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Diodes Incorporated DFLZ39-7
- Part No.:
- DFLZ39-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- POWERDI®123
- Datasheet:
-
DFLZ39-7.pdf
- Description:
- DIODE ZENER 39V 1W POWERDI 123
- Quantity:
- Payment:
- Shipping:
Inventory:14,420
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Product details
Overview
DFLZ39-7 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 10mA test current, with 40Ω maximum Zener impedance and ±0.06%/°C temperature coefficient. It delivers stable voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation under industrial ambient conditions.
For engineers reviewing the DFLZ39-7 datasheet, DFLZ39-7 pinout, DFLZ39-7 application, or DFLZ39-7 equivalent, key selection criteria include its 1.0W FR-4 PCB power dissipation, 9°C/W junction-to-soldering-point thermal resistance, cathode-band polarity marking, and AEC-Q qualified reliability for automotive-adjacent designs.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable reference voltage across its terminals. Its 39V nominal Zener voltage is specified at IZT = 10mA, with 5Ω typical and 40Ω maximum dynamic impedance (ZZT) ensuring tight regulation under load transients.
Thermal performance is defined by RθJS = 9°C/W (junction-to-soldering point) and RθJA = 110°C/W (junction-to-ambient on 1.5"×1.5" FR-4), enabling reliable operation from –55°C to +150°C with derated power above +25°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39V nominal, 37–41V min/max range at IZT = 10mA - defines precise clamping threshold for protection or reference use. |
| Power Dissipation (PD) | 1.0W on FR-4 PCB - supports sustained regulation in compact power supplies without forced cooling. |
| Zener Impedance (ZZT) | 5Ω typical / 40Ω max at IZT = 10mA - low dynamic resistance minimizes output voltage variation under current changes. |
| Reverse Current (IR) | 1µA max at VR = 30V - ensures minimal leakage in high-impedance bias networks. |
| Temperature Coefficient | ±0.06%/°C - enables predictable voltage drift over industrial temperature range (–55°C to +150°C). |
| Thermal Resistance (RθJS) | 9°C/W - allows efficient heat transfer from die to PCB solder joint, critical for long-term reliability. |
Pinout & Package
Package: PowerDI123 - surface-mount, single-diode configuration with cathode band marking on top view; molded green plastic housing (UL 94V-0), matte tin annealed terminals, 0.01g mass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to system ground or low-side reference node; forms return path during reverse-bias regulation. |
| Cathode | Zener breakdown terminal / voltage clamp input | Connected to regulated rail or protected node; voltage at this terminal is clamped to ~39V when reverse biased above VZ. |
Key Features
| Feature | Design Value |
|---|---|
| 1.0W power rating on standard FR-4 | Enables robust voltage regulation without heatsinking in space-constrained industrial PCBs. |
| JEDEC-qualified high-reliability construction | Validated per AEC-Q standards for extended lifetime in harsh thermal and vibration environments. |
| Cathode band polarity marking | Ensures unambiguous orientation during automated placement and manual inspection. |
| Halogen- and antimony-free "Green" compound | Meets RoHS 3 (2015/863/EU) with <900ppm Br, <900ppm Cl, <1000ppm Sb - supports eco-compliant manufacturing. |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference providing precise 39V threshold to drive optocoupler LED when output exceeds setpoint. Use Value: Tight 37–41V tolerance and low 5Ω ZZT ensure accurate trip point and minimal regulation error across line/load variations. |
Use Scenario: Clamping transient surges on 24V DC bus lines in factory automation controllers. IC Role / Device Role / Timing Role: Shunt element that conducts excess energy to ground when bus voltage exceeds 39V. Use Value: 1.0W continuous dissipation and –55°C to +150°C operating range sustain repeated surge events without degradation. |
| Voltage Reference Generator | Automotive Body Control Module (BCM) |
Use Scenario: Generating stable 39V reference for analog-to-digital converter (ADC) scaling in sensor interface circuits. IC Role / Device Role / Timing Role: Precision shunt reference establishing known voltage for ratiometric measurement calibration. Use Value: ±0.06%/°C tempco and 1µA max leakage at 30V enable sub-0.5% reference drift over full industrial temperature range. |
Use Scenario: Providing regulated bias for LIN transceiver power rails in non-safety-critical vehicle subsystems. IC Role / Device Role / Timing Role: Secondary voltage clamp protecting 3.3V/5V LDO inputs from battery dump transients. Use Value: AEC-Q qualified construction and 110°C/W RθJA support operation in under-hood ambient up to +125°C with margin. |
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-C39 | 300mW SOT-23 package, 39V ±5%, ZZT = 90Ω max at 5mA - lower power, higher impedance. | Suitable only for low-current bias/reference use; not rated for 1W surge or continuous regulation. | Select when board space is critical and power demand stays below 300mW. |
| 1N4739A | 1.0W DO-41 through-hole package, 39V ±5%, ZZT = 50Ω max at 10mA - same power but larger footprint and no RoHS-3 compliance. | Requires wave soldering; lacks green compound and AEC-Q qualification. | Select for legacy through-hole designs where rework flexibility outweighs surface-mount efficiency. |
Compared with BZX84-C39 and 1N4739A, DFLZ39-7 uniquely combines 1.0W surface-mount capability, AEC-Q reliability, RoHS-3 compliance, and 40Ω max Zener impedance - making it optimal for modern industrial and automotive-adjacent power regulation where thermal density and regulatory alignment matter.
Availability
DFLZ39-7 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and voltage reference generators requiring stable component supply with traceable sourcing and lifecycle continuity.
Supply support for DFLZ39-7 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 and manufacturing operations across Asia and the Americas.
The DFLZ series belongs to Diodes' Power Discrete product line, engineered specifically for high-reliability voltage regulation and protection in industrial, computing, and automotive-qualified systems.
FAQ
What is the maximum reverse voltage (VR) at which DFLZ39-7 guarantees IR ≤ 1µA?
DFLZ39-7 guarantees reverse leakage current ≤ 1µA at VR = 30V, as specified in the Electrical Characteristics table. This value is measured under steady-state DC conditions at TA = +25°C and serves as the upper limit for low-leakage bias applications.
Can DFLZ39-7 be used in parallel for higher power handling?
No - DFLZ39-7 must not be paralleled due to inherent Zener voltage tolerances (37–41V) and mismatched temperature coefficients. Uneven current sharing would cause thermal runaway in one device. For >1.0W requirements, select a higher-rated Zener or implement active regulation.
Is the PowerDI123 package compatible with standard reflow profiles for lead-free soldering?
Yes - DFLZ39-7's matte tin annealed terminals meet MIL-STD-202 Method 208 solderability requirements and are qualified for standard Pb-free reflow profiles (peak 260°C, 10–30 sec), with moisture sensitivity level 1 per J-STD-020.
Does DFLZ39-7 have an automotive-grade variant?
Yes - the automotive-qualified version is designated DFLZ39Q and is documented in a separate datasheet (DS30464Q). It undergoes additional AEC-Q101 stress testing and is intended for body electronics, infotainment, and non-safety power systems.
DFLZ39-7 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):
- 40 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerDI™ 123
DFLZ39-7 FAQ
1.How can I place an order for DFLZ39-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DFLZ39-7 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 DFLZ39-7 reliable?
The price and inventory of DFLZ39-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DFLZ39-7 is usually 5 days.
3.What payment methods are accepted for DFLZ39-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DFLZ39-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DFLZ39-7?
DFLZ39-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DFLZ39-7 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 DFLZ39-7?
For technical support, including DFLZ39-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DFLZ39-7 requirements.
6.How does Aetrix verify that DFLZ39-7 is sourced from the original manufacturer or authorized distributors?
All DFLZ39-7 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 DFLZ39-7 meets industry standards.
7.What is the process for return or replacement of DFLZ39-7?
All DFLZ39-7 units undergo pre-shipment inspection (PSI). If there is an issue with DFLZ39-7, 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 DFLZ39-7 part is unused and in its original packaging.
Return procedure for DFLZ39-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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