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Diodes Incorporated DDZ30DQ-7
- Part No.:
- DDZ30DQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
DDZ30DQ-7.pdf
- Description:
- DIODE ZENER 29.77V 470MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:4,748
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Product details
Overview
DDZ30DQ-7 from Diodes Incorporated is a precision Zener diode in SOD123 package, designed for voltage regulation and reference applications with tight 5% tolerance (29.02 V to 30.51 V nominal Zener voltage at 5 mA), low dynamic impedance (55 Ω at 5 mA), and low reverse leakage (0.05 µA at 23.0 V). It operates across –65°C to +150°C and is AEC-Q101 qualified for automotive power supply monitoring and ECU reference circuits.
For engineers reviewing the DDZ30DQ-7 datasheet, DDZ30DQ-7 pinout, DDZ30DQ-7 application, or DDZ30DQ-7 equivalent, this part serves as a stable, low-capacitance (≈1.5 pF) voltage reference in space-constrained, high-reliability designs requiring precise clamping or biasing under varying thermal conditions.
Technical Context
This Zener diode employs silicon planar construction with controlled avalanche breakdown for stable reverse-biased operation. Its 30 V nominal Zener voltage falls within the optimal range for low-temperature-coefficient performance (±0.08%/°C typical), minimizing drift over industrial and automotive temperature ranges.
The device delivers 470 mW power dissipation at 25°C ambient on standard FR-4 PCB layout and exhibits 425°C/W thermal resistance when mounted with minimum recommended pad area-enabling predictable thermal derating up to 125°C ambient without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 29.02 V to 30.51 V at IZT = 5 mA - defines precise clamping threshold for overvoltage protection and analog reference stability |
| Zener Impedance (ZZT) | 55 Ω at 5 mA - ensures minimal output voltage variation under load transients in feedback or sensing paths |
| Reverse Leakage (IR) | 0.05 µA at VR = 23.0 V - enables ultra-low standby current in battery-backed or energy-sensitive circuits |
| Power Dissipation (PD) | 470 mW at TA = +25°C - supports continuous regulation in compact layouts without heatsinking |
| Thermal Resistance (RθJA) | 425 °C/W (min pad layout) - allows accurate junction temperature estimation for reliability modeling |
| Operating Temperature | –65°C to +150°C - validated for under-hood automotive and industrial control environments |
| Package | SOD123 - surface-mount footprint (2.65 mm × 1.55 mm × 1.05 mm) compatible with automated pick-and-place and reflow |
Pinout & Package
Package: SOD123 - molded plastic case with cathode band marking; matte tin-plated Alloy 42 leadframe; moisture sensitivity level 1 per J-STD-020; weight ≈0.01 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; forms reference return path during regulation |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input voltage source; maintains stable voltage drop across load or feedback network |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use with PPAP support and IATF16949 manufacturing |
| Tight Zener voltage tolerance | ±2.5% (5% total range) enables single-supply rail monitoring without trimming resistors |
| Low capacitance | ≈1.5 pF at 1 MHz - preserves signal integrity in high-frequency feedback loops and RF bias networks |
| Halogen- and antimony-free "Green" construction | <900 ppm Br/Cl, <1000 ppm Sb - meets EU RoHS 3 and automotive environmental compliance requirements |
| Lead-free and RoHS 3 compliant | Fully compliant with Directive 2015/863/EU - suitable for global electronics manufacturing |
Applications
| Automotive ECU Reference | Industrial Sensor Biasing |
|---|---|
Use Scenario: Providing stable 30 V reference for ADC input scaling and microcontroller voltage supervision in engine control units. IC Role / Device Role / Timing Role: Precision voltage reference for analog front-end conditioning and brown-out detection circuitry. Use Value: Maintains ±0.75 V accuracy over –40°C to +125°C, eliminating calibration drift in emission-critical systems. |
Use Scenario: Biasing bridge sensors and RTDs in factory automation pressure and temperature transmitters. IC Role / Device Role / Timing Role: Low-drift excitation source enabling ratiometric measurement against stable Zener voltage. Use Value: 55 Ω dynamic impedance minimizes gain error from sensor current draw, improving measurement resolution by ≥12-bit effective ENOB. |
| DC-DC Converter Feedback | Overvoltage Protection Clamp |
Use Scenario: Setting output voltage of isolated flyback converters in telecom power supplies via optocoupler feedback loop. IC Role / Device Role / Timing Role: Primary-side voltage reference replacing TL431 where higher Zener voltage simplifies resistor divider design. Use Value: 30 V rating allows direct use with 48 V input rails, reducing component count and improving transient response vs. cascaded references. |
Use Scenario: Clamping surge-induced transients on 24 V CAN bus power lines and industrial I/O modules. IC Role / Device Role / Timing Role: Fast-acting shunt protector limiting voltage excursion above 30.5 V during ESD or load dump events. Use Value: 0.05 µA leakage at 23 V prevents false triggering while 470 mW rating absorbs 8/20 µs surges up to 12 A peak. |
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 ±5%, 90 Ω ZZT @ 5 mA, SOT-23 package, no AEC-Q101 qualification | Higher impedance limits regulation accuracy in precision feedback; smaller SOT-23 footprint reduces thermal mass | Select for cost-sensitive consumer designs where automotive qualification and low ZZT are not required |
| MMSZ5257ET1G | 30 V ±5%, 35 Ω ZZT @ 20 mA, SOD-123, no AEC-Q101, 500 mW PD | Lower ZZT improves regulation but requires higher test current; lacks automotive traceability and PPAP support | Prefer for non-automotive industrial applications needing tighter dynamic regulation at higher bias currents |
Compared with BZX84-C30LT1G and MMSZ5257ET1G, DDZ30DQ-7 offers superior thermal stability, automotive-grade process control, and lower impedance at its specified 5 mA test current-making it the only option qualified for safety-critical vehicle subsystems requiring documented change control and IATF16949 traceability.
Availability
DDZ30DQ-7 is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor signal conditioning, and DC-DC converter feedback applications requiring stable component supply with full AEC-Q101 documentation and traceable sourcing.
Supply support for DDZ30DQ-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 since 1960.
The DDZ series targets precision voltage reference needs in harsh-environment electronics, with design focus on tight Zener tolerance, low temperature coefficient, and AEC-Q101-compliant manufacturing for functional safety–related subsystems.
FAQ
What is the maximum Zener test current for DDZ30DQ-7?
The datasheet specifies a Zener test current (IZT) of 5 mA for parameter characterization. At this current, the device achieves its rated Zener voltage range (29.02 V to 30.51 V) and dynamic impedance (55 Ω). Operation beyond 5 mA is permissible up to the 470 mW power limit, but voltage regulation accuracy degrades due to self-heating and impedance rise.
Is DDZ30DQ-7 suitable for bidirectional ESD protection?
No-DDZ30DQ-7 is a unidirectional Zener diode optimized for reverse-bias voltage regulation. It lacks symmetric breakdown characteristics and has no specified forward surge rating. For bidirectional ESD protection, purpose-built TVS diodes such as the D28V0L4B2P or SMAJ30A should be used instead.
How does the SOD123 package affect thermal performance compared to DO-35?
The SOD123 package provides 425°C/W junction-to-ambient thermal resistance with minimum pad layout-significantly higher than DO-35's ~200°C/W-but enables automated assembly and saves >60% board area. Its lower thermal mass also improves transient thermal response, making it preferable for pulsed regulation despite reduced steady-state power handling.
Does DDZ30DQ-7 require external series resistance in typical applications?
Yes-a current-limiting resistor is mandatory to prevent thermal runaway. For example, with a 36 V supply and 5 mA target Zener current, a 1.2 kΩ resistor sets safe operating point. The resistor value must be calculated using (VIN − VZ) / IZ, accounting for worst-case VZ tolerance and supply variation to ensure IZ stays within 0.5 mA to 10 mA recommended range.
DDZ30DQ-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 29.77 V
- Tolerance:
- ±3%
- Power - Max:
- 470 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
DDZ30DQ-7 FAQ
1.How can I place an order for DDZ30DQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ30DQ-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 DDZ30DQ-7 reliable?
The price and inventory of DDZ30DQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ30DQ-7 is usually 5 days.
3.What payment methods are accepted for DDZ30DQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ30DQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ30DQ-7?
DDZ30DQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ30DQ-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 DDZ30DQ-7?
For technical support, including DDZ30DQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ30DQ-7 requirements.
6.How does Aetrix verify that DDZ30DQ-7 is sourced from the original manufacturer or authorized distributors?
All DDZ30DQ-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 DDZ30DQ-7 meets industry standards.
7.What is the process for return or replacement of DDZ30DQ-7?
All DDZ30DQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ30DQ-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 DDZ30DQ-7 part is unused and in its original packaging.
Return procedure for DDZ30DQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DDZ30DQ-7 Tags
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