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Diodes Incorporated DDZ33-7
- Part No.:
- DDZ33-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
DDZ33-7.pdf
- Description:
- DIODE ZENER 33V 470MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:2,700
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Product details
Overview
DDZ33-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal zener voltage 32.14–33.79 V at 5 mA test current, ±3% tolerance, 75 Ω dynamic impedance at 5 mA, and 0.05 µA reverse leakage at 27 V. It operates in SOD123 package, delivers stable voltage reference for power supply regulation and overvoltage protection in industrial power converters.
For engineers reviewing the DDZ33-7 datasheet, DDZ33-7 pinout, DDZ33-7 application, or DDZ33-7 equivalent, key selection criteria include zener voltage tightness (±3%), low temperature coefficient (≈+0.08%/°C), thermal resistance (425 °C/W on minimal pad), and automotive-grade variants (DDZ33Q-7) for AEC-Q101-compliant designs.
Technical Context
This Zener diode uses silicon planar construction to achieve precise breakdown voltage control via controlled doping and geometry. Its low dynamic impedance (75 Ω @ 5 mA) ensures minimal output voltage variation under load transients, critical for feedback loop stability in switching regulators.
The device exhibits positive temperature coefficient (~+0.08%/°C) above ~20 V, enabling predictable drift compensation in multi-diode reference strings. Its SOD123 package supports automated placement and reflow soldering while maintaining thermal performance up to +150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 32.14–33.79 V @ IZT = 5 mA - defines stable regulation point for 27–33 V input rails |
| Zener Impedance (ZZT) | 75 Ω @ 5 mA - limits output voltage shift to ≤375 mV under ±5 mA load change |
| Reverse Leakage (IR) | 0.05 µA @ VR = 27 V - ensures negligible error current in high-impedance reference paths |
| Power Dissipation | 294 mW @ TA = +25°C (min pad layout) - sets max continuous current to ~8.8 mA at 33 V |
| Thermal Resistance (RθJA) | 425 °C/W - requires derating to 180 mW at +75°C ambient in standard PCB layout |
| Temperature Coefficient | +0.08%/°C - enables predictable +26.4 mV/°C drift across 33 V nominal, usable in temp-compensated refs |
Pinout & Package
Package: SOD123 - surface-mount plastic case with cathode band marking; dimensions: 2.65 mm × 1.55 mm × 1.05 mm (L × W × H); moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference return | Connected to circuit ground or lower-potential node; establishes reference node for voltage sensing |
| Cathode | Zener breakdown terminal / regulated output | Supplies stable 33 V output when reverse-biased; marked by visible band on package body |
Key Features
| Feature | Design Value |
|---|---|
| Tight VZ tolerance | ±3% (32.14–33.79 V range) - reduces need for post-production trimming in voltage reference circuits |
| Low dynamic impedance | 75 Ω @ 5 mA - maintains regulation accuracy under varying load conditions in feedback networks |
| Automated assembly compatibility | SOD123 footprint with matte tin finish - ensures reliable solder wetting and placement yield in SMT lines |
| Green material compliance | Halogen- and antimony-free molding compound (<900 ppm Br/Cl, <1000 ppm Sb) - meets IPC-1752A environmental requirements |
Applications
| Industrial Power Supply Regulation | Overvoltage Protection Clamp |
|---|---|
|
Use Scenario: Secondary-side voltage reference in isolated DC-DC converters delivering 24 V output. IC Role / Device Role / Timing Role: Zener diode provides precise 33 V reference for TL431 shunt regulator feedback divider. Use Value: ±3% VZ tolerance eliminates need for resistor trimming, reducing BOM count and calibration time. |
Use Scenario: Input rail clamp protecting 30 V-rated DC motor driver ICs from surge events. IC Role / Device Role / Timing Role: Reverse-biased DDZ33-7 clamps transient spikes above 33.8 V to safe levels before reaching gate drivers. Use Value: 75 Ω ZZT ensures clamp voltage stays within 2.5 V of nominal during 100 mA surge, preventing latch-up. |
| Programmable Logic Controller (PLC) Analog Input Protection | Test Equipment Reference Calibration |
|
Use Scenario: Front-end overvoltage guard for ±10 V analog input channels exposed to field wiring faults. IC Role / Device Role / Timing Role: Paired with series resistor to limit fault current while clamping to 33 V, protecting ADC front-end op-amps. Use Value: 0.05 µA leakage at 27 V avoids loading high-impedance sensor inputs, preserving measurement accuracy. |
Use Scenario: Stable voltage reference in portable multimeter calibration circuitry requiring traceable 33 V point. IC Role / Device Role / Timing Role: Used in temperature-compensated Zener stack to generate low-drift 33 V reference for DAC offset correction. Use Value: +0.08%/°C TC allows predictable drift modeling across –40°C to +85°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C33-7-F | Wider VZ tolerance (±5%), higher ZZT (90 Ω), same SOD123 package | Acceptable where ±5% regulation is sufficient; less suitable for high-accuracy feedback loops | Select when cost sensitivity outweighs voltage precision; verify loop stability with higher impedance |
| MMSZ5260ET1G | VZ = 33 V ±5%, ZZT = 50 Ω @ 20 mA, but rated only at 500 mW peak pulse (not continuous) | Designed for transient suppression, not continuous regulation; unsuitable for steady-state reference use | Use only for short-duration clamping; avoid in linear regulator or feedback reference roles |
Compared with BZX84-C33-7-F and MMSZ5260ET1G, DDZ33-7 offers tighter voltage tolerance and verified continuous-power capability, making it preferable for precision regulation where long-term stability and low drift are required.
Availability
DDZ33-7 is available at Aetrix Electronics and suitable for industrial power supplies, programmable logic controllers, test equipment calibration, and overvoltage protection circuits requiring stable component supply and RoHS-compliant sourcing.
Supply support for DDZ33-7 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, manufacturing, and sales operations across Asia, Europe, and North America.
The DDZ series belongs to Diodes' precision Zener diode product line, engineered specifically for high-accuracy voltage reference and regulation in space-constrained, high-reliability applications including industrial automation and automotive subsystems.
FAQ
What is the maximum continuous power dissipation for DDZ33-7 on a standard FR-4 PCB?
DDZ33-7 dissipates up to 294 mW continuously at +25°C ambient when mounted on an FR-4 board with minimal recommended pad layout (1× pad area). Derating follows a linear curve: power drops to 180 mW at +75°C ambient, based on RθJA = 425 °C/W.
Does DDZ33-7 have automotive qualification?
Yes - the automotive-grade variant is DDZ33Q-7, qualified to AEC-Q101, PPAP-capable, and manufactured in IATF16949-certified facilities. The standard DDZ33-7 is commercial-grade and not AEC-Q101 certified.
How is polarity identified on the DDZ33-7 SOD123 package?
Polarity is marked by a cathode band - a visible molded stripe near one end of the SOD123 body. The terminal adjacent to the band is the cathode; the opposite end is the anode. This matches standard diode marking convention and aligns with JEDEC SOD123 mechanical drawings.
Can DDZ33-7 replace a 33 V Zener with different package like DO-35?
No - DDZ33-7 is SOD123-only and not a drop-in replacement for axial DO-35 devices. Mechanical dimensions, thermal path, and solder profile differ significantly. Board redesign is required to accommodate SOD123 footprint, pad layout, and reflow profile.
DDZ33-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±2.5%
- Power - Max:
- 470 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:
- SOD-123
DDZ33-7 FAQ
1.How can I place an order for DDZ33-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ33-7 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 DDZ33-7 reliable?
The price and inventory of DDZ33-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ33-7 is usually 5 days.
3.What payment methods are accepted for DDZ33-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ33-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ33-7?
DDZ33-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ33-7 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 DDZ33-7?
For technical support, including DDZ33-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ33-7 requirements.
6.How does Aetrix verify that DDZ33-7 is sourced from the original manufacturer or authorized distributors?
All DDZ33-7 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 DDZ33-7 meets industry standards.
7.What is the process for return or replacement of DDZ33-7?
All DDZ33-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ33-7, 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 DDZ33-7 part is unused and in its original packaging.
Return procedure for DDZ33-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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