My Inquiry
My Account
Nexperia USA Inc. PDZ4.3B-QF
- Part No.:
- PDZ4.3B-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
PDZ4.3B-QF.pdf
- Description:
- DIODE ZENER 4.3V 400MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,397
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
PDZ4.3B-QF 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 (4.17–4.48 V at IZ = 5 mA), ±2 % tolerance, 600 Ω dynamic impedance at 1 mA, and AEC-Q101 qualification for automotive use in engine control units and body electronics.
For engineers reviewing the PDZ4.3B-QF datasheet, PDZ4.3B-QF pinout, PDZ4.3B-QF application, or PDZ4.3B-QF equivalent, this device supports stable reference generation in space-constrained SMD designs requiring low leakage (<3 µA at VR = 3.4 V), hard breakdown knee, and thermal robustness up to 150 °C junction temperature.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain a stable reference voltage under varying load and supply conditions. Its 4.3 V nominal working voltage places it in the low-voltage Zener range where temperature coefficient is negative (−2.5 mV/K), minimizing drift in ambient-temperature-sensitive applications.
The device delivers 90 Ω typical differential resistance at 5 mA and exhibits <3 µA reverse current at 3.4 V, enabling accurate clamping and regulation in feedback loops of DC-DC converters and sensor biasing circuits without significant quiescent power penalty.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 4.17–4.48 V at IZ = 5 mA - defines tight regulation window for 3.3 V/5 V rail monitoring and protection |
| Dynamic Impedance rdif | 600 Ω at IZ = 1 mA - ensures minimal voltage shift under light-load transients |
| Reverse Current IR | ≤3 µA at VR = 3.4 V - enables low-power standby operation without loading reference nodes |
| Power Dissipation Ptot | 400 mW at Tamb ≤ 25 °C - supports continuous regulation in compact SOD323 footprint without forced cooling |
| Thermal Resistance Rth(j-a) | 340 K/W on FR4 PCB - determines derating slope (see Fig. 1) for reliable operation up to 125 °C ambient |
| Temperature Coefficient SZ | −2.5 mV/K at IZ = 5 mA - quantifies predictable negative drift, critical for temperature-compensated references |
| Junction Temperature Tj | Max +150 °C - enables deployment in under-hood automotive environments per AEC-Q101 stress testing |
Pinout & Package
PDZ4.3B-QF uses the SOD323 (SC-76) surface-mount plastic package: 1.7 mm × 1.35 mm body, 0.45 mm height, cathode marked by a bar on the top surface. Thermal performance assumes standard FR4 PCB mounting with single-sided copper and tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; polarity must be observed for correct Zener conduction |
| 2 (A) | Anode | Connected to ground or lower-potential rail; forms reverse-bias path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including HTGB, HTRB, and temperature cycling per discrete semiconductor stress test standard |
| Hard breakdown knee | Sharp, well-defined Zener transition enables precise threshold detection without soft clipping or hysteresis |
| Low leakage current | ≤3 µA at 80 % of VZ minimizes error in high-impedance voltage divider networks and battery-monitoring circuits |
| Small SOD323 footprint | 0.8 mm lead pitch and 1.35 mm width allow placement in dense layouts near microcontrollers and PMICs |
| Stable −2.5 mV/K tempco | Predictable negative drift allows compensation via series resistor or complementary NTC network in precision references |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Regulating reference voltage for analog-to-digital conversion of throttle position and coolant temperature sensors. IC Role / Device Role / Timing Role: Zener diode provides stable 4.3 V reference to ADC input stage and op-amp bias networks. Use Value: Tight ±2 % tolerance and −2.5 mV/K tempco enable <±10 mV total drift over −40 °C to +125 °C, meeting ASIL-B functional safety margin. |
Use Scenario: Clamping transient overvoltage on 4–20 mA current loop transmitter outputs. IC Role / Device Role / Timing Role: Zener acts as shunt protector between signal line and ground, diverting ESD and surge energy. Use Value: 600 Ω dynamic impedance at 1 mA ensures fast response to sub-µs transients while maintaining <3 µA leakage during normal operation. |
| Consumer Power Adapter Feedback | Medical Wearable Battery Monitoring |
|
Use Scenario: Providing feedback voltage to primary-side controller in isolated flyback AC-DC adapters. IC Role / Device Role / Timing Role: Zener diode sets regulation point for optocoupler LED drive current in secondary-side sensing. Use Value: 400 mW power rating supports continuous dissipation during load-step events without thermal runaway on FR4 PCB. |
Use Scenario: Biasing voltage reference for lithium-ion cell voltage measurement in compact wearable health monitors. IC Role / Device Role / Timing Role: Zener supplies stable reference to low-power SAR ADC sampling battery voltage every 5 seconds. Use Value: SOD323 package fits within 2.5 mm × 2.5 mm board area budget; 3 µA max leakage extends battery life beyond 12 months. |
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 4.3 V nominal, ±2 %, but 300 mW Ptot, higher rdif (1000 Ω @ 1 mA), no AEC-Q101 qualification | Limited to commercial-grade consumer products; unsuitable for automotive under-hood deployment | Select when cost sensitivity outweighs automotive qualification and thermal margin requirements |
| MMSZ4V3T1G | 4.3 V nominal, ±5 % tolerance, 500 mW Ptot, 1000 Ω rdif @ 1 mA, AEC-Q101 qualified | Looser voltage accuracy impacts ADC reference stability; higher power rating suits higher-current clamp use | Choose when wider tolerance is acceptable and higher surge current handling (IZSM = 10 A) is required |
Compared with BZX384-B4V3 and MMSZ4V3T1G, PDZ4.3B-QF offers superior voltage accuracy (±2 % vs ±5 %), lower dynamic impedance (600 Ω vs ≥1000 Ω), and guaranteed AEC-Q101 compliance-making it optimal for automotive and industrial systems demanding tight regulation and long-term reliability.
Availability
PDZ4.3B-QF is available at Aetrix Electronics and suitable for automotive engine control units, industrial sensor interfaces, and medical wearable battery monitoring systems requiring stable component supply across extended product lifecycles.
Supply support for PDZ4.3B-QF 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 logic, discrete, and MOSFET devices, with manufacturing rooted in process technology leadership and automotive-grade quality systems.
The PDZ-B-Q series targets automotive and industrial voltage regulation needs, delivering AEC-Q101-qualified Zener diodes optimized for space-constrained SMD designs requiring precision, low leakage, and thermal resilience.
FAQ
What is the maximum reverse current specification for PDZ4.3B-QF at 3.4 V?
The maximum reverse current (IR) is 3 µA at VR = 3.4 V and Tj = 25 °C, as specified in Table 8 of the datasheet. This value reflects worst-case leakage under rated conditions and is critical for low-power biasing applications where quiescent current must remain below 10 µA.
Can PDZ4.3B-QF be used in place of PDZ4.3B without modification?
Yes-PDZ4.3B-QF is the AEC-Q101-qualified variant of PDZ4.3B, sharing identical electrical characteristics, pinout, and SOD323 package. The "QF" suffix denotes automotive qualification; no layout or schematic changes are needed for drop-in replacement in qualified designs.
What is the thermal resistance from junction to solder point (Rth(j-sp)) for PDZ4.3B-QF?
Rth(j-sp) is 130 K/W in free air, measured from junction to solder point on an FR4 PCB with standard footprint and single-sided copper. This value enables accurate thermal modeling when estimating junction temperature rise above board temperature during continuous operation.
How does the temperature coefficient affect regulation accuracy over −40 °C to +125 °C?
With SZ = −2.5 mV/K at IZ = 5 mA, VZ shifts approximately −375 mV across the full range. Combined with initial ±2 % tolerance (±86 mV), total variation is ±461 mV-within acceptable bounds for non-critical reference applications such as overvoltage clamping and basic feedback regulation.
PDZ4.3B-QF 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:
- Obsolete
- 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-QF FAQ
1.How can I place an order for PDZ4.3B-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for PDZ4.3B-QF 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-QF reliable?
The price and inventory of PDZ4.3B-QF 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-QF is usually 5 days.
3.What payment methods are accepted for PDZ4.3B-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDZ4.3B-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PDZ4.3B-QF?
PDZ4.3B-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDZ4.3B-QF 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-QF?
For technical support, including PDZ4.3B-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDZ4.3B-QF requirements.
6.How does Aetrix verify that PDZ4.3B-QF is sourced from the original manufacturer or authorized distributors?
All PDZ4.3B-QF 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-QF meets industry standards.
7.What is the process for return or replacement of PDZ4.3B-QF?
All PDZ4.3B-QF units undergo pre-shipment inspection (PSI). If there is an issue with PDZ4.3B-QF, 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-QF part is unused and in its original packaging.
Return procedure for PDZ4.3B-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PDZ4.3B-QF Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
