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Diodes Incorporated DDZ43-7
- Part No.:
- DDZ43-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
DDZ43-7.pdf
- Description:
- DIODE ZENER 43V 470MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
DDZ43-7 from Diodes Incorporated is a surface-mount precision Zener diode rated for 42.14–43.86 V nominal zener voltage at 5 mA test current, with 90 Ω maximum zener impedance at 5 mA and 0.05 µA maximum reverse leakage at 33 V. It delivers stable voltage reference in low-power analog circuits and is packaged in SOD123 for automated PCB assembly.
For engineers reviewing the DDZ43-7 datasheet, DDZ43-7 pinout, DDZ43-7 application, or DDZ43-7 equivalent, key selection criteria include tight VZ tolerance (±2%), low temperature coefficient (±0.08%/°C), automotive-grade AEC-Q101 qualification (Q variant), and thermal resistance of 425 °C/W on minimal pad layout.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to maintain a stable output voltage across varying load and supply conditions. Its design targets high-precision regulation where ±2% initial VZ accuracy and low dynamic impedance (90 Ω) are required at IZT = 5 mA.
The DDZ43-7 uses silicon planar epitaxial construction with cathode band marking and matte tin–annealed Alloy 42 leads. It exhibits a typical temperature coefficient of +0.08%/°C near 43 V, enabling predictable drift compensation in reference circuits without external trimming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 42.14–43.86 V at IZT = 5 mA - defines precise regulation point for feedback loops and reference rails |
| Zener Impedance (ZZT) | ≤90 Ω at IZT = 5 mA - ensures minimal output voltage variation under changing load current |
| Reverse Leakage (IR) | ≤0.05 µA at VR = 33 V - guarantees negligible error current in high-impedance reference nodes |
| Power Dissipation (PD) | 294 mW at TA = +25°C on minimal pad - sets practical upper limit for continuous bias current (≈6.8 mA @ 43 V) |
| Thermal Resistance (RθJA) | 425 °C/W on standard FR-4 with minimum pad - determines junction temperature rise under steady-state operation |
| Temperature Coefficient | ±0.08%/°C near 43 V - enables predictable, linear VZ drift over –65 to +150°C operating range |
| Package | SOD123 - compact 2.65 mm × 1.55 mm surface-mount outline compatible with reflow and wave soldering |
Pinout & Package
DDZ43-7 is a two-terminal device in SOD123 package. Cathode is identified by a visible band on the component body; anode is unmarked. The package uses matte tin–annealed Alloy 42 leads, rated for MIL-STD-202 solderability and UL 94V-0 flammability compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Breakdown terminal | Connected to regulated output node; reverse-biased to establish fixed VZ drop |
| Anode (unmarked end) | Reference return | Typically tied to system ground or lower-potential rail; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage tolerance | ±2% at 43 V - reduces need for post-assembly calibration in voltage reference designs |
| Low dynamic impedance | 90 Ω at 5 mA - maintains regulation stability under transient load steps in analog sensor interfaces |
| Automotive qualification option | DDZ43Q-7 meets AEC-Q101 - supports use in engine control, ADAS power monitoring, and infotainment subsystems |
| Green compound packaging | Halogen- and antimony-free molding compound (<900 ppm Br/Cl, <1000 ppm Sb) - satisfies strict environmental compliance for global OEMs |
| Moisture sensitivity level | MSL Level 1 per J-STD-020 - eliminates bake requirements before reflow, lowering manufacturing cost |
Applications
| Industrial Sensor Signal Conditioning | Automotive Power Rail Monitoring |
|---|---|
|
Use Scenario: Precision voltage reference for 4–20 mA transmitter loop-powered sensors operating from 24 V DC rails. IC Role / Device Role / Timing Role: Zener diode provides stable 43 V clamp and reference for op-amp-based current regulation circuitry. Use Value: Tight ±2% VZ tolerance ensures consistent loop current accuracy across temperature and unit-to-unit variation. |
Use Scenario: Overvoltage protection and reference generation in 12 V/24 V vehicle battery monitoring modules. IC Role / Device Role / Timing Role: Acts as clamping element in microcontroller ADC input protection network and reference for voltage divider scaling. Use Value: Low 0.05 µA leakage at 33 V prevents loading errors in high-impedance divider networks feeding automotive-grade MCUs. |
| Programmable Power Supply Feedback | Medical Instrument Reference Stability |
|
Use Scenario: Adjustable output regulation in lab-grade bench power supplies using TL431-based feedback with external Zener assist. IC Role / Device Role / Timing Role: Provides secondary reference voltage to extend TL431 output range beyond its internal 2.495 V bandgap. Use Value: 90 Ω zener impedance minimizes interaction between TL431 error amplifier and external reference node, preserving loop stability. |
Use Scenario: Stable excitation source for precision bridge transducers in portable ECG and blood pressure monitors. IC Role / Device Role / Timing Role: Supplies regulated bias to Wheatstone bridge, directly impacting measurement resolution and offset repeatability. Use Value: ±0.08%/°C TC enables <±0.5% total VZ drift over 0–70°C medical operating range-no active compensation needed. |
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-C43-7 | Wider VZ tolerance (±5%), higher ZZT (120 Ω), same SOD123 package | Acceptable for non-critical biasing but unsuitable for metrology-grade references | Select when cost is prioritized over regulation accuracy and thermal stability |
| MMSZ43ET1G | ±5% VZ, 120 Ω ZZT, AEC-Q200 qualified (not Q101), slightly higher leakage (0.1 µA @ 33 V) | Valid for general automotive electronics but lacks PPAP support for safety-critical ECUs | Choose for non-safety automotive modules where full AEC-Q101 documentation is not mandated |
Compared with BZX84-C43-7 and MMSZ43ET1G, DDZ43-7 offers superior initial accuracy and lower dynamic impedance-critical for closed-loop regulation and high-resolution analog systems-while maintaining full AEC-Q101 traceability for functional-safety applications.
Availability
DDZ43-7 is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive power monitoring, programmable power supply feedback, and medical instrument reference stability requiring stable component supply and long-term sourcing continuity.
Supply support for DDZ43-7 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.
The DDZ series targets precision voltage reference applications demanding tight tolerance, low impedance, and robust thermal performance-designed specifically for analog signal chains in harsh environments.
FAQ
What is the maximum continuous Zener current for DDZ43-7 at room temperature?
The DDZ43-7 has a maximum power dissipation of 294 mW at TA = +25°C on minimal pad layout. At its nominal 43 V zener voltage, this corresponds to a maximum continuous Zener current of approximately 6.8 mA. Exceeding this value risks thermal runaway due to the device's 425 °C/W junction-to-ambient thermal resistance.
Does DDZ43-7 require derating above 25°C ambient?
Yes. DDZ43-7 must be derated linearly above +25°C ambient temperature. Its power dissipation drops to zero at +150°C, following a slope of −2.33 mW/°C (294 mW ÷ 125°C). For example, at +75°C ambient, allowable power is reduced to 175 mW, limiting usable Zener current to ~4.1 mA at 43 V.
How is polarity identified on the DDZ43-7 SOD123 package?
Polarity is marked by a distinct cathode band located at one end of the SOD123 body. This band aligns with the cathode terminal, which must be connected to the higher-potential side of the circuit during reverse-bias operation. The unmarked end is the anode and connects to the lower-potential reference point or ground.
Is DDZ43-7 suitable for use in AEC-Q101-compliant automotive designs?
The DDZ43-7 itself is the commercial-grade part. For automotive applications, the DDZ43Q-7 variant is specified: it is AEC-Q101 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. Designers must specify the "Q" suffix to ensure full automotive compliance and documentation support.
DDZ43-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±2%
- Power - Max:
- 470 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 33 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
DDZ43-7 FAQ
1.How can I place an order for DDZ43-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ43-7 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 DDZ43-7 reliable?
The price and inventory of DDZ43-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ43-7 is usually 5 days.
3.What payment methods are accepted for DDZ43-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ43-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ43-7?
DDZ43-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ43-7 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 DDZ43-7?
For technical support, including DDZ43-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ43-7 requirements.
6.How does Aetrix verify that DDZ43-7 is sourced from the original manufacturer or authorized distributors?
All DDZ43-7 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 DDZ43-7 meets industry standards.
7.What is the process for return or replacement of DDZ43-7?
All DDZ43-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ43-7, 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 DDZ43-7 part is unused and in its original packaging.
Return procedure for DDZ43-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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