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Nexperia USA Inc. BZT5250H-B51-QX
- Part No.:
- BZT5250H-B51-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT5250H-B51-QX.pdf
- Description:
- DIODE ZENER 51V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:5,150
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Product details
Overview
BZT5250H-B51-QX from Nexperia is a low-current Zener diode in SOD123F package, rated for 51 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 networks.
For engineers reviewing the BZT5250H-B51-QX datasheet, BZT5250H-B51-QX pinout, BZT5250H-B51-QX application, or BZT5250H-B51-QX equivalent, this page delivers verified Zener voltage accuracy, thermal resistance (Rth(j-a) = 330 K/W), leakage behavior at VR = 45.9 V, differential resistance (400 Ω @ IZ = 2 mA), and cathode/anode terminal mapping per JEDEC-standard SOD123F layout.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified VZ of 50.0–52.0 V at IZ = 2 mA, exhibiting a positive temperature coefficient of +0.05 mV/K and low capacitance (40 pF @ f = 1 MHz, VR = 0 V). Its design targets stable reference generation under microampere-level bias conditions.
The device features intentional leakage optimization per AN90031 for fast transient response and reduced noise in low-power analog monitoring circuits. It is qualified to AEC-Q101 with Tj up to 150 °C and supports reflow-only soldering on FR4 PCBs with 1 cm² cathode pad for thermal management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 50.0 V to 52.0 V at IZ = 2 mA - defines precise clamping level for overvoltage protection in 48 V automotive subsystems |
| Tolerance | ±2 % - ensures tight voltage regulation without post-production trimming in safety-critical bias rails |
| Differential Resistance rdiff | 400 Ω max @ IZ = 2 mA - limits output impedance drift under varying load, critical for stable reference stability |
| Reverse Current IR | 0.05 µA max @ VR = 45.9 V - enables ultra-low quiescent current operation in always-on vehicle modules |
| Total Power Dissipation Ptot | 830 mW @ Tamb ≤ 25 °C - supports continuous operation in compact SOD123F footprint without forced cooling |
| Thermal Resistance Rth(j-a) | 330 K/W - determines junction-to-ambient temperature rise under steady-state bias, guiding PCB copper area design |
| Forward Voltage VF | 0.9 V max @ IF = 10 mA - defines conduction loss during forward-biased fault conditions or polarity protection use |
Pinout & Package
SOD123F surface-mount plastic package: 2.6 mm × 1.6 mm × 1.1 mm body, flat lead configuration, 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 ≥1 cm² copper pad for thermal performance |
| 2 | Anode (A) | Connected to ground or lower-potential rail; forms reverse-biased junction with cathode for Zener action |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current specification | VZ defined at IZ = 50 µA - enables accurate regulation in energy-constrained IoT sensors and wake-up circuits |
| AEC-Q101 qualification | Qualified for automotive applications - guarantees reliability across -55 °C to +150 °C ambient and vibration profiles per ISO 16750 |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - improves switching speed and reduces broadband noise in feedback paths |
| Small-form-factor SMD | SOD123F package - allows high-density placement in ADAS camera modules and body control units with space constraints |
Applications
| Automotive ECU Bias Rail | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Providing stable 51 V reference for ADC input scaling in engine control unit power management ICs. IC Role / Device Role / Timing Role: Zener voltage regulator establishing precision reference point for analog front-end circuitry. Use Value: ±2 % VZ tolerance and 400 Ω rdiff ensure <±0.5 % full-scale error in 12-bit ADC measurements under thermal cycling. |
Use Scenario: Clamping transient spikes on 4–20 mA loop transmitters in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Overvoltage protection element absorbing ESD and inductive kickback energy. Use Value: 830 mW Ptot and 40 pF capacitance prevent signal distortion while maintaining loop integrity up to 100 kHz. |
| Portable Medical Device Power Monitoring | EV Battery Management System Reference |
Use Scenario: Generating low-power reference for lithium-ion cell voltage monitoring in wearable diagnostic equipment. IC Role / Device Role / Timing Role: Low-quiescent-current Zener providing stable threshold for comparator-based undervoltage lockout. Use Value: 0.05 µA IR at 45.9 V extends battery life beyond 12 months in always-on monitoring mode. |
Use Scenario: Supplying calibrated reference to isolated voltage sense amplifiers in 400 V EV battery pack monitoring units. IC Role / Device Role / Timing Role: Precision shunt regulator stabilizing auxiliary supply for isolated gate drivers and communication ICs. Use Value: AEC-Q101 qualification and 150 °C Tj rating ensure functional safety compliance in ASIL-B subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT5250H-C51-Q | ±5 % tolerance vs. ±2 %; identical VZ range (50–52 V) and SOD123F package | Acceptable where reference accuracy <±1 % is not required, e.g., non-critical power sequencing | Select when cost sensitivity outweighs voltage precision needs in high-volume consumer modules |
| MMSZ5257B-TP | 51 V nominal, ±5 %, 500 mW Ptot, SOD-123 package, no AEC-Q101 qualification | Limited to industrial/commercial use; lacks automotive reliability validation and thermal derating data | Use only in non-automotive designs where 330 mW lower power margin is acceptable and qualification is not mandated |
Compared with BZT5250H-B51-QX, the C51-Q variant trades precision for cost in non-safety-critical roles, while MMSZ5257B-TP lacks automotive qualification and thermal headroom-making the BZT5250H-B51-QX the sole choice for ASIL-compliant 51 V reference generation.
Availability
BZT5250H-B51-QX is available at Aetrix Electronics and suitable for automotive ECU bias rails, industrial 4–20 mA loop protection, and portable medical voltage monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZT5250H-B51-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 advanced packaging technologies.
The BZT5250H-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current, high-stability voltage regulation in automotive and industrial systems where precision, thermal robustness, and long-term reliability are mandatory.
FAQ
What is the maximum reverse voltage before breakdown for BZT5250H-B51-QX?
The guaranteed Zener breakdown occurs between 50.0 V and 52.0 V at IZ = 2 mA. Below 45.9 V, reverse current remains ≤0.05 µA - confirming stable non-conducting behavior in pre-breakdown region. This 4.1 V guard band ensures immunity to ripple and transients in 48 V system rails.
Can BZT5250H-B51-QX be used in place of a 5.1 V Zener diode?
No - BZT5250H-B51-QX is a 51 V device, not 5.1 V. The "51" in the part number denotes nominal Zener voltage, not a decimal value. Substituting it for a 5.1 V Zener would result in catastrophic overvoltage failure of downstream circuitry due to mismatched clamping level.
Is reflow soldering mandatory for BZT5250H-B51-QX?
Yes - the datasheet explicitly states "reflow soldering is the only recommended soldering method" for SOD123F packages. Wave or hand soldering risks thermal damage to the die and compromises AEC-Q101 reliability. Reflow profile must follow JEDEC J-STD-020, peak temperature ≤260 °C.
Does BZT5250H-B51-QX support bidirectional ESD protection?
No - it is a unidirectional Zener diode optimized for reverse-bias regulation. Its forward voltage is 0.9 V, but it lacks symmetric clamping characteristics or specified IPP ratings for IEC 61000-4-2 ESD events. For bidirectional protection, dedicated TVS diodes like PESD5V0S1BA should be used instead.
BZT5250H-B51-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):
- 51 V
- Tolerance:
- ±2%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 180 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.7 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-B51-QX FAQ
1.How can I place an order for BZT5250H-B51-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT5250H-B51-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-B51-QX reliable?
The price and inventory of BZT5250H-B51-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-B51-QX is usually 5 days.
3.What payment methods are accepted for BZT5250H-B51-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT5250H-B51-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT5250H-B51-QX?
BZT5250H-B51-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT5250H-B51-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-B51-QX?
For technical support, including BZT5250H-B51-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT5250H-B51-QX requirements.
6.How does Aetrix verify that BZT5250H-B51-QX is sourced from the original manufacturer or authorized distributors?
All BZT5250H-B51-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-B51-QX meets industry standards.
7.What is the process for return or replacement of BZT5250H-B51-QX?
All BZT5250H-B51-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT5250H-B51-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-B51-QX part is unused and in its original packaging.
Return procedure for BZT5250H-B51-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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