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Diodes Incorporated DFLT51A-7
- Part No.:
- DFLT51A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- POWERDI®123
- Datasheet:
-
DFLT51A-7.pdf
- Description:
- TVS DIODE 51VWM 82.4VC PWRDI 123
- Quantity:
- Payment:
- Shipping:
Inventory:7,989
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Product details
Overview
DFLT51A-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 51 V reverse standoff voltage, 82.4 V max clamping voltage at 2.73 A peak pulse current, and 225 W peak pulse power dissipation (10/1000 µs waveform), deployed in automotive infotainment power supply inputs.
For engineers reviewing the DFLT51A-7 datasheet, DFLT51A-7 pinout, DFLT51A-7 application, or DFLT51A-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.
Technical Context
This TVS operates in avalanche breakdown mode during transients, with a tightly controlled 56.7–62.7 V breakdown voltage range at 1.0 mA test current. Its low RθJS of 6 °C/W enables effective heat transfer from junction to PCB cathode pad, supporting sustained surge handling on compact layouts.
The device exhibits <1.0 µA reverse leakage at 51 V standoff and delivers 82.4 V clamping at 2.73 A (10/1000 µs), achieving a clamping ratio of 1.62 - critical for protecting 48 V automotive electronics without over-clamping into functional interruption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Standoff Voltage (VRWM) | 51 V - maximum continuous DC operating voltage before leakage exceeds 1.0 µA |
| Breakdown Voltage (VBR) | 56.7–62.7 V @ 1.0 mA - defines onset of avalanche conduction during overvoltage events |
| Max Clamping Voltage (VC) | 82.4 V @ IPP = 2.73 A (10/1000 µs) - upper voltage limit imposed on protected circuit during surge |
| Peak Pulse Power (PPK) | 225 W - surge energy handling capacity per single non-repetitive transient event |
| Thermal Resistance (RθJS) | 6 °C/W - junction-to-solder-joint thermal path efficiency, enabling high-power dissipation on minimal copper area |
| Package | PowerDI123 - surface-mount, single-cathode-band, 3-pin-compatible footprint with 0.01 g mass and UL 94V-0 rating |
Pinout & Package
Package: PowerDI123 - molded green plastic housing, cathode band marking, matte tin-plated copper leadframe, moisture sensitivity level 1 (J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to ground or low-impedance reference plane; carries full surge current during clamping |
| Cathode | Protected line connection | Connected to line being protected (e.g., 48 V rail); voltage referenced to anode during clamping |
| Cathode Tab (exposed pad) | Thermal and electrical ground interface | Soldered directly to PCB copper pour for low-inductance grounding and thermal conduction (RθJS = 6 °C/W) |
Key Features
| Feature | Design Value |
|---|---|
| 225 W peak pulse power (10/1000 µs) | Supports robust protection against ISO 7637-2 Pulse 5a (load dump) in 48 V systems without derating |
| Clamping ratio ≤1.62 (VC/VBR) | Ensures protected ICs with 85 V absolute maximum rating remain within safe operating margin |
| RθJS = 6 °C/W | Enables >90% of surge energy to dissipate into PCB copper, reducing localized heating in high-density layouts |
| AEC-Q101 qualified variant available (DFLT51AQ) | Meets automotive stress testing requirements including temperature cycling, HTRB, and ESD (HBM ≥8 kV) |
Applications
| Automotive 48 V Power Distribution | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 48 V battery-fed ECUs against load dump transients up to 60 V nominal with ISO 7637-2 Pulse 5a compliance. IC Role / Device Role / Timing Role: Primary unidirectional TVS clamp placed upstream of DC-DC converter input stage. Use Value: Limits transient voltage to 82.4 V at 2.73 A, preserving converter IC integrity while surviving 225 W surges without degradation. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers exposed to inductive switching noise. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp on field-side signal entry point, before optocoupler isolation barrier. Use Value: Sub-100 ns response time and 1.0 µA leakage at 24 V ensure signal fidelity and low standby power in always-on monitoring circuits. |
| Telecom PoE++ Midspan Protection | Medical Imaging Power Rail Clamp |
Use Scenario: Secondary surge suppression on 57 V PoE++ (IEEE 802.3bt Type 4) midspan injectors feeding remote equipment. IC Role / Device Role / Timing Role: Back-to-back TVS configuration with complementary polarity device to handle bidirectional surges on data+power lines. Use Value: 51 V standoff aligns with PoE++ under-voltage lockout thresholds; 82.4 V clamping avoids false shutdown during transient events. |
Use Scenario: Protecting high-precision analog front-end power supplies in MRI gradient amplifier modules from ESD and switching noise. IC Role / Device Role / Timing Role: Localized TVS on ±15 V and +5 V analog rails adjacent to ADC/DAC converters. Use Value: Low capacitance (<50 pF at 0 V, <15 pF at 51 V) prevents signal distortion in multi-MHz sampling paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51A (onsemi) | Same 51 V VRWM, but 400 W PPK, SMA package, RθJA = 150 °C/W (no exposed tab) | Larger footprint, higher thermal resistance limits sustained surge duty cycle in dense layouts | Select when higher peak power is required and board space allows SMA; avoid where RθJS < 10 °C/W is needed |
| DFLT51AQ (Diodes) | Identical electrical specs, AEC-Q101 qualified, PPAP-capable, manufactured in IATF 16949 facility | Mandatory for automotive production; requires change control documentation and lot traceability | Choose for Tier 1 automotive programs; DFLT51A-7 is suitable for industrial/medical prototyping and non-automotive volume production |
Compared with SMAJ51A, DFLT51A-7 offers superior thermal performance via its exposed cathode tab, enabling higher reliability in thermally constrained designs; compared with DFLT51AQ, it provides identical protection performance without automotive qualification overhead, reducing cost and lead time for non-automotive use cases.
Availability
DFLT51A-7 is available at Aetrix Electronics and suitable for automotive infotainment power distribution, industrial PLC digital input protection, and telecom PoE++ midspan protection requiring stable component supply and consistent parametric performance across production lots.
Supply support for DFLT51A-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.
This device belongs to Diodes' PowerDI® TVS portfolio, engineered specifically for high-reliability transient suppression in automotive, industrial, and communications infrastructure where low clamping ratio and thermal efficiency are critical.
FAQ
What is the maximum operating temperature for DFLT51A-7?
The DFLT51A-7 has an operating junction temperature range of –65 °C to +150 °C. Its thermal resistance from junction to solder point (RθJS) is 6 °C/W, meaning a 225 W surge would raise junction temperature by only 1.35 °C above solder point if fully conducted - making it suitable for high-ambient environments like engine bay proximity or enclosed industrial enclosures.
Is DFLT51A-7 RoHS and halogen-free compliant?
Yes. DFLT51A-7 uses a halogen- and antimony-free "Green" molding compound with <900 ppm bromine, <900 ppm chlorine (total Br + Cl <1500 ppm), and <1000 ppm antimony. It meets EU RoHS 2015/863/EU and is lead-free with matte tin annealed finish, solderable per MIL-STD-202, Method 208.
How does DFLT51A-7 differ from DFLT51AQ?
DFLT51A-7 and DFLT51AQ share identical electrical specifications and PowerDI123 packaging, but DFLT51AQ undergoes AEC-Q101 stress testing (including HTGB, TCT, and H3TRB), is PPAP-capable, and is produced in IATF 16949-certified facilities. DFLT51A-7 is intended for industrial, medical, and telecom applications where automotive qualification is not required.
Can DFLT51A-7 be used in bidirectional configurations?
No. DFLT51A-7 is a unidirectional TVS diode with cathode-band polarity. For bidirectional protection, two devices must be connected in series opposing configuration, or a dedicated bidirectional part such as DFLU51A should be selected - which features symmetrical breakdown in both directions and identical 51 V standoff rating.
DFLT51A-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):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 2.73A
- 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
DFLT51A-7 FAQ
1.How can I place an order for DFLT51A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DFLT51A-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 DFLT51A-7 reliable?
The price and inventory of DFLT51A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DFLT51A-7 is usually 5 days.
3.What payment methods are accepted for DFLT51A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DFLT51A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DFLT51A-7?
DFLT51A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DFLT51A-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 DFLT51A-7?
For technical support, including DFLT51A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DFLT51A-7 requirements.
6.How does Aetrix verify that DFLT51A-7 is sourced from the original manufacturer or authorized distributors?
All DFLT51A-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 DFLT51A-7 meets industry standards.
7.What is the process for return or replacement of DFLT51A-7?
All DFLT51A-7 units undergo pre-shipment inspection (PSI). If there is an issue with DFLT51A-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 DFLT51A-7 part is unused and in its original packaging.
Return procedure for DFLT51A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DFLT51A-7 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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