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Diodes Incorporated DDZX33-13
- Part No.:
- DDZX33-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
DDZX33-13.pdf
- Description:
- DIODE ZENER 33V 300MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,837
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Product details
Overview
DDZX33-13 from Diodes Incorporated is a surface-mount precision Zener diode in SOT23 package, rated for 33 V nominal zener voltage (32.14–33.79 V at 5 mA), 300 mW power dissipation on FR-4 PCB, and 75 Ω zener impedance at test current - used for voltage regulation and reference in automotive and industrial power supply rails.
For engineers reviewing the DDZX33-13 datasheet, DDZX33-13 pinout, DDZX33-13 application, or DDZX33-13 equivalent, this part is selected for stable low-leakage (<0.05 µA at 27 V), tight-tolerance (±2.5% VZ) voltage reference in space-constrained, AEC-Q101-compliant designs requiring sharp breakdown and low thermal drift.
Technical Context
This device operates as a two-terminal shunt regulator with precisely controlled reverse-breakdown behavior. Its 33 V nominal zener voltage is specified at IZT = 5 mA, with maximum zener impedance of 75 Ω at that current and 250 Ω at knee current (IZK = 0.5 mA), ensuring predictable regulation across load transients.
Designed for high-reliability environments, it meets AEC-Q101 stress-test requirements and features <0.05 µA reverse leakage at 27 V, low temperature coefficient (≈+0.08 %/°C near 33 V), and halogen/antimony-free "Green" construction compliant with RoHS 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 32.14–33.79 V at IZT = 5 mA - defines precise regulation point for feedback loops and reference circuits |
| Power Dissipation (PD) | 300 mW on FR-4 PCB - sets maximum continuous power handling without derating below +25°C ambient |
| Zener Impedance (ZZT) | 75 Ω at IZT = 5 mA - determines output voltage stability under varying load current |
| Reverse Leakage (IR) | ≤0.05 µA at VR = 27 V - ensures minimal error current in high-impedance reference paths |
| Thermal Resistance (RθJA) | 417 °C/W - quantifies junction-to-ambient temperature rise per watt, critical for thermal design on standard PCBs |
| Operating Temperature | −65 to +150 °C - supports extended-range operation in under-hood automotive and industrial environments |
Pinout & Package
Package: SOT23 - surface-mount plastic case with matte tin-annealed terminals, moisture sensitivity level 1, weight ≈0.008 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground | Connected to system ground or lower-potential node when used in shunt regulation |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Provides stable 33 V reference relative to anode; carries full zener current in regulation mode |
| NC / Heat Sink (Pin 3) | Non-connected leadframe tab | Not electrically connected; serves mechanical anchoring and minor thermal conduction path in SOT23 layout |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTOL, TC, HAST, and ESD testing |
| Tight VZ tolerance | ±2.5% over 32.14–33.79 V range enables accurate closed-loop voltage control without trimming |
| Low leakage current | <0.05 µA at 27 V minimizes error in high-resistance divider networks and battery-backed references |
| Sharp breakdown knee | Defined 0.5 mA knee current (IZK) ensures stable turn-on behavior even at light loads |
| Lead-free & Green compliance | Halogen-free (<900 ppm Br/Cl, <1000 ppm Sb) and RoHS 2-compliant for eco-sensitive applications |
Applications
| Automotive Engine Control Unit (ECU) Power Monitoring | Industrial PLC Analog Input Reference |
|---|---|
|
Use Scenario: Monitoring 12 V battery rail integrity in engine control modules under wide temperature and ripple conditions. IC Role / Device Role / Timing Role: Shunt voltage reference for ADC input scaling and overvoltage detection circuitry. Use Value: Stable 33 V reference enables accurate ratio-metric measurement of 12 V rail via resistive divider, unaffected by leakage-induced offset. |
Use Scenario: Providing precision reference for 4–20 mA loop-powered analog input stages in programmable logic controllers. IC Role / Device Role / Timing Role: Two-terminal voltage clamp and calibration reference for op-amp-based signal conditioning. Use Value: Low 75 Ω zener impedance maintains reference accuracy despite current variations from loop transmitter loading. |
| Medical Infusion Pump Power Supervision | Telecom Base Station Bias Supply |
|
Use Scenario: Validating auxiliary 5 V/3.3 V DC-DC converter outputs in battery-operated infusion pumps with safety-critical monitoring. IC Role / Device Role / Timing Role: Overvoltage protection element and secondary reference for watchdog comparator thresholds. Use Value: AEC-Q101 qualification and −65 to +150 °C rating ensure functional safety compliance in medical-grade thermal cycling. |
Use Scenario: Stabilizing bias voltage for RF front-end amplifiers in outdoor telecom base stations exposed to solar heating. IC Role / Device Role / Timing Role: Temperature-compensated voltage reference for amplifier bias current setting. Use Value: +0.08 %/°C tempco minimizes drift-induced gain variation across −40 to +85 °C operating range. |
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-C33 (ON Semiconductor) | Same SOT23 package; wider VZ tolerance (±5%), higher ZZT (100 Ω), no AEC-Q101 qualification | Limited to commercial-grade consumer or non-safety-critical industrial use | Select when cost is primary constraint and automotive qualification is unnecessary |
| MMSZ5257ET1G (onsemi) | 33 V nominal, ±5% tolerance, 100 Ω ZZT, 500 mW PD, but only qualified to JESD22 standards (not AEC-Q101) | Suitable for general-purpose regulation where thermal margin >300 mW is required | Choose if higher power headroom is needed and automotive reliability is not mandated |
Compared with BZX84-C33 and MMSZ5257ET1G, DDZX33-13 delivers tighter voltage tolerance, lower dynamic impedance, and certified AEC-Q101 reliability - making it the preferred choice for automotive and mission-critical industrial voltage reference applications where long-term stability and stress resilience are mandatory.
Availability
DDZX33-13 is available at Aetrix Electronics and suitable for automotive ECU power monitoring, industrial PLC analog input reference, and medical infusion pump power supervision requiring stable component supply across extended temperature and lifecycle demands.
Supply support for DDZX33-13 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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with manufacturing and test facilities across Asia and design centers in the US, UK, and Taiwan.
This part belongs to the DDZX series of precision Zener diodes - engineered specifically for high-stability voltage reference and regulation in automotive, industrial, and medical systems demanding AEC-Q101 reliability and tight parametric control.
FAQ
What is the maximum continuous power dissipation for DDZX33-13 on standard FR-4 PCB?
The DDZX33-13 is rated for 300 mW power dissipation when mounted on FR-4 PCB using Diodes Incorporated's recommended pad layout. Derating begins above +25°C ambient, following the curve in Figure 1 of DS30408 Rev. 13–2, reaching zero dissipation at +150°C.
Does DDZX33-13 have automotive qualification?
Yes - DDZX33-13 is qualified to AEC-Q101 standards for high-reliability automotive applications. It undergoes stress testing including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing per the AEC specification.
What is the zener voltage tolerance and test condition for DDZX33-13?
The zener voltage is guaranteed between 32.14 V and 33.79 V (±2.5%) when measured at IZT = 5 mA, TA = +25°C, with pulse duration <40 ms to minimize self-heating effects, per Note 8 in the datasheet.
How does the temperature coefficient behave near 33 V nominal zener voltage?
Per Figure 19 of DS30408 Rev. 13–2, the temperature coefficient of VZ for DDZX33-13 is approximately +0.08 %/°C, indicating a positive, linear drift with rising temperature - typical for Zeners in the 30–40 V range and enabling predictable compensation in reference designs.
DDZX33-13 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):
- 33 V
- Tolerance:
- ±3%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 75 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27 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
DDZX33-13 FAQ
1.How can I place an order for DDZX33-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZX33-13 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 DDZX33-13 reliable?
The price and inventory of DDZX33-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZX33-13 is usually 5 days.
3.What payment methods are accepted for DDZX33-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZX33-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZX33-13?
DDZX33-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZX33-13 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 DDZX33-13?
For technical support, including DDZX33-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZX33-13 requirements.
6.How does Aetrix verify that DDZX33-13 is sourced from the original manufacturer or authorized distributors?
All DDZX33-13 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 DDZX33-13 meets industry standards.
7.What is the process for return or replacement of DDZX33-13?
All DDZX33-13 units undergo pre-shipment inspection (PSI). If there is an issue with DDZX33-13, 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 DDZX33-13 part is unused and in its original packaging.
Return procedure for DDZX33-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DDZX33-13 Tags
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