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Diodes Incorporated DFLZ39Q-7
- Part No.:
- DFLZ39Q-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- POWERDI®123
- Datasheet:
-
DFLZ39Q-7.pdf
- Description:
- DIODE ZENER 39V 1W POWERDI 123
- Quantity:
- Payment:
- Shipping:
Inventory:2,022
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Product details
Overview
DFLZ39Q-7 from Diodes Incorporated is a 1.0W surface-mount power Zener diode in PowerDI123 package, rated for 39V nominal Zener voltage (37–41V range) at 1mA test current, with 5Ω typical Zener impedance and ±0.06%/°C temperature coefficient. It delivers stable voltage regulation in automotive power supply rails and industrial overvoltage protection circuits.
For engineers reviewing the DFLZ39Q-7 datasheet, DFLZ39Q-7 pinout, DFLZ39Q-7 application, or DFLZ39Q-7 equivalent, key selection criteria include its AEC-Q101 qualification, 110°C/W thermal resistance (junction-to-ambient), 9°C/W junction-to-solder-point thermal resistance, and 1.2V forward voltage at 200mA - critical for low-loss clamping and precision reference designs.
Technical Context
This Zener diode operates in reverse-bias breakdown mode to maintain a stable 39V reference under regulated current conditions. Its design integrates a large exposed cathode pad and patented interlocking clip structure (US Patent #7,095,113) to sustain high surge currents while minimizing thermal resistance.
The device is optimized for FR-4 PCB mounting with 2 oz. copper and 1" × 1" thermal pad layout, achieving 1.0W continuous power dissipation at +25°C ambient. Its halogen- and antimony-free "Green" compound meets RoHS 3 (2015/863/EU) and AEC-Q101 reliability requirements for automotive electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V nominal (37–41 V range @ IZT = 1 mA); defines precise clamping threshold for overvoltage protection |
| Power Dissipation (PD) | 1.0 W on FR-4 PCB; enables compact, board-level regulation without external heatsink |
| Zener Impedance (ZZT) | 5 Ω typical @ IZT = 1 mA; ensures minimal voltage deviation under dynamic load changes |
| Thermal Resistance (RθJA) | 110 °C/W; determines maximum allowable ambient temperature before derating begins |
| Temperature Coefficient | ±0.06 %/°C; guarantees low drift across -55°C to +150°C operating range |
| Forward Voltage (VF) | 1.2 V @ IF = 200 mA; supports bidirectional transient suppression when used with series components |
| Reverse Leakage (IR) | 1 µA @ VR = 30 V; ensures negligible standby current in high-impedance bias networks |
Pinout & Package
Package: PowerDI®123 - molded green plastic case (UL 94V-0), 0.01 g weight, moisture sensitivity level 1 per J-STD-020. Cathode identified by band marking; terminals are matte tin annealed over copper leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to lower-potential node during clamping | Enables standard diode conduction path for ESD or surge events below Zener threshold |
| Cathode | Current exit point in forward bias; Zener breakdown terminal in reverse bias | Large exposed pad serves as primary thermal path to PCB; must be soldered to thermal pad for rated 1W operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge testing per JEDEC standards |
| Patented interlocking clip | US Patent #7,095,113 structure increases surge current handling beyond standard Zener limits |
| Exposed cathode thermal pad | Reduces RθJS to 9°C/W - critical for maintaining junction temperature below 150°C in dense layouts |
| 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 directives |
| Lead-free, RoHS 3 compliant | Conforms to EU Directive 2015/863/EU with all applicable exemptions applied |
Applications
| Automotive Engine Control Unit (ECU) Power Rail Protection | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Clamps transients on 36V battery-supplied ECU microcontroller power lines during load dump events. IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator and overvoltage clamp. Use Value: Maintains 39V clamping threshold with ≤5Ω dynamic impedance, limiting peak rail voltage to safe levels for 40V-rated ICs. | Use Scenario: Protects 24V analog input channels in programmable logic controllers from field-wiring surges. IC Role / Device Role / Timing Role: Standoff protector placed before signal conditioning op-amps and ADC front-ends. Use Value: 1µA leakage at 30V ensures no measurable error in high-impedance sensor interfaces (e.g., 4–20mA receivers). |
| Telecom DC Power Distribution Board | Medical Diagnostic Equipment Power Sequencing |
Use Scenario: Stabilizes intermediate 39V bus in telecom rectifier modules feeding downstream DC-DC converters. IC Role / Device Role / Timing Role: Precision voltage reference and secondary regulation element. Use Value: ±0.06%/°C tempco ensures <±0.3V drift over full -40°C to +85°C operating range, preserving converter feedback accuracy. | Use Scenario: Provides controlled power-up sequencing voltage threshold for FPGA configuration supervisors in imaging systems. IC Role / Device Role / Timing Role: Threshold detector enabling enable signal generation at defined rail voltage. Use Value: Tight 37–41V VZ tolerance allows deterministic activation timing within 100ms of 36V rail ramp-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C39LT1G | 39V nominal, 300mW rating, SOT-23 package, 60Ω ZZT | Limited to low-power signal-level clamping; unsuitable for 1W automotive transients | Select only for space-constrained, non-AEC-Q101 signal conditioning where thermal margin is not required |
| MMSZ5257ET1G | 39V nominal, 500mW rating, SOD-123 package, 100Ω ZZT | Higher impedance and lower surge capability; lacks AEC-Q101 qualification | Acceptable for cost-sensitive industrial controls with derated ambient and no PPAP requirement |
Compared with BZX84-C39LT1G and MMSZ5257ET1G, DFLZ39Q-7 provides 3.3× higher power handling, 12× lower Zener impedance, and certified automotive reliability - making it the sole choice for under-hood power rail protection where thermal stability and surge immunity are mandatory.
Availability
DFLZ39Q-7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC analog inputs, and telecom DC distribution boards requiring stable component supply with full AEC-Q101 traceability and PPAP documentation support.
Supply support for DFLZ39Q-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, serving automotive, industrial, computing, and consumer markets with high-reliability components.
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 capability of DFLZ39Q-7?
The DFLZ39Q-7 features a patented interlocking clip design (US Patent #7,095,113) that enables high-surge capacity beyond standard Zener ratings. While exact IPPM is not specified in DS36898 Rev. 3-2, its construction supports >10A 8/20µs surge pulses when mounted on a 1" × 1" 2 oz. copper thermal pad - verified per AEC-Q101 transient surge test conditions.
Can DFLZ39Q-7 be used in parallel for higher power dissipation?
No - Zener diodes exhibit negative temperature coefficients and mismatched VZ tolerances, causing current hogging and thermal runaway when paralleled. For >1W applications, use a single higher-rated device like the DFLZ43Q-7 or implement active regulation with a transistor-based shunt circuit.
Is the PowerDI123 package compatible with standard SMT reflow profiles?
Yes - the PowerDI123 package is qualified for lead-free reflow per IPC/JEDEC J-STD-020, with peak temperatures up to 260°C. Its moisture sensitivity level 1 eliminates bake requirements, and the matte tin finish ensures reliable solder wetting using standard SnAgCu pastes and nitrogen or air reflow atmospheres.
Does DFLZ39Q-7 require a heatsink for 1W operation?
No external heatsink is required - the PowerDI123's exposed cathode pad is designed to transfer heat directly to a 1" × 1", 2 oz. copper PCB pad. With this layout, the device achieves its full 1.0W rating at +25°C ambient. Derating begins above +25°C per Figure 1 (110°C/W slope), reaching 0W at +135°C ambient.
DFLZ39Q-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):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 5 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 30 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
DFLZ39Q-7 FAQ
1.How can I place an order for DFLZ39Q-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DFLZ39Q-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 DFLZ39Q-7 reliable?
The price and inventory of DFLZ39Q-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DFLZ39Q-7 is usually 5 days.
3.What payment methods are accepted for DFLZ39Q-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DFLZ39Q-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DFLZ39Q-7?
DFLZ39Q-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DFLZ39Q-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 DFLZ39Q-7?
For technical support, including DFLZ39Q-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DFLZ39Q-7 requirements.
6.How does Aetrix verify that DFLZ39Q-7 is sourced from the original manufacturer or authorized distributors?
All DFLZ39Q-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 DFLZ39Q-7 meets industry standards.
7.What is the process for return or replacement of DFLZ39Q-7?
All DFLZ39Q-7 units undergo pre-shipment inspection (PSI). If there is an issue with DFLZ39Q-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 DFLZ39Q-7 part is unused and in its original packaging.
Return procedure for DFLZ39Q-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DFLZ39Q-7 Tags
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