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Nexperia USA Inc. BZX8450-C56VL
- Part No.:
- BZX8450-C56VL
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C56VL.pdf
- Description:
- DIODE ZENER 56V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,304
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Product details
Overview
BZX8450-C56VL from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision voltage reference and biasing in portable electronics. It delivers a nominal 56 V Zener voltage at 50 µA test current, with ±5 % tolerance, 250 mW total power dissipation, and 400 Ω differential resistance at 2 mA - enabling stable regulation in battery-powered sensor nodes and low-power microcontroller reset circuits.
For engineers reviewing the BZX8450-C56VL datasheet, BZX8450-C56VL pinout, BZX8450-C56VL application, or BZX8450-C56VL equivalent, key selection criteria include its low-test-current specification (50 µA), intentional leakage optimization for noise reduction per AN90031, SOT23 footprint compatibility, and thermal resistance of 330 K/W to solder point - critical for space-constrained, thermally sensitive designs.
Technical Context
This device operates as a reverse-biased Zener diode with specified breakdown at 56 V (min 53.2 V, max 58.8 V) under IZ = 50 µA, exhibiting a positive temperature coefficient of +11.2 mV/K. Its differential resistance remains ≤400 Ω at IZ = 2 mA, ensuring tight regulation under light load conditions.
Designed for low-bias operation, it features intentionally elevated leakage current versus standard B-series parts to improve switching speed and reduce noise - a documented behavior confirmed in Application Note AN90031. The SOT23-3 package includes a dedicated cathode terminal and internal non-connected pin (Pin 2), supporting unidirectional voltage clamping with minimal parasitic capacitance (≤40 pF at VR = 0 V, f = 1 MHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 56 V nominal (53.2–58.8 V range at IZ = 50 µA); enables precise high-voltage reference in low-power analog front-ends. |
| Tolerance | ±5 % (C-series); supports cost-sensitive applications where tighter tolerance is not required. |
| Differential Resistance rdiff | ≤400 Ω at IZ = 2 mA; maintains regulation stability across small load variations in sensor bias networks. |
| Power Dissipation Ptot | 250 mW at Tamb ≤ 25 °C on FR4 PCB; defines maximum continuous DC power handling in standard layout. |
| Forward Voltage VF | ≤0.9 V at IF = 10 mA; ensures low conduction loss when used in forward-biased protection or level-shifting roles. |
| Thermal Resistance Rth(j-sp) | 330 K/W to cathode solder point; informs thermal design margin for sustained operation near ambient limits. |
| Reverse Current IR | ≤0.05 µA at VR = 44.8 V; guarantees minimal quiescent current draw in always-on voltage monitor circuits. |
Pinout & Package
SOT23-3 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch), optimized for automated assembly and thermal performance on single-sided FR4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential node; reverse-biased during Zener operation; must be held at voltage ≤ VZ − 0.7 V relative to cathode. |
| 2 | Not Connected (n.c.) | Internally isolated; no electrical function; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress. |
| 3 | Cathode (K) | Connects to higher-potential node; carries full Zener current; serves as primary thermal path to PCB copper via solder joint. |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current Zener specification | Rated at IZ = 50 µA - enables accurate voltage setting in nanoampere-bias circuits like comparator references. |
| Optimized leakage profile | Intentional minor rise in IR (vs. B-series) reduces switching transients and broadband noise per AN90031. |
| Thermally efficient SOT23 layout | Rth(j-sp) = 330 K/W to cathode tab - allows >100 °C junction rise with only 33 °C PCB temperature increase at 100 mW. |
| High-voltage Zener capability | 56 V rating with 40 W non-repetitive surge capacity (tp = 100 µs) - supports transient overvoltage clamping in industrial I/O protection. |
| Standard marking compatibility | Marked "LV%" per Table 4 - enables automated optical inspection and traceability in high-volume manufacturing. |
Applications
| Industrial Sensor Biasing | Microcontroller Reset Reference |
|---|---|
|
Use Scenario: Providing stable 56 V bias to photodiode amplifiers in smoke detectors and gas analyzers operating from 24 V rails with boost converters. IC Role / Device Role / Timing Role: Zener voltage reference establishing fixed reverse-bias potential for high-impedance sensing elements. Use Value: Low 50 µA test current minimizes loading on high-efficiency boost converter outputs, preserving battery life in wireless sensor nodes. |
Use Scenario: Generating a clean, temperature-stable threshold for brown-out detection in ARM Cortex-M0+ MCUs powered by Li-ion batteries. IC Role / Device Role / Timing Role: Precision voltage reference feeding comparator input in power-monitoring circuitry. Use Value: ±5 % tolerance and +11.2 mV/K TC ensure predictable reset activation across −40 °C to +85 °C without calibration. |
| Portable Equipment Overvoltage Clamp | Low-Power Analog Front-End Protection |
|
Use Scenario: Clamping induced surges on RS-485 data lines in handheld test equipment exposed to ESD events. IC Role / Device Role / Timing Role: Transient voltage suppressor limiting line-to-ground voltage to 56 V peak. Use Value: 40 W non-repetitive surge rating (100 µs pulse) absorbs IEC 61000-4-2 contact discharge energy without degradation. |
Use Scenario: Protecting ADC input stages in battery-operated medical wearables from accidental 12 V misconnection. IC Role / Device Role / Timing Role: Reverse-biased shunt limiter diverting fault current away from sensitive analog inputs. Use Value: 40 pF capacitance at 0 V ensures <1 % signal distortion up to 10 MHz, preserving integrity of bio-signal acquisition. |
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-C56 | Same 56 V, ±5 %, SOT23 package but rated at IZ = 5 mA; rdiff = 100 Ω (lower), leakage <0.1 µA (tighter). | Requires higher bias current; less suitable for ultra-low-power systems but offers better regulation under moderate loads. | Select when load current exceeds 100 µA and tighter dynamic regulation is prioritized over quiescent current. |
| MMSZ5256B | 56 V, ±5 %, SOD-123 package; Ptot = 500 mW; rdiff = 110 Ω at 20 mA; higher power handling but larger footprint. | Supports higher continuous power but occupies 2.5× more board area; thermal resistance ~400 K/W (worse). | Choose when system-level power dissipation exceeds 250 mW or existing layout accommodates SOD-123. |
Compared with BZX84-C56, BZX8450-C56VL trades lower dynamic impedance for 10× reduced test current - making it superior for nanowatt biasing but inferior for load regulation. Versus MMSZ5256B, it sacrifices power headroom for 40 % smaller footprint and better thermal coupling to PCB.
Availability
BZX8450-C56VL is available at Aetrix Electronics and suitable for industrial sensor biasing, microcontroller reset reference, portable equipment overvoltage clamp, and low-power analog front-end protection requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX8450-C56VL 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 devices with focus on efficiency, miniaturization, and robustness.
The BZX8450 series belongs to Nexperia's low-current Zener regulator portfolio, engineered specifically for battery-powered and space-constrained applications demanding precision voltage references at microampere bias levels.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX8450-C56VL has a nominal Zener voltage of 56 V, with guaranteed minimum and maximum values of 53.2 V and 58.8 V respectively at IZ = 50 µA. Its absolute maximum non-repetitive peak reverse voltage is defined by the 40 W surge rating at 100 µs pulse width, corresponding to ~126 V peak for that duration. Continuous reverse operation above 58.8 V risks thermal runaway.
Can Pin 2 be connected to ground or left floating in PCB layout?
Pin 2 is internally not connected (n.c.) and must remain unconnected on the PCB - neither grounded nor routed. Connecting it may introduce parasitic capacitance, mechanical stress on the die bond wire, or unintended current paths. The SOT23 outline explicitly defines Pin 2 as electrically isolated; standard footprint libraries reflect this as an open pad.
How does the "C" suffix differ from "B" in the BZX8450 series?
The "C" suffix denotes ±5 % tolerance and intentional minor leakage current elevation for improved switching speed and noise reduction, as documented in Application Note AN90031. In contrast, "B" parts offer ±2 % tolerance and lower leakage, optimized for highest precision rather than dynamic performance. Both share identical package, power rating, and thermal characteristics.
Is this device suitable for automotive applications?
No. The BZX8450-C56VL is not AEC-Q200 qualified and lacks automotive-grade screening, temperature validation beyond −55 °C to +150 °C ambient, or failure-in-time (FIT) data for automotive use cases. Nexperia explicitly states in its legal disclaimers that non-automotive qualified products are unsuitable for safety-critical or life-support systems - including automotive ECUs, ADAS sensors, or infotainment power rails.
BZX8450-C56VL 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:
- 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-C56VL FAQ
1.How can I place an order for BZX8450-C56VL through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C56VL 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-C56VL reliable?
The price and inventory of BZX8450-C56VL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-C56VL is usually 5 days.
3.What payment methods are accepted for BZX8450-C56VL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C56VL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C56VL?
BZX8450-C56VL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C56VL 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-C56VL?
For technical support, including BZX8450-C56VL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C56VL requirements.
6.How does Aetrix verify that BZX8450-C56VL is sourced from the original manufacturer or authorized distributors?
All BZX8450-C56VL 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-C56VL meets industry standards.
7.What is the process for return or replacement of BZX8450-C56VL?
All BZX8450-C56VL units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C56VL, 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-C56VL part is unused and in its original packaging.
Return procedure for BZX8450-C56VL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-C56VL 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
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BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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