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Nexperia USA Inc. BZT52H-A43X
- Part No.:
- BZT52H-A43X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-A43X.pdf
- Description:
- DIODE ZENER 43V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:6,832
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Product details
Overview
BZT52H-A43X from Nexperia is a precision Zener voltage regulator diode in SOD123F package, designed for stable reference and overvoltage protection in low-power circuits. It delivers 43 V nominal Zener voltage at 2 mA test current, ±1 % tolerance, 325 Ω maximum differential resistance, and supports up to 830 mW total power dissipation at 25 °C ambient.
For engineers reviewing the BZT52H-A43X datasheet, BZT52H-A43X pinout, BZT52H-A43X application, or BZT52H-A43X equivalent, key selection criteria include its tight 43 V regulation accuracy, low temperature coefficient (±0.05 mV/K), SOD123F surface-mount compatibility, and suitability for voltage clamping in power supply feedback loops and sensor biasing networks.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified 43 V working voltage at IZ = 2 mA, exhibiting a typical temperature coefficient of ±0.05 mV/K and maximum differential resistance of 325 Ω. Its non-repetitive peak reverse current is rated at 0.6 A under 100 μs pulse conditions.
The device uses silicon PN-junction technology in a planar construction, optimized for stable DC voltage reference generation and transient overvoltage suppression. Thermal resistance from junction to ambient is 330 K/W on standard FR4 PCB, enabling reliable operation up to 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 43 V nominal at IZ = 2 mA; defines precise regulation point for feedback or reference circuits |
| Tolerance | ±1 %; ensures tight voltage accuracy critical for high-precision analog sensing and power supply trimming |
| Differential Resistance (rdif) | ≤ 325 Ω; limits output impedance variation under load changes, improving regulation stability |
| Total Power Dissipation (Ptot) | 830 mW at Tamb ≤ 25 °C; sets maximum continuous DC power handling on standard FR4 PCB |
| Forward Voltage (VF) | ≤ 0.9 V at IF = 10 mA; enables predictable forward conduction for dual-direction protection schemes |
| Reverse Current (IR) | ≤ 0.1 μA at VR = 34.4 V; guarantees minimal leakage below breakdown, preserving signal integrity |
| Thermal Resistance (Rth(j-a)) | 330 K/W; determines junction temperature rise per watt, guiding thermal design on standard layout |
Pinout & Package
SOD123F is a small-outline, flat-lead, surface-mounted plastic package measuring 3.6 mm × 1.7 mm × 1.0 mm, optimized for automated placement and reflow soldering on FR4 PCBs with single-sided copper and tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to higher-potential node in reverse-bias configuration; marked by cathode bar on package body |
| 2 | Anode (A) | Connected to lower-potential node; completes reverse-bias path for Zener conduction and voltage clamping |
Key Features
| Feature | Design Value |
|---|---|
| High-precision regulation | ±1 % tolerance at 43 V enables accurate voltage references without external trimming |
| Low temperature drift | ±0.05 mV/K coefficient minimizes voltage shift across -65 °C to +150 °C operating range |
| Robust surge capability | 0.6 A non-repetitive peak reverse current supports transient suppression in industrial interfaces |
| Compact SMD footprint | SOD123F package occupies only 6.1 mm² board area, ideal for space-constrained power rails |
| Controlled thermal performance | 150 K/W junction-to-solder-point resistance allows effective heat transfer via cathode pad |
Applications
| Power Supply Feedback Loop | Sensor Bias Reference |
|---|---|
Use Scenario: Stabilizing output voltage in isolated flyback or buck-derived auxiliary supplies. IC Role / Device Role / Timing Role: Zener diode provides precise 43 V reference for optocoupler-based feedback network. Use Value: Tight ±1 % tolerance maintains ±0.5 % output regulation accuracy across line/load variations. |
Use Scenario: Supplying stable excitation voltage to resistive temperature detectors (RTDs) or strain gauges. IC Role / Device Role / Timing Role: Acts as low-drift voltage source for ratiometric measurement circuits. Use Value: ±0.05 mV/K temperature coefficient limits reference drift to <0.25 mV over 50 °C ambient swing. |
| Overvoltage Clamp Circuit | Microcontroller I/O Protection |
Use Scenario: Protecting downstream analog inputs from accidental 48 V bus transients in industrial control modules. IC Role / Device Role / Timing Role: Shunts excess energy above 43 V to ground during surge events. Use Value: 0.6 A peak reverse current rating handles 100 μs surges without degradation. |
Use Scenario: Safeguarding 3.3 V or 5 V MCU GPIO pins against ESD and miswiring in field-deployed equipment. IC Role / Device Role / Timing Role: Clamps fast-rising faults to safe levels before internal protection diodes activate. Use Value: 325 Ω differential resistance ensures clamp voltage stays within 43.5 V at 10 mA fault current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52H-B43 | ±2 % tolerance; 325 Ω rdif; same 43 V nominal, higher max IR (0.2 μA) | Acceptable where ±2 % regulation accuracy suffices and cost sensitivity is higher | Select when tighter tolerance is not required and BOM cost optimization is prioritized |
| BZX84-C43 | SOT-23 package; ±5 % tolerance; 600 Ω rdif; 300 mW Ptot | Lower power handling and looser tolerance limit use to non-critical biasing only | Choose only for legacy SOT-23 footprints where board redesign is prohibited |
Compared with BZT52H-B43 and BZX84-C43, the BZT52H-A43X offers superior voltage accuracy and thermal robustness, making it the preferred choice for precision feedback and industrial-grade protection where long-term stability and repeatability are mandatory.
Availability
BZT52H-A43X is available at Aetrix Electronics and suitable for power supply feedback loops, sensor bias references, overvoltage clamp circuits, and microcontroller I/O protection requiring stable component supply and consistent parametric performance across production batches.
Supply support for BZT52H-A43X 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 solutions, headquartered in Nijmegen, Netherlands.
The BZT52H series belongs to Nexperia's general-purpose Zener diode product line, engineered specifically for stable voltage reference and overvoltage protection in consumer, industrial, and computing applications where compact size and parametric consistency are essential.
FAQ
What is the Zener test current for BZT52H-A43X?
The BZT52H-A43X is characterized at 2 mA Zener test current (IZ), as confirmed in Table 9 of the official Nexperia datasheet Rev. 7. This current level ensures stable breakdown voltage measurement while minimizing self-heating effects, and is used to specify the 43 V nominal voltage and ±1 % tolerance.
Can BZT52H-A43X be used in automotive applications?
No - the BZT52H-A43X is explicitly designated as non-automotive qualified per Nexperia's revision history (Rev. 7, January 2023). It lacks AEC-Q200 qualification and has not undergone automotive-grade stress testing. For automotive use, Nexperia recommends its -Q qualified alternatives, such as the BZT52H-Q series.
What is the maximum allowable reverse voltage before breakdown?
The maximum reverse voltage before reaching the specified Zener breakdown is 34.4 V, defined as the voltage at which reverse current reaches 0.1 μA (IR ≤ 0.1 μA). This value is derived from the "Reverse current IR" column in Table 9 for the BZT52H-A43X entry, ensuring safe operation below conduction threshold.
How does the SOD123F package affect thermal performance?
The SOD123F package delivers Rth(j-sp) = 150 K/W (junction-to-solder-point), meaning the cathode pad serves as the primary thermal path. With a 1 cm² mounting pad, junction temperature rise is limited to 124.5 °C at full 830 mW dissipation - well within the 150 °C absolute maximum - enabling reliable operation without heatsinking in standard layouts.
BZT52H-A43X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZT52H
- Package/Case:
- SOD-123F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±1%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 30.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
BZT52H-A43X FAQ
1.How can I place an order for BZT52H-A43X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-A43X 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 BZT52H-A43X reliable?
The price and inventory of BZT52H-A43X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52H-A43X is usually 5 days.
3.What payment methods are accepted for BZT52H-A43X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-A43X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-A43X?
BZT52H-A43X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-A43X 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 BZT52H-A43X?
For technical support, including BZT52H-A43X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-A43X requirements.
6.How does Aetrix verify that BZT52H-A43X is sourced from the original manufacturer or authorized distributors?
All BZT52H-A43X 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 BZT52H-A43X meets industry standards.
7.What is the process for return or replacement of BZT52H-A43X?
All BZT52H-A43X units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-A43X, 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 BZT52H-A43X part is unused and in its original packaging.
Return procedure for BZT52H-A43X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT52H-A43X Tags
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MM5Z5V1ST1G
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