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Diodes Incorporated DDZX43-7
- Part No.:
- DDZX43-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
DDZX43-7.pdf
- Description:
- DIODE ZENER 43V 300MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
DDZX43-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal zener voltage 43 V (min 42.14 V, max 43.86 V), 5 mA test current, 90 Ω zener impedance at 5 mA, 300 mW power dissipation on FR-4 PCB, and AEC-Q101 qualification for automotive reliability. It serves as a stable voltage reference in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the DDZX43-7 datasheet, DDZX43-7 pinout, DDZX43-7 application, or DDZX43-7 equivalent, key selection criteria include its tight 4% VZ tolerance, low 50 nA reverse leakage at 33 V, SOT23 package compatibility with automated assembly, and temperature coefficient behavior above 30 V shown in Figure 19.
Technical Context
This device operates in reverse breakdown to maintain a stable reference voltage under controlled current conditions. Its zener impedance of 90 Ω at IZT = 5 mA and <100 nA leakage at VR = 33 V define regulation accuracy and standby power loss in precision biasing applications.
The SOT23 package enables high-density layout while delivering 417 °C/W thermal resistance to ambient on FR-4 PCB. Temperature coefficient ranges from +0.04 %/°C to +0.10 %/°C across the 42–44 V range (Fig. 19), supporting predictable drift compensation in industrial sensor references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 42.14–43.86 V at IZT = 5 mA - defines ±4% tolerance band for voltage reference stability |
| Zener Impedance (ZZT) | 90 Ω at IZT = 5 mA - determines AC regulation error under dynamic load changes |
| Power Dissipation (PD) | 300 mW on FR-4 PCB - sets maximum continuous DC power handling without derating |
| Reverse Leakage (IR) | 50 nA at VR = 33 V - ensures minimal quiescent current in high-impedance reference nodes |
| Thermal Resistance (RθJA) | 417 °C/W - quantifies junction-to-ambient self-heating under 300 mW operation |
| Operating Temperature | −65 to +150 °C - supports extended-range industrial and automotive under-hood use |
| AEC-Q101 Qualified | Yes - confirms reliability validation for automotive electronic control units |
Pinout & Package
Package: SOT23 - surface-mount plastic case with matte tin annealed terminals, moisture sensitivity level 1, weight ≈ 0.008 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground path | Connected to system ground when used in shunt regulator configuration |
| Cathode (Pin 2) | Zener breakdown terminal / voltage reference output | Provides stable 43 V reference point relative to anode; connects to feedback node |
| NC / Heat Sink (Pin 3) | Non-connected / thermal pad | No internal connection; may be tied to ground plane for thermal relief but not electrically required |
Key Features
| Feature | Design Value |
|---|---|
| Very sharp breakdown characteristics | Enables precise clamping at 43 V with minimal knee voltage spread (<1.72 V total span) |
| Tight VZ tolerance (±4%) | Reduces need for post-production trimming in voltage reference designs |
| Low leakage (50 nA @ 33 V) | Minimizes error current in high-impedance op-amp reference inputs |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling and HTRB |
| SOT23 footprint | Supports automated pick-and-place and reflow soldering with standard 0.9 mm pitch |
Applications
| Industrial Power Supply Feedback | Automotive ECU Reference |
|---|---|
|
Use Scenario: Regulating 48 V intermediate bus in programmable logic controller (PLC) power modules. IC Role / Device Role / Timing Role: Shunt voltage reference for TL431-based feedback loop controlling primary-side PWM duty cycle. Use Value: Tight 4% VZ tolerance eliminates need for external resistor trimming; low leakage avoids loading error in high-gain error amplifier. |
Use Scenario: Providing stable 43 V reference for battery management system (BMS) cell voltage monitoring circuitry. IC Role / Device Role / Timing Role: Precision clamp protecting ADC input during transient overvoltage events on 42 V hybrid vehicle battery strings. Use Value: AEC-Q101 qualification ensures long-term stability under thermal cycling; sharp knee prevents false triggering below threshold. |
| Test Equipment Calibration | Telecom Line Card Protection |
|
Use Scenario: Generating traceable 43 V reference in portable multimeter calibration fixtures. IC Role / Device Role / Timing Role: Primary voltage standard against which DMM front-end gain stages are adjusted. Use Value: Low TC (+0.08 %/°C typical) minimizes calibration drift across 15–35 °C lab environments. |
Use Scenario: Overvoltage clamping on -48 V telecom distribution lines exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Secondary protection element downstream of primary gas discharge tube (GDT), limiting let-through voltage to safe levels. Use Value: 90 Ω zener impedance ensures rapid response to fast-rising transients; SOT23 allows dense placement near protected ICs. |
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 | Looser 5% VZ tolerance (40.9–45.1 V), higher ZZT = 100 Ω, no AEC-Q101 qualification | Acceptable for non-automotive consumer power supplies where cost is prioritized over drift stability | Select when AEC-Q101 compliance and sub-4% tolerance are not required |
| MMSZ43ET1G | Same 43 V nominal rating, tighter 2% tolerance (42.2–43.8 V), lower ZZT = 75 Ω, AEC-Q101 qualified | Better suited for high-accuracy analog front-ends requiring minimal regulation error | Choose when improved impedance and tighter tolerance justify slightly higher unit cost |
Compared with DDZX43-7, BZX84-C43-7 offers lower cost but sacrifices automotive qualification and regulation precision, while MMSZ43ET1G improves both tolerance and impedance at modest cost premium-making it preferable for metrology-grade references.
Availability
DDZX43-7 is available at Aetrix Electronics and suitable for industrial power supply feedback, automotive ECU reference, and telecom line card protection requiring stable component supply with full traceability and lifecycle continuity.
Supply support for DDZX43-7 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 and manufacturing operations across Asia and the Americas.
The DDZX series targets high-reliability voltage reference applications, emphasizing tight tolerance, low leakage, and automotive qualification in compact SOT23 packaging for space-constrained systems.
FAQ
What is the maximum continuous power dissipation for DDZX43-7 on standard FR-4 PCB?
The DDZX43-7 is rated for 300 mW continuous power dissipation when mounted on FR-4 PCB using the recommended pad layout per Diodes Inc. package outline documentation. Derating begins linearly above +25°C ambient, reaching zero power at +150°C per the Fig. 1 derating curve.
Does DDZX43-7 have polarity marking, and how is it identified on the SOT23 package?
Yes, DDZX43-7 uses standard SOT23 polarity: the cathode is marked by a band adjacent to Pin 2, and the anode is Pin 1. The top-view schematic in the DS30408 datasheet (page 2) confirms this orientation, matching industry-standard SOT23 diode marking convention.
Is DDZX43-7 suitable for use in high-frequency noise suppression applications?
No - DDZX43-7 is optimized for DC and low-frequency voltage regulation, not RF filtering. Its typical capacitance is ~1.5 pF at 2 V reverse bias (inferred from Fig. 10 trend), too low for effective HF shunting; dedicated TVS or RF capacitors are recommended for noise suppression.
How does the temperature coefficient of DDZX43-7 compare to lower-voltage Zeners in the same series?
DDZX43-7 exhibits a positive temperature coefficient of +0.04 to +0.10 %/°C (per Fig. 19), consistent with higher-voltage Zeners (>30 V). This contrasts with lower-voltage variants like DDZX6V2B (−0.06 %/°C), enabling predictable drift direction for compensation network design.
DDZX43-7 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):
- 43 V
- Tolerance:
- ±2%
- Power - Max:
- 300 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:
- SOT-23-3
DDZX43-7 FAQ
1.How can I place an order for DDZX43-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZX43-7 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 DDZX43-7 reliable?
The price and inventory of DDZX43-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZX43-7 is usually 5 days.
3.What payment methods are accepted for DDZX43-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZX43-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZX43-7?
DDZX43-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZX43-7 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 DDZX43-7?
For technical support, including DDZX43-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZX43-7 requirements.
6.How does Aetrix verify that DDZX43-7 is sourced from the original manufacturer or authorized distributors?
All DDZX43-7 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 DDZX43-7 meets industry standards.
7.What is the process for return or replacement of DDZX43-7?
All DDZX43-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZX43-7, 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 DDZX43-7 part is unused and in its original packaging.
Return procedure for DDZX43-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DDZX43-7 Tags
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