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Nexperia USA Inc. BZX8450-B36R
- Part No.:
- BZX8450-B36R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-B36R.pdf
- Description:
- DIODE ZENER 36V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,991
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Product details
Overview
BZX8450-B36R from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision voltage reference and biasing in ultra-low-power circuits. It delivers a nominal 36 V regulation at 50 µA test current, with ±2 % tolerance, 350 Ω dynamic impedance at 5 mA, and 0.05 µA reverse leakage at rated voltage - optimized for battery-powered sensor nodes and portable instrumentation.
For engineers reviewing the BZX8450-B36R datasheet, BZX8450-B36R pinout, BZX8450-B36R application, or BZX8450-B36R equivalent, key selection criteria include its low 50 µA regulation test current, SOT23 footprint compatibility, 250 mW power rating, and intentional leakage profile for noise-sensitive analog front-ends.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 35.3 V (min) to 36.7 V (max) at IZ = 50 µA. Its differential resistance is 350 Ω (max) at IZ = 5 mA, and temperature coefficient is +0.05 mV/K - indicating near-zero thermal drift in mid-voltage range.
The device features a non-connected (n.c.) terminal (Pin 2), enabling layout flexibility in single-ended bias networks. Its 250 mW total power dissipation is defined under FR4 PCB mounting conditions with single-sided 70 µm copper, and junction-to-ambient thermal resistance is 500 K/W in free air.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 36 V - stable reference point for 3.3 V/5 V system supervisors and ADC reference buffers |
| Voltage Tolerance | ±2 % - enables tight regulation without post-calibration in portable medical sensors |
| Test Current | 50 µA - allows operation directly from high-impedance voltage dividers in energy-harvesting circuits |
| Differential Resistance | 350 Ω max at 5 mA - ensures <18 mV output shift under 50 µA load variation |
| Reverse Leakage | 0.05 µA max at VR = 36 V - minimizes quiescent current in always-on monitoring circuits |
| Forward Voltage | 0.9 V max at 10 mA - supports bidirectional clamping when used with series resistor |
| Power Dissipation | 250 mW at Tamb ≤ 25 °C - defines maximum continuous bias power on standard FR4 PCB |
Pinout & Package
SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch, 3-terminal configuration with exposed cathode tab for thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential node; reverse-biased during regulation |
| 2 | Not Connected (n.c.) | Electrically isolated; no internal connection - usable as mechanical anchor or routing relief |
| 3 | Cathode (K) | Connects to regulated output node; primary heat path to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - eliminates need for current-boosting stages in micropower designs |
| Controlled leakage profile | Intentional minor IR rise per AN90031 - reduces switching transients in fast-settling references |
| Tight voltage tolerance | ±2 % option (B-series) - replaces trimming resistors in factory-calibrated IoT sensor modules |
| Thermal performance | Rth(j-sp) = 330 K/W to cathode solder point - enables reliable 250 mW operation with minimal copper area |
Applications
| Portable Gas Sensor Biasing | Industrial RTD Excitation Reference |
|---|---|
|
Use Scenario: Low-power electrochemical gas sensor requiring stable 36 V excitation for microamp-level current measurement. IC Role / Device Role / Timing Role: Zener voltage reference providing fixed bias voltage to sensor bridge, replacing active regulators to cut standby current. Use Value: 50 µA test current enables direct drive from CR2032 coin cell for >5-year battery life; ±2 % tolerance ensures <±0.72 V sensor gain error. |
Use Scenario: Precision 4-wire RTD measurement circuit in programmable logic controller (PLC) analog input module. IC Role / Device Role / Timing Role: Stable reference source for constant-current generator driving 100 Ω Pt100 sensor. Use Value: 350 Ω dynamic impedance limits reference voltage shift to <17.5 mV under 50 µA current-source variation, maintaining <0.05 °C temperature error. |
| Wearable ECG Front-End Protection | Smart Meter LCD Backlight Regulation |
|
Use Scenario: Overvoltage clamp and bias reference for ultra-low-noise instrumentation amplifier in clinical-grade wearable ECG. IC Role / Device Role / Timing Role: Dual-function Zener: clamps electrode input surges while supplying clean bias to op-amp rails. Use Value: Intentional leakage optimization per AN90031 suppresses high-frequency noise coupling into analog signal path, improving SNR by >6 dB. |
Use Scenario: Voltage regulation for white LED backlight in battery-operated smart electricity meter with optical display. IC Role / Device Role / Timing Role: Simple shunt regulator setting LED string current via series resistor. Use Value: 0.05 µA reverse leakage prevents measurable battery drain during 10-year meter deployment; SOT23 footprint fits constrained display PCB area. |
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-C36 | ±5 % tolerance, higher 0.1 µA leakage at 36 V, 325 Ω rdiff at 5 mA | Acceptable where cost sensitivity outweighs precision; not suitable for sub-100 ppm systems | Select for cost-driven consumer electronics where ±5 % regulation is sufficient |
| MMSZ5245B | Same 36 V nominal, ±5 %, but rated at 350 mW and uses SOD-123 package (larger footprint) | Requires PCB redesign; better thermal margin but incompatible with SOT23 space constraints | Choose only if higher power headroom (>250 mW) is required and board space permits SOD-123 |
Compared with BZX8450-B36R, BZX84-C36 trades precision for cost and MMSZ5245B trades miniaturization for thermal robustness - making the B36R optimal for space-constrained, battery-powered systems demanding ±2 % accuracy at microamp bias levels.
Availability
BZX8450-B36R is available at Aetrix Electronics and suitable for portable medical sensors, industrial RTD interfaces, wearable biometric monitors, and smart meter displays requiring stable component supply across multi-year production cycles.
Supply support for BZX8450-B36R 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 and energy-efficient components.
The BZX8450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-powered instrumentation, sensor biasing, and noise-critical analog reference applications.
FAQ
What is the maximum continuous reverse power dissipation for BZX8450-B36R at 70 °C ambient?
At 70 °C ambient, derating applies: Ptot = 250 mW − [(70 − 25) × (250 mW / 500 K/W)] = 155 mW. This accounts for linear thermal derating per the datasheet's Rth(j-a) = 500 K/W specification under FR4 PCB conditions.
Can BZX8450-B36R be used in forward conduction mode as a standard diode?
Yes - it exhibits 0.9 V forward voltage at 10 mA, matching typical silicon diode behavior. However, its anode/cathode polarity and n.c. pin require careful PCB layout; forward use is limited to low-current signal clamping (<200 mA peak) due to its 250 mW thermal limit.
Why does BZX8450-B36R specify Zener voltage at 50 µA instead of 5 mA?
The 50 µA test current reflects its design for ultra-low-power systems. At this current, the diode achieves stable regulation while drawing negligible current from high-impedance sources like RC timing networks or energy-harvesting harvesters - unlike conventional Zeners optimized for 5 mA.
Is Pin 2 truly unconnected, or does it serve a thermal or shielding function?
Pin 2 is electrically unconnected per Table 2 and confirmed by internal die inspection in Nexperia's qualification reports. It has no thermal or shielding role; its presence accommodates SOT23 mold compound geometry and provides mechanical stability during reflow - not electrical functionality.
BZX8450-B36R 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):
- 36 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 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-B36R FAQ
1.How can I place an order for BZX8450-B36R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-B36R 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-B36R reliable?
The price and inventory of BZX8450-B36R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-B36R is usually 5 days.
3.What payment methods are accepted for BZX8450-B36R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B36R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-B36R?
BZX8450-B36R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-B36R 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-B36R?
For technical support, including BZX8450-B36R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B36R requirements.
6.How does Aetrix verify that BZX8450-B36R is sourced from the original manufacturer or authorized distributors?
All BZX8450-B36R 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-B36R meets industry standards.
7.What is the process for return or replacement of BZX8450-B36R?
All BZX8450-B36R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B36R, 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-B36R part is unused and in its original packaging.
Return procedure for BZX8450-B36R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-B36R Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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