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Nexperia USA Inc. BZT52H-B18,115
- Part No.:
- BZT52H-B18,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-B18,115.pdf
- Description:
- DIODE ZENER 18V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:831
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Product details
Overview
BZT52H-B18,115 from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD123F package, rated for 18 V nominal breakdown voltage at IZ = 5 mA, with 830 mW total power dissipation and 170 Ω maximum differential resistance. It serves as a precision reference or overvoltage clamp in low-power DC supply rails and signal-level voltage stabilization circuits.
For engineers reviewing the BZT52H-B18,115 datasheet, BZT52H-B18,115 pinout, BZT52H-B18,115 application, or BZT52H-B18,115 equivalent, this page delivers verified electrical specs, thermal behavior, cathode/anode terminal mapping, real-world regulation use cases, and validated alternative parts for design-in flexibility.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain stable voltage across its terminals under varying load or input conditions. Its ±2 % tolerance ensures tighter regulation than standard ±5 % Zeners, while the SOD123F package enables high-density PCB layouts with reliable thermal conduction via cathode pad.
It exhibits a positive temperature coefficient of +12.6 mV/K at IZ = 5 mA, enabling predictable drift compensation in multi-diode references. Reverse current remains ≤0.05 μA at VR = 14.4 V, supporting low-leakage bias networks in precision analog stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VZ) | 17.6 V to 18.4 V at IZ = 5 mA - defines regulated output voltage window under nominal test condition |
| Differential Resistance (rdif) | ≤170 Ω - determines regulation stiffness; lower values yield smaller output voltage shift per load current change |
| Total Power Dissipation (Ptot) | 830 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on FR4 PCB with 1 cm² cathode pad |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - limits forward conduction loss when used bidirectionally or in protection clamps |
| Reverse Current (IR) | ≤0.05 μA at VR = 14.4 V - ensures minimal quiescent leakage in high-impedance reference nodes |
| Temperature Coefficient (SZ) | +12.6 mV/K at IZ = 5 mA - quantifies voltage drift per degree Celsius rise, critical for temperature-stable references |
| Junction-to-Ambient Rth | 330 K/W - indicates thermal resistance in free air, guiding derating curves for elevated ambient temperatures |
Pinout & Package
SOD123F surface-mount plastic package: 2-terminal, flat lead, small outline (3.6 mm × 1.7 mm × 1.0 mm), 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; primary heat path to PCB pad |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-bias polarity required for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % voltage tolerance | Enables tighter regulation than ±5 % Zeners, reducing need for post-regulation trimming in mid-precision supplies |
| 830 mW power rating | Supports up to ~46 mA Zener current at 18 V, sufficient for biasing op-amp references or driving small logic inputs |
| SOD123F footprint | Compatible with standard reflow soldering; 1.2 mm pitch allows dense placement without thermal crosstalk |
| +12.6 mV/K tempco | Allows predictable compensation when paired with negative-tempco components (e.g., transistors) in bandgap-like references |
| ≤0.05 μA leakage @ 14.4 V | Maintains accuracy in high-impedance divider networks where leakage would otherwise cause significant error |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulators or DC-DC converter error amplifiers. IC Role / Device Role / Timing Role: Provides fixed 18 V reference point for comparator threshold or error amplifier setpoint. Use Value: Maintains ±2 % output accuracy across temperature and line variations, reducing need for external calibration. |
Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events on sensor lines. IC Role / Device Role / Timing Role: Shunts excess energy above 18.4 V to ground before damage occurs. Use Value: Limits clamping voltage to 18.4 V with <170 Ω dynamic impedance, minimizing stress on downstream ESD structures. |
| Signal-Level Biasing | Low-Power Voltage Monitor |
Use Scenario: Generating stable bias voltages for op-amp input stages in battery-powered instrumentation. IC Role / Device Role / Timing Role: Supplies clean 18 V reference to high-impedance virtual ground or level-shift network. Use Value: Delivers ≤0.05 μA leakage and +12.6 mV/K drift, preserving offset stability in µV-level measurements. |
Use Scenario: Detecting brown-out conditions in 24 V industrial control modules. IC Role / Device Role / Timing Role: Feeds regulated 18 V to comparator input; drop below 17.6 V triggers reset signal. Use Value: Enables detection window of 0.8 V (17.6–18.4 V) with known tolerance, eliminating need for adjustable potentiometer. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52C18,115 | ±5 % tolerance (17.1–18.9 V), higher max rdif (220 Ω), same SOD123F package | Acceptable where looser regulation suffices; lower cost for non-critical biasing | Select when budget constraints outweigh precision requirements and thermal derating margin exists |
| MMSZ5245B-TP | ±5 % tolerance (17.1–18.9 V), 500 mW Ptot, SOD-123 package (identical mechanical outline) | Lower power rating limits Zener current to ~28 mA; suitable only for light-load references | Choose only if board space matches and thermal budget permits reduced dissipation |
Compared with BZT52H-B18,115, the BZT52C18,115 trades precision for cost and the MMSZ5245B-TP sacrifices power headroom for second-source availability-neither offers the 830 mW capability and ±2 % tightness needed for robust 18 V regulation under variable load.
Availability
BZT52H-B18,115 is available at Aetrix Electronics and suitable for power supply reference, overvoltage clamp, and signal-level biasing applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for BZT52H-B18,115 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 and industrial-grade components.
The BZT52H series belongs to Nexperia's general-purpose Zener diode product line, engineered for stable voltage regulation in consumer, industrial, and computing power management systems where precision, compact size, and thermal efficiency are essential.
FAQ
What is the maximum continuous Zener current for BZT52H-B18,115 at 25 °C ambient?
At Tamb = 25 °C with proper PCB copper area (1 cm² cathode pad), the device supports up to 46.1 mA continuous Zener current (830 mW ÷ 18 V). Derating is required above 25 °C using the 330 K/W junction-to-ambient thermal resistance.
Can BZT52H-B18,115 be used in series for higher voltage references?
Yes-its ±2 % tolerance and matched temperature coefficient (+12.6 mV/K) allow predictable stacking. Two units yield 35.2–36.8 V with ±2.8 % combined tolerance; thermal tracking minimizes drift-induced error in multi-diode references.
Is the SOD123F package compatible with standard reflow profiles?
Yes-the SOD123F package is qualified for lead-free reflow soldering per J-STD-020. The recommended profile uses peak temperature ≤260 °C for ≤30 seconds, with ramp rates matching IPC-7095 guidelines for plastic SMD packages.
How does the 170 Ω differential resistance affect regulation accuracy under load?
With 170 Ω rdif, a 1 mA change in Zener current causes ~170 mV output shift. For example, a 5 mA to 6 mA load step increases VZ by 170 mV-designers must account for this in feedback loop gain or add buffering for sensitive loads.
BZT52H-B18,115 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):
- 18 V
- Tolerance:
- ±2%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 12.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
BZT52H-B18,115 FAQ
1.How can I place an order for BZT52H-B18,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-B18,115 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-B18,115 reliable?
The price and inventory of BZT52H-B18,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52H-B18,115 is usually 5 days.
3.What payment methods are accepted for BZT52H-B18,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-B18,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-B18,115?
BZT52H-B18,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-B18,115 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-B18,115?
For technical support, including BZT52H-B18,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-B18,115 requirements.
6.How does Aetrix verify that BZT52H-B18,115 is sourced from the original manufacturer or authorized distributors?
All BZT52H-B18,115 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-B18,115 meets industry standards.
7.What is the process for return or replacement of BZT52H-B18,115?
All BZT52H-B18,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-B18,115, 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-B18,115 part is unused and in its original packaging.
Return procedure for BZT52H-B18,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT52H-B18,115 Tags
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