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Nexperia USA Inc. BZT5250H-B18X
- Part No.:
- BZT5250H-B18X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT5250H-B18X.pdf
- Description:
- DIODE ZENER 18V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:3,961
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Product details
Overview
BZT5250H-B18X from Nexperia is a low-current Zener diode in SOD123F package, rated for 18 V nominal Zener voltage at 50 µA test current, with ±2 % tolerance, 830 mW total power dissipation, and 13.6 mV/K temperature coefficient - used for precision voltage reference and biasing in portable battery-powered sensor nodes and low-power microcontroller reset circuits.
For engineers reviewing the BZT5250H-B18X datasheet, BZT5250H-B18X pinout, BZT5250H-B18X application, or BZT5250H-B18X equivalent, this page delivers verified electrical characteristics, thermal resistance data, cathode/anode terminal mapping, and validated alternative Zeners for low-bias voltage regulation design.
Technical Context
This Zener operates in reverse breakdown with specified VZ = 17.1 V to 18.9 V at IZ = 50 µA, exhibiting differential resistance ≤225 Ω at IZ = 5 mA and junction-to-ambient thermal resistance of 330 K/W on FR4 PCB. Its intentional minor leakage rise improves switching speed and noise performance per AN90031.
The device features low forward voltage (≤0.9 V at 10 mA), non-repetitive peak reverse power capability up to 40 W for 100 µs pulses, and stable operation across –55 °C to +150 °C ambient range - optimized for space-constrained, low-quiescent-current regulation where precision and thermal predictability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.1 V to 18.9 V at IZ = 50 µA - defines tight regulation window for 18 V reference applications |
| Tolerance | ±2 % - enables high-accuracy biasing without post-production trimming |
| Differential Resistance (rdiff) | ≤225 Ω at IZ = 5 mA - ensures minimal output voltage shift under load variation |
| Temperature Coefficient (SZ) | +13.6 mV/K - provides predictable, positive drift for temperature-compensated designs |
| Total Power Dissipation (Ptot) | 830 mW at Tamb ≤ 25 °C - supports continuous operation with standard PCB copper pad layout |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - minimizes conduction loss when used in dual-direction protection or clamp configurations |
| Junction-to-Ambient Rth | 330 K/W - informs thermal derating requirements for sustained 18 V regulation in enclosed 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 for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased configuration enables Zener breakdown regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current specification | Rated at 50 µA - enables stable regulation in µA-level bias networks common in IoT sensor sleep modes |
| Optimized leakage behavior | Intentional minor IR rise per AN90031 - reduces switching transients and broadband noise in feedback paths |
| High-precision tolerance | ±2 % VZ - eliminates need for external trimming in factory-calibrated voltage references |
| Thermally robust SOD123F | 1 cm² cathode pad thermal path - delivers 830 mW dissipation without forced cooling in industrial control modules |
| Fast transient response | Capacitance ≤70 pF at VR = 0 V - maintains stability in high-frequency LDO feedback or ADC reference decoupling |
Applications
| Industrial Sensor Biasing | Microcontroller Reset Reference |
|---|---|
|
Use Scenario: Providing stable 18 V bias to analog front-end op-amps in wireless temperature transmitters operating on coin-cell batteries. IC Role / Device Role / Timing Role: Zener diode acting as low-current voltage reference source for signal conditioning circuitry. Use Value: ±2 % tolerance and 13.6 mV/K coefficient allow predictable offset calibration across –40 °C to +85 °C operating range without software compensation. |
Use Scenario: Generating precise 18 V threshold for external reset supervisor ICs monitoring 18 V system rails in programmable logic controllers. IC Role / Device Role / Timing Role: Precision voltage reference defining reset assertion level for power-on sequencing. Use Value: Differential resistance ≤225 Ω ensures minimal hysteresis-induced timing jitter during brown-out detection transitions. |
| Portable Medical Device Reference | Low-Power ADC Voltage Reference |
|
Use Scenario: Supplying reference voltage to ultra-low-power analog switches in handheld ECG electrode interface modules. IC Role / Device Role / Timing Role: Low-leakage Zener regulating bias for CMOS analog multiplexers during standby. Use Value: 50 µA test current rating matches typical quiescent current of medical SoCs, avoiding unnecessary battery drain. |
Use Scenario: Stabilizing reference input to 12-bit SAR ADCs in battery-operated environmental monitors. IC Role / Device Role / Timing Role: Voltage reference element maintaining ADC full-scale accuracy under varying supply conditions. Use Value: 70 pF capacitance and fast recovery minimize reference settling time, enabling 10 kSPS sampling without added buffer delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT5250H-C18 | ±5 % tolerance, identical VZ range (17.1–18.9 V), same SOD123F package | Lower cost for non-critical biasing where ±2 % is not required | Select when absolute voltage accuracy is secondary to BOM simplification across multiple Zener values |
| MMSZ5245B-TP | 18 V nominal, ±5 %, SOD-123 package, 500 mW Ptot, higher rdiff (≤300 Ω) | Higher thermal resistance (400 K/W) limits power handling on minimal PCB copper | Choose only if legacy design reuse mandates Diodes Inc. footprint compatibility and 500 mW suffices |
Compared with BZT5250H-B18X, the C18 variant trades precision for cost in non-critical biasing, while MMSZ5245B-TP offers cross-manufacturer footprint alignment at reduced thermal performance and looser regulation - making BZT5250H-B18X optimal for new designs demanding ±2 % accuracy and 830 mW capability in compact SOD123F layouts.
Availability
BZT5250H-B18X is available at Aetrix Electronics and suitable for industrial sensor biasing, microcontroller reset reference, and portable medical device reference requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for BZT5250H-B18X 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, miniaturization, and sustainability.
The BZT5250H series belongs to Nexperia's low-current Zener portfolio, engineered specifically for precision voltage regulation in battery-constrained and thermally sensitive applications - emphasizing tight tolerance, low test current operation, and optimized noise behavior.
FAQ
What is the maximum continuous reverse power dissipation for BZT5250H-B18X at 70 °C ambient?
At Tamb = 70 °C, derating applies linearly from 830 mW at 25 °C using Rth(j-a) = 330 K/W. Junction temperature must stay ≤150 °C, so allowable Ptot = (150 − 70) °C / 330 K/W ≈ 242 mW. This value assumes standard FR4 PCB mounting with single-sided copper and tin plating.
Does BZT5250H-B18X support bidirectional ESD protection?
No - BZT5250H-B18X is a unidirectional Zener diode optimized for reverse-bias regulation. It lacks symmetric clamping characteristics and specified ESD ratings. For bidirectional protection, use dedicated TVS arrays like PESD5V0S1BA or transient voltage suppressors with defined ±VBR.
Can BZT5250H-B18X replace BZX84-C18 in existing SOT-23 designs?
No - BZT5250H-B18X uses SOD123F (2.6 × 1.6 mm), while BZX84-C18 uses SOT-23 (3.0 × 1.4 mm). Footprint, thermal path, and anode/cathode pin orientation differ. Direct replacement requires PCB redesign and validation of thermal performance under 830 mW loading.
What is the typical reverse leakage current at 15 V reverse bias and 25 °C?
Per Table 8, for BZT5250H-B18X (18 V nominal), reverse current IR is ≤0.05 µA at VR = 15 V and Tj = 25 °C. This ultra-low leakage preserves battery life in always-on monitoring circuits and avoids loading high-impedance reference nodes.
BZT5250H-B18X 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:
- ±2%
- 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-B18X FAQ
1.How can I place an order for BZT5250H-B18X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT5250H-B18X 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-B18X reliable?
The price and inventory of BZT5250H-B18X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT5250H-B18X is usually 5 days.
3.What payment methods are accepted for BZT5250H-B18X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT5250H-B18X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT5250H-B18X?
BZT5250H-B18X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT5250H-B18X 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-B18X?
For technical support, including BZT5250H-B18X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT5250H-B18X requirements.
6.How does Aetrix verify that BZT5250H-B18X is sourced from the original manufacturer or authorized distributors?
All BZT5250H-B18X 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-B18X meets industry standards.
7.What is the process for return or replacement of BZT5250H-B18X?
All BZT5250H-B18X units undergo pre-shipment inspection (PSI). If there is an issue with BZT5250H-B18X, 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-B18X part is unused and in its original packaging.
Return procedure for BZT5250H-B18X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT5250H-B18X Tags
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MM5Z5V1ST1G
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