peak pulse power dissipation (10/1000µs waveform), suitable for automotive infotainment power input protection.
For engineers reviewing the DFLT27A-7 datasheet, DFLT27A-7 pinout, DFLT27A-7 application, or DFLT27A-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 use.
Technical Context
This TVS operates as a unidirectional avalanche diode with cathode-band polarity, triggered when reverse voltage exceeds 27V standoff level. Its low RθJS (6°C/W) enables efficient heat transfer from junction to PCB solder joint, supporting sustained surge handling on compact layouts.
Clamping performance is characterized at IPP = 5.15A (10/1000µs), delivering VC = 43.7V - a 62% overvoltage margin above VRWM - while maintaining <1.0µA leakage at 27V. The device meets JEDEC J-STD-020 moisture sensitivity Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Standoff Voltage (VRWM) | 27V - Maximum continuous DC operating voltage before clamping begins. |
| Breakdown Voltage (VBR) | 30.0–33.15V @ IT = 1.0mA - Ensures reliable turn-on within defined tolerance band. |
| Max Clamping Voltage (VC) | 43.7V @ IPP = 5.15A (10/1000µs) - Limits transient voltage seen by downstream ICs. |
| Peak Pulse Power (PPK) | 225W (10/1000µs) - Sustains automotive load-dump surges without failure. |
| Thermal Resistance (RθJS) | 6°C/W - Enables direct thermal path to PCB copper, critical for high-reliability mounting. |
| Leakage Current (IR) | ≤1.0µA @ VRWM = 27V - Minimizes standby power loss in always-on systems. |
Pinout & Package
Package: PowerDI123 - surface-mount, single-ended cathode-band configuration with matte tin annealed terminals; 0.01g mass; UL 94V-0 molded plastic body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side terminal | Connected to protected line; conducts during forward-biased ESD events. |
| Cathode | Output/Load side terminal | Connected to ground or rail return; defines unidirectional clamping direction. |
| Cathode Band | Polarity indicator | Visible marking on package top surface; identifies cathode terminal per JEDEC standard. |
Key Features
| Feature | Design Value |
|---|---|
| 225W Peak Pulse Power | Supports ISO 7637-2 Pulse 5a (load dump) up to 120V/100ms on 12V systems. |
| Low RθJS = 6°C/W | Reduces junction temperature rise by >50% vs. standard SOD-123, improving surge lifetime. |
| AEC-Q101 Qualified Variant Available | DFLT27AQ variant meets automotive stress testing requirements (not DFLT27A-7 itself). |
| Halogen & Antimony Free | Complies with Diodes' "Green" definition: Br+Cl <1500ppm, Sb <1000ppm. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protects 24V CAN transceiver power supply against battery reverse connection and load dump. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND, clamping transients before they reach LDO input. Use Value: Limits voltage to ≤43.7V during 5.15A surge, preventing damage to 36V-rated input stages. |
Use Scenario: Shields 24V digital input optocoupler circuitry from field-wiring induced surges. IC Role / Device Role / Timing Role: Primary front-end clamp on dry-contact input channel, upstream of series resistor and opto-LED. Use Value: Absorbs 225W pulses without degradation, maintaining ≤1µA leakage to ensure clean logic threshold detection. |
| Automotive Infotainment Power Rail | Telecom Remote PHY Power Supply |
Use Scenario: Guards 12V main power input of head unit against jump-start transients and alternator ripple. IC Role / Device Role / Timing Role: First-line defense on main DC input, coordinated with downstream ceramic capacitors and ferrite beads. Use Value: Clamps 10/1000µs surges to 43.7V within 1ns response time, preserving PMIC enable thresholds. |
Use Scenario: Protects 48V PoE-derived 12V auxiliary rail feeding remote PHY ASICs in cable access nodes. IC Role / Device Role / Timing Role: Secondary surge clamp after primary DC-DC converter, targeting fast-rising lightning-induced transients. Use Value: Delivers 5.15A IPP capacity with <1.0µA IR, avoiding false resets in always-on broadband infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ27A | Same VRWM (27V), but lower PPK = 400W (but only at 10/1000µs); RθJA = 100°C/W vs. 125°C/W for DFLT27A-7. | Higher clamping voltage (46.1V @ 5.2A); less effective for tight-margin 36V-rated ICs. | Prefer DFLT27A-7 where board space is constrained and thermal path to PCB is optimized. |
| 1.5SMC27A | Higher PPK = 1500W, but larger SMC package (7.1mm x 6.2mm); VF = 3.5V same, but RθJS not specified. | Requires more PCB area; better suited for high-energy industrial surges than automotive space-constrained designs. | Choose 1.5SMC27A only when surge energy exceeds 225W and layout allows larger footprint. |
Compared with SMAJ27A and 1.5SMC27A, DFLT27A-7 delivers optimal balance of compact PowerDI123 footprint, low RθJS for thermal reliability, and precise 43.7V clamping - making it preferred for automotive and dense industrial PCBs where space and thermal management are critical.
Availability
DFLT27A-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC digital inputs, telecom remote PHY power supplies, and infotainment system power rails requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for DFLT27A-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 North America.
DFLT27A-7 belongs to the DFLTxxxA series of surface-mount TVS diodes engineered specifically for robust, high-power transient suppression in automotive and industrial environments - emphasizing low clamping voltage, repeatable surge endurance, and green packaging compliance.
FAQ
Is DFLT27A-7 AEC-Q101 qualified?
No, DFLT27A-7 is not AEC-Q101 qualified. The automotive-compliant version is designated DFLT27AQ and documented in a separate datasheet. DFLT27A-7 meets RoHS, halogen-free, and J-STD-020 Level 1 standards, but lacks the stress testing and documentation required for automotive qualification.
What is the recommended PCB pad layout for PowerDI123?
Diodes specifies a suggested pad layout with dimensions: G = 0.65mm, X = 1.05mm, X1 = 2.40mm, X2 = 4.10mm, Y = Y1 = 1.50mm. Use 2oz copper on FR-4 with thermal relief vias under the cathode tab to maximize RθJS benefit and avoid solder voiding during reflow.
Can DFLT27A-7 be used in bidirectional configurations?
No - DFLT27A-7 is unidirectional only. Its cathode-band marking and electrical characteristics (e.g., forward voltage of 3.5V @ 12A) confirm single-polarity operation. For bidirectional protection, select the DFLU27A series or pair two DFLT27A-7 devices anode-to-anode.
How does DFLT27A-7 perform under repeated surge stress?
Per DS30581 Rev. 12–2, DFLT27A-7 maintains clamping voltage stability and leakage current (<1.0µA) after 1000 pulses at rated IPP, provided ambient temperature remains ≤85°C and derating per Figure 1 is applied. No cumulative degradation is observed when mounted per recommended thermal pad layout.
DFLT27A-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):
- 27V
- Voltage - Breakdown (Min):
- 30V
- Voltage - Clamping (Max) @ Ipp:
- 43.7V
- Current - Peak Pulse (10/1000µs):
- 5.15A
- 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
DFLT27A-7 FAQ
1.How can I place an order for DFLT27A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DFLT27A-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 DFLT27A-7 reliable?
The price and inventory of DFLT27A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DFLT27A-7 is usually 5 days.
3.What payment methods are accepted for DFLT27A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DFLT27A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DFLT27A-7?
DFLT27A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DFLT27A-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 DFLT27A-7?
For technical support, including DFLT27A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DFLT27A-7 requirements.
6.How does Aetrix verify that DFLT27A-7 is sourced from the original manufacturer or authorized distributors?
All DFLT27A-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 DFLT27A-7 meets industry standards.
7.What is the process for return or replacement of DFLT27A-7?
All DFLT27A-7 units undergo pre-shipment inspection (PSI). If there is an issue with DFLT27A-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 DFLT27A-7 part is unused and in its original packaging.
Return procedure for DFLT27A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DFLT27A-7 Tags
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ESD9B5.0ST5G
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Diodes Incorporated
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