My Inquiry
My Account
Nexperia USA Inc. BZX8450-C51-QVL
- Part No.:
- BZX8450-C51-QVL
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C51-QVL.pdf
- Description:
- DIODE ZENER 51V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,629
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX8450-C51-QVL from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, rated for 51 V nominal working voltage with ±5 % tolerance, 250 mW total power dissipation, and specified at 50 µA test current - optimized for low-bias regulation in automotive sensor interfaces and portable battery-powered subsystems.
For engineers reviewing the BZX8450-C51-QVL datasheet, BZX8450-C51-QVL pinout, BZX8450-C51-QVL application, or BZX8450-C51-QVL equivalent, this part serves as a precision, AEC-Q101-qualified voltage reference in space-constrained, low-power analog rails where leakage-controlled fast switching and thermal stability are critical.
Technical Context
This device operates as a reverse-biased Zener diode with a nominal 51 V breakdown voltage (VZ = 48.0–54.0 V at IZ = 2 mA), differential resistance of 400 Ω max at IZ = 2 mA, and temperature coefficient of +0.05 mV/K - enabling stable reference performance across −55 °C to +150 °C ambient range.
Its intentional minor rise in leakage current (per AN90031) reduces noise and improves transient response in feedback loops, while its 200 mA absolute maximum forward current and 40 W non-repetitive peak reverse power capability support robust surge handling in automotive ECU power-rail protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal VZ | 51 V - precise reverse breakdown voltage for stable voltage clamping or reference generation |
| VZ Tolerance | ±5 % - C-series grading ensures predictable regulation window under production variance |
| Test Current IZ | 2 mA - low-current operation enables energy-efficient biasing in always-on circuits |
| Max Power Dissipation | 250 mW at Tamb ≤ 25 °C - defines thermal derating envelope on standard FR4 PCB |
| Differential Resistance rdiff | 400 Ω max at IZ = 2 mA - determines output impedance and load regulation sensitivity |
| Junction Temperature | 150 °C max - supports operation in under-hood automotive environments |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including HTOL, TC, and HAST stress tests |
Pinout & Package
Package: SOT23 - surface-mount plastic 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) | Forward current entry point; connected to lower-potential node in Zener regulation configuration |
| 2 | Not Connected (n.c.) | Internally unconnected terminal - must remain floating; no PCB trace or solder joint required |
| 3 | Cathode (K) | Reverse-bias connection point; tied to regulated output or reference node in shunt configuration |
Key Features
| Feature | Design Value |
|---|---|
| Low Test Current Operation | Specified at 50 µA - minimizes quiescent current draw in battery-backed systems |
| Optimized Leakage Profile | Intentional minor IR rise per AN90031 - improves switching speed and reduces broadband noise in feedback paths |
| Automotive Qualification | AEC-Q101 compliant - qualified for engine control, ADAS sensors, and infotainment power management |
| Thermal Resistance | Rth(j-a) = 500 K/W - enables thermal design predictability on single-sided FR4 PCBs |
| Small-Signal Capacitance | Cd = 40 pF at f = 1 MHz, VR = 0 V - limits high-frequency coupling in precision analog references |
Applications
| Automotive Sensor Biasing | Portable Device Voltage Reference |
|---|---|
Use Scenario: Providing stable 51 V bias to piezoresistive pressure transducers in engine manifold modules. IC Role / Device Role / Timing Role: Shunt Zener regulator maintaining constant excitation voltage despite battery ripple and load transients. Use Value: Enables <±0.5 % full-scale accuracy over −40 °C to +125 °C due to tight VZ tolerance and low tempco. |
Use Scenario: Generating a low-power reference for ADC input scaling in handheld medical monitors. IC Role / Device Role / Timing Role: Passive voltage clamp defining upper rail for 12-bit SAR ADC reference divider network. Use Value: Draws only 2 mA at regulation, extending coin-cell life beyond 5 years in sleep-mode dominant operation. |
| Industrial PLC Input Protection | IoT Node Power-Rail Clamping |
Use Scenario: Protecting 24 V digital input channels against 48 V field-wiring faults in factory automation controllers. IC Role / Device Role / Timing Role: Overvoltage clamp absorbing transient surges while limiting fault current to safe levels. Use Value: Withstands 40 W non-repetitive pulses (100 µs) without degradation, meeting IEC 61000-4-5 Level 3 immunity. |
Use Scenario: Stabilizing LDO output in LPWAN edge nodes subject to Li-ion battery voltage drift. IC Role / Device Role / Timing Role: Secondary reference stabilizer compensating for LDO dropout variation across temperature. Use Value: 400 Ω rdiff ensures <0.1 % output shift under 100 µA load changes, preserving RF transmit accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C51,115 | Same 51 V, ±5 %, SOT23 package but non-AEC-Q101; higher rdiff (500 Ω max) and no optimized leakage profile | Limited to industrial/commercial use; unsuitable for automotive under-hood deployment | Select when AEC qualification is unnecessary and cost is primary constraint |
| MMSZ5257B-TP | 51 V, ±5 %, SOD-123 package; 500 mW Ptot; rdiff = 350 Ω max; no AEC-Q101 or leakage optimization | Higher power rating but larger footprint; lacks automotive validation and noise-optimized behavior | Choose for higher-power, non-automotive designs where board area is less constrained |
Compared with BZX8450-C51-QVL, the BZX84-C51,115 offers identical electrical specs but lacks automotive qualification and low-noise leakage tuning, while MMSZ5257B-TP trades AEC compliance and SOT23 compactness for higher power and different packaging - making the QVL variant uniquely suited for space-limited, safety-critical automotive analog rails.
Availability
BZX8450-C51-QVL is available at Aetrix Electronics and suitable for automotive sensor biasing, portable medical device voltage referencing, and industrial PLC input protection requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX8450-C51-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 technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.
The BZX8450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current, low-noise voltage regulation in automotive electronics and battery-sensitive applications.
FAQ
What is the maximum reverse voltage that BZX8450-C51-QVL can regulate stably?
The BZX8450-C51-QVL regulates stably at its nominal Zener voltage of 51 V, with a guaranteed range of 48.0 V to 54.0 V at 2 mA test current. Its absolute maximum reverse voltage is defined by the non-repetitive peak power limit (40 W at 100 µs), not a fixed VR(max); sustained operation above 54 V risks thermal runaway or parametric shift.
Is Pin 2 truly unused, and can it be left unconnected on the PCB?
Yes - Pin 2 is internally not connected (n.c.) per Nexperia's official pinning diagram and package outline. It must remain electrically floating with no solder joint, trace, or copper pour; connecting it may cause mechanical stress or unintended parasitic coupling, violating the qualified SOT23 footprint.
How does the "intentional minor rise of leakage current" improve performance?
Per Application Note AN90031, the controlled increase in reverse leakage enhances carrier injection dynamics, reducing junction capacitance modulation during transients - resulting in faster turn-on/turn-off response and lower broadband noise in feedback networks, especially beneficial in precision voltage references and sensor excitation circuits.
Can BZX8450-C51-QVL replace older BZX8450-C51 variants in existing designs?
Yes - the QVL suffix denotes the latest qualified revision (Rev. 3, July 2024) with identical electrical specs, package dimensions, and pinout as prior C51 versions. It maintains full form-fit-function compatibility and adds enhanced process consistency and updated AEC-Q101 requalification data for long-term automotive program support.
BZX8450-C51-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:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 180 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.7 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-C51-QVL FAQ
1.How can I place an order for BZX8450-C51-QVL through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C51-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-C51-QVL reliable?
The price and inventory of BZX8450-C51-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-C51-QVL is usually 5 days.
3.What payment methods are accepted for BZX8450-C51-QVL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C51-QVL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C51-QVL?
BZX8450-C51-QVL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C51-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-C51-QVL?
For technical support, including BZX8450-C51-QVL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C51-QVL requirements.
6.How does Aetrix verify that BZX8450-C51-QVL is sourced from the original manufacturer or authorized distributors?
All BZX8450-C51-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-C51-QVL meets industry standards.
7.What is the process for return or replacement of BZX8450-C51-QVL?
All BZX8450-C51-QVL units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C51-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-C51-QVL part is unused and in its original packaging.
Return procedure for BZX8450-C51-QVL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-C51-QVL 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
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
