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Diodes Incorporated DFLZ33Q-7
- Part No.:
- DFLZ33Q-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- POWERDI®123
- Datasheet:
-
DFLZ33Q-7.pdf
- Description:
- DIODE ZENER 33V 1W POWERDI 123
- Quantity:
- Payment:
- Shipping:
Inventory:8,813
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Product details
Overview
DFLZ33Q-7 from Diodes Incorporated is a 1.0W surface-mount power Zener diode in PowerDI123 package, rated for 33V nominal Zener voltage (31–35V range), 24µA maximum reverse leakage at 24V, and 5Ω typical Zener impedance at 1mA test current. It delivers stable voltage regulation in automotive power supply rails, ECU overvoltage clamping, and industrial sensor interface protection.
For engineers reviewing the DFLZ33Q-7 datasheet, DFLZ33Q-7 pinout, DFLZ33Q-7 application, or DFLZ33Q-7 equivalent, key selection criteria include AEC-Q101 qualification, thermal resistance of 9°C/W (junction-to-solder point), 110°C/W junction-to-ambient rating on FR-4, -55°C to +150°C operating range, and RoHS-compliant green packaging with matte tin finish.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain precise DC voltage reference or transient suppression. Its patented interlocking clip design enables high-surge capacity per US Patent #7,095,113, and the exposed cathode pad enhances thermal dissipation under sustained 1W load.
Rated for automotive-grade reliability, it meets AEC-Q101 stress tests including temperature cycling, HTRB, and surge current (8.3ms half-sine). The device exhibits a positive temperature coefficient (+0.06%/°C) above 20V, enabling predictable drift behavior in wide-temperature environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V nominal, 31–35 V min/max range at IZT = 1 mA - defines clamping threshold in overvoltage protection circuits |
| Power Dissipation (PD) | 1.0 W on FR-4 PCB with 1"×1" copper pad - supports continuous regulation in space-constrained automotive modules |
| Zener Impedance (ZZT) | 5 Ω typical at IZT = 1 mA - ensures low dynamic impedance for stable regulation under varying load conditions |
| Reverse Leakage (IR) | 1 µA max at VR = 24 V - minimizes standby current loss in always-on vehicle subsystems |
| Thermal Resistance (RθJS) | 9 °C/W junction-to-solder point - enables efficient heat transfer to PCB ground plane without external heatsink |
| Temperature Coefficient | +0.06 %/°C - provides predictable, monotonic voltage drift across -55°C to +150°C operating range |
| Package | PowerDI123 - surface-mount outline with exposed cathode tab for mechanical robustness and thermal performance |
Pinout & Package
PowerDI123 package features a 3-pin configuration with cathode connected to the large exposed metal tab (Pin 2), anode as lead (Pin 1), and no third functional terminal - the tab serves as both cathode connection and primary thermal path to PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead) | Current entry during forward bias; reference node during Zener operation | Connected to lower-potential side of protected circuit; soldered to signal or ground trace |
| Cathode (Exposed Tab) | Current exit during reverse breakdown; main thermal conduction path | Must be soldered to ≥1"×1" copper pour for rated 1W dissipation; electrically ties to system ground or rail return |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics including engine control units and ADAS power domains |
| Patented interlocking clip | US Patent #7,095,113 - enables 40A peak surge current handling (8.3ms half-sine) without bond wire failure |
| Green compound & finish | Halogen- and antimony-free molding compound (<900ppm Br/Cl, <1000ppm Sb); matte tin annealed over copper leadframe |
| Low RθJS | 9°C/W junction-to-solder point - reduces thermal derating in compact under-hood layouts |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Clamping 12V/24V supply rail transients induced by load dump or alternator switching. IC Role / Device Role / Timing Role: Primary overvoltage protection device placed directly across input rail before LDO or MCU power pins. Use Value: Withstands 40A surge per AEC-Q101 and maintains 33V clamp level within ±2V tolerance, preventing downstream IC damage. |
Use Scenario: Stabilizing reference voltage for 4–20mA transmitter output stages in process automation. IC Role / Device Role / Timing Role: Precision shunt regulator providing low-drift bias for op-amp feedback networks. Use Value: +0.06%/°C tempco and 5Ω ZZT ensure <±0.5% output variation over -40°C to +85°C ambient. |
| Telecom Power Interface Protection | Consumer Appliance Motor Drive Feedback |
Use Scenario: Protecting PoE-powered Ethernet PHY interfaces against induced surges on data lines. IC Role / Device Role / Timing Role: Bidirectional transient suppressor used in conjunction with TVS diodes for enhanced clamping margin. Use Value: Low leakage (1µA @ 24V) avoids loading sensitive PHY bias networks while delivering 1W steady-state dissipation capability. |
Use Scenario: Regulating gate drive voltage for N-channel MOSFETs in BLDC motor controllers. IC Role / Device Role / Timing Role: Shunt regulator establishing fixed 33V rail for high-side driver bootstrap capacitors. Use Value: Exposed cathode tab enables direct thermal coupling to motor controller PCB copper, sustaining 1W without thermal shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C33-7-F | 0.3W SOT-23 package; 33V ±5%; ZZT = 90Ω typical; RθJA = 300°C/W | Limited to low-power signal-level clamping; unsuitable for 1W automotive rail protection | Select only for space-constrained non-automotive signal conditioning where thermal load <300mW |
| MMSZ5257ET1G | 0.5W SOD-123; 33V ±5%; ZZT = 45Ω typical; AEC-Q101 qualified but no surge rating | Acceptable for industrial control logic rails but lacks interlocking clip for load-dump immunity | Prefer when cost sensitivity outweighs surge robustness; verify system-level transient testing |
Compared with BZX84-C33-7-F and MMSZ5257ET1G, DFLZ33Q-7 uniquely combines 1W dissipation, AEC-Q101 qualification, 40A surge capability, and 9°C/W thermal resistance - making it the only option validated for under-hood automotive power rail clamping.
Availability
DFLZ33Q-7 is available at Aetrix Electronics and suitable for automotive ECU designs, industrial sensor transmitters, telecom power interfaces, and consumer appliance motor drives requiring stable component supply with full AEC-Q101 compliance and traceable green sourcing.
Supply support for DFLZ33Q-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 centers across Asia and manufacturing in Taiwan and China.
The DFLZ series targets high-reliability automotive and industrial Zener regulation, emphasizing thermal robustness, surge resilience, and green material compliance - directly addressing needs in engine control, battery management, and harsh-environment sensing.
FAQ
What is the maximum surge current DFLZ33Q-7 can withstand?
DFLZ33Q-7 is rated for 40A peak surge current (8.3ms half-sine waveform) per AEC-Q101 qualification, enabled by its patented interlocking clip structure. This exceeds standard Zener diodes and supports automotive load-dump protection without external crowbar circuitry.
Is DFLZ33Q-7 compatible with lead-free reflow profiles?
Yes - DFLZ33Q-7 uses matte tin annealed over copper leadframe and complies with J-STD-020 moisture sensitivity Level 1. It supports standard lead-free reflow profiles up to 260°C peak temperature with no pre-bake required.
How does the PowerDI123 package improve thermal performance versus SOD-123?
PowerDI123's exposed cathode tab provides direct thermal conduction to PCB copper, achieving RθJS = 9°C/W - over 3× better than SOD-123's typical 30°C/W. This allows full 1W dissipation on standard FR-4 without heatsinks or thermal vias.
Does DFLZ33Q-7 require derating above 25°C ambient?
Yes - power dissipation must be linearly derated above 25°C using the curve in Figure 1 of DS36898. At 100°C ambient, maximum allowable power drops to ~0.23W. Derating is based on measured RθJA = 110°C/W on 1.5"×1.5" FR-4 with 2 oz. copper.
DFLZ33Q-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):
- 33 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 5 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
DFLZ33Q-7 FAQ
1.How can I place an order for DFLZ33Q-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DFLZ33Q-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 DFLZ33Q-7 reliable?
The price and inventory of DFLZ33Q-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DFLZ33Q-7 is usually 5 days.
3.What payment methods are accepted for DFLZ33Q-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DFLZ33Q-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DFLZ33Q-7?
DFLZ33Q-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DFLZ33Q-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 DFLZ33Q-7?
For technical support, including DFLZ33Q-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DFLZ33Q-7 requirements.
6.How does Aetrix verify that DFLZ33Q-7 is sourced from the original manufacturer or authorized distributors?
All DFLZ33Q-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 DFLZ33Q-7 meets industry standards.
7.What is the process for return or replacement of DFLZ33Q-7?
All DFLZ33Q-7 units undergo pre-shipment inspection (PSI). If there is an issue with DFLZ33Q-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 DFLZ33Q-7 part is unused and in its original packaging.
Return procedure for DFLZ33Q-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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