My Inquiry
My Account
Diodes Incorporated DDZ27ASF-7
- Part No.:
- DDZ27ASF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
DDZ27ASF-7.pdf
- Description:
- DIODE ZENER 24.89V 500MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:7,641
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
DDZ27ASF-7 from Diodes Incorporated is a precision 0.5W surface-mount Zener diode in SOD323F package, designed for voltage regulation and reference applications with tight zener voltage tolerance (24.26–25.52 V at 5 mA), low dynamic impedance (70 Ω max), and low reverse leakage (0.07 µA @ 23.0 V). It operates across –65°C to +150°C and is qualified for automotive-grade assembly per AEC-Q200 requirements.
For engineers reviewing the DDZ27ASF-7 datasheet, DDZ27ASF-7 pinout, DDZ27ASF-7 application, or DDZ27ASF-7 equivalent, this part serves as a stable, RoHS-compliant, halogen-free voltage reference in space-constrained analog power rails, sensor biasing circuits, and overvoltage protection stages where thermal stability and low leakage are critical.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal zener voltage of 24.8 V (typical) at test current IZT = 5 mA, exhibiting a temperature coefficient of approximately +12 mV/°C near 27 V. Its low RθJA of 250°C/W enables reliable operation on standard FR-4 PCBs without heatsinking.
The device features a cathode band marking for polarity identification, matte tin–annealed copper alloy terminals for robust solderability, and moisture sensitivity level 1 per J-STD-020 - supporting reflow compatibility and automated placement without baking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 24.26–25.52 V @ IZT = 5 mA - defines precise regulation window for mid-range voltage references. |
| Power Dissipation (PD) | 500 mW on FR-4 - supports continuous operation in compact power management blocks without derating below 70°C ambient. |
| Zener Impedance (ZZT) | ≤70 Ω @ 1 kHz - ensures minimal output voltage variation under dynamic load transients. |
| Reverse Leakage (IR) | 0.07 µA @ VR = 23.0 V - enables ultra-low quiescent current in battery-backed or high-impedance sensing circuits. |
| Thermal Resistance (RθJA) | 250°C/W - allows direct thermal modeling on standard 10 mm × 10 mm copper pads without additional thermal vias. |
| Operating Temperature | –65°C to +150°C - supports deployment in under-hood automotive, industrial motor control, and outdoor power electronics. |
| Package | SOD323F - 2.5 mm × 1.7 mm footprint with 0.4 mm lead pitch, optimized for high-density PCB layouts and pick-and-place automation. |
Pinout & Package
Package: SOD323F - molded plastic, UL 94V-0 rated, halogen- and antimony-free "Green" compound. Cathode identified by band marking on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to system ground or lower-potential rail; establishes reference return path during regulation. |
| Cathode | Zener breakdown terminal / regulated output node | Provides stable voltage output when reverse-biased; must be connected to supply rail requiring clamping or referencing. |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage regulation | ±2.5% VZ tolerance (24.26–25.52 V) enables accurate analog reference without trimming. |
| Automated assembly compatibility | SOD323F package with matte tin–annealed leads meets IPC-J-STD-020 reflow profiles and MIL-STD-202 solderability. |
| Environmental compliance | Fully RoHS 3 compliant, halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb), supporting green manufacturing mandates. |
| High-temperature reliability | Rated for continuous operation up to +150°C junction temperature - suitable for engine control units and power converters. |
Applications
| Industrial Power Supply Reference | Automotive Sensor Biasing |
|---|---|
|
Use Scenario: Providing stable 24.8 V reference for isolated DC-DC feedback loops in programmable logic controller (PLC) power modules. IC Role / Device Role / Timing Role: Zener diode functions as primary voltage reference for optocoupler-based error amplification stage. Use Value: Tight VZ tolerance and low ZZT minimize output voltage drift across line/load/temperature, improving regulation accuracy to ±0.5%. |
Use Scenario: Biasing pressure and temperature sensors in engine management systems operating at ambient temperatures up to 125°C. IC Role / Device Role / Timing Role: Supplies stable excitation voltage to bridge-type sensors while rejecting supply ripple. Use Value: Low IR (0.07 µA) prevents loading of high-impedance sensor outputs; wide TJ range ensures functionality during cold cranking and hot soak. |
| Overvoltage Protection Clamp | Portable Instrumentation Reference |
|
Use Scenario: Clamping transient surges on 24 V CAN bus power lines in vehicle infotainment head units. IC Role / Device Role / Timing Role: Acts as shunt protector, diverting excess energy to ground when input exceeds 25.5 V. Use Value: 500 mW rating sustains short-duration transients; SOD323F footprint enables placement directly at connector entry point. |
Use Scenario: Generating precision reference for 16-bit ADCs in handheld multimeters and calibration equipment. IC Role / Device Role / Timing Role: Provides low-noise, thermally stable reference voltage independent of main supply fluctuations. Use Value: +12 mV/°C TC and 70 Ω ZZT limit reference drift to <1 LSB over 0–50°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C27LT1G | 27 V nominal, ±5% tolerance, 300 mW rating, SOT-23 package | Higher VZ tolerance and lower power handling reduce regulation accuracy in precision rails | Select when cost sensitivity outweighs tight voltage stability and thermal performance. |
| MMSZ5256ET1G | 27 V nominal, ±5% tolerance, 500 mW rating, SOD-123 package | Larger SOD-123 footprint and higher RθJA (~350°C/W) limit high-temperature density | Choose only if legacy board layout prohibits SOD323F footprint or requires alternate tape/reel configuration. |
Compared with BZX84-C27LT1G and MMSZ5256ET1G, DDZ27ASF-7 delivers superior voltage accuracy (±2.5% vs. ±5%), lower thermal resistance (250°C/W vs. ≥350°C/W), and tighter leakage control - making it optimal for high-reliability, thermally constrained, and precision analog designs.
Availability
DDZ27ASF-7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor interfaces, overvoltage protection circuits, and portable instrumentation requiring stable component supply and long-term manufacturability.
Supply support for DDZ27ASF-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, specializing in high-reliability components for automotive, industrial, and consumer markets with ISO/TS 16949 and IATF 16949 certified facilities.
This part belongs to the DDZxxASF–DDZxxDSF precision Zener series, engineered specifically for high-stability voltage referencing in space-constrained, thermally demanding environments where low leakage and tight tolerance are non-negotiable.
FAQ
What is the maximum reverse voltage (VR) that DDZ27ASF-7 can withstand before breakdown?
DDZ27ASF-7 begins controlled zener breakdown at its specified VZ range of 24.26–25.52 V when reverse-biased at IZT = 5 mA. Below this threshold - specifically at VR = 23.0 V - reverse leakage remains ≤0.07 µA. It is not rated for sustained operation above VZ without current limiting.
Does DDZ27ASF-7 meet AEC-Q200 stress testing requirements for passive components?
Yes - Diodes Incorporated qualifies the DDZ27ASF-7 family for automotive applications requiring AEC-Q200 compliance. The device is manufactured in IATF 16949 certified facilities and supports PPAP documentation upon request, with full qualification data available in the DS31987 datasheet revision history.
Can DDZ27ASF-7 be used in parallel for higher power dissipation?
No - Zener diodes exhibit negative temperature coefficients at lower voltages but positive coefficients above ~5 V; DDZ27ASF-7 has a +12 mV/°C TC, causing thermal runaway if paralleled without individual ballast resistors. For >500 mW needs, use a single higher-rated device or active regulation.
What is the recommended pad layout for SOD323F mounting of DDZ27ASF-7?
Per Diodes' package outline DS31987 Rev. 23, the recommended SOD323F pad layout uses G = 1.28 mm, X = 0.71 mm, X1 = 2.70 mm, and Y = 0.403 mm (all in mm). This ensures coplanarity, solder joint integrity, and thermal transfer matching the 250°C/W RθJA specification on FR-4.
DDZ27ASF-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-90, SOD-323F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 24.89 V
- Tolerance:
- ±3%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 70 nA @ 23 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323F
DDZ27ASF-7 FAQ
1.How can I place an order for DDZ27ASF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ27ASF-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 DDZ27ASF-7 reliable?
The price and inventory of DDZ27ASF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ27ASF-7 is usually 5 days.
3.What payment methods are accepted for DDZ27ASF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ27ASF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ27ASF-7?
DDZ27ASF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ27ASF-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 DDZ27ASF-7?
For technical support, including DDZ27ASF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ27ASF-7 requirements.
6.How does Aetrix verify that DDZ27ASF-7 is sourced from the original manufacturer or authorized distributors?
All DDZ27ASF-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 DDZ27ASF-7 meets industry standards.
7.What is the process for return or replacement of DDZ27ASF-7?
All DDZ27ASF-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ27ASF-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 DDZ27ASF-7 part is unused and in its original packaging.
Return procedure for DDZ27ASF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DDZ27ASF-7 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
