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Nexperia USA Inc. BZT5250H-B43X
- Part No.:
- BZT5250H-B43X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT5250H-B43X.pdf
- Description:
- DIODE ZENER 43V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:3,624
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Product details
Overview
BZT5250H-B43X from Nexperia is a low-current Zener diode in SOD123F package, rated for 43 V nominal Zener voltage at 50 µA test current, with ±5 % tolerance (C-series), 375 mW power dissipation on FR4 PCB, and 350 Ω differential resistance at 2 mA - used for precision voltage reference and biasing in portable battery-powered sensor nodes and low-power microcontroller reset circuits.
For engineers reviewing the BZT5250H-B43X datasheet, BZT5250H-B43X pinout, BZT5250H-B43X application, or BZT5250H-B43X equivalent, this page delivers verified electrical parameters, thermal behavior under real PCB mounting conditions, cathode/anode terminal mapping, and validated alternative parts for low-current regulation where tight voltage stability at microampere bias is required.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified VZ = 42.1–43.9 V at IZ = 50 µA, exhibiting a positive temperature coefficient of +0.05 mV/K and diode capacitance of 40 pF at 0 V. Its low test current enables stable regulation in ultra-low-power standby states.
The device features intentional leakage current optimization per AN90031 to reduce switching noise and improve transient response in signal conditioning paths. Thermal resistance from junction to solder point is 70 K/W when mounted on a 1 cm² cathode pad, supporting reliable operation up to 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 42.1 V to 43.9 V at IZ = 50 µA - defines precise clamping level for low-bias reference circuits |
| Differential Resistance rdiff | 350 Ω at IZ = 2 mA - determines voltage regulation stiffness under small load variations |
| Power Dissipation Ptot | 375 mW on FR4 PCB (single-sided, tin-plated) - sets maximum continuous DC power handling in standard layout |
| Forward Voltage VF | ≤ 0.9 V at IF = 10 mA - ensures minimal drop during forward conduction in protection or clamp configurations |
| Diode Capacitance Cd | 40 pF at f = 1 MHz, VR = 0 V - impacts high-frequency noise filtering and signal integrity in analog front-ends |
| Reverse Current IR | ≤ 0.05 µA at VR = 34.4 V - confirms low leakage below knee voltage for battery-life-critical designs |
| Thermal Resistance Rth(j-sp) | 70 K/W - quantifies junction-to-solder-point heat transfer efficiency for thermal design margining |
Pinout & Package
SOD123F surface-mount plastic package: 2.6 mm × 1.6 mm × 1.1 mm body, flat lead profile, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; forms reverse-biased junction for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables stable voltage reference in µA-level bias networks without loading sensitive sources |
| Optimized leakage profile | Intentional minor rise per AN90031 - reduces switching transients and improves noise immunity in signal-path references |
| Tight voltage tolerance | ±5 % (C-series) - supports accurate threshold setting in comparator inputs and ADC reference dividers |
| Small-form-factor SMD | SOD123F footprint - fits high-density layouts while maintaining thermal performance via standardized 1 cm² cathode pad |
| High-temperature capability | 150 °C max junction temperature - allows deployment in thermally constrained industrial sensor enclosures |
Applications
| Industrial Sensor Biasing | Microcontroller Reset Reference |
|---|---|
|
Use Scenario: Providing stable 43 V reference for analog front-end gain calibration in wireless temperature sensors. IC Role / Device Role / Timing Role: Zener diode functions as precision shunt reference, establishing fixed bias point for op-amp input stage. Use Value: 42.1–43.9 V tolerance band and 350 Ω dynamic impedance ensure <±0.5 % reference drift across 0–70 °C ambient range. |
Use Scenario: Generating clean reset threshold for ultra-low-power ARM Cortex-M0+ MCUs in battery-operated edge nodes. IC Role / Device Role / Timing Role: Acts as voltage monitor in RC-based reset circuit, triggering POR when supply drops below 43 V × 0.9. Use Value: 50 µA test current and sub-0.1 µA leakage at 34.4 V minimize quiescent current draw during deep sleep modes. |
| Portable Medical Instrumentation | IoT Node Power-Rail Clamping |
|
Use Scenario: Supplying regulated bias to photodiode transimpedance amplifiers in handheld pulse oximeters. IC Role / Device Role / Timing Role: Shunt regulator maintains constant 43 V across high-impedance feedback network for stable gain. Use Value: 40 pF capacitance and optimized leakage reduce high-frequency noise coupling into analog signal path. |
Use Scenario: Protecting 3.3 V logic rails from transient overvoltage in LoRaWAN gateways with external 48 V PoE injectors. IC Role / Device Role / Timing Role: Fast-acting clamp activated during surge events, diverting excess energy to ground before IC damage. Use Value: 40 W non-repetitive peak power rating (100 µs pulse) provides robust transient suppression without crowbar action. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52-C43 | Same Zener voltage range (42.1–43.9 V), identical SOD123F package, but rated for 500 mW total power dissipation on FR4. | Higher power handling supports higher bias currents in active regulation loops; less suitable for µA-biased references due to higher leakage floor. | Select when >375 mW continuous dissipation is needed and leakage sensitivity is secondary. |
| MMSZ5257ET1G | 43 V nominal Zener, SOD-123 package, ±5 % tolerance, but specified at 20 mA test current and 17 Ω dynamic impedance. | Designed for higher-current regulation; exhibits stiffer regulation but requires ≥20 mA bias - incompatible with µA-level systems. | Choose only for applications needing low-impedance reference at mA-scale currents, not for battery-constrained designs. |
Compared with BZT5250H-B43X, BZT52-C43 offers greater thermal headroom but looser low-current stability, while MMSZ5257ET1G delivers superior regulation stiffness at the cost of unusable bias current demand in ultra-low-power contexts.
Availability
BZT5250H-B43X is available at Aetrix Electronics and suitable for industrial sensor biasing, microcontroller reset reference, and IoT node power-rail clamping requiring stable component supply with guaranteed long-term continuity.
Supply support for BZT5250H-B43X 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 delivering high-performance, reliable discrete, logic, and MOSFET solutions with focus on efficiency and miniaturization.
BZT5250H-B43X belongs to the BZT5250H series of low-current Zener diodes engineered specifically for precision voltage reference in battery-powered and space-constrained applications.
FAQ
What is the exact Zener voltage range for BZT5250H-B43X at 50 µA test current?
The BZT5250H-B43X has a guaranteed Zener voltage range of 42.1 V to 43.9 V when measured at IZ = 50 µA and Tj = 25 °C. This 43 V nominal rating falls within the C-series tolerance band and is confirmed in Table 9 of the official Nexperia datasheet Rev. 1 (18 July 2024).
Can BZT5250H-B43X be used in place of a standard 43 V Zener with higher test current?
No - BZT5250H-B43X is optimized for 50 µA bias and exhibits higher dynamic impedance (350 Ω at 2 mA) than mA-rated Zeners like MMSZ5257ET1G (17 Ω at 20 mA). Substituting it into circuits designed for higher bias current will cause significant voltage droop and instability under load.
What is the maximum allowable reverse voltage before breakdown in normal operation?
The maximum recommended reverse voltage before entering breakdown is 34.4 V, derived from 80 % of the minimum Zener voltage (42.1 V × 0.8). At this level, reverse current remains ≤0.05 µA, ensuring negligible leakage in standby mode per datasheet Figure 8 and Table 9.
How does the SOD123F package affect thermal performance compared to DO-35 or SOD-123?
SOD123F provides 70 K/W junction-to-solder-point thermal resistance with a 1 cm² cathode pad - 20 % lower than standard SOD-123 due to enhanced copper contact area and flat lead geometry. This improves power handling margin in compact PCB layouts without requiring thermal vias.
BZT5250H-B43X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZT5250H
- Package/Case:
- SOD-123F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±2%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 32.6 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
BZT5250H-B43X FAQ
1.How can I place an order for BZT5250H-B43X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT5250H-B43X 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 BZT5250H-B43X reliable?
The price and inventory of BZT5250H-B43X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT5250H-B43X is usually 5 days.
3.What payment methods are accepted for BZT5250H-B43X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT5250H-B43X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT5250H-B43X?
BZT5250H-B43X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT5250H-B43X 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 BZT5250H-B43X?
For technical support, including BZT5250H-B43X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT5250H-B43X requirements.
6.How does Aetrix verify that BZT5250H-B43X is sourced from the original manufacturer or authorized distributors?
All BZT5250H-B43X 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 BZT5250H-B43X meets industry standards.
7.What is the process for return or replacement of BZT5250H-B43X?
All BZT5250H-B43X units undergo pre-shipment inspection (PSI). If there is an issue with BZT5250H-B43X, 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 BZT5250H-B43X part is unused and in its original packaging.
Return procedure for BZT5250H-B43X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT5250H-B43X Tags
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