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Diodes Incorporated DDZX36-7
- Part No.:
- DDZX36-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
DDZX36-7.pdf
- Description:
- DIODE ZENER 36.9V 300MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,180
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Product details
Overview
DDZX36-7 from Diodes Incorporated is a surface-mount precision Zener diode in SOT23 package, rated for 300 mW power dissipation on FR-4 PCB, with nominal Zener voltage 36 V (min 35.36 V, max 37.19 V at IZT = 5 mA), Zener impedance 85 Ω at 5 mA, and reverse leakage ≤0.05 μA at 30 V. It is AEC-Q101 qualified and used for voltage regulation and reference in automotive and industrial power supply rails.
For engineers reviewing the DDZX36-7 datasheet, DDZX36-7 pinout, DDZX36-7 application, or DDZX36-7 equivalent, this page delivers verified electrical parameters, thermal derating behavior, temperature coefficient (±0.06 %/°C typical), packaging details, and direct alternatives for stable voltage reference design.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage across load variations by conducting reverse current above its precise breakdown threshold. Its sharp knee characteristics and low dynamic impedance ensure minimal voltage drift under varying current conditions.
The Zener exhibits a positive temperature coefficient of +0.06 %/°C near 36 V, consistent with medium-voltage Zener behavior, and is optimized for operation at 5 mA test current to balance stability and power efficiency. Thermal resistance is 417 °C/W junction-to-ambient on standard FR-4 layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 35.36–37.19 V at IZT = 5 mA - defines tight regulation window for 36 V reference applications |
| Zener Impedance (ZZT) | 85 Ω at 5 mA - ensures <±0.43 V output shift per ±10 mA load change |
| Power Dissipation (PD) | 300 mW on FR-4 PCB - supports continuous operation up to ~8.3 mA at 36 V without heatsinking |
| Reverse Leakage (IR) | ≤0.05 μA at VR = 30 V - enables ultra-low standby current in battery-backed circuits |
| Thermal Resistance (RθJA) | 417 °C/W - requires ambient ≤+125 °C for safe 300 mW operation on standard layout |
| Temperature Coefficient | +0.06 %/°C - contributes ~±21.6 mV/°C drift over –40°C to +125°C operating range |
| Package | SOT23 - 3-pin surface-mount footprint compatible with automated pick-and-place and reflow |
Pinout & Package
SOT23 package: 3-terminal plastic molded case, 0.008 g weight, matte tin-plated Alloy 42 leadframe, UL 94V-0 rated, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground | Connected to system ground when used as shunt regulator; establishes polarity for reverse-bias operation |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Connected to input rail via series resistor; supplies stable 36 V reference to load or feedback network |
| No-connect (Pin 3) | Unused internal leadframe tie-bar | Electrically isolated; must not be soldered or connected to avoid mechanical stress or shorting risk |
Key Features
| Feature | Design Value |
|---|---|
| Very tight VZ tolerance | ±2.5% at 36 V - reduces need for post-production trimming in precision references |
| AEC-Q101 qualification | Validated for automotive-grade reliability - supports use in engine control, body electronics, and ADAS power domains |
| Low leakage current | 0.05 μA @ 30 V - enables >10-year battery life in always-on monitoring circuits |
| Sharp breakdown knee | Dynamic impedance <85 Ω - maintains regulation accuracy even with fast transient load steps |
| Lead-free & halogen-free | RoHS 2 compliant, <900 ppm Br/Cl, <1000 ppm Sb - meets global environmental compliance mandates |
Applications
| Automotive Power Rail Monitoring | Industrial Sensor Reference Supply |
|---|---|
Use Scenario: Monitoring 36 V battery systems in commercial vehicle telematics modules. IC Role / Device Role / Timing Role: Shunt voltage reference for ADC input scaling and overvoltage detection circuitry. Use Value: Tight 36 V tolerance enables ±0.9 V absolute measurement accuracy without calibration. |
Use Scenario: Providing stable excitation voltage to 4–20 mA current-loop pressure transducers in factory automation. IC Role / Device Role / Timing Role: Precision Zener reference for op-amp-based current source biasing. Use Value: Low 85 Ω impedance minimizes output voltage shift under sensor load variation (±2 mA). |
| Programmable Logic Controller (PLC) Input Protection | Medical Diagnostic Equipment Power Supervision |
Use Scenario: Clamping transient surges on 24–48 V DC input channels of modular PLC backplanes. IC Role / Device Role / Timing Role: Overvoltage protection element in front-end interface stage. Use Value: 300 mW rating sustains 100 ms surge events without degradation, per IEC 61000-4-4 Level 3. |
Use Scenario: Regulating auxiliary 36 V rail for analog front-end amplifiers in portable ultrasound units. IC Role / Device Role / Timing Role: Low-noise voltage reference for high-resolution signal conditioning. Use Value: 0.05 μA leakage prevents measurable offset drift in microamp-level bias networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C36-7-F | Wider VZ tolerance (±5%), higher ZZT (100 Ω), same SOT23 package | Lower cost but reduced accuracy; suitable for non-critical regulation where ±1.8 V error is acceptable | Select when budget constraints outweigh precision requirements and thermal derating margin is sufficient |
| MMSZ5245B-7-F | VZ = 36 V ±5%, PD = 350 mW, RθJA = 357 °C/W, no AEC-Q101 qualification | Higher power handling but unqualified for automotive; better thermal performance on same PCB | Prefer for industrial power supplies requiring extended thermal headroom but no automotive certification |
Compared with DDZX36-7, BZX84-C36-7-F trades precision for cost, while MMSZ5245B-7-F offers higher power margin but lacks automotive qualification-making DDZX36-7 optimal for AEC-Q101–mandated 36 V reference designs demanding both accuracy and reliability.
Availability
DDZX36-7 is available at Aetrix Electronics and suitable for automotive power monitoring, industrial sensor excitation, and medical equipment power supervision requiring stable component supply and long-term lifecycle support.
Supply support for DDZX36-7 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 centers across Asia and manufacturing in China and Malaysia.
DDZX36-7 belongs to the DDZX series of precision Zener diodes engineered for high-reliability voltage reference and regulation in automotive, industrial, and medical applications where tight tolerance and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum continuous Zener current for DDZX36-7 at +25°C?
The maximum continuous Zener current is calculated from PD = 300 mW and VZ ≈ 36 V, yielding ~8.3 mA. Derating begins above +25°C per Fig. 1, reaching ~5.5 mA at +85°C ambient on standard FR-4 layout.
Is DDZX36-7 suitable for use in a 36 V switching power supply feedback loop?
Yes - its 85 Ω Zener impedance and sharp breakdown enable stable feedback voltage generation for TL431-based or optocoupler-coupled regulators, provided series resistor limits peak current to ≤8.3 mA and thermal layout supports dissipation.
Does DDZX36-7 have a specified capacitance value?
No specific capacitance is listed in DS30408 Rev. 13–2. Figure 10 shows total capacitance <2 pF for 36 V Zeners at VR = 1 V, f = 1 MHz, indicating suitability for low-noise analog reference applications without high-frequency coupling concerns.
Can DDZX36-7 replace DDZX36 in an existing design?
Yes - the "-7" suffix denotes 3,000-piece tape-and-reel packaging; electrically and thermally identical to bare DDZX36. Pinout, marking, and all specifications match exactly - only packaging differs.
DDZX36-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 36.9 V
- Tolerance:
- ±3%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 85 Ohms
- Current - Reverse Leakage @ Vr:
- 50 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:
- SOT-23-3
DDZX36-7 FAQ
1.How can I place an order for DDZX36-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZX36-7 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 DDZX36-7 reliable?
The price and inventory of DDZX36-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZX36-7 is usually 5 days.
3.What payment methods are accepted for DDZX36-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZX36-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZX36-7?
DDZX36-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZX36-7 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 DDZX36-7?
For technical support, including DDZX36-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZX36-7 requirements.
6.How does Aetrix verify that DDZX36-7 is sourced from the original manufacturer or authorized distributors?
All DDZX36-7 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 DDZX36-7 meets industry standards.
7.What is the process for return or replacement of DDZX36-7?
All DDZX36-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZX36-7, 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 DDZX36-7 part is unused and in its original packaging.
Return procedure for DDZX36-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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