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Nexperia USA Inc. BZT5250H-B18-QX
- Part No.:
- BZT5250H-B18-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT5250H-B18-QX.pdf
- Description:
- DIODE ZENER 18V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:5,770
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Product details
Overview
BZT5250H-B18-QX 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 AEC-Q101 qualification for automotive voltage regulation in battery-powered sensor nodes and ECU bias circuits.
For engineers reviewing the BZT5250H-B18-QX datasheet, BZT5250H-B18-QX pinout, BZT5250H-B18-QX application, or BZT5250H-B18-QX equivalent, this page provides verified Zener voltage, differential resistance, thermal resistance, leakage behavior, and automotive-grade reliability data - critical for low-power rail stabilization and precision reference design.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified 18 V nominal working voltage (17.6–18.4 V min/max) at IZ = 50 µA, exhibiting 225 Ω typical differential resistance at IZ = 5 mA and a temperature coefficient of +0.05 mV/K. Its low 50 µA test current enables stable regulation in microamp-level bias networks.
Designed for surface-mount use on FR4 PCBs, it delivers 830 mW total power dissipation at Tamb ≤ 25 °C with cathode-side thermal pad, and features intentional minor leakage rise to reduce switching noise per AN90031 - making it suitable for low-noise analog sensing front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 17.6 V to 18.4 V at IZ = 50 µA - tight ±2 % tolerance ensures predictable clamping in low-current reference paths |
| Differential Resistance rdiff | 225 Ω max at IZ = 5 mA - defines output impedance under regulation, critical for load transient response |
| Forward Voltage VF | 0.9 V max at IF = 10 mA - enables predictable forward conduction during polarity-reversal protection |
| Total Power Dissipation Ptot | 830 mW at Tamb ≤ 25 °C - sets maximum continuous power handling on standard FR4 with 1 cm² cathode pad |
| Junction-to-Ambient Rth(j-a) | 330 K/W - determines steady-state temperature rise in free-air mounting, essential for thermal margining |
| Reverse Current IR | 0.05 µA max at VR = 14.4 V - ultra-low leakage preserves battery life in always-on monitoring circuits |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per AEC stress test standards |
Pinout & Package
SOD123F plastic surface-mount package: 2.6 mm × 1.6 mm × 1.1 mm body, flat lead, 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 power dissipation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased operation places voltage drop across K–A terminals |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current Zener operation | Specified at 50 µA - enables stable voltage reference in µA-level bias networks without loading sensitive sources |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - reduces high-frequency noise and improves transient stability in analog signal chains |
| AEC-Q101 qualification | Qualified for automotive applications - supports deployment in engine control modules, ADAS sensors, and infotainment power rails |
| Tight ±2 % voltage tolerance | 17.6–18.4 V range at 50 µA - eliminates need for post-production trimming in precision 18 V reference designs |
| Small SOD123F footprint | 2.6 mm × 1.6 mm - saves board space in compact modules like OBD-II dongles and battery management IC support circuitry |
Applications
| Automotive Sensor Biasing | Portable Medical Device Reference |
|---|---|
|
Use Scenario: Providing stable 18 V bias to MEMS pressure sensor amplifiers in engine manifold modules. IC Role / Device Role / Timing Role: Zener voltage regulator establishing fixed reference potential for op-amp input stages. Use Value: ±2 % VZ tolerance and low 50 µA test current ensure minimal current draw while maintaining ADC accuracy over -40 °C to +125 °C. |
Use Scenario: Generating precise 18 V reference for analog front-end of handheld ECG monitor powered by coin cell. IC Role / Device Role / Timing Role: Low-leakage Zener shunt regulator supplying clean reference to instrumentation amplifier. Use Value: 0.05 µA max reverse current at 14.4 V preserves battery runtime; AEC-Q101 qualification validates long-term reliability in field-deployed units. |
| Industrial IoT Node Power Rail Clamp | Automotive Infotainment USB Port Protection |
|
Use Scenario: Clamping 18 V auxiliary rail in LoRaWAN gateway node exposed to variable solar-charged battery input. IC Role / Device Role / Timing Role: Overvoltage protection element limiting rail excursion during surge events. Use Value: 830 mW Ptot and 40 W non-repetitive peak power rating enable robust transient suppression without external TVS stacking. |
Use Scenario: Stabilizing 18 V supply to USB-C PD controller IC in automotive head unit during cold-crank transients. IC Role / Device Role / Timing Role: Precision Zener regulator maintaining controller VCC within spec during 6–16 V battery dips. Use Value: 225 Ω rdiff ensures <100 mV droop under 10 mA load steps; SOD123F package allows placement near PD IC for minimal loop inductance. |
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 | ±5 % tolerance, 300 mW Ptot, SOT23 package | Higher voltage drift and lower power handling limit use in high-accuracy or higher-current roles | Select when cost sensitivity outweighs precision and thermal performance requirements |
| MMSZ5245B | ±5 % tolerance, 500 mW Ptot, SOD123 package (no thermal pad) | Lacks AEC-Q101 qualification and has higher Rth(j-a) (400 K/W), reducing automotive suitability | Prefer for commercial-grade consumer electronics where automotive qualification is not required |
Compared with BZT5250H-B18-QX, BZX84-C18 offers lower cost but sacrifices voltage accuracy and thermal capability, while MMSZ5245B trades automotive qualification and thermal performance for broader distributor availability in non-automotive designs.
Availability
BZT5250H-B18-QX is available at Aetrix Electronics and suitable for automotive sensor biasing, portable medical device references, and industrial IoT node power rail clamping requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZT5250H-B18-QX 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 components and energy-efficient solutions.
The BZT5250H-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current, low-noise voltage regulation in automotive and portable electronics where precision, reliability, and space constraints are critical.
FAQ
What is the exact Zener voltage tolerance for BZT5250H-B18-QX?
The BZT5250H-B18-QX has a guaranteed Zener voltage range of 17.6 V to 18.4 V at IZ = 50 µA, corresponding to ±2 % tolerance per the B-series designation in the datasheet. This is tighter than the ±5 % C-series variants and confirmed in Table 8 of the July 2024 revision.
Does BZT5250H-B18-QX require a thermal pad on the PCB?
Yes - the SOD123F package specifies a 1 cm² cathode-side copper pad to achieve the rated 830 mW total power dissipation at Tamb ≤ 25 °C. Without this pad, Ptot drops to 375 mW, as defined in Table 1 footnote [3] and Table 5 limiting values.
Is BZT5250H-B18-QX suitable for reverse-polarity protection?
No - it is a Zener diode optimized for reverse-bias voltage regulation, not forward-bias blocking. Its 0.9 V forward voltage at 10 mA is not rated for sustained forward conduction; use a dedicated Schottky or MOSFET-based protection circuit instead.
How does the "intentional minor rise of leakage current" benefit circuit performance?
Per AN90031, this controlled leakage profile reduces high-frequency noise and improves transient response during fast voltage changes - particularly valuable in analog sensor interfaces and low-noise LDO feedback networks where conventional Zeners exhibit ringing or overshoot.
BZT5250H-B18-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:
- ±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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
BZT5250H-B18-QX FAQ
1.How can I place an order for BZT5250H-B18-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT5250H-B18-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-B18-QX reliable?
The price and inventory of BZT5250H-B18-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-B18-QX is usually 5 days.
3.What payment methods are accepted for BZT5250H-B18-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT5250H-B18-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT5250H-B18-QX?
BZT5250H-B18-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT5250H-B18-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-B18-QX?
For technical support, including BZT5250H-B18-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT5250H-B18-QX requirements.
6.How does Aetrix verify that BZT5250H-B18-QX is sourced from the original manufacturer or authorized distributors?
All BZT5250H-B18-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-B18-QX meets industry standards.
7.What is the process for return or replacement of BZT5250H-B18-QX?
All BZT5250H-B18-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT5250H-B18-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-B18-QX part is unused and in its original packaging.
Return procedure for BZT5250H-B18-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT5250H-B18-QX Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAZ12-13-F
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