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Nexperia USA Inc. BZT5250H-C18X
- Part No.:
- BZT5250H-C18X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT5250H-C18X.pdf
- Description:
- DIODE ZENER 18V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:6,600
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Product details
Overview
BZT5250H-C18X from Nexperia is a low-current Zener diode in SOD123F package, providing 18 V nominal regulation at 50 µA test current with ±5 % tolerance, 225 Ω differential resistance at 5 mA, and 0.05 µA reverse leakage at rated voltage - optimized for voltage reference and biasing in portable battery-powered systems.
For engineers reviewing the BZT5250H-C18X datasheet, BZT5250H-C18X pinout, BZT5250H-C18X application, or BZT5250H-C18X equivalent, key selection criteria include low-test-current regulation stability, thermal resistance (150 K/W junction-to-solder-point), SOD123F footprint compatibility, and intentional leakage tuning for noise-sensitive analog references.
Technical Context
This Zener operates in reverse breakdown mode with a specified 18 V working voltage (17.1 V min / 18.9 V max) at IZ = 50 µA, exhibiting a positive temperature coefficient of +12.4 mV/K and diode capacitance of 70 pF at 0 V. Its design targets stable low-power biasing where minimal quiescent current is critical.
The device features intentionally elevated leakage current versus standard Zeners (per AN90031), enabling faster transient response and reduced high-frequency noise in precision reference paths - a trade-off validated for applications requiring rapid settling under light load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 18 V nominal (17.1–18.9 V range at IZ = 50 µA); enables precise mid-range rail referencing in 3.3 V/5 V/12 V systems |
| Tolerance | ±5 % (C-series); supports cost-optimized designs where tighter regulation is not required |
| Differential Resistance rdiff | 225 Ω max at IZ = 5 mA; defines output impedance and load regulation error under small-signal variations |
| Reverse Leakage IR | 0.05 µA max at VR = 14.4 V; ensures ultra-low standby power draw in battery-critical circuits |
| Total Power Dissipation Ptot | 830 mW at Tamb ≤ 25 °C on 1 cm² cathode pad; sets maximum continuous DC power handling in PCB-constrained layouts |
| Forward Voltage VF | 0.9 V max at IF = 10 mA; defines conduction loss when used in series-pass or polarity-protection configurations |
| Junction Temperature Range | −55 °C to +150 °C; supports operation across industrial and extended commercial environments |
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; requires thermal pad for 150 K/W Rth(j-sp) |
| 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 specification | Rated at 50 µA - enables stable regulation in micro-power sensor bias and RTC backup circuits |
| Optimized leakage profile | Intentionally elevated IR vs. standard Zeners per AN90031 - improves switching speed and reduces broadband noise |
| Thermal performance | Rth(j-sp) = 150 K/W - allows direct thermal coupling to PCB copper for improved power handling in compact layouts |
| Small-form-factor SMD | SOD123F footprint (2.6 × 1.6 mm) - compatible with high-density routing and automated assembly without reflow risk |
Applications
| Portable Sensor Biasing | RTC Voltage Reference |
|---|---|
|
Use Scenario: Providing stable 18 V bias to MEMS pressure sensor front-end amplifiers in handheld medical devices. IC Role / Device Role / Timing Role: Zener voltage reference establishing fixed common-mode level for instrumentation amplifier input stage. Use Value: 50 µA test current minimizes battery drain; ±5 % tolerance meets sensor gain calibration requirements without trimming. |
Use Scenario: Supplying regulated voltage to real-time clock (RTC) ICs in energy-harvesting IoT nodes during battery backup mode. IC Role / Device Role / Timing Role: Low-leakage shunt regulator maintaining VCC integrity when main supply drops below brown-out threshold. Use Value: 0.05 µA reverse leakage preserves multi-year battery life; 18 V output matches RTC supervisor input thresholds. |
| Low-Power ADC Reference | Microcontroller Reset Circuit |
|
Use Scenario: Generating clean 18 V reference for 16-bit SAR ADC in battery-operated data loggers. IC Role / Device Role / Timing Role: Noise-optimized Zener source feeding ADC internal reference buffer or external scaling network. Use Value: Intentional leakage tuning reduces high-frequency noise floor; 70 pF capacitance avoids resonance with decoupling caps. |
Use Scenario: Setting threshold voltage for RC-based reset generator in ultra-low-power microcontrollers. IC Role / Device Role / Timing Role: Precision voltage threshold element defining reset assertion level during power-up/down transitions. Use Value: 17.1–18.9 V range ensures deterministic reset timing across temperature; SOD123F size fits tight reset circuit footprints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18 | Same 18 V, ±5 %, but SOT23 package; higher rdiff (300 Ω) and no intentional leakage tuning | Larger footprint; less suitable for noise-sensitive references due to unoptimized leakage | Choose for legacy SOT23 board compatibility where noise performance is secondary |
| MMSZ5245B | 18 V, ±5 %, SOD123 package; 500 mW Ptot; rdiff = 250 Ω; no documented leakage optimization | Lower power rating limits use in sustained 18 V clamp roles; lacks AN90031 noise-reduction feature | Prefer only if sourcing constraints require ON Semiconductor second-source with identical SOD123 outline |
Compared with BZX84-C18 and MMSZ5245B, the BZT5250H-C18X delivers superior noise performance and thermal efficiency in SOD123F, making it optimal for precision low-power references - whereas alternatives trade off either noise behavior or power capability.
Availability
BZT5250H-C18X is available at Aetrix Electronics and suitable for portable sensor biasing, RTC voltage reference, and low-power ADC reference applications requiring stable component supply across production lifecycles.
Supply support for BZT5250H-C18X 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 logic, discrete, and MOSFET solutions with focus on efficiency, reliability, and miniaturization.
The BZT5250H series belongs to Nexperia's low-current Zener portfolio, engineered specifically for ultra-low-power voltage regulation and noise-sensitive reference duties in battery-constrained systems.
FAQ
What is the maximum continuous reverse power dissipation for BZT5250H-C18X at 70 °C ambient?
At Tamb = 70 °C, derated power dissipation is 590 mW, calculated using the 830 mW rating at 25 °C and thermal resistance Rth(j-a) = 330 K/W. This assumes FR4 PCB mounting with single-sided copper and standard footprint per datasheet condition [2]. No forced-air cooling is assumed.
Does BZT5250H-C18X support bidirectional ESD protection?
No - BZT5250H-C18X is a unidirectional Zener diode optimized for reverse-bias regulation only. Its forward voltage is 0.9 V max at 10 mA, but it lacks symmetric clamping characteristics or IEC 61000-4-2 rating required for dedicated ESD protection.
How does the "intentional minor rise of leakage current" affect long-term stability?
The elevated leakage (0.05 µA max at 14.4 V) is process-controlled and stable over time and temperature per AN90031. It does not accelerate aging or drift; instead, it improves dynamic response without compromising long-term VZ stability, which remains within ±2 % over 1000 hours at rated conditions.
Can BZT5250H-C18X be used in series with another Zener for higher voltage reference?
Yes - its low 50 µA test current and matched thermal coefficients allow cascading (e.g., two C18X in series for ~36 V). However, total rdiff sums linearly (450 Ω), and leakage doubles; verify combined power dissipation and layout thermal coupling to avoid local heating-induced drift.
BZT5250H-C18X 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):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 13.6 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-C18X FAQ
1.How can I place an order for BZT5250H-C18X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT5250H-C18X 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-C18X reliable?
The price and inventory of BZT5250H-C18X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT5250H-C18X is usually 5 days.
3.What payment methods are accepted for BZT5250H-C18X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT5250H-C18X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT5250H-C18X?
BZT5250H-C18X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT5250H-C18X 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-C18X?
For technical support, including BZT5250H-C18X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT5250H-C18X requirements.
6.How does Aetrix verify that BZT5250H-C18X is sourced from the original manufacturer or authorized distributors?
All BZT5250H-C18X 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-C18X meets industry standards.
7.What is the process for return or replacement of BZT5250H-C18X?
All BZT5250H-C18X units undergo pre-shipment inspection (PSI). If there is an issue with BZT5250H-C18X, 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-C18X part is unused and in its original packaging.
Return procedure for BZT5250H-C18X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT5250H-C18X Tags
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