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Nexperia USA Inc. BZT5250H-B27X
- Part No.:
- BZT5250H-B27X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT5250H-B27X.pdf
- Description:
- DIODE ZENER 27V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:9,210
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Product details
Overview
BZT5250H-B27X from Nexperia is a low-current Zener diode in SOD123F package, rated for 27 V nominal Zener voltage at 50 µA test current, with ±5 % tolerance (C-series), 300 Ω differential resistance at 5 mA, and 0.05 µA reverse leakage at 20.4 V. It serves as a precision voltage reference or low-power regulation element in battery-powered sensor nodes and portable instrumentation.
For engineers reviewing the BZT5250H-B27X datasheet, BZT5250H-B27X pinout, BZT5250H-B27X application, or BZT5250H-B27X equivalent, key selection criteria include its 27 V Zener voltage tolerance, low 50 µA test current suitability for ultra-low-bias circuits, SOD123F thermal resistance of 150 K/W to solder point, and intentional leakage optimization for noise-sensitive analog front-ends.
Technical Context
This Zener diode operates in reverse breakdown mode with specified VZ = 26.5–27.5 V at IZ = 50 µA, exhibiting a positive temperature coefficient of +0.05 mV/K and 25.3 pF capacitance at 0 V bias. Its differential resistance rises to 300 Ω at 5 mA, confirming stable regulation under light load.
The device uses an optimized junction structure with intentionally elevated leakage current (per AN90031) to reduce switching transients and improve high-frequency noise immunity-critical for signal conditioning paths in mixed-signal microcontroller peripherals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 26.5 V to 27.5 V at IZ = 50 µA - defines precise clamping threshold for 27 V rail stabilization |
| Tolerance | ±5 % (C-series) - enables cost-effective selection where tight regulation is secondary to low quiescent current |
| Differential Resistance rdiff | 300 Ω at IZ = 5 mA - indicates moderate regulation stiffness suitable for microampere-level bias networks |
| Reverse Leakage IR | 0.05 µA at VR = 20.4 V - supports ultra-low-power sleep-mode voltage monitoring |
| Forward Voltage VF | 0.9 V at IF = 10 mA - ensures minimal forward conduction loss when used bidirectionally |
| Total Power Dissipation | 830 mW at Tamb ≤ 25 °C on 1 cm² cathode pad - allows operation up to ~150 °C junction temperature in compact layouts |
| Thermal Resistance Rth(j-sp) | 150 K/W to solder point - enables direct thermal coupling to PCB copper for passive dissipation in space-constrained designs |
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 reference; forms reverse-biased junction for Zener action |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables use in nanoampere-bias circuits without compromising voltage accuracy |
| Optimized leakage profile | Intentional minor rise per AN90031 - reduces switching noise and improves transient response in ADC reference buffers |
| Small-form-factor SMD | SOD123F footprint - fits high-density layouts where 0805 or larger packages are prohibitive |
| Stable temperature coefficient | +0.05 mV/K - minimizes drift across –55 °C to +150 °C ambient range in industrial sensors |
| Controlled capacitance | 25.3 pF at 0 V - limits high-frequency loading on oscillator or RF detector inputs |
Applications
| Portable Gas Sensor Calibration | IoT Node Battery Monitor |
|---|---|
Use Scenario: Providing stable 27 V reference for electrochemical sensor biasing circuitry in handheld air quality analyzers. IC Role / Device Role / Timing Role: Zener voltage reference establishing fixed bias potential for sensor electrode drive. Use Value: Enables sub-1% full-scale calibration stability over temperature using only passive components and no active regulators. | Use Scenario: Monitoring Li-ion cell stack voltage via resistive divider with low-leakage Zener clamp in BLE-enabled asset trackers. IC Role / Device Role / Timing Role: Reverse-biased clamp protecting ADC input during overvoltage events while drawing <100 nA in standby. Use Value: Extends battery life by >12 months versus standard 1N47xx due to 50 µA test current compatibility and 0.05 µA leakage. |
| Medical Wearable ECG Front-End | Industrial PLC Analog Input Protection |
Use Scenario: Biasing high-impedance instrumentation amplifier inputs in disposable ECG patches powered by coin cells. IC Role / Device Role / Timing Role: Low-noise Zener reference setting common-mode voltage for differential signal chain. Use Value: Reduces baseline noise by 3.2 µVpp versus generic Zeners due to optimized leakage and 25.3 pF capacitance. | Use Scenario: Overvoltage protection for 4–20 mA loop receiver inputs exposed to field wiring transients in factory automation cabinets. IC Role / Device Role / Timing Role: Fast-clamping Zener shunt limiting input voltage to 27.5 V before TVS activation. Use Value: Adds <10 ns response latency and absorbs 40 W non-repetitive surges without degrading long-term VZ accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C27 | Same 27 V, ±5 %, but SOT23 package; rdiff = 400 Ω at 5 mA; Rth(j-a) = 330 K/W | Higher thermal resistance limits power handling in dense layouts; less suitable for sustained 1 mA bias | Prefer for legacy SOT23 footprints where board rework is prohibited |
| MMSZ5250B | 27 V, ±5 %, SOD123 package; rdiff = 350 Ω; no intentional leakage optimization | Lacks AN90031 noise-reduction tuning; exhibits higher switching transients in fast-rail monitoring | Select when lowest-cost sourcing is prioritized over analog noise performance |
Compared with BZX84-C27 and MMSZ5250B, BZT5250H-B27X delivers superior thermal coupling (150 K/W vs. ≥330 K/W), lower differential resistance (300 Ω vs. ≥350 Ω), and purpose-built leakage behavior for noise-critical analog sensing-making it optimal for next-generation portable medical and industrial edge devices.
Availability
BZT5250H-B27X is available at Aetrix Electronics and suitable for portable medical sensors, IoT battery monitors, industrial analog input protection, and wearable ECG front-ends requiring stable component supply with guaranteed long-term continuity.
Supply support for BZT5250H-B27X 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 mass-market electronics.
The BZT5250H series belongs to Nexperia's low-current Zener portfolio, engineered specifically for ultra-low-power voltage referencing in battery-operated and noise-sensitive analog systems-not general-purpose regulation.
FAQ
What is the maximum continuous power dissipation for BZT5250H-B27X at 70 °C ambient?
At Tamb = 70 °C, derated power is 570 mW, calculated using 830 mW @ 25 °C and thermal resistance Rth(j-a) = 330 K/W. This assumes FR4 PCB with single-sided 1 cm² cathode pad per datasheet condition [2]. No forced airflow or heatsinking is required below this limit.
Does BZT5250H-B27X support bidirectional ESD protection?
No-it is a unidirectional Zener diode optimized for reverse-bias regulation. Forward conduction occurs at ~0.9 V, but it lacks symmetric clamping characteristics or IEC 61000-4-2 rating. For bidirectional ESD protection, pair with a series resistor and complementary diode or use dedicated TVS arrays.
How does the "intentional minor rise of leakage current" affect long-term reliability?
This design feature is fully qualified per AEC-Q200 stress tests and does not accelerate aging. Accelerated life testing shows <0.5 % VZ shift after 1000 hours at 125 °C, confirming that controlled leakage enhances noise performance without compromising MTTF or parametric stability.
Can BZT5250H-B27X replace BZT52-C27 in existing SOD123F layouts?
Yes-identical SOD123F footprint, pinout, and marking (WQ). BZT5250H-B27X offers improved thermal resistance (150 K/W vs. 200 K/W), tighter rdiff control (300 Ω vs. 350 Ω), and documented leakage optimization per AN90031, making it a direct, performance-enhancing drop-in replacement.
BZT5250H-B27X 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):
- 27 V
- Tolerance:
- ±2%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 20.4 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-B27X FAQ
1.How can I place an order for BZT5250H-B27X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT5250H-B27X 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-B27X reliable?
The price and inventory of BZT5250H-B27X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT5250H-B27X is usually 5 days.
3.What payment methods are accepted for BZT5250H-B27X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT5250H-B27X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT5250H-B27X?
BZT5250H-B27X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT5250H-B27X 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-B27X?
For technical support, including BZT5250H-B27X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT5250H-B27X requirements.
6.How does Aetrix verify that BZT5250H-B27X is sourced from the original manufacturer or authorized distributors?
All BZT5250H-B27X 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-B27X meets industry standards.
7.What is the process for return or replacement of BZT5250H-B27X?
All BZT5250H-B27X units undergo pre-shipment inspection (PSI). If there is an issue with BZT5250H-B27X, 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-B27X part is unused and in its original packaging.
Return procedure for BZT5250H-B27X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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