My Inquiry
My Account
Diodes Incorporated DDZ39ASF-7
- Part No.:
- DDZ39ASF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
DDZ39ASF-7.pdf
- Description:
- DIODE ZENER 35.58V 500MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:1,715
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
DDZ39ASF-7 from Diodes Incorporated is a precision 39 V Zener diode in SOD323F package, designed for voltage regulation and reference applications with ±2.3% zener voltage tolerance (34.68–36.47 V at 5 mA), 85 Ω dynamic impedance, and 0.2 µA reverse leakage at 30 V. It delivers stable reference performance in power supply feedback loops, overvoltage protection circuits, and analog sensor biasing under industrial temperature conditions.
For engineers reviewing the DDZ39ASF-7 datasheet, DDZ39ASF-7 pinout, DDZ39ASF-7 application, or DDZ39ASF-7 equivalent, this device is selected for high-accuracy voltage clamping where tight VZ tolerance, low thermal drift, and surface-mount compatibility with automated assembly are critical design requirements.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal zener voltage of 39 V, specified at IZT = 5 mA. Its temperature coefficient is +0.07 mV/°C (typical for 39 V devices per Fig. 3), enabling predictable drift compensation in reference designs. The device uses planar epitaxial construction for stable long-term parametric behavior.
Thermal resistance is 250 °C/W (junction-to-ambient, FR-4 PCB), and maximum power dissipation is 500 mW at 25 °C ambient. Derating begins linearly above 25 °C per Fig. 1, reaching zero dissipation at 150 °C. Reverse leakage remains ≤0.2 µA up to 30 V, ensuring minimal error current in high-impedance reference nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 34.68–36.47 V @ IZT = 5 mA - defines precise clamping threshold for feedback and protection circuits |
| Zener Impedance (ZZT) | 85 Ω @ f = 1 kHz - limits output voltage variation under load transients in reference applications |
| Reverse Leakage (IR) | ≤0.2 µA @ VR = 30 V - minimizes error current in high-Z bias networks and ADC references |
| Power Dissipation (PD) | 500 mW on FR-4 PCB - supports continuous operation in compact power management modules |
| Thermal Resistance (RθJA) | 250 °C/W - enables thermal modeling for board-level reliability in ambient temperatures up to +125 °C |
| Operating Temperature | −65 to +150 °C - qualified for extended industrial and automotive under-hood environments |
| Package | SOD323F - 2-pin surface-mount outline with cathode band marking, compatible with standard reflow profiles |
Pinout & Package
Package: SOD323F - ultra-small plastic surface-mount package (2.50 mm × 1.70 mm × 1.25 mm), molded with halogen-free green compound, UL 94V-0 rated, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground node | Connected to circuit ground or lower-potential rail; establishes reference return path for regulated output |
| Cathode | Zener breakdown terminal / regulated voltage output node | Provides stable 39 V reference when reverse-biased; used directly as voltage clamp or feedback point |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage tolerance | ±2.3% (34.68–36.47 V) - reduces calibration overhead in closed-loop power supplies |
| Low dynamic impedance | 85 Ω at 1 kHz - maintains <1% output deviation during 10 mA load steps in reference buffers |
| Ultra-low reverse leakage | ≤0.2 µA @ 30 V - preserves accuracy in high-impedance sensor excitation and DAC reference paths |
| Automated assembly compatibility | SOD323F footprint with matte tin annealed terminals - ensures reliable solder joint formation in high-speed pick-and-place lines |
| Environmental compliance | RoHS 3 (2015/863/EU), halogen- and antimony-free - meets Tier 1 automotive and industrial sustainability mandates |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Circuit |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Zener reference providing precise 39 V threshold for TL431-like comparator input or direct optocoupler LED biasing. Use Value: Tight VZ tolerance ensures ±1.5% output regulation without secondary-side trimming resistors. |
Use Scenario: Clamping surge-induced transients on 24 V DC bus lines in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Fast-acting shunt element diverting excess energy to ground before downstream ICs exceed absolute maximum ratings. Use Value: Low ZZT and stable 39 V breakdown prevent voltage overshoot beyond 40 V during 100 ns–1 µs transients. |
| High-Voltage Sensor Biasing | ADC Reference Stabilization |
|
Use Scenario: Providing stable excitation voltage for piezoresistive pressure sensors operating from 24 V rails. IC Role / Device Role / Timing Role: Precision voltage source delivering constant 39 V bias across sensor bridge, independent of supply ripple. Use Value: ≤0.2 µA leakage avoids loading errors in 10 MΩ+ sensor interfaces, preserving 16-bit measurement linearity. |
Use Scenario: Generating a clean, low-noise reference for 12-bit SAR ADCs in data acquisition front-ends. IC Role / Device Role / Timing Role: Low-drift Zener feeding RC-filtered buffer amplifier to drive ADC REF pin. Use Value: 250 °C/W RθJA and −65 to +150 °C range enable stable reference performance across wide ambient swings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C39LT1G | 39 V nominal, ±5% tolerance (37–41 V), 90 Ω ZZT, 0.5 µA IR @ 30 V | Higher VZ spread increases calibration burden; higher leakage affects high-Z sensor biasing | Select when cost sensitivity outweighs precision requirements and board space allows larger SOT-23 footprint |
| MMSZ5249B-TP | 39 V nominal, ±5% tolerance (37–41 V), 100 Ω ZZT, 0.1 µA IR @ 30 V | Lower leakage but wider tolerance and higher impedance reduce regulation fidelity in dynamic loads | Prefer for ultra-low-leakage needs where ±5% VZ is acceptable and SOD-123 package fits layout constraints |
Compared with BZX84-C39LT1G and MMSZ5249B-TP, DDZ39ASF-7 offers superior voltage accuracy and lower dynamic impedance-critical for closed-loop regulation-while maintaining identical SOD323F footprint and RoHS/Green compliance.
Availability
DDZ39ASF-7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, sensor signal conditioning circuits, and test equipment requiring stable component supply with full traceability and lifecycle continuity.
Supply support for DDZ39ASF-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 industrial, automotive, and computing markets.
This device belongs to the DDZxxASF–DDZxxDSF precision Zener series, engineered for voltage reference stability, low thermal drift, and automated manufacturing compatibility in space-constrained applications.
FAQ
What is the exact zener voltage range for DDZ39ASF-7 at 5 mA?
The confirmed zener voltage range is 34.68 V to 36.47 V at IZT = 5 mA and TA = +25°C, per Electrical Characteristics Table on page 3 of DS31987 Rev. 23–2. This corresponds to ±2.3% tolerance about the nominal 39 V rating.
Can DDZ39ASF-7 be used in automotive applications?
Yes-DDZ39ASF-7 is manufactured in IATF 16949 certified facilities and supports PPAP documentation. While not pre-qualified to AEC-Q101, its −65 to +150 °C operating range, RoHS 3 compliance, and halogen-free construction meet baseline automotive environmental requirements for non-safety-critical modules.
What is the recommended PCB pad layout for SOD323F mounting?
The official Diodes-recommended SOD323F pad layout specifies G = 1.280 mm, X = 0.710 mm, X1 = 2.700 mm, and Y = 0.403 mm (all in mm), per Package Outline Dimensions document linked in DS31987. These dimensions ensure optimal solder fillet formation and mechanical reliability during thermal cycling.
How does temperature affect the zener voltage of DDZ39ASF-7?
Per Figure 3 in DS31987, the temperature coefficient for 39 V Zeners in this family is +0.07 mV/°C (typical). This results in a +7 mV increase in VZ over a 100 °C rise, enabling predictable drift compensation in reference designs without external circuitry.
DDZ39ASF-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-90, SOD-323F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 35.58 V
- Tolerance:
- ±3%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 85 Ohms
- Current - Reverse Leakage @ Vr:
- 200 nA @ 30 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
DDZ39ASF-7 FAQ
1.How can I place an order for DDZ39ASF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ39ASF-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 DDZ39ASF-7 reliable?
The price and inventory of DDZ39ASF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ39ASF-7 is usually 5 days.
3.What payment methods are accepted for DDZ39ASF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ39ASF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ39ASF-7?
DDZ39ASF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ39ASF-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 DDZ39ASF-7?
For technical support, including DDZ39ASF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ39ASF-7 requirements.
6.How does Aetrix verify that DDZ39ASF-7 is sourced from the original manufacturer or authorized distributors?
All DDZ39ASF-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 DDZ39ASF-7 meets industry standards.
7.What is the process for return or replacement of DDZ39ASF-7?
All DDZ39ASF-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ39ASF-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 DDZ39ASF-7 part is unused and in its original packaging.
Return procedure for DDZ39ASF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DDZ39ASF-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…
