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Diodes Incorporated DDZ34-7
- Part No.:
- DDZ34-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
DDZ34-7.pdf
- Description:
- DIODE ZENER 34V 470MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:7,898
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Product details
Overview
DDZ34-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal zener voltage 33.79–34.49 V at 5 mA test current, ±2.2% tolerance, 75 Ω dynamic impedance at 5 mA, and 0.05 µA maximum reverse leakage at 27 V. It operates across –65°C to +150°C and delivers stable voltage reference in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the DDZ34-7 datasheet, DDZ34-7 pinout, DDZ34-7 application, or DDZ34-7 equivalent, key selection criteria include zener voltage tightness (±2.2%), low temperature coefficient (~+0.08%/°C), SOD123 package thermal resistance (425°C/W on minimal pad), and automotive-grade availability via Q-suffix variants.
Technical Context
This Zener diode uses silicon planar epitaxial construction to achieve precise breakdown voltage control and low dynamic impedance. Its voltage regulation is optimized for DC biasing and reference applications where stability under varying load and temperature is critical.
The device exhibits a positive temperature coefficient of approximately +0.08%/°C in the 33–35 V range, enabling predictable drift behavior in closed-loop feedback networks. It is rated for 294 mW power dissipation on standard FR-4 PCB with minimal copper pad layout per JESD51-3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 32.79–34.49 V at IZT = 5 mA - defines stable regulation window for feedback sensing |
| Zener Impedance (ZZT) | 75 Ω at IZT = 5 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | 0.05 µA at VR = 27 V - enables low-power standby operation without significant quiescent loss |
| Power Dissipation (PD) | 294 mW at TA = +25°C on minimal pad - sets max continuous bias current limit (~8.5 mA at 34 V) |
| Temp. Coefficient (TCVZ) | +0.08%/°C typical - allows predictable compensation in temperature-sensitive references |
| Package | SOD123 - surface-mount footprint compatible with automated placement and reflow (JEDEC MS-012) |
| Operating Temp. | –65°C to +150°C - supports industrial and under-hood automotive environments |
Pinout & Package
DDZ34-7 is housed in a two-terminal SOD123 plastic package with cathode indicated by a band. The anode and cathode terminals are formed from matte tin-annealed Alloy 42 leadframe, solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Regulated output node | Connected to reference point in feedback network; voltage measured relative to anode |
| Anode | Return/reference ground | Typically tied to system ground or power rail return; establishes polarity for reverse-bias operation |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage tolerance | ±2.2% (32.79–34.49 V) - reduces need for external trimming in voltage reference designs |
| Low dynamic impedance | 75 Ω at 5 mA - maintains regulation accuracy during line/load transients in SMPS feedback |
| High-temperature operation | Rated to +150°C junction - suitable for engine-control modules and industrial motor drives |
| Lead-free & green compliance | Halogen- and antimony-free, RoHS 3 compliant - meets automotive and industrial environmental mandates |
| Automotive qualification option | DDZ34Q-7 variant AEC-Q101 qualified - supports PPAP and IATF16949 production requirements |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Zener reference providing stable threshold for TL431 or optocoupler LED biasing. Use Value: Tight 2.2% VZ tolerance minimizes output voltage deviation across production units without calibration. |
Use Scenario: Clamping input rail voltage to prevent damage to downstream LDOs or microcontrollers during surge events. IC Role / Device Role / Timing Role: Shunt element that conducts above 34 V to divert excess current and hold rail within safe limits. Use Value: Low 75 Ω ZZT ensures rapid clamping response and minimal overshoot before crowbar activation. |
| Industrial Sensor Signal Conditioning | Programmable Logic Controller (PLC) Input Protection |
Use Scenario: Providing stable excitation voltage for resistive bridge sensors (e.g., strain gauges) in harsh factory environments. IC Role / Device Role / Timing Role: Precision voltage reference source for ratiometric ADC biasing and offset nulling. Use Value: +0.08%/°C TCVZ enables predictable drift compensation in firmware or analog circuitry. |
Use Scenario: Protecting 24 V digital input channels against ESD and transient overvoltage in modular PLC backplanes. IC Role / Device Role / Timing Role: Primary shunt clamp limiting voltage seen by input buffer ICs during fast transients. Use Value: Rated for –65°C to +150°C operation ensures reliability in uncontrolled cabinet environments. |
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-C33-7-F | 33 V nominal, ±5% tolerance, 90 Ω ZZT, SOT-23 package | Higher voltage drift and looser tolerance; smaller footprint but lower power rating (300 mW) | Select when board space is constrained and ±5% regulation is acceptable |
| MMSZ5255B-7-F | 33 V nominal, ±5% tolerance, 100 Ω ZZT, SOD-123 package, same power rating | Looser tolerance and higher impedance reduce regulation accuracy in precision feedback paths | Prefer for cost-sensitive non-critical biasing where traceability and automotive qualification are not required |
Compared with DDZ34-7, BZX84-C33-7-F offers smaller size but sacrifices voltage accuracy and thermal robustness, while MMSZ5255B-7-F matches the package but lacks tight tolerance and low-impedance performance needed for high-stability references.
Availability
DDZ34-7 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, programmable logic controller inputs, and overvoltage protection circuits requiring stable component supply across extended temperature ranges.
Supply support for DDZ34-7 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 worldwide.
The DDZ series targets precision voltage reference and regulation applications in industrial, automotive, and computing systems, emphasizing tight tolerance, low impedance, and high-reliability packaging.
FAQ
What is the maximum continuous power dissipation for DDZ34-7 on a standard PCB?
DDZ34-7 is rated for 294 mW at +25°C ambient when mounted on an FR-4 board with minimal recommended pad layout (1× minimum copper area). Derating begins linearly above +25°C at 0.706 mW/°C, reaching zero at +150°C ambient.
Does DDZ34-7 have automotive-grade qualification?
The commercial-grade DDZ34-7 is not AEC-Q101 qualified, but its automotive counterpart DDZ34Q-7 is fully AEC-Q101 qualified, PPAP capable, and manufactured in IATF16949-certified facilities - identical in electrical specs and SOD123 packaging.
How is cathode polarity identified on the DDZ34-7 package?
The cathode is marked by a visible band printed on the body of the SOD123 package, aligned with the cathode terminal. This matches industry-standard marking convention and is verified in Diodes' package outline drawing DS30407 Rev. 21-2, page 7.
What is the typical temperature coefficient for DDZ34-7?
Per Figure 19 in DS30407, DDZ34-7 exhibits a typical temperature coefficient of +0.08%/°C across the 30–43 V range, indicating a predictable positive drift with rising temperature - useful for compensating negative-drift components in reference designs.
DDZ34-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 34 V
- Tolerance:
- ±3%
- 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
DDZ34-7 FAQ
1.How can I place an order for DDZ34-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ34-7 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 DDZ34-7 reliable?
The price and inventory of DDZ34-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ34-7 is usually 5 days.
3.What payment methods are accepted for DDZ34-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ34-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ34-7?
DDZ34-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ34-7 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 DDZ34-7?
For technical support, including DDZ34-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ34-7 requirements.
6.How does Aetrix verify that DDZ34-7 is sourced from the original manufacturer or authorized distributors?
All DDZ34-7 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 DDZ34-7 meets industry standards.
7.What is the process for return or replacement of DDZ34-7?
All DDZ34-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ34-7, 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 DDZ34-7 part is unused and in its original packaging.
Return procedure for DDZ34-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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