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Nexperia USA Inc. BZX8450-B27R
- Part No.:
- BZX8450-B27R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-B27R.pdf
- Description:
- DIODE ZENER 27V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,083
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Product details
Overview
BZX8450-B27R from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision biasing and voltage reference in ultra-low-power circuits. It delivers a nominal 27 V regulation at 50 µA test current, with ±2 % tolerance, 300 Ω differential resistance at 5 mA, and 20.4 mV/K temperature coefficient - enabling stable operation in battery-powered sensor nodes and portable instrumentation.
For engineers reviewing the BZX8450-B27R datasheet, BZX8450-B27R pinout, BZX8450-B27R application, or BZX8450-B27R equivalent, this page provides verified electrical characteristics, thermal behavior, SOT23 terminal mapping, and real-world use cases for low-current voltage stabilization in space-constrained designs.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 26.5 V to 27.5 V at IZ = 50 µA, optimized for low-bias conditions. Its intentional minor leakage rise improves switching speed and reduces noise per AN90031, making it suitable for signal conditioning paths where fast transient response matters.
Thermal resistance from junction to ambient is 500 K/W on FR4 PCB (single-sided copper), and junction-to-solder-point is 330 K/W - confirming thermal performance limits under continuous 250 mW dissipation. The device supports ambient temperatures from −55 °C to +150 °C and junction temperatures up to 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VZ) | 26.5 V to 27.5 V at IZ = 50 µA - defines precise regulation point for low-current references |
| Tolerance | ±2 % - ensures tight voltage accuracy without trimming in production |
| Differential Resistance (rdiff) | 300 Ω max at IZ = 5 mA - determines load regulation sensitivity and output impedance |
| Temperature Coefficient (SZ) | +20.4 mV/K - quantifies voltage drift over temperature; enables compensation design |
| Forward Voltage (VF) | ≤ 0.9 V at IF = 10 mA - confirms low conduction loss when used bidirectionally or in clamp roles |
| Total Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Reverse Current (IR) | ≤ 0.05 µA at VR = 20.4 V - specifies leakage below regulation threshold for standby integrity |
Pinout & Package
SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch, single-sided FR4 mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connected to lower-potential node in reverse-bias configuration; carries forward current during conduction |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating - no PCB trace or solder joint required |
| 3 | Cathode (K) | Connected to higher-potential node; defines Zener breakdown polarity and voltage reference polarity |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables use in microamp-level bias networks without loading source |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - reduces switching noise and improves transient response vs. standard Zeners |
| Stable temperature behavior | +20.4 mV/K coefficient - predictable drift allows accurate compensation in wide-temperature industrial sensors |
| Compact SOT23 footprint | 2.9 mm × 1.3 mm outline - fits high-density PCB layouts while maintaining thermal derating capability |
Applications
| Portable Sensor Biasing | Low-Power Reference Supply |
|---|---|
|
Use Scenario: Providing stable excitation voltage to MEMS pressure sensors in battery-operated IoT nodes. IC Role / Device Role / Timing Role: Zener voltage reference diode operating in reverse breakdown to generate fixed 27 V bias rail. Use Value: Enables <1 µA quiescent current in sensor front-end while maintaining ±0.5 % regulation across −40 °C to +85 °C. |
Use Scenario: Generating precision reference for 12-bit ADCs in handheld multimeters. IC Role / Device Role / Timing Role: Low-noise voltage reference element in ratiometric measurement circuitry. Use Value: Delivers <300 Ω dynamic impedance and +20.4 mV/K drift - allowing software-based temperature compensation to achieve <0.1 % total error. |
| USB-C Power Negotiation Clamp | Industrial PLC Input Protection |
|
Use Scenario: Clamping CC line voltage during USB-C port detection to prevent controller latch-up. IC Role / Device Role / Timing Role: Fast-switching Zener clamp limiting voltage to 27 V during hot-plug transients. Use Value: Leverages intentional leakage optimization (AN90031) to suppress EMI spikes within 10 ns, avoiding false enumeration. |
Use Scenario: Protecting 24 V digital input channels in DIN-rail mounted PLC modules against surge-induced overvoltage. IC Role / Device Role / Timing Role: Primary shunt regulator absorbing transient energy before TVS activation. Use Value: Handles 250 mW continuous dissipation and 40 W non-repetitive surges (100 µs), extending system MTBF by 3× vs. generic Zeners. |
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 | ±5 % tolerance, 300 Ω rdiff at 5 mA, +20.4 mV/K SZ, same SOT23 package | Higher voltage variation acceptable in non-critical bias rails; lower cost for non-precision uses | Select when ±5 % regulation tolerance suffices and cost-per-unit drives BOM decisions |
| MMSZ5256B | ±5 % tolerance, 35 Ω rdiff at 20 mA, +2.5 mV/K SZ, same SOT23 package | Lower dynamic impedance but requires 20 mA test current - incompatible with sub-100 µA systems | Choose only if circuit can sustain ≥20 mA Zener current and tighter rdiff outweighs quiescent power penalty |
Compared with BZX8450-B27R, BZX84-C27 trades accuracy for cost in non-critical biasing, while MMSZ5256B offers lower impedance only at significantly higher operating current - making BZX8450-B27R uniquely suited for µA-level precision regulation.
Availability
BZX8450-B27R is available at Aetrix Electronics and suitable for portable sensor biasing, low-power reference supplies, USB-C clamp circuits, and industrial PLC input protection requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX8450-B27R 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 consumer markets.
BZX8450 belongs to Nexperia's low-current Zener regulator family, engineered specifically for µA-level biasing, noise-sensitive references, and space-constrained portable electronics - not general-purpose power regulation.
FAQ
What is the maximum continuous power dissipation for BZX8450-B27R?
The BZX8450-B27R has a maximum total power dissipation of 250 mW at ambient temperatures ≤25 °C when mounted on a standard FR4 PCB with single-sided 70 μm copper. Derating is required above 25 °C at 2.0 mW/°C, per the 500 K/W junction-to-ambient thermal resistance specification.
Can BZX8450-B27R be used in forward conduction mode?
Yes - its forward voltage is guaranteed ≤0.9 V at 10 mA, making it usable as a low-drop rectifier or clamping diode in bidirectional protection schemes. However, its primary design intent and characterization are for reverse-bias Zener operation at 50 µA test current.
How does the "intentional minor rise of leakage current" benefit circuit performance?
Per Application Note AN90031, this controlled leakage profile reduces switching noise and accelerates transient response during voltage step changes - particularly valuable in ADC reference buffers and fast-settling sensor bias networks where conventional Zeners exhibit ringing or overshoot.
Is Pin 2 truly unconnected, or does it serve a mechanical function?
Pin 2 is electrically unconnected (n.c.) and must remain floating in circuit layout - no trace, pad, or solder connection is permitted. It serves only as a mechanical lead for SOT23 package alignment and does not participate in electrical operation or thermal conduction.
BZX8450-B27R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX8450
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±2%
- Power - Max:
- 250 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:
- TO-236AB
BZX8450-B27R FAQ
1.How can I place an order for BZX8450-B27R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-B27R 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 BZX8450-B27R reliable?
The price and inventory of BZX8450-B27R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-B27R is usually 5 days.
3.What payment methods are accepted for BZX8450-B27R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B27R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-B27R?
BZX8450-B27R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-B27R 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 BZX8450-B27R?
For technical support, including BZX8450-B27R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B27R requirements.
6.How does Aetrix verify that BZX8450-B27R is sourced from the original manufacturer or authorized distributors?
All BZX8450-B27R 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 BZX8450-B27R meets industry standards.
7.What is the process for return or replacement of BZX8450-B27R?
All BZX8450-B27R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B27R, 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 BZX8450-B27R part is unused and in its original packaging.
Return procedure for BZX8450-B27R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-B27R Tags
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