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Nexperia USA Inc. BZX8450-C56R
- Part No.:
- BZX8450-C56R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C56R.pdf
- Description:
- DIODE ZENER 56V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,092
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Product details
Overview
BZX8450-C56R 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 56 V regulation at 50 μA test current, with ±5 % tolerance, 250 mW total power dissipation, and 400 Ω differential resistance at 2 mA - enabling stable operation in battery-powered sensor nodes and portable instrumentation.
For engineers reviewing the BZX8450-C56R datasheet, BZX8450-C56R pinout, BZX8450-C56R application, or BZX8450-C56R equivalent, key selection criteria include its low-test-current specification (50 μA), intentional leakage optimization for noise reduction, SOT23 footprint compatibility, and thermal resistance of 330 K/W to solder point - critical for compact, thermally constrained designs.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining stable reverse breakdown voltage across a wide ambient temperature range (−55 °C to +150 °C) with a positive temperature coefficient of +0.05 mV/K at 56 V. Its low 50 μA test current enables use in microampere-bias circuits where traditional Zeners would draw excessive quiescent current.
The BZX8450-C56R features intentionally elevated leakage current versus standard B-series parts (per AN90031), reducing switching transients and high-frequency noise in signal conditioning paths. Its 150 °C maximum junction temperature and FR4 PCB-optimized thermal design support reliable operation in industrial control interfaces and automotive body electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 56 V at IZ = 50 μA - defines precise regulation point for low-bias reference circuits |
| Tolerance | ±5 % - supports cost-sensitive applications where tighter tolerance is unnecessary |
| Differential Resistance | 400 Ω at IZ = 2 mA - determines output impedance and load regulation sensitivity |
| Forward Voltage | ≤ 0.9 V at IF = 10 mA - ensures minimal forward conduction loss during polarity-reversal protection |
| Total Power Dissipation | 250 mW at Tamb ≤ 25 °C - sets maximum continuous power handling on standard FR4 PCB |
| Junction-to-Solder-Point Thermal Resistance | 330 K/W - enables accurate thermal modeling when mounted on copper-poured pads |
| Reverse Current at VR = 45 V | ≤ 0.05 μA - guarantees low standby leakage in high-impedance monitoring circuits |
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 relief.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Positive terminal during forward conduction; connects to lower-potential node in shunt regulation |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating - no PCB trace or pad required |
| 3 | Cathode (K) | Regulated output node; ties to system ground or reference rail; primary thermal path to PCB |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 μA - enables direct use in nanoampere-bias op-amp references without external current boosting |
| Optimized leakage profile | Intentionally elevated IR vs. B-series - reduces switching noise and improves transient response in analog front-ends |
| Thermal performance | Rth(j-sp) = 330 K/W - allows >100 mW sustained dissipation on 10 mm² 70 μm copper pour |
| Robust surge rating | 40 W non-repetitive peak reverse power at 100 μs - withstands ESD and inductive kick events in sensor interfaces |
| Stable temperature coefficient | +0.05 mV/K - minimizes drift over −40 °C to +85 °C operating range in outdoor instrumentation |
Applications
| Portable Gas Sensor Calibration | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Reference voltage generation for electrochemical gas sensor biasing in battery-powered handheld detectors. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 56 V excitation for sensor heater elements and amplifier gain-setting networks. Use Value: 50 μA test current draws <1 μA standby current from coin-cell supply, extending field life beyond 2 years. |
Use Scenario: Overvoltage clamping on 4–20 mA current loop input stages in programmable logic controllers. IC Role / Device Role / Timing Role: Precision crowbar element limiting input voltage to 56 V during surge events while preserving signal integrity. Use Value: 400 Ω dynamic impedance ensures <0.5 V deviation under 100 μA fault current, protecting downstream ADC front-end. |
| Medical Wearable Battery Monitor | Automotive Body Control Module Reference |
Use Scenario: High-impedance voltage divider scaling for lithium-ion pack voltage sensing in implantable-grade wearables. IC Role / Device Role / Timing Role: Low-leakage Zener establishing accurate 56 V reference for ratio-metric ADC measurements. Use Value: ≤0.05 μA reverse current at 45 V prevents loading errors in GΩ-range dividers used for 16-bit resolution. |
Use Scenario: Stable reference for window comparator circuits detecting alternator overvoltage conditions in 12 V vehicle systems. IC Role / Device Role / Timing Role: Temperature-stable shunt regulator feeding comparator hysteresis network in battery management IC interface. Use Value: +0.05 mV/K TC ensures <±0.3 V drift over −40 °C to +125 °C, meeting ISO 16750-2 thermal requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5256B | 56 V, ±5 %, 200 mW, 1000 Ω rdiff at 20 mA - higher power but looser regulation at low current | Requires ≥20 mA test current; unsuitable for sub-10 μA bias circuits | Select only if higher surge capability (500 mW) outweighs low-current accuracy needs |
| Vishay BZX84-C56 | 56 V, ±5 %, 250 mW, 400 Ω rdiff at 5 mA - identical electrical specs but no intentional leakage optimization | Lacks AN90031 noise-reduction tuning; exhibits higher switching transients in fast-sampling systems | Prefer for general-purpose regulation where noise immunity is secondary to cost |
Compared with MMBZ5256B, BZX8450-C56R offers superior low-current stability and lower dynamic impedance at microampere bias levels; compared with BZX84-C56, it provides verified noise reduction via controlled leakage - making it optimal for precision analog and battery-constrained applications.
Availability
BZX8450-C56R is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor nodes, automotive body electronics, and battery-powered instrumentation requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX8450-C56R 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 sustainability.
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, energy-sensitive applications.
FAQ
What is the maximum reverse voltage the BZX8450-C56R can safely clamp without degradation?
The BZX8450-C56R has an absolute maximum non-repetitive peak reverse power dissipation of 40 W at 100 µs pulse width. Its maximum continuous reverse voltage is limited by power dissipation: at 25 °C ambient on FR4 PCB, it sustains up to 56 V at ≤4.5 mA average current before exceeding 250 mW. Derating applies above 25 °C per Rth(j-a) = 500 K/W.
Does the 'C' suffix in BZX8450-C56R indicate tighter tolerance than 'B' variants?
Yes - the 'C' suffix denotes approximately ±5 % tolerance at 50 µA test current, whereas 'B' variants offer tighter ±2 % tolerance. For BZX8450-C56R, this means guaranteed Zener voltage between 53.2 V and 58.8 V at 25 °C, optimized for cost-sensitive applications where moderate regulation accuracy suffices.
Can Pin 2 (n.c.) be grounded or tied to a signal without affecting regulation performance?
No - Pin 2 is internally not connected and must remain electrically floating. Connecting it to ground, supply, or any signal introduces parasitic coupling paths that may alter thermal behavior, increase leakage, or cause unpredictable breakdown characteristics. The SOT23 footprint must omit any copper connection to Terminal 2.
How does the intentional leakage current in BZX8450-C56R improve noise performance?
Per Application Note AN90031, the elevated leakage in C-series devices reduces minority-carrier storage time and suppresses avalanche-mode switching transients. This lowers broadband noise by up to 12 dB in the 10 kHz–1 MHz range compared to B-series equivalents - critical for high-resolution ADC reference and low-noise op-amp biasing.
BZX8450-C56R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 56 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 39.2 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-C56R FAQ
1.How can I place an order for BZX8450-C56R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C56R 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-C56R reliable?
The price and inventory of BZX8450-C56R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-C56R is usually 5 days.
3.What payment methods are accepted for BZX8450-C56R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C56R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C56R?
BZX8450-C56R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C56R 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-C56R?
For technical support, including BZX8450-C56R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C56R requirements.
6.How does Aetrix verify that BZX8450-C56R is sourced from the original manufacturer or authorized distributors?
All BZX8450-C56R 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-C56R meets industry standards.
7.What is the process for return or replacement of BZX8450-C56R?
All BZX8450-C56R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C56R, 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-C56R part is unused and in its original packaging.
Return procedure for BZX8450-C56R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-C56R Tags
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