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Nexperia USA Inc. BZX8450-C56-QR
- Part No.:
- BZX8450-C56-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C56-QR.pdf
- Description:
- DIODE ZENER 56V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,222
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Product details
Overview
BZX8450-C56-QR from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision biasing and voltage reference in automotive and portable electronics. It provides a nominal 56 V regulation at 50 µA test current, with ±5 % tolerance, 250 mW total power dissipation, and qualified AEC-Q101 reliability.
For engineers reviewing the BZX8450-C56-QR datasheet, BZX8450-C56-QR pinout, BZX8450-C56-QR application, or BZX8450-C56-QR equivalent, this page delivers verified electrical characteristics, thermal behavior, automotive qualification status, and real-world design constraints for low-power voltage stabilization circuits.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage under low-current conditions (IZ = 50 µA), making it suitable for battery-powered sensor biasing and microcontroller reference rails. Its differential resistance of 400 Ω at IZ = 2 mA and temperature coefficient of +0.05 mV/K support predictable regulation across ambient ranges.
The device features intentional leakage optimization per AN90031 for reduced noise and faster switching transients. With junction-to-ambient thermal resistance of 500 K/W on FR4 PCB and non-repetitive peak reverse power dissipation up to 40 W (tp = 100 µs), it withstands transient overvoltage events in automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 56 V at IZ = 50 µA - defines precise regulation point for high-voltage reference circuits |
| Tolerance | ±5 % - enables cost-effective selection for non-critical voltage references where tighter tolerance is unnecessary |
| Total Power Dissipation | 250 mW at Tamb ≤ 25 °C - limits continuous operation to low-power applications without heatsinking |
| Differential Resistance | 400 Ω at IZ = 2 mA - determines output impedance and load regulation sensitivity |
| Reverse Current | 0.05 µA at VR = 47.6 V - ensures minimal quiescent current draw in always-on monitoring circuits |
| Junction Temperature Range | −55 °C to +150 °C - supports operation in under-hood automotive environments |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
Package: SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch), optimized for automated assembly and space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in reverse-bias regulation configuration |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating-no PCB trace or solder joint required |
| 3 | Cathode (K) | Reverse-bias input terminal; connects to higher-potential supply rail for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables use in ultra-low-power systems such as coin-cell IoT sensors |
| Optimized leakage profile | Intentional minor rise per AN90031 - reduces switching noise in ADC reference paths and timing circuits |
| Automotive qualification | AEC-Q101 compliant - eliminates need for additional qualification testing in Tier-1 automotive designs |
| Thermal performance | Rth(j-a) = 500 K/W on FR4 - allows direct placement on standard PCB without thermal vias in low-duty-cycle applications |
Applications
| Automotive Cabin Sensors | Portable Medical Monitors |
|---|---|
Use Scenario: Voltage reference for analog front-end of cabin temperature/humidity sensors in HVAC control modules. IC Role / Device Role / Timing Role: Zener reference diode providing stable 56 V bias for op-amp gain-setting networks and ADC reference dividers. Use Value: AEC-Q101 qualification ensures long-term stability across −40 °C to +105 °C operating range without derating. |
Use Scenario: Low-power voltage clamp in battery-operated pulse oximeter signal conditioning stage. IC Role / Device Role / Timing Role: Reverse-bias protection and reference element for photodiode transimpedance amplifier biasing. Use Value: 50 µA test current enables operation from single CR2032 cell with <1 µA standby leakage impact. |
| Industrial PLC Input Modules | Smart Meter Auxiliary Power |
Use Scenario: Overvoltage clamping and reference generation for 24 V DC digital input protection circuits. IC Role / Device Role / Timing Role: Zener regulator stabilizing internal LDO input rail during line transients. Use Value: 40 W non-repetitive surge rating (tp = 100 µs) absorbs IEC 61000-4-4 fast transient bursts without failure. |
Use Scenario: High-voltage auxiliary supply rail stabilization in polyphase smart meter metering IC power domains. IC Role / Device Role / Timing Role: Precision 56 V reference for isolated flyback feedback divider network. Use Value: ±5 % tolerance and +0.05 mV/K TC enable accurate scaling of 100–277 V AC mains-derived rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C56 | Non-AEC-Q101; same 56 V, ±5 %, SOT23 but lacks automotive qualification and optimized leakage profile | Suitable only for commercial-grade consumer or industrial equipment without automotive reliability requirements | Select when AEC-Q101 is not mandated and cost is primary constraint |
| MMSZ5256B | Same 56 V, ±5 %, SOT23, but rated at 500 mW Ptot and specified at 20 mA test current - higher power, higher leakage | Better for higher-current regulation; unsuitable for ultra-low-power biasing due to 10× higher test current | Choose when circuit requires >250 mW dissipation or higher Zener current stability |
Compared with BZX8450-C56-QR, BZX84-C56 omits automotive qualification and noise-optimized leakage, while MMSZ5256B trades low-bias capability for higher power handling - making the BZX8450-C56-QR uniquely suited for AEC-Q101-compliant, battery-sensitive 56 V reference designs.
Availability
BZX8450-C56-QR is available at Aetrix Electronics and suitable for automotive cabin electronics, portable medical instrumentation, industrial PLC input protection, and smart meter auxiliary power supply requiring stable component supply with full traceability and lifecycle continuity.
Supply support for BZX8450-C56-QR 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, with leadership in automotive-qualified components and efficient manufacturing.
The BZX8450-Q series belongs to Nexperia's automotive-grade Zener diode product line, engineered specifically for low-current voltage reference and regulation in harsh-environment applications where AEC-Q101 compliance and low-leakage performance are mandatory.
FAQ
What is the maximum reverse voltage before breakdown for BZX8450-C56-QR?
The nominal Zener voltage is 56 V, with a guaranteed range of 53.2 V to 58.8 V (±5 %) at IZ = 50 µA. Breakdown begins within this band; operation below 53.2 V yields negligible reverse current (<0.05 µA), while exceeding 58.8 V risks exceeding limiting values per Table 5.
Can BZX8450-C56-QR be used in forward conduction mode?
Yes - its forward voltage is 0.9 V at IF = 10 mA, matching standard silicon diode behavior. However, it is not optimized for rectification; its primary function is reverse-bias Zener regulation, and forward use should be limited to low-current biasing or protection clamping where 0.9 V VF is acceptable.
Is pin 2 truly unused, or does it require grounding?
Pin 2 is internally not connected (n.c.), as confirmed in Table 2 and Figure 9. It must remain electrically floating - no connection to ground, power, or any other net. PCB layout must omit solder mask and copper at this pad to prevent accidental shorting or parasitic coupling.
How does the "intentional minor rise of leakage current" improve performance?
Per AN90031, this controlled leakage enhances carrier sweep-out during switching transitions, reducing recovery time and high-frequency noise in reference paths. It improves signal integrity in precision analog circuits like ADC references and op-amp bias networks without compromising DC regulation accuracy.
BZX8450-C56-QR 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX8450-C56-QR FAQ
1.How can I place an order for BZX8450-C56-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C56-QR 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-C56-QR reliable?
The price and inventory of BZX8450-C56-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-C56-QR is usually 5 days.
3.What payment methods are accepted for BZX8450-C56-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C56-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C56-QR?
BZX8450-C56-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C56-QR 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-C56-QR?
For technical support, including BZX8450-C56-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C56-QR requirements.
6.How does Aetrix verify that BZX8450-C56-QR is sourced from the original manufacturer or authorized distributors?
All BZX8450-C56-QR 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-C56-QR meets industry standards.
7.What is the process for return or replacement of BZX8450-C56-QR?
All BZX8450-C56-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C56-QR, 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-C56-QR part is unused and in its original packaging.
Return procedure for BZX8450-C56-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-C56-QR Tags
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MMBZ5240B-7-F
Diodes Incorporated
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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
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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