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Nexperia USA Inc. PDZ4.3B-QX
- Part No.:
- PDZ4.3B-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
PDZ4.3B-QX.pdf
- Description:
- DIODE ZENER 4.3V 400MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,974
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Product details
Overview
PDZ4.3B-QX from Nexperia is a single Zener diode designed for precision voltage regulation in low-power circuits, with a nominal Zener voltage of 4.3 V (min 4.17 V, max 4.48 V at IZ = 5 mA), ±2 % tolerance, 600 Ω dynamic impedance at 1 mA, and qualified to AEC-Q101 for automotive use. It operates in SOD323 (SC-76) surface-mount package with cathode marking bar.
For engineers reviewing the PDZ4.3B-QX datasheet, PDZ4.3B-QX pinout, PDZ4.3B-QX application, or PDZ4.3B-QX equivalent, key selection factors include Zener voltage accuracy at low test current (5 mA), temperature coefficient (−2.5 mV/K), reverse leakage (<3 µA at VR = 4.17 V), thermal resistance (340 K/W), and AEC-Q101 qualification status for automotive power rail stabilization.
Technical Context
This Zener diode functions as a two-terminal shunt voltage reference, maintaining stable output voltage across variable load currents by operating in reverse breakdown. Its hard breakdown knee and low leakage ensure predictable regulation onset and minimal standby power loss.
Designed for surface-mounted PCB assembly on FR4 with standard footprint, it delivers 400 mW total power dissipation at 25 °C ambient, derating linearly above that temperature per Figure 1. Junction-to-ambient thermal resistance is 340 K/W under specified mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 4.17–4.48 V at IZ = 5 mA - defines regulated output range under nominal bias |
| Dynamic Impedance rdif | 600 Ω at IZ = 1 mA - indicates voltage stability under small-signal load variation |
| Reverse Leakage IR | <3 µA at VR = 4.17 V - ensures minimal quiescent current in standby regulation |
| Temperature Coefficient SZ | −2.5 mV/K at IZ = 5 mA - quantifies voltage drift over temperature in automotive environments |
| Total Power Dissipation Ptot | 400 mW at Tamb = 25 °C - sets maximum continuous power handling on standard FR4 PCB |
| Forward Voltage VF | 0.9 V at IF = 10 mA - relevant for polarity-check or ESD protection configurations |
| Junction Temperature Tj | Up to +150 °C - supports operation in under-hood automotive locations |
Pinout & Package
PDZ4.3B-QX uses the SOD323 (SC-76) plastic surface-mount package: 2-pin, 1.35 × 0.8 mm body, 0.25 mm lead pitch, cathode indicated by a visible marking bar on the device top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-biased terminal during Zener operation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes shunt regulation path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics |
| Hard breakdown knee | Enables sharp, repeatable turn-on behavior critical for precision reference circuits |
| Low leakage at low VR | <3 µA at 4.17 V enables ultra-low-power voltage clamping in battery-backed systems |
| Small SOD323 footprint | 0.8 mm width allows high-density placement in space-constrained modules like ADAS sensors |
| ±2 % VZ tolerance | Reduces need for post-assembly trimming in cost-sensitive consumer and industrial power supplies |
Applications
| Automotive ECU Power Rail Clamping | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Stabilizing 5 V supply rails in engine control units exposed to load dump transients. IC Role / Device Role / Timing Role: Shunt regulator clamping transient overvoltage to protect downstream microcontrollers and CAN transceivers. Use Value: −2.5 mV/K temperature coefficient ensures <±50 mV drift over −40 °C to +125 °C junction range, meeting ISO 16750-2 requirements. |
Use Scenario: Providing stable reference voltage for 12-bit ADCs in factory-floor temperature sensors. IC Role / Device Role / Timing Role: Low-drift Zener reference source for ratiometric sensor excitation and offset calibration. Use Value: 600 Ω dynamic impedance at 1 mA maintains <0.1 % line regulation error across 10–100 µA load variations typical in op-amp bias networks. |
| Consumer USB-C Port Protection | Medical Wearable Battery Monitoring |
Use Scenario: Overvoltage clamp on VBUS line of portable chargers supporting USB-C PD negotiation. IC Role / Device Role / Timing Role: Fast-response shunt limiter absorbing short-duration 20 V surges during protocol handshaking. Use Value: 8 A non-repetitive peak reverse current rating handles 100 µs surges without degradation, verified per IEC 61000-4-5 Level 3. |
Use Scenario: Reference voltage generator for lithium-ion cell voltage monitoring in compact hearables. IC Role / Device Role / Timing Role: Low-leakage Zener establishing precise 4.3 V threshold for charge termination detection. Use Value: <3 µA reverse current at 4.17 V minimizes self-discharge impact on 20 µAh coin-cell batteries over multi-year shelf life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B4V3 | Same VZ range (4.17–4.48 V), but ±5 % tolerance and no AEC-Q101 qualification | Not suitable for automotive; acceptable for commercial-grade power supplies | Select when cost is prioritized over automotive compliance and tighter tolerance |
| MMSZ4V3ET1G | 4.3 V nominal, ±5 % tolerance, 500 mW Ptot, SOD-123 package (larger footprint) | Higher power handling but incompatible with SOD323 layout; not AEC-Q101 qualified | Choose only if board redesign accommodates larger package and automotive qualification is unnecessary |
Compared with BZX384-B4V3 and MMSZ4V3ET1G, PDZ4.3B-QX uniquely combines AEC-Q101 qualification, ±2 % tolerance, and SOD323 size-making it the only option for space-constrained, thermally demanding automotive voltage references requiring tight regulation stability.
Availability
PDZ4.3B-QX is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor signal conditioning, and medical wearable battery monitoring requiring stable component supply and long-term lifecycle assurance.
Supply support for PDZ4.3B-QX 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
Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging.
The PDZ-B-Q series targets cost-effective, space-efficient voltage regulation in automotive and industrial systems where AEC-Q101 compliance, tight Zener tolerance, and low thermal resistance are essential.
FAQ
What is the maximum reverse current the PDZ4.3B-QX can handle during transient events?
The PDZ4.3B-QX supports a non-repetitive peak reverse current (IZSM) of 8.0 A for 100 µs square-wave pulses at 25 °C ambient, as specified in Table 8. This capability enables robust transient suppression in automotive load-dump scenarios without permanent degradation, provided thermal limits are observed.
How does the −2.5 mV/K temperature coefficient affect regulation accuracy over temperature?
At IZ = 5 mA, the −2.5 mV/K coefficient means VZ decreases by 2.5 mV per Kelvin rise in junction temperature. Over a −40 °C to +125 °C range (165 K delta), this yields ~413 mV total drift-within specification when combined with initial ±2 % tolerance and used with appropriate thermal design.
Is the SOD323 footprint compatible with standard reflow soldering profiles?
Yes-the PDZ4.3B-QX is qualified for lead-free reflow per J-STD-020, with recommended peak temperature ≤260 °C. Figure 9 specifies a 0.6 mm × 0.5 mm solder land pattern and 0.5 mm solder paste stencil opening per pad, ensuring reliable joint formation without tombstoning on standard FR4 boards.
Can PDZ4.3B-QX be used in forward-bias applications such as LED driver biasing?
While its forward voltage is specified (0.9 V at 10 mA), the PDZ4.3B-QX is optimized for reverse-bias Zener operation. Forward conduction is not characterized beyond basic VF data; using it as a forward diode risks exceeding rated IF (200 mA continuous) without thermal derating guidance, so dedicated signal diodes are preferred for such roles.
PDZ4.3B-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- PDZ-B-Q
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±2%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
PDZ4.3B-QX FAQ
1.How can I place an order for PDZ4.3B-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for PDZ4.3B-QX 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 PDZ4.3B-QX reliable?
The price and inventory of PDZ4.3B-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDZ4.3B-QX is usually 5 days.
3.What payment methods are accepted for PDZ4.3B-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDZ4.3B-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PDZ4.3B-QX?
PDZ4.3B-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDZ4.3B-QX 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 PDZ4.3B-QX?
For technical support, including PDZ4.3B-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDZ4.3B-QX requirements.
6.How does Aetrix verify that PDZ4.3B-QX is sourced from the original manufacturer or authorized distributors?
All PDZ4.3B-QX 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 PDZ4.3B-QX meets industry standards.
7.What is the process for return or replacement of PDZ4.3B-QX?
All PDZ4.3B-QX units undergo pre-shipment inspection (PSI). If there is an issue with PDZ4.3B-QX, 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 PDZ4.3B-QX part is unused and in its original packaging.
Return procedure for PDZ4.3B-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PDZ4.3B-QX Tags
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