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Nexperia USA Inc. BZX8450-C56-QVL
- Part No.:
- BZX8450-C56-QVL
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C56-QVL.pdf
- Description:
- DIODE ZENER 56V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,737
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Product details
Overview
BZX8450-C56-QVL 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 delivers a nominal 56 V Zener voltage at 50 µA test current, with ±5 % tolerance, 250 mW total power dissipation, and qualified AEC-Q101 reliability.
For engineers reviewing the BZX8450-C56-QVL datasheet, BZX8450-C56-QVL pinout, BZX8450-C56-QVL application, or BZX8450-C56-QVL equivalent, this device serves as a stable, low-leakage voltage reference in battery-powered sensor nodes, ECU voltage monitoring circuits, and low-power analog front-ends where minimal quiescent current and automotive-grade robustness are required.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 56 V (min 53.2 V, max 58.8 V) at IZ = 50 µA. Its differential resistance is ≤ 400 Ω at IZ = 2 mA, and temperature coefficient is +0.05 mV/K - indicating near-zero thermal drift in the 51–56 V range per Table 9.
It features intentional leakage optimization per AN90031 for fast switching and noise reduction, and supports non-repetitive peak reverse power up to 40 W (100 µs pulse). Junction-to-ambient thermal resistance is 500 K/W on FR4 PCB, enabling operation up to 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 56 V nominal (53.2–58.8 V min/max), specified at 50 µA - enables ultra-low-bias voltage reference design |
| Tolerance | ±5 % (C-series) - provides predictable regulation margin for automotive supply rail monitoring |
| Power Dissipation Ptot | 250 mW at Tamb ≤ 25 °C - limits self-heating in compact SOT23 footprint on standard FR4 |
| Differential Resistance rdiff | ≤ 400 Ω at IZ = 2 mA - ensures stable output under small load variations in reference circuits |
| Reverse Current IR | ≤ 0.05 µA at VR = 51 V - minimizes standby power loss in always-on automotive modules |
| Forward Voltage VF | ≤ 0.9 V at IF = 10 mA - allows safe forward conduction during transient clamping or polarity protection |
| Junction Temperature | −55 °C to +150 °C - supports operation in engine bay and under-hood automotive environments |
Pinout & Package
SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch), rated for reflow and wave soldering per Figures 10–11.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connected to lower-potential node; reverse-biased during Zener operation |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating - no PCB trace or pad required |
| 3 | Cathode (K) | Connected to higher-potential node; defines regulated output reference point |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, HTRB, and ESD testing per JESD22 |
| Low test current specification | 50 µA Zener voltage rating - reduces system bias current by >95 % vs. 5 mA standard Zeners |
| Optimized leakage profile | Intentional minor leakage rise (per AN90031) improves switching speed and reduces broadband noise |
| Two tolerance options | ±2 % (B-series) and ±5 % (C-series) - balances cost and precision for different automotive subsystems |
| Thermal stability | +0.05 mV/K tempco at 56 V - maintains <0.3 % VZ shift over −40 °C to +125 °C ambient |
Applications
| Engine Control Unit (ECU) Reference | Automotive Cabin Sensor Node |
|---|---|
Use Scenario: Stable 56 V reference for ADC input scaling in 48 V mild-hybrid ECU power monitoring circuitry. IC Role / Device Role / Timing Role: Zener voltage reference providing fixed bias point for high-side current sense amplifier feedback network. Use Value: Enables accurate 0.5 % full-scale voltage measurement across 48 V bus with <1 µA quiescent draw - critical for ISO 26262 ASIL-B functional safety compliance. |
Use Scenario: Low-power voltage clamp and reference in tire pressure monitoring system (TPMS) RF transceiver power supply. IC Role / Device Role / Timing Role: Reverse-biased Zener regulating LDO input rail and absorbing transient spikes during RF burst transmission. Use Value: Maintains 56 V clamp threshold with <0.05 µA leakage at 51 V, extending coin-cell battery life beyond 10 years while surviving ISO 7637-2 pulse 5a transients. |
| ADAS Camera Power Sequencing | Electric Power Steering (EPS) Feedback Circuit |
Use Scenario: Precision reference for dual-supply sequencing controller in 12 V/56 V camera module with HDR image sensor. IC Role / Device Role / Timing Role: Provides stable 56 V reference for comparator hysteresis setting during power-up ramp detection. Use Value: Ensures reliable 56 V rail validation within ±0.5 V tolerance across −40 °C to +105 °C, preventing false power-fail assertions during cold cranking. |
Use Scenario: Voltage reference for torque sensor signal conditioning in EPS motor control unit with isolated CAN interface. IC Role / Device Role / Timing Role: Supplies bias to instrumentation amplifier gain-setting network referenced to 56 V auxiliary supply. Use Value: Delivers <0.1 % long-term drift over 15-year vehicle lifetime due to AEC-Q101 stress qualification and low-tempco design - meeting ASIL-C torque accuracy 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 |
|---|---|---|---|
| BZX84-C56 | Non-AEC-Q101, ±5 % tolerance, same VZ and SOT23 package but lacks automotive qualification and optimized leakage profile | Restricted to industrial or consumer use; not approved for under-hood deployment | Select only for cost-sensitive non-automotive designs where AEC-Q101 is not mandated |
| MMSZ5256ET1G | ±5 % tolerance, 500 mW Ptot, 56 V VZ at 10 mA - higher test current increases bias consumption 200× vs. BZX8450-C56-QVL | Unsuitable for ultra-low-power applications; thermal resistance 400 K/W requires larger copper area | Choose only when higher power handling or legacy footprint compatibility outweighs battery-life impact |
Compared with BZX84-C56 and MMSZ5256ET1G, the BZX8450-C56-QVL uniquely combines AEC-Q101 qualification, 50 µA test current, and intentional leakage optimization - making it the sole option for automotive-grade, multi-decade battery-powered reference applications requiring sub-microwatt bias and transient-noise resilience.
Availability
BZX8450-C56-QVL is available at Aetrix Electronics and suitable for automotive ECU reference design, ADAS camera power sequencing, and electric power steering feedback circuits requiring stable component supply with full traceability and lifecycle continuity.
Supply support for BZX8450-C56-QVL 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 essential efficiency-enhancing components, with leadership in logic, discrete, and MOSFET technologies for automotive, industrial, and mobile markets.
The BZX8450-Q series belongs to Nexperia's automotive-qualified Zener portfolio, engineered specifically for low-current, high-stability voltage reference in harsh-environment electronics where AEC-Q101 reliability and microamp-level bias are mandatory.
FAQ
What is the maximum reverse voltage the BZX8450-C56-QVL can withstand before breakdown?
The BZX8450-C56-QVL 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 ~565 V at 71 mA peak current. Continuous reverse voltage must remain below 53.2 V to avoid unregulated conduction.
Is Pin 2 truly unused, and can it be left unconnected on the PCB?
Yes, Pin 2 is internally not connected (n.c.) per Table 2 and Figure 9. It must remain electrically floating - no PCB trace, solder mask opening, or thermal pad should contact it. The SOT23 footprint in Figure 10 explicitly omits solder paste and copper for Pin 2, confirming its isolation. Connecting it risks mechanical stress or unintended parasitic coupling.
How does the "intentional minor rise of leakage current" improve noise performance?
Per Application Note AN90031, the controlled increase in leakage current (e.g., 0.05 µA at 51 V) reduces carrier trapping/detrapping effects in the depletion region, lowering 1/f flicker noise and improving high-frequency spectral purity. This enables cleaner reference signals in RF-coupled sensor interfaces like TPMS and radar modules without requiring external filtering.
Can the BZX8450-C56-QVL be used in parallel for higher power dissipation?
No - Zener diodes exhibit negative temperature coefficients and manufacturing spread, causing current hogging when paralleled. Even with matched units, thermal runaway occurs above ~100 mW combined dissipation. For >250 mW needs, use a single higher-rated device (e.g., BZX85-C56) or active regulation; do not parallel BZX8450-C56-QVL units.
BZX8450-C56-QVL 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX8450-C56-QVL FAQ
1.How can I place an order for BZX8450-C56-QVL through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C56-QVL 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-QVL reliable?
The price and inventory of BZX8450-C56-QVL 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-QVL is usually 5 days.
3.What payment methods are accepted for BZX8450-C56-QVL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C56-QVL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C56-QVL?
BZX8450-C56-QVL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C56-QVL 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-QVL?
For technical support, including BZX8450-C56-QVL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C56-QVL requirements.
6.How does Aetrix verify that BZX8450-C56-QVL is sourced from the original manufacturer or authorized distributors?
All BZX8450-C56-QVL 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-QVL meets industry standards.
7.What is the process for return or replacement of BZX8450-C56-QVL?
All BZX8450-C56-QVL units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C56-QVL, 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-QVL part is unused and in its original packaging.
Return procedure for BZX8450-C56-QVL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-C56-QVL Tags
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