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Nexperia USA Inc. BZT5250H-C18-QX
- Part No.:
- BZT5250H-C18-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT5250H-C18-QX.pdf
- Description:
- DIODE ZENER 18V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:5,656
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Product details
Overview
BZT5250H-C18-Q from Nexperia is a low-current Zener diode in SOD123F package, rated for 18 V nominal Zener voltage at 50 µA test current, with ±5 % tolerance, 830 mW total power dissipation, and AEC-Q101 qualification for automotive use - deployed in precision biasing and voltage reference circuits for battery-powered sensor nodes.
For engineers reviewing the BZT5250H-C18-Q datasheet, BZT5250H-C18-Q pinout, BZT5250H-C18-Q application, or BZT5250H-C18-Q equivalent, this page delivers verified electrical characteristics, thermal resistance values, cathode/anode terminal mapping, leakage behavior at low VR, and automotive-grade reliability context - all confirmed from Nexperia's Rev. 2 (18 July 2024) product data sheet.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified VZ = 17.1 V to 18.9 V at IZ = 50 µA, exhibiting a temperature coefficient of +0.05 mV/K and differential resistance ≤225 Ω at IZ = 5 mA. Its low test current enables stable regulation in ultra-low-power systems where quiescent current must remain below 100 µA.
The device features intentional minor leakage optimization per AN90031 for reduced noise and faster switching transients, and achieves Rth(j-a) = 330 K/W on FR4 PCB - confirming suitability for thermally constrained automotive cabin modules and portable instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.1 V to 18.9 V at IZ = 50 µA - defines precise regulation point under minimal bias current |
| Tolerance | ±5 % - supports cost-sensitive automotive subsystems where tight voltage margins are not required |
| Total Power Dissipation (Ptot) | 830 mW at Tamb ≤ 25 °C - enables operation up to 150 °C junction temperature in compact layouts |
| Forward Voltage (VF) | ≤ 0.9 V at IF = 10 mA - ensures low conduction loss when used bidirectionally or as clamp |
| Differential Resistance (rdiff) | ≤ 225 Ω at IZ = 5 mA - determines output impedance and load regulation sensitivity |
| Junction-to-Ambient Thermal Resistance | 330 K/W - sets maximum allowable power in free-air SMD placement without heatsinking |
| AEC-Q101 Qualified | Yes - validated for automotive electronics including infotainment power rails and body control modules |
Pinout & Package
SOD123F surface-mount plastic package: 2.6 mm × 1.6 mm × 1.1 mm body, single-sided copper FR4 mounting, cathode marked by bar.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal - reverse-biased during Zener operation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes bias path for controlled breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current Zener operation | Specified at IZ = 50 µA - enables direct battery monitoring without loading primary supply |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - improves transient response and reduces broadband noise in signal-chain references |
| AEC-Q101 qualification | Qualified for automotive Grade 2 (−40 °C to +105 °C ambient) - supports under-hood and dashboard applications |
| Small-form-factor SMD | SOD123F footprint - fits high-density PCBs with 1 cm² cathode pad for thermal management |
| Stable temperature coefficient | +0.05 mV/K near 18 V - minimizes drift across automotive temperature range without external compensation |
Applications
| Automotive Cabin Sensor Biasing | Portable Gas Detector Reference |
|---|---|
|
Use Scenario: Providing stable 18 V reference for MEMS pressure sensor amplifier in HVAC control module. IC Role / Device Role / Timing Role: Zener voltage reference supplying bias to op-amp input stage and ADC reference divider. Use Value: ±5 % tolerance and low 50 µA test current ensure accurate sensor scaling without draining 12 V battery during sleep mode. |
Use Scenario: Generating fixed reference for electrochemical gas sensor front-end in handheld detector. IC Role / Device Role / Timing Role: Low-power Zener shunt regulator establishing precision bias for analog front-end transimpedance stage. Use Value: 830 mW Ptot and 330 K/W Rth(j-a) allow continuous operation inside sealed plastic housing with no forced airflow. |
| Industrial PLC Input Protection | Medical Wearable Power Monitoring |
|
Use Scenario: Clamping and regulating 18 V auxiliary rail feeding isolated digital I/O drivers in DIN-rail controller. IC Role / Device Role / Timing Role: Overvoltage protection and voltage stabilization element in 24 V DC input conditioning circuit. Use Value: AEC-Q101 qualification and 150 °C Tj rating ensure long-term reliability in unventilated industrial enclosures. |
Use Scenario: Monitoring lithium coin-cell voltage via resistive divider anchored to 18 V Zener reference in ECG patch. IC Role / Device Role / Timing Role: Low-current voltage reference enabling accurate battery state-of-charge estimation over 5-year shelf life. Use Value: 50 µA test current and <1 µA leakage below 15 V minimize self-discharge - extending usable battery life by >12 months. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT5250H-B18-Q | ±2 % tolerance (vs. ±5 %), same VZ range and SOD123F package | Used where tighter regulation stability is required in feedback loops or precision ADC references | Select for closed-loop systems needing <±0.36 V variation; higher cost and lower availability than C-series |
| MMSZ5245B-TP | 18 V nominal, ±5 %, but rated at 20 mA test current and 500 mW Ptot | Common in consumer-grade power supplies; lacks AEC-Q101 qualification and low-IZ optimization | Acceptable only for non-automotive, non-battery-critical designs where thermal margin is ample and noise immunity is secondary |
Compared with BZT5250H-C18-Q, the BZT5250H-B18-Q offers tighter tolerance at higher test current, while MMSZ5245B-TP trades automotive reliability and low-bias performance for broader commercial availability - making the C18-Q optimal for cost-constrained, low-power automotive sensing.
Availability
BZT5250H-C18-Q is available at Aetrix Electronics and suitable for automotive cabin sensors, portable gas detectors, industrial PLC input stages, and medical wearable power monitors requiring stable component supply with AEC-Q101 assurance and low-quiescent-current regulation.
Supply support for BZT5250H-C18-Q 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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and mobile markets.
BZT5250H-Q series belongs to Nexperia's AEC-Q101-qualified Zener portfolio, engineered specifically for low-current voltage regulation in battery-constrained and thermally demanding automotive subsystems.
FAQ
What is the exact Zener voltage range for BZT5250H-C18-Q at 50 µA test current?
The BZT5250H-C18-Q has a guaranteed Zener voltage range of 17.1 V to 18.9 V when measured at IZ = 50 µA and Tj = 25 °C, per Table 8 of Nexperia's Rev. 2 (18 July 2024) datasheet. This ±5 % tolerance reflects the "C" series designation and is validated across the full operating temperature range.
Does BZT5250H-C18-Q support reflow soldering only, or can it be hand-soldered?
Reflow soldering is the only recommended method per Nexperia's documentation (Section 13). Hand-soldering is not advised due to thermal stress risks: peak reflow temperature is 260 °C for ≤30 seconds, and localized iron contact exceeds safe junction limits. The SOD123F package's small thermal mass makes manual soldering prone to delamination or parametric shift.
How does the "intentional minor rise of leakage current" affect circuit design?
Per AN90031, the controlled IR increase improves transient response and suppresses high-frequency noise in reference paths. In practice, this means faster settling after load steps and lower RMS noise in sensor bias networks - but requires verifying that leakage remains <1 µA below 15 V to avoid unintended discharge in always-on battery circuits.
Is thermal resistance affected by PCB copper area beyond the 1 cm² cathode pad specified?
Yes - Rth(j-sp) drops to 70 K/W only with a dedicated 1 cm² cathode pad (Table 6). Reducing pad area increases thermal resistance nonlinearly: halving the pad to 0.5 cm² raises Rth(j-a) by ~25 %, directly limiting usable power. Layout must follow Figure 10's reflow footprint to achieve datasheet-rated 830 mW dissipation.
BZT5250H-C18-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZT5250H-Q
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
BZT5250H-C18-QX FAQ
1.How can I place an order for BZT5250H-C18-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT5250H-C18-QX 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-C18-QX reliable?
The price and inventory of BZT5250H-C18-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT5250H-C18-QX is usually 5 days.
3.What payment methods are accepted for BZT5250H-C18-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT5250H-C18-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT5250H-C18-QX?
BZT5250H-C18-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT5250H-C18-QX 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-C18-QX?
For technical support, including BZT5250H-C18-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT5250H-C18-QX requirements.
6.How does Aetrix verify that BZT5250H-C18-QX is sourced from the original manufacturer or authorized distributors?
All BZT5250H-C18-QX 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-C18-QX meets industry standards.
7.What is the process for return or replacement of BZT5250H-C18-QX?
All BZT5250H-C18-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT5250H-C18-QX, 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-C18-QX part is unused and in its original packaging.
Return procedure for BZT5250H-C18-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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