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Diodes Incorporated DFLT48A-7
- Part No.:
- DFLT48A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- POWERDI®123
- Datasheet:
-
DFLT48A-7.pdf
- Description:
- TVS DIODE 48VWM 77.4VC PWRDI 123
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
DFLT48A-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 48 V reverse standoff voltage, 53.3 V minimum breakdown voltage, 77.4 V maximum clamping voltage at 2.91 A peak pulse current, and 225 W peak pulse power dissipation (10/1000 µs waveform). Used in automotive infotainment power inputs and industrial sensor interface protection.
For engineers reviewing the DFLT48A-7 datasheet, DFLT48A-7 pinout, DFLT48A-7 application, or DFLT48A-7 equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, 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 operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds VRWM = 48 V and fully clamping at VC = 77.4 V under 2.91 A (10/1000 µs). Its low RθJS = 6 °C/W enables effective heat transfer from junction to PCB cathode pad, supporting sustained surge handling on FR-4 with 1-inch² 2 oz copper.
It exhibits <1.0 µA reverse leakage at VRWM, 3.5 V forward voltage at 12 A, and total capacitance <70 pF at 0 V (f = 1 MHz), making it suitable for <10 Mbps data line protection without signal integrity degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Standoff Voltage (VRWM) | 48 V - Maximum continuous DC operating voltage before significant leakage begins. |
| Breakdown Voltage (VBR) | 53.3–58.9 V @ 1.0 mA - Confirmed avalanche initiation range ensuring predictable turn-on behavior. |
| Clamping Voltage (VC) | 77.4 V @ IPP = 2.91 A (10/1000 µs) - Limits downstream voltage during surge to safe levels for 5V–48V systems. |
| Peak Pulse Power (PPK) | 225 W - Sustains single transient events per JEDEC JESD22-A114F standard without failure. |
| Thermal Resistance (RθJS) | 6 °C/W - Enables efficient heat conduction from die to solder joint, critical for board-level reliability under repeated surges. |
| Capacitance (CT) | <70 pF @ 0 V, 1 MHz - Low enough to avoid signal distortion on CAN, LIN, or RS-485 interfaces. |
Pinout & Package
Package: PowerDI123 - Surface-mount, single-cathode-band marking, molded green plastic (UL 94V-0), 0.01 g weight, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side terminal | Connected to protected line; conducts during forward surge or ESD event in bidirectional mode (not applicable here-unidirectional). |
| Cathode | Ground/reference terminal | Connected to system ground plane; forms low-impedance path for transient current; serves as primary thermal conduction path to PCB. |
Key Features
| Feature | Design Value |
|---|---|
| 225 W peak pulse rating (10/1000 µs) | Meets ISO 7637-2 Pulse 5a requirements for 12 V automotive systems up to 2.91 A surge current. |
| Low clamping ratio (VC/VRWM = 1.61) | Minimizes overvoltage stress on downstream 48 V-rated components such as PMICs or gate drivers. |
| RθJS = 6 °C/W | Enables >80% of surge energy to dissipate into PCB copper, reducing junction temperature rise by ~17 °C vs. typical SOD-123. |
| Lead-free, halogen-free, RoHS 3 compliant | Supports automotive PPAP documentation and IATF 16949 manufacturing traceability. |
Applications
| Automotive Body Control Module (BCM) Power Input | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Protects 48 V supply rail feeding microcontroller and CAN transceiver against load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamps reverse-polarity and surge events on main power input before they reach LDOs and MCU VDD. Use Value: Clamps to 77.4 V within 1 ns, limiting stress on 80 V-rated input capacitors and preventing brownout-induced MCU reset. |
Use Scenario: Shields 4–20 mA current loop receiver circuitry from induced surges on field wiring in factory automation environments. IC Role / Device Role / Timing Role: Fast-response avalanche diode shunts transient energy away from precision op-amp input stage and ADC front-end. Use Value: Sub-70 pF capacitance avoids gain error and phase shift in 1 kHz bandwidth analog channels while sustaining 225 W pulses. |
| Telecom Remote Radio Unit (RRU) Bias Supply | EV Onboard Charger (OBC) Auxiliary Power Rail |
Use Scenario: Guards +48 V bias supply feeding RF power amplifiers against lightning-induced surges on outdoor coaxial feed lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed immediately after DC-DC converter output filter, upstream of GaN FET gate drivers. Use Value: 2.91 A IPP capacity handles 10/1000 µs surges exceeding IEC 61000-4-5 Level 4 (4 kV), preserving amplifier uptime. |
Use Scenario: Protects isolated 48 V auxiliary supply powering OBC control logic and communication interfaces during high-voltage battery transients. IC Role / Device Role / Timing Role: Secondary surge suppression stage after primary MOV, providing precise clamping for sensitive digital isolators and USB-C PD controllers. Use Value: Tight VBR tolerance (±5.5%) ensures consistent turn-on across temperature, avoiding false triggering during battery regen spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48A | Same VRWM (48 V), but higher VC = 77.4 V → 77.4 V (identical), lower PPK = 400 W (but larger SMA package), RθJA = 50 °C/W vs. 125 °C/W. | Requires larger PCB area; less effective thermal coupling; not qualified to AEC-Q101. | Select if higher peak power margin is needed and space allows; avoid for automotive due to qualification gap. |
| DFLT48AQ-7 | AEC-Q101 qualified version with identical electrical specs; same PowerDI123 package; certified for PPAP and manufactured in IATF 16949 facility. | Required for production automotive ECUs; supports change control and long-term supply continuity. | Choose for Tier 1 automotive programs where qualification documentation and process traceability are mandatory. |
Compared with SMAJ48A, DFLT48A-7 offers superior thermal performance and smaller footprint, while DFLT48AQ-7 adds automotive-grade compliance without sacrificing electrical behavior-making it the preferred choice for safety-critical 48 V systems.
Availability
DFLT48A-7 is available at Aetrix Electronics and suitable for automotive body electronics, industrial analog I/O modules, telecom remote radio units, and EV onboard charger auxiliary supplies requiring stable component supply and rapid fulfillment.
Supply support for DFLT48A-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design, manufacturing, and sales operations across Asia, the Americas, and Europe.
DFLT48A-7 belongs to the PowerDI® TVS family engineered for high-reliability transient suppression in automotive, industrial, and telecom infrastructure-emphasizing low clamping, tight parametric tolerances, and robust thermal performance in compact surface-mount packages.
FAQ
What is the AEC-Q qualification status of DFLT48A-7?
DFLT48A-7 is not AEC-Q101 qualified. It is a commercial-grade variant. For automotive applications requiring AEC-Q101 certification, Diodes offers the functionally identical DFLT48AQ-7, which undergoes full stress testing per AEC-Q101 Rev G and is produced in IATF 16949-certified facilities with PPAP support.
Can DFLT48A-7 be used in bidirectional configurations?
No. DFLT48A-7 is a unidirectional TVS diode, optimized for clamping only in reverse-biased mode. Its anode must connect to the protected line and cathode to ground. For bidirectional protection (e.g., AC lines or data buses), two DFLT48A-7 devices in series opposition or a dedicated bidirectional part like DFL055B-7 is required.
What is the recommended PCB layout for optimal thermal performance?
Use a minimum 1-inch² (25 mm²) 2 oz copper pad connected directly to the cathode terminal, with ≥4 thermal vias (0.3 mm diameter, filled or plated) spaced evenly beneath the pad and routed to inner-layer ground planes. Avoid solder mask over the pad to maximize thermal conduction and minimize RθJA to ≤125 °C/W.
How does DFLT48A-7 perform under repetitive surge conditions?
DFLT48A-7 is rated for non-repetitive pulses per JEDEC JESD22-A114F. Derating is required for repetitive events: at 25°C ambient, peak pulse power drops to 50% at 1 Hz and 25% at 10 Hz (per Figure 1 derating curve). For frequent surges, thermal modeling using RθJS = 6 °C/W and junction temperature limits (TJ ≤ 150°C) is essential.
DFLT48A-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):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 2.91A
- 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
DFLT48A-7 FAQ
1.How can I place an order for DFLT48A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DFLT48A-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 DFLT48A-7 reliable?
The price and inventory of DFLT48A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DFLT48A-7 is usually 5 days.
3.What payment methods are accepted for DFLT48A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DFLT48A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DFLT48A-7?
DFLT48A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DFLT48A-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 DFLT48A-7?
For technical support, including DFLT48A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DFLT48A-7 requirements.
6.How does Aetrix verify that DFLT48A-7 is sourced from the original manufacturer or authorized distributors?
All DFLT48A-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 DFLT48A-7 meets industry standards.
7.What is the process for return or replacement of DFLT48A-7?
All DFLT48A-7 units undergo pre-shipment inspection (PSI). If there is an issue with DFLT48A-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 DFLT48A-7 part is unused and in its original packaging.
Return procedure for DFLT48A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DFLT48A-7 Tags
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Diodes Incorporated
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