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Nexperia USA Inc. BZX8450-B20R
- Part No.:
- BZX8450-B20R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-B20R.pdf
- Description:
- DIODE ZENER 20V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,738
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Product details
Overview
BZX8450-B20R 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 20 V regulation at 50 µA test current, with ±2 % tolerance, 250 mW total power dissipation, and 15.2 V minimum/16.7 V maximum reverse breakdown voltage (IZ = 5 mA). It is used in battery-powered sensor nodes requiring stable reference under microampere quiescent conditions.
For engineers reviewing the BZX8450-B20R datasheet, BZX8450-B20R pinout, BZX8450-B20R application, or BZX8450-B20R equivalent, this page provides verified electrical characteristics, thermal resistance data (Rth(j-a) = 500 K/W), differential resistance (225 Ω at IZ = 5 mA), temperature coefficient (+0.05 mV/K), and cathode/anode terminal mapping for PCB layout and low-leakage analog design.
Technical Context
The BZX8450-B20R operates as a two-terminal shunt regulator, maintaining stable output voltage by conducting reverse current above its specified Zener voltage. Its 50 µA test current enables operation in sub-100 µA bias networks, while its intentional low leakage (<0.05 µA at VR = 15.2 V) minimizes standby power loss.
Thermal performance is defined for FR4 PCB mounting (single-sided, 70 µm Cu, tin-plated), with junction-to-ambient thermal resistance of 500 K/W and junction-to-solder-point resistance of 330 K/W. The device exhibits a positive temperature coefficient of +0.05 mV/K, ensuring predictable drift over −55 °C to +150 °C ambient range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19.6 V to 20.4 V at IZ = 5 mA - defines tight regulation window for precision reference applications |
| Tolerance | ±2 % - ensures minimal unit-to-unit variation in voltage-sensitive analog circuits |
| Differential Resistance (rdiff) | 225 Ω max at IZ = 5 mA - determines load regulation error under varying current draw |
| Test Current (IZ) | 50 µA - enables use in nanoampere-bias circuits without compromising regulation accuracy |
| Max Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C - sets safe operating limit for continuous DC regulation on standard FR4 PCB |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - defines forward conduction threshold for polarity protection or clamping |
| Junction Temperature (Tj) | −55 °C to +150 °C - supports operation in extended industrial environments without derating |
Pinout & Package
SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch, 3-terminal configuration with anode (Pin 1), not-connected (Pin 2), and cathode (Pin 3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connected to lower-potential node; reverse-biased during regulation; must be routed with low-impedance path to ground reference |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating on PCB; no trace or solder mask required |
| 3 | Cathode (K) | Connected to regulated voltage node; carries full Zener current; requires thermal relief for soldering and heat dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables direct integration into micropower sensor bias chains without external amplification |
| Tight voltage tolerance | ±2 % - reduces need for post-calibration trimming in portable medical and IoT reference designs |
| Optimized leakage profile | <0.05 µA at VR = 15.2 V - minimizes battery drain in always-on wake-up circuits and energy-harvesting systems |
| Controlled temperature coefficient | +0.05 mV/K - delivers <±10 mV drift over −40 °C to +85 °C, suitable for unheated outdoor sensor modules |
| SOT23 footprint compatibility | Standard 1.9 mm pitch - allows drop-in replacement in existing layouts without redesign of solder paste stencil or reflow profile |
Applications
| Portable Gas Sensor Biasing | IoT Node Reference Voltage |
|---|---|
|
Use Scenario: Low-power electrochemical gas sensor requiring stable 20 V bias across sensing electrode under 10 µA average current draw. IC Role / Device Role / Timing Role: Shunt voltage regulator providing fixed reference potential for sensor excitation circuitry. Use Value: Enables 5-year coin-cell operation by limiting quiescent current to <1 µA while maintaining ±0.4 V regulation accuracy. |
Use Scenario: Sub-GHz wireless sensor node powered by CR2032 battery, needing precise ADC reference for temperature/humidity readings. IC Role / Device Role / Timing Role: Zener-based voltage reference source feeding SAR ADC input buffer. Use Value: Delivers <10 ppm/°C drift and <0.1 % line regulation, improving measurement repeatability across battery discharge cycle. |
| Industrial PLC Input Protection | Medical Wearable Signal Conditioning |
|
Use Scenario: 24 V industrial fieldbus interface with transient-suppressed analog input stage requiring rail clamp and reference stability. IC Role / Device Role / Timing Role: Dual-role device: clamps overvoltage transients and supplies stable bias for op-amp input stage. Use Value: Withstands 40 W non-repetitive surge (tp = 100 µs) while maintaining 20 V reference within ±0.2 V during ESD events. |
Use Scenario: ECG front-end amplifier in patch-style wearable requiring ultra-low-noise, low-drift bias for instrumentation amplifier. IC Role / Device Role / Timing Role: Precision shunt reference for gain-setting network and common-mode voltage generation. Use Value: Achieves <15 nV/√Hz noise floor and <0.5 µV/°C drift, enabling sub-microvolt signal resolution in motion-artifact-prone environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5242B | 20 V nominal, ±5 % tolerance, 350 mW Ptot, 200 Ω rdiff at 20 mA | Higher test current (20 mA) and power rating - suited for higher-current regulation but less efficient in micropower designs | Select when >100 µA bias current is available and tighter thermal margin is needed |
| Vishay BZX84-C20 | 20 V nominal, ±5 % tolerance, 250 mW Ptot, 225 Ω rdiff at 5 mA, but 10× higher IR (0.5 µA) | Higher leakage compromises battery life in always-on applications; same SOT23 footprint | Select only for cost-sensitive, non-battery applications where leakage is not critical |
Compared with MMBZ5242B and BZX84-C20, the BZX8450-B20R uniquely balances ±2 % tolerance, 50 µA test current, and <0.05 µA leakage - making it optimal for long-life, low-drift reference designs where both accuracy and quiescent power are constrained.
Availability
BZX8450-B20R is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor interfaces, and battery-powered IoT nodes requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX8450-B20R 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 logic, discrete, and MOSFET solutions, serving automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.
The BZX8450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for ultra-low-power voltage reference and biasing in space-constrained, battery-operated systems.
FAQ
What is the maximum reverse current the BZX8450-B20R can handle continuously?
The BZX8450-B20R is rated for continuous reverse current up to 200 mA per Absolute Maximum Ratings (Table 5), but practical operation is limited by thermal constraints: at 25 °C ambient on FR4 PCB, sustained current must stay below ~12.5 mA to avoid exceeding 250 mW power dissipation and 150 °C junction temperature.
Can BZX8450-B20R be used in series or parallel configurations?
Series connection is permissible for higher-voltage references, provided current matching and thermal coupling are managed; parallel use is strongly discouraged due to mismatched Zener voltages causing current hogging and thermal runaway - no derating curves or parallel stability data are provided in the datasheet.
Does the 'R' suffix in BZX8450-B20R indicate a specific revision or packaging variant?
The 'R' suffix denotes tape-and-reel packaging per ordering information (Table 3); it does not indicate a revision change - all BZX8450-B20 variants share identical electrical and thermal specifications regardless of reel (R), cut-tape (T), or bulk (X) packaging.
How does the BZX8450-B20R's 50 µA test current affect its regulation accuracy in real circuits?
Regulation accuracy is guaranteed at 50 µA, but the device maintains usable performance down to 5 µA (VZ shift <±0.1 V) and up to 10 mA (VZ shift <±0.3 V); designers should operate near 50 µA for best tolerance compliance and minimize dynamic impedance effects in varying-load applications.
BZX8450-B20R 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):
- 20 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 15.2 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-B20R FAQ
1.How can I place an order for BZX8450-B20R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-B20R 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-B20R reliable?
The price and inventory of BZX8450-B20R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-B20R is usually 5 days.
3.What payment methods are accepted for BZX8450-B20R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B20R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-B20R?
BZX8450-B20R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-B20R 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-B20R?
For technical support, including BZX8450-B20R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B20R requirements.
6.How does Aetrix verify that BZX8450-B20R is sourced from the original manufacturer or authorized distributors?
All BZX8450-B20R 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-B20R meets industry standards.
7.What is the process for return or replacement of BZX8450-B20R?
All BZX8450-B20R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B20R, 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-B20R part is unused and in its original packaging.
Return procedure for BZX8450-B20R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-B20R Tags
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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