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Diodes Incorporated DFLZ27-7
- Part No.:
- DFLZ27-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- POWERDI®123
- Datasheet:
-
DFLZ27-7.pdf
- Description:
- DIODE ZENER 27V 1W POWERDI 123
- Quantity:
- Payment:
- Shipping:
Inventory:36,067
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Product details
Overview
DFLZ27-7 from Diodes Incorporated is a 1.0W surface-mount power Zener diode in PowerDI123 package, providing precise 27V nominal Zener voltage (25.1–28.9V range) at 25mA test current, with 15Ω maximum Zener impedance and ±0.06%/°C temperature coefficient - used for overvoltage protection and voltage regulation in DC power rails.
For engineers reviewing the DFLZ27-7 datasheet, DFLZ27-7 pinout, DFLZ27-7 application, or DFLZ27-7 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (9°C/W junction-to-solder point), JEDEC-qualified reliability, RoHS-compliant green packaging, and FR-4 PCB power derating behavior above +25°C ambient.
Technical Context
This Zener diode operates in reverse-bias breakdown mode to clamp transient overvoltages and stabilize reference voltages. It delivers stable regulation across -55°C to +150°C operating range with 1.0W dissipation on standard FR-4 PCB layouts and exhibits low 15Ω dynamic impedance at IZT = 25mA.
Its PowerDI123 package features matte tin-annealed copper leadframe terminals, UL 94V-0 molded plastic housing, and moisture sensitivity level 1 - enabling high-reliability automotive and industrial deployments without special handling requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27V nominal, 25.1–28.9V min/max - ensures tight regulation window for 24V system rail clamping |
| Test Current (IZT) | 25mA - defines operating point where Zener voltage and impedance are specified |
| Zener Impedance (ZZT) | ≤15Ω max - limits voltage deviation under load transients |
| Power Dissipation (PD) | 1.0W on FR-4 PCB - supports robust thermal performance without heatsinking |
| Thermal Resistance (RθJS) | 9°C/W - enables rapid heat transfer from die to solder joint for sustained operation |
| Temp. Coefficient (αVZ) | +0.06%/°C max - minimizes drift in temperature-sensitive reference circuits |
| Reverse Leakage (IR) | ≤1µA @ VR = 20V - ensures low standby power loss in always-on protection paths |
Pinout & Package
Package: PowerDI123 - compact 3-pin surface-mount outline with cathode band marking, 0.01g mass, UL 94V-0 green molding compound, and 1.5" × 1.5" FR-4 pad layout compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-bias regulation configuration |
| Cathode | Zener breakdown terminal | Marked with band; connected to higher-potential rail for clamping action |
| Cathode Tab | Thermal & electrical connection | Exposed metal tab serves as primary heat path to PCB and common cathode node |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-qualified reliability | Qualified per AEC-Q standards for high-reliability automotive and industrial use |
| Green packaging | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb) compliant with RoHS 3 |
| Low thermal resistance | 9°C/W junction-to-solder point enables stable operation up to +150°C ambient |
| Stable voltage regulation | ±0.06%/°C tempco and ≤15Ω ZZT ensure minimal output variation across temperature/load |
| FR-4 PCB optimized | 1.0W dissipation rating defined on standard 2 oz. copper 1"×1" pad - no custom layout needed |
Applications
| Industrial Power Supply Protection | Automotive ECU Voltage Reference |
|---|---|
Use Scenario: Clamping 24V DC bus against load-dump transients in programmable logic controllers. IC Role / Device Role / Timing Role: Standalone Zener shunt regulator acting as primary overvoltage clamp. Use Value: 1.0W power rating and 27V Zener voltage match ISO 16750-2 load-dump waveform thresholds. | Use Scenario: Providing stable 27V reference for microcontroller reset supervisor ICs in engine control units. IC Role / Device Role / Timing Role: Precision voltage reference source for analog comparator inputs. Use Value: ±0.06%/°C tempco ensures <±0.5V drift over -40°C to +125°C ECU operating range. |
| Telecom DC-DC Converter Feedback | Medical Equipment Overvoltage Clamp |
Use Scenario: Secondary-side voltage sensing in isolated 24V-to-5V flyback converters for base station radios. IC Role / Device Role / Timing Role: Zener-based feedback node for optocoupler-coupled regulation loop. Use Value: 15Ω ZZT maintains loop stability under fast load steps without compensation redesign. | Use Scenario: Safeguarding patient-connected analog front-end circuitry from power rail surges in diagnostic imaging systems. IC Role / Device Role / Timing Role: Fail-safe shunt limiter on isolated 24V auxiliary supply rail. Use Value: AEC-Q qualified construction and -55°C to +150°C rating support IEC 60601-1 safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C27LT1G | 0.3W rating, SOT-23 package, 27V ±5% tolerance, 35Ω ZZT | Limited to low-power signal-level regulation; unsuitable for >100mA clamping | Select when board space is constrained and power dissipation <300mW |
| MMSZ5252ET1G | 0.5W rating, SOD-123 package, 27V ±5%, 35Ω ZZT, higher RθJA (270°C/W) | Requires thermal relief pads for >250mW operation; less stable under thermal cycling | Select for cost-sensitive consumer designs where full 1W capability is not required |
Compared with BZX84-C27LT1G and MMSZ5252ET1G, DFLZ27-7 provides 2.0–3.3× higher power handling, 2.3× lower Zener impedance, and 30× better thermal resistance - making it the only choice for sustained 1W clamping in industrial and automotive environments.
Availability
DFLZ27-7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECUs, telecom DC-DC converters, and medical equipment requiring stable component supply with long lifecycle assurance.
Supply support for DFLZ27-7 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' Power Discrete product line, engineered specifically for high-reliability voltage regulation and transient suppression in harsh-environment applications including automotive, industrial automation, and telecom infrastructure.
FAQ
What is the maximum continuous power dissipation for DFLZ27-7 on a standard PCB?
DFLZ27-7 is rated for 1.0W continuous power dissipation when mounted on a 1.5" × 1.5", 2 oz. copper FR-4 PCB with a 1" × 1" thermal pad layout. Derating begins linearly above +25°C ambient, reaching zero watt capability at +150°C per the published power derating curve.
Does DFLZ27-7 have automotive qualification?
The standard DFLZ27-7 is JEDEC-qualified for high reliability but not AEC-Q200 certified. For automotive applications, Diodes offers the pin- and form-compatible DFLZ27Q variant, which carries full AEC-Q200 Grade 1 qualification (-40°C to +125°C) and is documented in a separate datasheet (DS30464Q).
How is polarity identified on the PowerDI123 package?
Polarity is marked by a cathode band located at one end of the PowerDI123 body - this band aligns with the cathode terminal (pin 2) and the exposed cathode tab. The anode is the unmarked terminal opposite the band, and the cathode tab serves as both thermal path and electrical connection.
What is the typical forward voltage drop at 200mA?
At 200mA forward current and +25°C ambient, the typical forward voltage drop (VF) is 1.2V. This value remains stable across the full operating temperature range and is verified per MIL-STD-202, Method 208 solderability testing on matte tin-annealed terminals.
DFLZ27-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- POWERDI®123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±7%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 20 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
DFLZ27-7 FAQ
1.How can I place an order for DFLZ27-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DFLZ27-7 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 DFLZ27-7 reliable?
The price and inventory of DFLZ27-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DFLZ27-7 is usually 5 days.
3.What payment methods are accepted for DFLZ27-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DFLZ27-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DFLZ27-7?
DFLZ27-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DFLZ27-7 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 DFLZ27-7?
For technical support, including DFLZ27-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DFLZ27-7 requirements.
6.How does Aetrix verify that DFLZ27-7 is sourced from the original manufacturer or authorized distributors?
All DFLZ27-7 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 DFLZ27-7 meets industry standards.
7.What is the process for return or replacement of DFLZ27-7?
All DFLZ27-7 units undergo pre-shipment inspection (PSI). If there is an issue with DFLZ27-7, 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 DFLZ27-7 part is unused and in its original packaging.
Return procedure for DFLZ27-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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