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Diodes Incorporated DDZX43-13
- Part No.:
- DDZX43-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
DDZX43-13.pdf
- Description:
- DIODE ZENER 43V 300MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:6,036
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Product details
Overview
DDZX43-13 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 1 kHz, 0.05 μA reverse leakage at 33 V, and 300 mW power dissipation on FR-4 PCB. It is used for voltage regulation and reference in automotive-grade power supply monitoring circuits.
For engineers reviewing the DDZX43-13 datasheet, DDZX43-13 pinout, DDZX43-13 application, or DDZX43-13 equivalent, key selection criteria include tight VZ tolerance (±2%), low temperature coefficient (≈+0.09%/°C per Fig. 19), AEC-Q101 qualification, SOT23 package compatibility, and stable regulation under low-current bias conditions.
Technical Context
This device operates as a two-terminal voltage reference, relying on controlled avalanche breakdown in silicon to maintain stable reverse-biased voltage across its terminals. Its sharp knee characteristic enables accurate regulation even at low currents (IZK = 0.5 mA) and low power levels.
The SOT23 package supports automated assembly and delivers thermal resistance of 417 °C/W (junction-to-ambient on FR-4), enabling reliable operation up to +150 °C junction temperature. Its halogen- and antimony-free "Green" construction complies with RoHS 2 and AEC-Q101 stress testing requirements.
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 f = 1 kHz - determines AC ripple rejection and load regulation stability |
| Reverse Leakage (IR) | 0.05 μA at VR = 33 V - ensures minimal error current in high-impedance reference paths |
| Power Dissipation (PD) | 300 mW on FR-4 PCB - sets maximum continuous DC or pulsed power handling without derating |
| Operating Temperature | −65 to +150 °C - supports under-hood automotive and industrial environments |
| Temperature Coefficient | ≈+0.09 %/°C near 43 V (Fig. 19) - quantifies drift over temperature for precision reference design |
Pinout & Package
Package: SOT23 - surface-mount, 3-terminal 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 | Connected to system ground or lower-potential node in shunt regulator configuration |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Connected to input via series resistor and supplies stable reference voltage to feedback or sensing circuitry |
| No-Connect (Pin 3) | Internal die attach flag / mechanical support | Not electrically connected; serves structural role in SOT23 leadframe; must remain unconnected in layout |
Key Features
| Feature | Design Value |
|---|---|
| Very tight VZ tolerance | ±2% (42.14–43.86 V) - reduces need for post-production calibration in voltage reference designs |
| AEC-Q101 qualification | Qualified for automotive applications - meets stress tests for temperature cycling, HTRB, and ESD per AEC standard |
| Low leakage current | 0.05 μA @ 33 V - minimizes error in high-resistance divider networks and battery-monitoring circuits |
| Sharp breakdown knee | Defined ZZK = 480 Ω @ IZK = 1 mA - enables stable regulation down to sub-mA bias currents |
| Lead-free & Green construction | <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - satisfies global environmental compliance without performance trade-offs |
Applications
| Automotive Power Rail Monitoring | Industrial Sensor Reference Supply |
|---|---|
|
Use Scenario: Monitoring 48 V battery systems in start-stop and mild-hybrid vehicles to detect overvoltage faults before ECU shutdown. IC Role / Device Role / Timing Role: Shunt voltage reference in comparator-based overvoltage detection circuit. Use Value: Tight ±2% VZ tolerance ensures consistent trip threshold across temperature and lifetime without trimming. |
Use Scenario: Providing stable excitation voltage to bridge-type pressure sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Precision analog reference source for ratiometric sensor signal conditioning. Use Value: Low 0.05 μA leakage prevents loading errors in high-impedance Wheatstone bridge outputs. |
| Programmable Power Supply Feedback | Medical Equipment Voltage Clamp |
|
Use Scenario: Setting adjustable output voltage in digitally controlled lab-grade DC power supplies using DAC-controlled resistor networks. IC Role / Device Role / Timing Role: Primary voltage reference in programmable feedback divider network. Use Value: 90 Ω zener impedance ensures minimal interaction with DAC output impedance, preserving setpoint accuracy. |
Use Scenario: Clamping auxiliary supply rails in portable ultrasound devices to protect analog front-end ICs from transient overvoltage. IC Role / Device Role / Timing Role: Overvoltage protection element in low-power analog subsystems. Use Value: AEC-Q101 qualification provides proven reliability margin for safety-critical medical applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C43-7 | ±5% VZ tolerance (40.9–45.1 V); 100 Ω ZZT; not AEC-Q101 qualified | Suitable for non-automotive consumer power supplies where cost is prioritized over precision and qualification | Select when ±5% regulation tolerance is acceptable and automotive qualification is unnecessary. |
| MMSZ43ET1G | ±5% VZ tolerance (40.9–45.1 V); 100 Ω ZZT; AEC-Q101 qualified but higher leakage (1 μA @ 33 V) | Acceptable for automotive use but introduces larger error in high-impedance reference nodes | Select only if board space allows SOD-123 and leakage >0.05 μA is tolerable in the reference path. |
Compared with BZX84-C43-7 and MMSZ43ET1G, DDZX43-13 offers superior ±2% voltage accuracy, lower 0.05 μA leakage, and identical AEC-Q101 qualification-making it optimal for high-precision automotive and industrial voltage reference designs where regulation stability and long-term drift matter.
Availability
DDZX43-13 is available at Aetrix Electronics and suitable for automotive power monitoring, industrial sensor excitation, and programmable power supply feedback requiring stable component supply with full traceability and lifecycle continuity.
Supply support for DDZX43-13 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.
DDZX43-13 belongs to the DDZX precision Zener diode product line, engineered for stable voltage reference and regulation in harsh-environment applications demanding AEC-Q101 qualification and tight parametric control.
FAQ
What is the maximum continuous power dissipation for DDZX43-13 on a standard FR-4 PCB?
The DDZX43-13 is rated for 300 mW continuous power dissipation when mounted on an FR-4 printed circuit board using the recommended pad layout. This rating assumes ambient temperature of +25°C and drops linearly above +25°C per the derating curve in Figure 1, reaching zero at +150°C ambient.
Is DDZX43-13 suitable for automotive applications?
Yes-DDZX43-13 is qualified to AEC-Q101 standards, including temperature cycling, high-temperature reverse bias (HTRB), and electrostatic discharge (ESD) testing. It is explicitly designed for automotive power rail monitoring and control systems requiring high reliability under extended temperature and vibration stress.
How does the zener impedance of DDZX43-13 affect its performance in a reference circuit?
With ZZT = 90 Ω at 1 kHz, DDZX43-13 exhibits low dynamic impedance, minimizing output voltage variation due to load or supply ripple. This enables stable reference behavior in feedback networks where series resistance or DAC output impedance could otherwise cause gain error or noise coupling.
What is the polarity marking convention for the SOT23 package of DDZX43-13?
The DDZX43-13 uses standard SOT23 pinout: Pin 1 (anode) is marked by a beveled corner or notch on the package top view; Pin 2 (cathode) is adjacent and carries the zener voltage; Pin 3 is internally unconnected. Polarity is confirmed in the "Top View Device Schematic" on page 2 of DS30408 Rev. 13-2.
DDZX43-13 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:
- Obsolete
- 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
DDZX43-13 FAQ
1.How can I place an order for DDZX43-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZX43-13 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 DDZX43-13 reliable?
The price and inventory of DDZX43-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZX43-13 is usually 5 days.
3.What payment methods are accepted for DDZX43-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZX43-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZX43-13?
DDZX43-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZX43-13 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 DDZX43-13?
For technical support, including DDZX43-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZX43-13 requirements.
6.How does Aetrix verify that DDZX43-13 is sourced from the original manufacturer or authorized distributors?
All DDZX43-13 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 DDZX43-13 meets industry standards.
7.What is the process for return or replacement of DDZX43-13?
All DDZX43-13 units undergo pre-shipment inspection (PSI). If there is an issue with DDZX43-13, 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 DDZX43-13 part is unused and in its original packaging.
Return procedure for DDZX43-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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