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Diodes Incorporated DFLZ20Q-7
- Part No.:
- DFLZ20Q-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- POWERDI®123
- Datasheet:
-
DFLZ20Q-7.pdf
- Description:
- DIODE ZENER 20V 1W POWERDI 123
- Quantity:
- Payment:
- Shipping:
Inventory:2,185
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Product details
Overview
DFLZ20Q-7 from Diodes Incorporated is a 1.0W surface-mount power Zener diode in PowerDI123 package, rated for 20V nominal Zener voltage (18.8–21.2V range), 25Ω max Zener impedance at 100mA test current, and −55°C to +150°C operating temperature. It delivers stable voltage regulation in automotive power supply rails and industrial overvoltage protection circuits.
For engineers reviewing the DFLZ20Q-7 datasheet, DFLZ20Q-7 pinout, DFLZ20Q-7 application, or DFLZ20Q-7 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (9°C/W junction-to-solder point), AEC-Q101 qualification, surge robustness via patented interlocking clip design, and RoHS/halogen-free compliance.
Technical Context
This Zener diode operates in reverse-bias breakdown mode to clamp transient overvoltages and regulate reference voltages. Its 1.0W power dissipation is validated on FR-4 PCB with 1"×1" copper pad, and thermal performance relies on the exposed cathode tab acting as both terminal and heatsink.
The device uses a patented interlocking clip structure (US Patent #7,095,113) to withstand high-energy surges, and its Zener impedance of ≤25Ω at IZT = 100mA ensures low dynamic deviation under load variation-critical for precision biasing and feedback sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20V nominal, 18.8–21.2V min/max at IZT = 100mA - defines clamping threshold for overvoltage protection |
| Power Dissipation (PD) | 1.0W on FR-4 PCB - sets maximum continuous energy handling under thermal derating curve |
| Zener Impedance (ZZT) | ≤25Ω max at IZT = 100mA - determines regulation stiffness against current transients |
| Thermal Resistance (RθJS) | 9°C/W junction-to-solder point - enables direct thermal path to PCB copper for sustained 1W operation |
| Operating Temperature | −55°C to +150°C - supports under-hood automotive and industrial environments without derating |
| Reverse Leakage (IR) | ≤1µA at VR = 15V - ensures minimal quiescent current in high-impedance bias networks |
| Temperature Coefficient | +0.06%/°C max - quantifies VZ drift across temperature, critical for stable references |
Pinout & Package
Package: PowerDI123 - surface-mount plastic case with large exposed cathode pad for thermal and electrical conduction; UL 94V-0 rated, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse breakdown reference node | Connected to lower-potential rail; forms regulated output when cathode is biased above anode |
| Cathode (Exposed Pad) | Reverse current sink / Thermal interface | Serves as primary heat path to PCB; must be soldered to ≥1"×1" copper area for full 1W rating |
Key Features
| Feature | Design Value |
|---|---|
| Patented interlocking clip structure | Enables high-surge capability per US Patent #7,095,113-critical for load-dump and ISO 7637-2 pulse immunity |
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics requiring reliability certification |
| Halogen- and antimony-free "Green" compound | Meets <900ppm Br, <900ppm Cl, <1000ppm Sb - satisfies strict environmental compliance for Tier-1 automotive supply chains |
| Lead-free matte tin finish | Solderable per MIL-STD-202, Method 208 - ensures robust reflow joint integrity in automated assembly |
Applications
| Automotive Power Rail Protection | Industrial Sensor Reference Supply |
|---|---|
Use Scenario: Protects 12V/24V vehicle subsystems (e.g., infotainment, lighting modules) from load-dump transients up to ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Zener clamping element placed between battery rail and downstream regulator input. Use Value: Absorbs 1W surge energy while holding voltage ≤21.2V, preventing damage to LDOs and microcontrollers. | Use Scenario: Provides stable 20V reference for analog front-ends in factory automation pressure/temperature transmitters. IC Role / Device Role / Timing Role: Precision shunt reference in two-terminal configuration with series resistor. Use Value: Delivers ±1.2V tolerance and <25Ω dynamic impedance, enabling 0.5% reference accuracy over −40°C to +125°C. |
| DC-DC Converter Feedback Clamp | Overvoltage Detection in Battery Management |
Use Scenario: Limits feedback node voltage in isolated flyback converters to prevent optocoupler saturation during output overvoltage faults. IC Role / Device Role / Timing Role: Shunt limiter across TL431 reference divider network. Use Value: Fast response (<10ns) and low ZZT ensure immediate clamping before secondary-side controller reacts. | Use Scenario: Monitors cell stack voltage in 48V mild-hybrid BMS; triggers disconnect when >21.2V detected. IC Role / Device Role / Timing Role: Primary overvoltage comparator element with hysteresis set by external resistor divider. Use Value: AEC-Q101 qualification and 150°C rating allow placement near battery cells without thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C20LT1G | 0.3W rating, SOT-23 package, RθJA = 300°C/W - lower power, higher thermal resistance | Not suitable for sustained 1W clamping; limited to signal-level protection | Select only for low-power biasing where board space is constrained and surge immunity is not required |
| MMSZ5248B-TP | 0.5W rating, SOD-123 package, ZZT = 30Ω max - reduced power and higher impedance than DFLZ20Q-7 | Lacks AEC-Q101 qualification and interlocking clip surge design | Acceptable for non-automotive industrial references but not for load-dump or PPAP-critical designs |
Compared with BZX84-C20LT1G and MMSZ5248B-TP, DFLZ20Q-7 uniquely combines 1W dissipation, 9°C/W thermal resistance, AEC-Q101 qualification, and patented surge structure-making it the only choice for automotive-grade, high-reliability Zener clamping where thermal and transient performance are co-constrained.
Availability
DFLZ20Q-7 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor reference supplies, DC-DC converter feedback clamping, and battery management overvoltage detection requiring stable component supply across production lifecycles.
Supply support for DFLZ20Q-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, specializing in high-reliability components for automotive, industrial, and computing markets.
The DFLZ series targets automotive and industrial Zener regulation needs, emphasizing AEC-Q101 qualification, superior thermal performance via exposed-pad packaging, and robust surge survivability for harsh-environment applications.
FAQ
What is the maximum peak pulse power this Zener can handle?
The DFLZ20Q-7 is not rated for single-pulse peak power in datasheet specifications. Its surge capability derives from the patented interlocking clip structure (US Patent #7,095,113), enabling robust handling of repetitive transients like ISO 7637-2 Pulse 5a. For pulsed applications, thermal mass and PCB layout dominate performance-not a fixed peak wattage value.
Can this part replace a through-hole 1N4744A in a new design?
Yes, DFLZ20Q-7 provides equivalent 20V Zener functionality but in surface-mount PowerDI123 format. It offers superior thermal performance (RθJS = 9°C/W vs. ~50°C/W for 1N4744A on PCB) and AEC-Q101 qualification-however, mechanical mounting and solder profile must be adapted for SMT assembly instead of axial lead insertion.
Is the cathode pad electrically isolated from the anode terminal?
No-the exposed cathode pad is the cathode terminal itself, directly connected to the semiconductor die's cathode region. It is not insulated; proper PCB layout must ensure no unintended shorting to adjacent traces or planes, and the pad must be connected exclusively to the intended cathode net.
Does the "-7" suffix affect electrical characteristics?
No-the "-7" suffix denotes tape-and-reel packaging (3000 units per reel) and automotive qualification per ordering convention. All electrical, thermal, and reliability specifications-including Zener voltage, power rating, and AEC-Q101 compliance-are identical to the base DFLZ20Q part number.
DFLZ20Q-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- POWERDI®123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 20 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 3 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 15 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerDI™ 123
DFLZ20Q-7 FAQ
1.How can I place an order for DFLZ20Q-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DFLZ20Q-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 DFLZ20Q-7 reliable?
The price and inventory of DFLZ20Q-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DFLZ20Q-7 is usually 5 days.
3.What payment methods are accepted for DFLZ20Q-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DFLZ20Q-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DFLZ20Q-7?
DFLZ20Q-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DFLZ20Q-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 DFLZ20Q-7?
For technical support, including DFLZ20Q-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DFLZ20Q-7 requirements.
6.How does Aetrix verify that DFLZ20Q-7 is sourced from the original manufacturer or authorized distributors?
All DFLZ20Q-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 DFLZ20Q-7 meets industry standards.
7.What is the process for return or replacement of DFLZ20Q-7?
All DFLZ20Q-7 units undergo pre-shipment inspection (PSI). If there is an issue with DFLZ20Q-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 DFLZ20Q-7 part is unused and in its original packaging.
Return procedure for DFLZ20Q-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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