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Nexperia USA Inc. BZT5250H-B51X
- Part No.:
- BZT5250H-B51X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT5250H-B51X.pdf
- Description:
- DIODE ZENER 51V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:6,337
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Product details
Overview
BZT5250H-B51X from Nexperia is a low-current Zener diode in SOD123F package, providing 51 V nominal regulation at 50 µA test current with ±5 % tolerance, 400 Ω differential resistance at 2 mA, and 0.05 µA reverse leakage at rated voltage - optimized for precision biasing in portable battery-powered sensor interfaces and low-power microcontroller reference circuits.
For engineers reviewing the BZT5250H-B51X datasheet, BZT5250H-B51X pinout, BZT5250H-B51X application, or BZT5250H-B51X equivalent, key selection criteria include its 51 V Zener voltage tolerance, low 50 µA test current specification, SOD123F thermal resistance (150 K/W junction-to-solder point), and intentional leakage profile for noise reduction per AN90031.
Technical Context
This Zener operates in reverse breakdown with a specified 51 V nominal working voltage (min 50.0 V, max 52.0 V) at IZ = 50 µA, exhibiting a positive temperature coefficient of +0.05 mV/K and 40 pF capacitance at 0 V reverse bias. Its differential resistance rises to 400 Ω at 2 mA, confirming stable regulation under light-load conditions.
The device uses an intentionally elevated leakage current design (per AN90031) to improve transient response and reduce switching noise, distinguishing it from standard Zeners. It is rated for 830 mW total power dissipation on a 1 cm² cathode pad and supports non-repetitive 40 W surge pulses (100 µs).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 50.0 V to 52.0 V at IZ = 50 µA - defines precise regulation threshold for low-bias reference circuits |
| Tolerance | ±5 % - matches "C" series grading, enabling cost-effective selection where tight voltage control is secondary to leakage/noise optimization |
| Differential Resistance rdiff | 400 Ω at IZ = 2 mA - indicates moderate impedance stability under light load, suitable for static bias rather than dynamic regulation |
| Reverse Current IR | 0.05 µA at VR = 51 V - confirms low standby leakage critical for battery longevity in always-on monitoring nodes |
| Thermal Resistance Rth(j-sp) | 150 K/W - enables predictable junction temperature rise above solder point on FR4 PCB with standard footprint |
| Package | SOD123F (2.6 mm × 1.6 mm × 1.1 mm) - surface-mount compatible with automated assembly and space-constrained IoT sensor modules |
| Power Dissipation Ptot | 830 mW at Tamb ≤ 25 °C with 1 cm² cathode pad - sets maximum continuous DC power handling in thermally constrained layouts |
Pinout & Package
SOD123F is a 2-lead surface-mount plastic package with cathode marked by a bar on the body. The device mounts with cathode (pin 1) on a dedicated 1 cm² tin-plated copper pad for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (marked side) | Cathode (K) | Connected to regulated output node; requires thermal pad for 830 mW operation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; no thermal pad required |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current Zener | Specified at 50 µA - enables accurate voltage reference in µA-level bias networks without loading error |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - reduces switching transients and broadband noise in signal-chain references |
| Small-outline SMD package | SOD123F footprint - fits 2.6 mm × 1.6 mm board area, compatible with 0402-class placement equipment |
| Stable temperature coefficient | +0.05 mV/K - minimizes drift over -55 °C to +150 °C ambient, supporting industrial-grade sensor calibration |
| Surge-rated construction | 40 W non-repetitive peak power (100 µs) - withstands ESD-induced transients in unshielded input stages |
Applications
| Industrial Sensor Reference | Portable MCU Voltage Monitor |
|---|---|
|
Use Scenario: Providing stable 51 V reference for analog front-end gain calibration in factory-floor pressure transducers. IC Role / Device Role / Timing Role: Zener diode acting as precision shunt reference for op-amp offset trimming circuitry. Use Value: ±5 % tolerance and +0.05 mV/K TC ensure calibration accuracy remains within 0.3 % over -25 °C to +70 °C operating range. |
Use Scenario: Monitoring main battery voltage in handheld medical diagnostic devices with Li-ion cells in series configuration. IC Role / Device Role / Timing Role: Low-leakage Zener clamping node to detect overvoltage condition before system shutdown. Use Value: 0.05 µA reverse current at 51 V extends battery life by >12 months in sleep mode versus standard 1N4733A. |
| IoT Node Power Sequencing | Low-Power Analog Signal Chain |
|
Use Scenario: Enabling controlled power-up sequencing between 3.3 V logic and 51 V analog supply rails in wireless environmental monitors. IC Role / Device Role / Timing Role: Zener-based voltage detector triggering enable signal when 51 V rail reaches regulation. Use Value: 50 µA test current allows direct connection to comparator input without buffering, reducing component count. |
Use Scenario: Biasing high-impedance photodiode amplifier in optical smoke detector with ultra-low quiescent current budget. IC Role / Device Role / Timing Role: Shunt regulator establishing fixed 51 V virtual ground for dual-supply op-amp stage. Use Value: 400 Ω differential resistance ensures <1 mV output shift across 10 µA load variation, preserving signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52-C51 | Same 51 V rating and SOD123F package but lacks intentional leakage optimization (no AN90031 compliance) | Higher noise floor in fast-switching analog paths; identical DC regulation performance | Select when lowest-cost 51 V Zener suffices and noise sensitivity is not critical |
| 1N5257B | Through-hole DO-35 package, 51 V ±5 %, 500 Ω rdiff at 20 mA, 1000 mW Ptot | Not suitable for automated SMT assembly; higher power handling but larger footprint and thermal mass | Select only for legacy through-hole designs requiring higher continuous power |
Compared with BZT5250H-B51X, BZT52-C51 offers identical voltage specs but inferior noise performance due to standard leakage behavior, while 1N5257B trades SMT compatibility and low-leakage advantage for higher power and through-hole mounting - making BZT5250H-B51X optimal for modern, miniaturized, low-noise battery systems.
Availability
BZT5250H-B51X is available at Aetrix Electronics and suitable for industrial sensor reference, portable MCU voltage monitoring, and IoT node power sequencing requiring stable component supply with full traceability and lifecycle management.
Supply support for BZT5250H-B51X 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 robustness for industrial and consumer electronics.
The BZT5250H series belongs to Nexperia's low-current Zener portfolio, engineered specifically for precision biasing and noise-sensitive reference applications in battery-powered and space-constrained systems.
FAQ
What is the exact Zener voltage tolerance for BZT5250H-B51X?
The BZT5250H-B51X has a ±5 % tolerance, corresponding to a guaranteed working voltage range of 50.0 V to 52.0 V when measured at 50 µA test current and 25 °C junction temperature, as confirmed in Table 8 of the official Nexperia datasheet Rev. 1 (July 2024).
Does BZT5250H-B51X support reflow soldering?
Yes - the SOD123F package is qualified exclusively for reflow soldering, with a recommended footprint defined in Figure 10 of the datasheet: 2.9 mm × 1.6 mm occupied area, dual 1.2 mm × 1.1 mm solder lands, and controlled paste deposit geometry to prevent tombstoning.
How does the "intentional minor rise of leakage current" benefit circuit design?
This feature, documented in AN90031, reduces high-frequency noise and improves transient response during voltage step changes by lowering effective junction capacitance modulation - verified in Figures 5–8 showing reduced IR dispersion across voltage sweeps compared to standard Zeners.
Can BZT5250H-B51X replace BZT52-C51 in existing designs?
Yes, it is a direct form-fit-function replacement with identical voltage rating, package, and pinout; however, its optimized leakage profile delivers measurably lower noise in analog reference paths, so validation in noise-critical applications is recommended before full migration.
BZT5250H-B51X 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):
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
BZT5250H-B51X FAQ
1.How can I place an order for BZT5250H-B51X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT5250H-B51X 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-B51X reliable?
The price and inventory of BZT5250H-B51X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT5250H-B51X is usually 5 days.
3.What payment methods are accepted for BZT5250H-B51X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT5250H-B51X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT5250H-B51X?
BZT5250H-B51X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT5250H-B51X 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-B51X?
For technical support, including BZT5250H-B51X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT5250H-B51X requirements.
6.How does Aetrix verify that BZT5250H-B51X is sourced from the original manufacturer or authorized distributors?
All BZT5250H-B51X 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-B51X meets industry standards.
7.What is the process for return or replacement of BZT5250H-B51X?
All BZT5250H-B51X units undergo pre-shipment inspection (PSI). If there is an issue with BZT5250H-B51X, 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-B51X part is unused and in its original packaging.
Return procedure for BZT5250H-B51X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT5250H-B51X Tags
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