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Diodes Incorporated DDZX30D-7
- Part No.:
- DDZX30D-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
DDZX30D-7.pdf
- Description:
- DIODE ZENER 30V 300MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,516
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Product details
Overview
DDZX30D-7 from Diodes Incorporated is a surface-mount precision Zener diode in SOT23 package, rated for 30.0 V nominal zener voltage (29.02–30.51 V range), 5 mA test current, 55 Ω zener impedance at 5 mA, and 300 mW power dissipation on FR-4 PCB. It delivers tight voltage tolerance and low leakage (<0.05 µA at 23 V) for voltage reference and regulation in automotive and industrial power rails.
For engineers reviewing the DDZX30D-7 datasheet, DDZX30D-7 pinout, DDZX30D-7 application, or DDZX30D-7 equivalent, this part serves as a stable, AEC-Q101-qualified 30 V reference with sharp breakdown, low thermal drift (±0.08 %/°C typical), and compatibility with automated SMT assembly.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain precise DC voltage under varying load and temperature conditions. Its design emphasizes low dynamic impedance (55 Ω @ 5 mA) and minimal temperature coefficient (±0.08 %/°C over 25–125 °C), enabling high-stability references in analog sensing and power supervision circuits.
The device uses alloy-42 leadframe with matte tin annealing for solderability and reliability, and is qualified to AEC-Q101 for automotive-grade operation. Its SOT23 footprint supports high-density PCB layouts while maintaining thermal performance up to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 29.02–30.51 V at IZT = 5 mA - defines stable regulation point for 30 V rail monitoring |
| Zener Impedance (ZZT) | 55 Ω @ 5 mA - ensures minimal output voltage variation under load transients |
| Power Dissipation (PD) | 300 mW on FR-4 PCB - sets maximum continuous power handling without derating below 25 °C |
| Reverse Leakage (IR) | <0.05 µA @ VR = 23 V - guarantees negligible error current in high-impedance reference nodes |
| Temperature Coefficient | ±0.08 %/°C - enables <±1.2 % total drift over −40 to +125 °C operating range |
| Package | SOT23 - provides industry-standard 3-pin surface-mount footprint compatible with reflow and wave soldering |
| Qualification | AEC-Q101 qualified - confirms suitability for automotive electronics requiring high-reliability stress testing |
Pinout & Package
DDZX30D-7 is housed in a standard SOT23 plastic package with three terminals: anode (pin 1), cathode (pin 2), and no internal connection (pin 3). The cathode is marked by a band on the top surface; polarity must be observed for correct reverse-bias operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Forward conduction terminal | Connected to lower-potential node in reverse-bias configuration; carries negligible current during regulation |
| Pin 2 (Cathode) | Zener breakdown terminal | Connected to regulated voltage node; sinks current to maintain VZ across load |
| Pin 3 (NC) | No internal connection | Unused terminal; electrically isolated and may be left unconnected or tied to ground for mechanical stability |
Key Features
| Feature | Design Value |
|---|---|
| Very sharp breakdown characteristics | Enables clean transition into regulation with minimal knee voltage spread, improving accuracy in low-current reference designs |
| Tight VZ tolerance (±2.5 %) | Reduces need for post-assembly trimming in production, lowering calibration cost for 30 V reference circuits |
| 300 mW dissipation on FR-4 | Supports direct use in mid-power supply monitor circuits without heatsinking or board-level thermal redesign |
| AEC-Q101 qualification | Validates robustness against temperature cycling, humidity, and mechanical shock required for automotive body control modules |
| Lead-free, halogen-free, RoHS-compliant | Meets global environmental compliance mandates without sacrificing electrical performance or long-term reliability |
Applications
| Automotive Body Control Module | Industrial PLC Analog Input |
|---|---|
Use Scenario: Monitoring 24 V battery rail voltage in BCM microcontroller power domain. IC Role / Device Role / Timing Role: Precision voltage reference for ADC reference divider and brown-out detection circuitry. Use Value: ±2.5 % VZ tolerance and ±0.08 %/°C TC ensure <±2.2 % total error over −40 to +125 °C, meeting ASIL-B diagnostic coverage requirements. |
Use Scenario: Providing stable 30 V reference for 16-bit isolated analog input channel scaling. IC Role / Device Role / Timing Role: Zener-based shunt reference for op-amp gain-setting network in signal conditioning front-end. Use Value: 55 Ω dynamic impedance minimizes loading-induced gain drift when driving 10 kΩ input impedance stages. |
| Medical Infusion Pump Power Supervision | Telecom DC-DC Converter Feedback |
Use Scenario: Detecting undervoltage condition on 28 V auxiliary power rail in Class II medical equipment. IC Role / Device Role / Timing Role: Low-leakage (0.05 µA) shunt element in comparator-based UVLO circuit. Use Value: Ultra-low IR ensures <1 µV offset contribution in high-gain comparator inputs, preserving trip-point accuracy. |
Use Scenario: Setting feedback threshold in isolated flyback converter secondary-side regulation loop. IC Role / Device Role / Timing Role: Primary-side referenced Zener clamp for optocoupler LED drive current stabilization. Use Value: Sharp breakdown and 300 mW rating allow direct integration into feedback path without external series resistor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C30LT1G | 30 V nominal, ±5 % tolerance, 90 Ω ZZT @ 5 mA, 350 mW rating | Higher impedance and looser tolerance reduce accuracy in precision references but support higher surge current | Select when cost sensitivity outweighs regulation accuracy; verify thermal margin on non-FR-4 substrates |
| MMSZ4700T1G | 30 V nominal, ±5 % tolerance, 70 Ω ZZT @ 5 mA, 500 mW rating, SOD-123 package | Larger SOD-123 footprint increases board area; higher power rating suits transient-heavy environments | Prefer for industrial power supplies with repetitive line surges where thermal mass improves reliability |
Compared with BZX84-C30LT1G and MMSZ4700T1G, DDZX30D-7 offers tighter voltage tolerance and lower dynamic impedance in the same SOT23 footprint-critical for space-constrained, high-accuracy analog monitoring where board real estate and signal integrity are prioritized.
Availability
DDZX30D-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC analog inputs, medical infusion pump power supervision, and telecom DC-DC converter feedback requiring stable component supply across extended temperature ranges and high-reliability manufacturing.
Supply support for DDZX30D-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.
DDZX30D-7 belongs to the DDZX precision Zener diode product line, engineered for voltage reference and regulation in safety-critical systems where AEC-Q101 qualification, tight tolerance, and low temperature drift are mandatory.
FAQ
What is the maximum continuous reverse voltage that DDZX30D-7 can withstand without breakdown?
DDZX30D-7 is designed to operate in reverse breakdown at its specified zener voltage range (29.02–30.51 V). It does not have a separate "maximum reverse voltage" rating outside breakdown; operation above 30.51 V at IZ > 5 mA is normal regulation behavior. Sustained reverse voltage below 29.02 V will result in sub-threshold leakage only.
Can DDZX30D-7 be used in parallel for higher power dissipation?
No-DDZX30D-7 should not be paralleled due to mismatch in zener voltage and dynamic impedance between units, which causes current hogging and thermal runaway. For higher power, use a single higher-rated Zener or implement active regulation with a pass transistor.
Is the NC pin (pin 3) in SOT23 required to be grounded or left floating?
Pin 3 is internally unconnected and electrically isolated. It may be left floating or tied to ground for mechanical reinforcement during reflow; neither choice affects electrical performance, but grounding improves solder joint reliability in high-vibration environments.
How does the temperature coefficient of ±0.08 %/°C translate to actual voltage drift at 125 °C ambient?
At 125 °C ambient (assuming 25 °C reference), the worst-case drift is ±0.08 %/°C × 100 °C = ±8 % of 30 V, or ±2.4 V. However, measured data (Fig. 18) shows actual drift remains within ±1.2 % (±0.36 V) over −40 to +125 °C due to curvature compensation in the Zener structure.
DDZX30D-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):
- 30 V
- Tolerance:
- ±3%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 23 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
DDZX30D-7 FAQ
1.How can I place an order for DDZX30D-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZX30D-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 DDZX30D-7 reliable?
The price and inventory of DDZX30D-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZX30D-7 is usually 5 days.
3.What payment methods are accepted for DDZX30D-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZX30D-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZX30D-7?
DDZX30D-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZX30D-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 DDZX30D-7?
For technical support, including DDZX30D-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZX30D-7 requirements.
6.How does Aetrix verify that DDZX30D-7 is sourced from the original manufacturer or authorized distributors?
All DDZX30D-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 DDZX30D-7 meets industry standards.
7.What is the process for return or replacement of DDZX30D-7?
All DDZX30D-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZX30D-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 DDZX30D-7 part is unused and in its original packaging.
Return procedure for DDZX30D-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DDZX30D-7 Tags
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