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Diodes Incorporated DFLZ30Q-7
- Part No.:
- DFLZ30Q-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- POWERDI®123
- Datasheet:
-
DFLZ30Q-7.pdf
- Description:
- DIODE ZENER 30V 1W POWERDI 123
- Quantity:
- Payment:
- Shipping:
Inventory:7,124
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Product details
Overview
DFLZ30Q-7 from Diodes Incorporated is a 1.0 W surface-mount power Zener diode in PowerDI123 package, with nominal Zener voltage 30 V (min 28 V, max 32 V), Zener impedance 8 Ω at 25 mA test current, and maximum reverse leakage current 1 µA at 22 V. It delivers stable voltage regulation in automotive power supply rails and industrial overvoltage protection circuits.
For engineers reviewing the DFLZ30Q-7 datasheet, DFLZ30Q-7 pinout, DFLZ30Q-7 application, or DFLZ30Q-7 equivalent, key selection criteria include its AEC-Q101 qualification, 110 °C/W thermal resistance (junction-to-ambient), -55 °C to +150 °C operating temperature range, and 9 °C/W junction-to-solder-point thermal resistance for high-reliability thermal design.
Technical Context
This Zener diode operates in reverse breakdown mode to clamp transient overvoltages and regulate reference voltages. Its patented interlocking clip design enables high-surge capacity per US Patent #7,095,113, and the exposed cathode pad supports direct PCB heat sinking.
Rated for 1.0 W dissipation on FR-4 with 2 oz. copper and 1" × 1" pad, it maintains regulation across -55 °C to +150 °C with a temperature coefficient of +0.06 %/°C to +0.11 %/°C - indicating positive drift over temperature, critical for precision biasing stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 30 V nominal, 28–32 V range at IZT = 25 mA - defines clamping threshold under standard test conditions |
| Power Dissipation (PD) | 1.0 W on FR-4 PCB - sets maximum continuous steady-state power handling with defined layout |
| Zener Impedance (ZZT) | 8 Ω typical at IZT = 25 mA - determines regulation stiffness and AC ripple rejection capability |
| Reverse Leakage (IR) | ≤1 µA at VR = 22 V - ensures minimal standby current in high-impedance bias networks |
| Thermal Resistance (RθJA) | 110 °C/W - quantifies temperature rise above ambient per watt dissipated on standard board |
| Operating Temperature | -55 °C to +150 °C - validated for under-hood automotive and industrial control environments |
| AEC-Q101 Qualified | Yes - confirms reliability for automotive electronics per stress-test requirements |
Pinout & Package
Package: PowerDI123 - molded plastic case with large exposed cathode pad for thermal conduction; UL 94V-0 rated; moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse breakdown reference | Connected to lower-potential node during regulation; forms cathode-referenced clamp |
| Cathode | Reverse breakdown output / Heat sink interface | Marked with band; soldered directly to PCB copper pour for thermal management |
Key Features
| Feature | Design Value |
|---|---|
| Patented interlocking clip structure | Enables high surge current tolerance (e.g., 8/20 µs transients) without bond wire failure |
| Exposed cathode thermal pad | Reduces RθJS to 9 °C/W - improves thermal coupling to PCB heatsinking |
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTOL, TC, HAST, and ESD testing |
| Halogen- and antimony-free "Green" compound | Meets <900 ppm Br, <900 ppm Cl (<1500 ppm total Br+Cl), <1000 ppm Sb - compliant with global environmental mandates |
| Lead-free matte tin finish | Solderable per MIL-STD-202, Method 208 - ensures robust reflow and wave solder joint integrity |
Applications
| Automotive Engine Control Unit (ECU) Power Rail Clamp | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Suppresses load-dump transients up to 40 V on 12 V battery-supplied microcontroller power rails. IC Role / Device Role / Timing Role: Zener clamping device placed between VCC and ground, conducting only during overvoltage events. Use Value: Limits rail excursion to ≤32 V, protecting 3.3 V/5 V logic supplies downstream via series current-limiting resistor. | Use Scenario: Guards 0–10 V analog input channels against field-wiring faults and ESD events. IC Role / Device Role / Timing Role: Reverse-biased shunt regulator connected across input and ground, absorbing fault energy. Use Value: Maintains input node below 32 V during 1 kV ESD contact discharge, preventing op-amp saturation and ADC damage. |
| Telecom DC-DC Converter Reference Stabilization | Medical Infusion Pump Motor Driver Overvoltage Suppression |
Use Scenario: Provides stable 30 V reference for feedback loop in isolated flyback converter secondary-side regulation. IC Role / Device Role / Timing Role: Precision Zener used as voltage reference in optocoupler feedback network. Use Value: Delivers ±3.3% voltage tolerance and low 8 Ω dynamic impedance for tight output regulation (±1%) across line/load. | Use Scenario: Clamps inductive kickback from brushed DC motor driver H-bridge during rapid deceleration. IC Role / Device Role / Timing Role: Bidirectional transient suppressor (with series diode) limiting back-EMF spikes to safe levels. Use Value: Absorbs 1.0 W surges for >100 ms without degradation, meeting IEC 60601-1 creepage/safety isolation requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C30LT1G | 0.3 W rating, SOT-23 package, RθJA = 300 °C/W, ZZT = 40 Ω at 5 mA | Lower power, higher impedance - suitable only for signal-level biasing, not power rail clamping | Select when space-constrained and dissipation <300 mW; avoid for automotive load-dump scenarios. |
| 1N4745A | 1.0 W DO-41 through-hole, RθJA ≈ 50 °C/W (with heatsink), ZZT = 15 Ω at 21 mA | Through-hole mounting limits PCB density; requires manual assembly or wave soldering | Choose for legacy designs or where thermal mass from axial leads improves surge endurance. |
Compared with BZX84-C30LT1G and 1N4745A, DFLZ30Q-7 uniquely combines AEC-Q101 qualification, surface-mount PowerDI123 thermal performance (RθJS = 9 °C/W), and 30 V regulation in a production-ready automotive package - making it optimal for high-volume, thermally demanding, and safety-critical applications.
Availability
DFLZ30Q-7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, telecom DC-DC converters, and medical infusion pump systems requiring stable component supply across extended temperature and lifecycle demands.
Supply support for DFLZ30Q-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.
The DFLZ series belongs to Diodes' AEC-Q101-qualified Power Zener portfolio, engineered specifically for robust voltage regulation and transient suppression in harsh-environment automotive and industrial power systems.
FAQ
What is the maximum surge current DFLZ30Q-7 can withstand?
DFLZ30Q-7 is designed with a patented interlocking clip structure (US Patent #7,095,113) enabling high-surge capacity. While no single peak current value is specified, its 1.0 W power rating, low RθJS (9 °C/W), and AEC-Q101 qualification indicate suitability for automotive load-dump transients (ISO 7637-2 Pulse 5a/b) when used with appropriate series impedance.
Is DFLZ30Q-7 compatible with lead-free reflow profiles?
Yes. DFLZ30Q-7 features a matte tin annealed finish over copper leadframe, qualified for lead-free soldering per MIL-STD-202, Method 208. Its PowerDI123 package supports JEDEC J-STD-020 Level 1 moisture sensitivity, allowing standard Pb-free reflow without pre-bake.
How does the temperature coefficient affect regulation accuracy over temperature?
DFLZ30Q-7 has a temperature coefficient of +0.06 %/°C to +0.11 %/°C. Over a -40 °C to +125 °C range, this results in a total Zener voltage shift of approximately ±1.98 V - meaning regulation stays within 28.0 V to 31.98 V. This is acceptable for non-precision clamping but requires compensation in reference applications.
Can DFLZ30Q-7 be used in parallel for higher power handling?
No. Zener diodes exhibit negative temperature coefficients at low voltages but positive ones above ~5.6 V - DFLZ30Q-7's +0.06–0.11 %/°C coefficient causes current hogging if paralleled. Uneven thermal coupling in PowerDI123 packages further exacerbates imbalance. Use a single appropriately rated device or consider active regulation instead.
DFLZ30Q-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):
- 30 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 8 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 22 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
DFLZ30Q-7 FAQ
1.How can I place an order for DFLZ30Q-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DFLZ30Q-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 DFLZ30Q-7 reliable?
The price and inventory of DFLZ30Q-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DFLZ30Q-7 is usually 5 days.
3.What payment methods are accepted for DFLZ30Q-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DFLZ30Q-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DFLZ30Q-7?
DFLZ30Q-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DFLZ30Q-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 DFLZ30Q-7?
For technical support, including DFLZ30Q-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DFLZ30Q-7 requirements.
6.How does Aetrix verify that DFLZ30Q-7 is sourced from the original manufacturer or authorized distributors?
All DFLZ30Q-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 DFLZ30Q-7 meets industry standards.
7.What is the process for return or replacement of DFLZ30Q-7?
All DFLZ30Q-7 units undergo pre-shipment inspection (PSI). If there is an issue with DFLZ30Q-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 DFLZ30Q-7 part is unused and in its original packaging.
Return procedure for DFLZ30Q-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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