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Diodes Incorporated DFLZ22-7
- Part No.:
- DFLZ22-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- POWERDI®123
- Datasheet:
-
DFLZ22-7.pdf
- Description:
- DIODE ZENER 22V 1W POWERDI 123
- Quantity:
- Payment:
- Shipping:
Inventory:8,423
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Product details
Overview
DFLZ22-7 from Diodes Incorporated is a 1.0W surface-mount power Zener diode in PowerDI123 package, providing precise 22V nominal Zener voltage (20.8–23.3V range) at 25mA test current, with 15Ω maximum Zener impedance and ±0.06%/°C temperature coefficient - used for voltage regulation and overvoltage protection in DC power rails of industrial power supplies.
For engineers reviewing the DFLZ22-7 datasheet, DFLZ22-7 pinout, DFLZ22-7 application, or DFLZ22-7 equivalent, key selection criteria include its 1W FR-4 power dissipation capability, automotive-qualified variant availability (DFLZ22Q), JEDEC high-reliability qualification, and cathode-band polarity marking for unambiguous PCB orientation.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and line conditions. Its 22V nominal Zener voltage is specified at IZT = 25mA, with low dynamic impedance (≤15Ω) ensuring minimal output voltage deviation during transient current changes.
Thermal performance is defined by RθJA = 110°C/W on standard FR-4 (1.5"×1.5", 2 oz Cu), and RθJS = 9°C/W to soldering point - enabling reliable operation up to +150°C junction temperature when properly mounted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22V nominal, 20.8–23.3V min/max at IZT = 25mA - defines regulated output voltage tolerance in feedback or clamp circuits. |
| Power Dissipation (PD) | 1.0W on FR-4 PCB - supports sustained regulation in compact industrial power stages without active cooling. |
| Zener Impedance (ZZT) | ≤15Ω max at IZT = 25mA - ensures tight voltage regulation under dynamic load steps. |
| Temperature Coefficient | ±0.06%/°C - enables predictable VZ drift across -55°C to +150°C operating range. |
| Reverse Leakage (IR) | ≤1µA at VR = 16V - guarantees low standby power loss in always-on protection circuits. |
| Forward Voltage (VF) | 1.2V at IF = 200mA - relevant for series-connected forward-bias applications or ESD path analysis. |
Pinout & Package
Package: PowerDI123 - surface-mount, single-ended, cathode-band marked case with matte tin–annealed copper leadframe; UL 94V-0 molded plastic body; 0.01g mass; moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to lower-potential node in Zener regulation. | Electrically tied to leadframe tab; requires thermal pad connection for optimal power handling. |
| Cathode | Current exit terminal in forward bias; connected to higher-potential node in Zener regulation. | Marked by visible band; functions as regulated output node in shunt regulator configurations. |
Key Features
| Feature | Design Value |
|---|---|
| 1W power rating on standard FR-4 | Enables direct integration into cost-sensitive industrial PCBs without heatsinks or layout redesign. |
| JEDEC-qualified high reliability | Validated per AEC-Q stress tests - suitable for mission-critical power monitoring in factory automation. |
| Cathode-band polarity marking | Eliminates orientation errors during automated placement and visual inspection on production lines. |
| Halogen- and antimony-free "Green" compound | Meets IPC-1752A environmental compliance requirements for RoHS 3 and WEEE-constrained markets. |
Applications
| Industrial Power Supply Regulation | Automotive ECU Voltage Clamp |
|---|---|
Use Scenario: Stabilizing 24V rail feedback in isolated DC-DC converters for PLC modules. IC Role / Device Role / Timing Role: Shunt Zener reference in optocoupler feedback loop to maintain ±1% output accuracy. Use Value: 15Ω ZZT minimizes load-induced error; 1W rating sustains regulation during 100ms brownout recovery. |
Use Scenario: Protecting microcontroller I/O pins against load-dump transients in 12V/24V vehicle ECUs. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp placed directly at MCU input pin. Use Value: 22V clamping threshold aligns with ISO 7637-2 Pulse 5a limits; <1µA leakage avoids signal distortion. |
| Telecom Line Card Protection | Test Equipment Reference Source |
Use Scenario: Safeguarding Ethernet PHY interface from induced surges on PoE-powered line cards. IC Role / Device Role / Timing Role: Secondary clamp after TVS, fine-tuning clamping level to match PHY absolute max ratings. Use Value: Tight 20.8–23.3V VZ window ensures margin below 24V PHY limit while avoiding false triggering. |
Use Scenario: Providing stable 22V reference for calibrating multimeter front-end ADCs. IC Role / Device Role / Timing Role: Precision shunt reference in buffered voltage divider network. Use Value: ±0.06%/°C TC enables <0.1% drift over 0–50°C lab environment; low ZZT maintains accuracy under meter loading. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C22-7 | 0.3W SOT-23 package; 22V ±5%; ZZT ≤ 50Ω; RθJA ≈ 300°C/W. | Limited to low-power signal-level clamping; unsuitable for >100mA regulation loads. | Select when board space is constrained and power <300mW; avoid for power rail stabilization. |
| 1N4748A-T | 1W DO-41 through-hole; 22V ±5%; ZZT ≤ 23Ω; no automotive qualification. | Requires wave-soldering; incompatible with fully SMT production; lacks AEC-Q validation. | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required. |
Compared with BZX84-C22-7 and 1N4748A-T, DFLZ22-7 uniquely combines 1W SMT power handling, automotive-grade reliability, and tight 22V tolerance in PowerDI123 - making it optimal for production-grade industrial and automotive power management where thermal robustness and assembly scalability matter.
Availability
DFLZ22-7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECUs, telecom line cards, and precision test equipment requiring stable component supply and long-term manufacturability.
Supply support for DFLZ22-7 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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design centers across Asia, Europe, and the US.
The DFLZ series belongs to Diodes' high-reliability Zener portfolio targeting voltage regulation and protection in harsh-environment applications - engineered for consistent performance across extended temperature and lifetime requirements.
FAQ
What is the maximum continuous reverse current the DFLZ22-7 can handle before thermal runaway?
DFLZ22-7 is rated for 1.0W dissipation at 25°C ambient. At 22V Zener voltage, this corresponds to ~45.5mA average reverse current. Derating applies above 25°C per Figure 1: at 70°C ambient, max safe current drops to ~27mA. Exceeding these limits risks exceeding 150°C junction temperature and irreversible degradation.
Does the DFLZ22-7 require a heatsink on standard FR-4 PCB?
No external heatsink is required. The PowerDI123 package achieves RθJA = 110°C/W on a 1.5"×1.5", 2 oz Cu FR-4 board with 1"×1" thermal pad - sufficient for full 1W operation at ≤50°C ambient. For >50°C environments, increasing copper area or adding internal planes improves thermal margin.
How does the DFLZ22-7 differ from the automotive-grade DFLZ22Q-7?
DFLZ22Q-7 undergoes additional AEC-Q200 stress testing (temperature cycling, humidity bias, mechanical shock) and is manufactured in IATF 16949-certified facilities. Electrically identical, but DFLZ22Q-7 carries automotive PPAP documentation and lot-level traceability - mandatory for Tier 1 automotive suppliers.
Can the DFLZ22-7 be used in series or parallel configurations for higher voltage or current handling?
Series connection is viable for higher voltage references (e.g., two DFLZ22-7 yield ~44V), but mismatched Zener impedances cause uneven voltage division. Parallel use is strongly discouraged - minor VZ variations cause current hogging and thermal instability. Use single-device configuration or dedicated high-power Zeners instead.
DFLZ22-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- POWERDI®123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 22 V
- Tolerance:
- ±6%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 16 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
DFLZ22-7 FAQ
1.How can I place an order for DFLZ22-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DFLZ22-7 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 DFLZ22-7 reliable?
The price and inventory of DFLZ22-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DFLZ22-7 is usually 5 days.
3.What payment methods are accepted for DFLZ22-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DFLZ22-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DFLZ22-7?
DFLZ22-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DFLZ22-7 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 DFLZ22-7?
For technical support, including DFLZ22-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DFLZ22-7 requirements.
6.How does Aetrix verify that DFLZ22-7 is sourced from the original manufacturer or authorized distributors?
All DFLZ22-7 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 DFLZ22-7 meets industry standards.
7.What is the process for return or replacement of DFLZ22-7?
All DFLZ22-7 units undergo pre-shipment inspection (PSI). If there is an issue with DFLZ22-7, 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 DFLZ22-7 part is unused and in its original packaging.
Return procedure for DFLZ22-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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