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Diodes Incorporated DDZ39CSF-7
- Part No.:
- DDZ39CSF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
DDZ39CSF-7.pdf
- Description:
- DIODE ZENER 36.93V 500MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:2,336
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Product details
Overview
DDZ39CSF-7 from Diodes Incorporated is a precision 36.0–37.85 V, 5 mA Zener diode in SOD323F package, rated for 500 mW power dissipation on FR-4 PCB, with 85 Ω maximum zener impedance at 1 kHz and 0.2 µA reverse leakage at 30 V, used for voltage regulation and reference in power supply feedback loops.
For engineers reviewing the DDZ39CSF-7 datasheet, DDZ39CSF-7 pinout, DDZ39CSF-7 application, or DDZ39CSF-7 equivalent, this part supports stable voltage reference design in automotive and industrial DC-DC converters where tight VZ tolerance (±2.5%), low thermal resistance (250 °C/W), and AEC-Q200-compatible packaging are required.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable reference voltage across its cathode-anode terminals. Its 5 mA test current (IZT) ensures consistent VZ measurement under standardized conditions, while the 85 Ω dynamic impedance (ZZT) reflects low AC voltage variation under load transients.
The device exhibits a temperature coefficient of approximately +30 mV/°C near 39 V (per Fig. 3), requiring thermal-aware layout in high-precision references. Its SOD323F package enables automated placement and delivers 250 °C/W junction-to-ambient thermal resistance when mounted on a 10 mm × 10 mm FR-4 pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 36.0–37.85 V @ IZT = 5 mA - defines regulated output range for feedback networks |
| Power Dissipation (PD) | 500 mW on FR-4 - sets maximum continuous power handling without derating below 25°C |
| Zener Impedance (ZZT) | 85 Ω @ f = 1 kHz - determines AC ripple rejection capability in reference paths |
| Reverse Leakage (IR) | 0.2 µA @ VR = 30 V - ensures minimal error current in high-impedance bias networks |
| Thermal Resistance (RθJA) | 250 °C/W - informs board-level thermal design for ambient operation up to +150°C |
| Operating Temperature | −65 to +150 °C - supports under-hood automotive and industrial environments |
| Package | SOD323F - surface-mount, lead-free, halogen-free, moisture sensitivity Level 1 |
Pinout & Package
Package: SOD323F - ultra-small plastic surface-mount package with cathode band marking; dimensions: 1.25 mm × 1.70 mm × 0.75 mm (L × W × H); weight ≈ 0.004 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system ground or feedback divider low-side; establishes reference potential |
| Cathode | Regulated voltage node | Connected to feedback divider high-side or error amplifier input; supplies stable VZ |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage tolerance | ±2.5% over 36.0–37.85 V range - reduces calibration overhead in closed-loop power supplies |
| Low dynamic impedance | 85 Ω at 1 kHz - minimizes output voltage deviation during transient load changes |
| Automated assembly compatibility | SOD323F footprint with matte tin annealed terminals - ensures reliable reflow soldering and IPC-A-610 compliance |
| Environmental compliance | RoHS 3 (2015/863/EU), halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb) - meets automotive Tier-1 material declarations |
| Thermal performance | 250 °C/W RθJA on standard FR-4 - enables operation at full power up to +85°C ambient without heatsinking |
Applications
| Automotive DC-DC Converter Reference | Industrial PLC Power Supply Monitor |
|---|---|
|
Use Scenario: Regulating 12 V to 5 V buck converter output in engine control unit (ECU) power rail. IC Role / Device Role / Timing Role: Zener reference for TL431-based feedback network, setting precise output voltage threshold. Use Value: ±2.5% VZ tolerance eliminates need for post-production trimming; 0.2 µA leakage prevents bias error in high-resistance divider. |
Use Scenario: Monitoring 24 V field bus voltage in programmable logic controller backplane. IC Role / Device Role / Timing Role: Overvoltage clamp and reference element in discrete comparator circuit detecting >28 V fault condition. Use Value: 500 mW rating sustains clamping during sustained overvoltage events; SOD323F size fits dense I/O module layouts. |
| Medical Sensor Signal Conditioning | Telecom PoE Midspan Voltage Reference |
|
Use Scenario: Providing stable 3.3 V reference for analog front-end ADC in portable patient monitor. IC Role / Device Role / Timing Role: Precision shunt reference replacing higher-cost bandgap ICs in low-power signal chain. Use Value: 85 Ω ZZT ensures <1 mV ripple contribution at 10 kHz switching noise frequencies; −65°C to +150°C rating covers sterilization cycles. |
Use Scenario: Setting 57 V detection threshold in IEEE 802.3af/at midspan PSE controller. IC Role / Device Role / Timing Role: Zener-based overvoltage protection trigger in secondary-side sensing circuit. Use Value: Tight 36.0–37.85 V range allows accurate scaling via resistor divider to match PoE specification thresholds; RoHS 3 compliance satisfies telecom regulatory audits. |
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 | VZ = 37.0–41.0 V (±5%), ZZT = 130 Ω @ 5 mA, SOT-23 package | Higher VZ spread and impedance reduce accuracy in precision feedback | Select when cost priority outweighs regulation tightness; requires larger PCB area |
| MMSZ5267ET1G | VZ = 35.0–39.0 V (±5%), ZZT = 100 Ω @ 20 mA, SOD-123 package | Higher test current shifts operating point; 100 Ω impedance increases ripple sensitivity | Prefer for legacy designs using SOD-123 footprints; not suitable for low-current bias networks |
Compared with BZX84-C39LT1G and MMSZ5267ET1G, DDZ39CSF-7 delivers tighter voltage tolerance and lower dynamic impedance in a smaller, automotive-qualified package-making it optimal for new designs demanding high-accuracy, space-constrained voltage referencing.
Availability
DDZ39CSF-7 is available at Aetrix Electronics and suitable for automotive power management, industrial PLCs, medical sensor modules, and telecom PoE systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for DDZ39CSF-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 computing markets.
This part belongs to the DDZxx(x)SF precision Zener series, designed specifically for stable voltage reference and regulation in space-constrained, thermally demanding applications where tight VZ tolerance and low leakage are critical.
FAQ
What is the maximum continuous power dissipation for DDZ39CSF-7?
The DDZ39CSF-7 is rated for 500 mW power dissipation when mounted on a standard FR-4 PCB with a 10 mm × 10 mm copper pad. Derating begins linearly above +25°C ambient, reaching zero power at +150°C per the published derating curve (Fig. 1).
Does DDZ39CSF-7 meet automotive qualification standards?
DDZ39CSF-7 is manufactured in IATF 16949-certified facilities and supports PPAP documentation. While not pre-qualified to AEC-Q200 in this specific variant, its SOD323F construction, −65°C to +150°C operating range, and green material composition align with automotive change-control requirements.
How does the 85 Ω zener impedance affect circuit performance?
The 85 Ω dynamic impedance at 1 kHz means a 1 mA change in zener current produces ~85 mV change in output voltage. This directly impacts ripple rejection in feedback networks-lower ZZT improves stability in switch-mode power supplies with fast transient loads.
Can DDZ39CSF-7 be used in place of older DDZ39ASF or DDZ39BSF variants?
Yes-DDZ39CSF-7 replaces earlier ASF/BSF versions with improved VZ consistency (36.0–37.85 V vs. 34.68–36.47 V and 35.36–37.19 V) and identical SOD323F packaging, pinout, and thermal characteristics, enabling drop-in upgrades in existing designs requiring tighter regulation.
DDZ39CSF-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):
- 36.93 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
DDZ39CSF-7 FAQ
1.How can I place an order for DDZ39CSF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ39CSF-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 DDZ39CSF-7 reliable?
The price and inventory of DDZ39CSF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ39CSF-7 is usually 5 days.
3.What payment methods are accepted for DDZ39CSF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ39CSF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ39CSF-7?
DDZ39CSF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ39CSF-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 DDZ39CSF-7?
For technical support, including DDZ39CSF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ39CSF-7 requirements.
6.How does Aetrix verify that DDZ39CSF-7 is sourced from the original manufacturer or authorized distributors?
All DDZ39CSF-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 DDZ39CSF-7 meets industry standards.
7.What is the process for return or replacement of DDZ39CSF-7?
All DDZ39CSF-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ39CSF-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 DDZ39CSF-7 part is unused and in its original packaging.
Return procedure for DDZ39CSF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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