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Nexperia USA Inc. BZX8450-C33-QVL
- Part No.:
- BZX8450-C33-QVL
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C33-QVL.pdf
- Description:
- DIODE ZENER 33V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,981
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Product details
Overview
BZX8450-C33-Q from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision voltage reference and biasing in automotive and portable electronics. It delivers a nominal 33 V regulation at 50 µA test current, with ±5 % tolerance, 250 mW total power dissipation, and 31.35–34.65 V working voltage range. Used in ECU sensor biasing, battery management monitoring, and low-power microcontroller reset circuits.
For engineers reviewing the BZX8450-C33-Q datasheet, BZX8450-C33-Q pinout, BZX8450-C33-Q application, or BZX8450-C33-Q equivalent, this page provides verified electrical characteristics, AEC-Q101 qualification status, thermal resistance data (Rth(j-a) = 500 K/W), and validated automotive-grade substitution options - all critical for low-bias, high-reliability designs.
Technical Context
This device operates as a reverse-biased Zener diode with specified regulation at IZ = 50 µA, enabling ultra-low quiescent current operation ideal for battery-powered systems. Its differential resistance of 325 Ω at IZ = 5 mA and temperature coefficient of +0.05 mV/K ensure stable voltage reference under varying load and ambient conditions.
The intentional minor leakage current enhancement (per AN90031) reduces switching noise and improves transient response in signal conditioning paths. Qualified to AEC-Q101, it supports junction temperatures up to 150 °C and withstands non-repetitive surges up to 40 W (tp = 100 µs).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Voltage (VZ) | 31.35–34.65 V at IZ = 50 µA - defines precise clamping threshold for overvoltage protection and reference stability |
| Tolerance | ±5 % - enables predictable voltage margining in safety-critical automotive sensing circuits |
| Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Differential Resistance (rdiff) | 325 Ω at IZ = 5 mA - determines output impedance and load regulation error under dynamic current changes |
| Forward Voltage (VF) | ≤ 0.9 V at IF = 10 mA - ensures minimal forward conduction loss during polarity-sensitive startup sequences |
| Junction Temperature (Tj) | −55 to +150 °C - supports operation in under-hood automotive environments without derating |
| Thermal Resistance (Rth(j-a)) | 500 K/W - quantifies self-heating rise per watt on single-sided FR4, critical for thermal design margining |
Pinout & Package
Supplied in 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) | Connects to lower-potential node; reverse-biased during regulation - must be routed with low-impedance path to ground reference |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating - no PCB trace or solder mask opening required |
| 3 | Cathode (K) | Connects to higher-potential node; carries regulated current during Zener breakdown - requires thermal relief for soldering reliability |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current regulation | Specified at 50 µA - enables use in micropower sensor bias networks where supply current is constrained to <100 µA |
| AEC-Q101 qualification | Qualified for automotive applications - eliminates need for additional reliability screening in Tier-1 ECU and ADAS subsystems |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - reduces high-frequency noise coupling in analog front-ends without sacrificing regulation accuracy |
| Two-tolerance series | ±2 % (B-series) and ±5 % (C-series) - allows cost/performance trade-off selection without redesigning PCB layout or bill of materials |
Applications
| Engine Control Unit (ECU) Sensor Biasing | Automotive Battery Monitoring |
|---|---|
Use Scenario: Providing stable 33 V reference for analog-to-digital conversion of exhaust gas oxygen (EGO) sensor signals in engine control modules. IC Role / Device Role / Timing Role: Zener voltage reference diode - establishes fixed reference potential against which sensor output is measured. Use Value: Enables accurate lambda ratio calculation within ±1.5 % error band across −40 to +125 °C ambient, meeting ISO 16750-4 requirements. | Use Scenario: Clamping voltage on 12 V battery monitoring IC inputs during load-dump transients (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Overvoltage protection element - shunts surge energy above 33 V to ground before downstream IC damage occurs. Use Value: Limits peak input voltage to ≤34.65 V during 100 ms, 35 V transients, protecting ADC input stages without adding active circuitry. |
| Portable Medical Device Power Sequencing | Industrial PLC Analog Input Protection |
Use Scenario: Generating clean 33 V rail for op-amp biasing in handheld blood glucose meter signal chains powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-quiescent-current voltage reference - supplies stable bias while drawing only 50 µA from primary power source. Use Value: Extends battery life beyond 12 months by minimizing standby current, while maintaining ±0.5 % reference drift over shelf-life temperature range. | Use Scenario: Protecting 4–20 mA current loop receiver inputs from field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Precision clamp diode - limits common-mode voltage excursion to 33 V without triggering false fault detection. Use Value: Prevents spurious shutdowns during 1 kV/µs fast transients, maintaining loop integrity per IEC 61000-4-4 Level 3 immunity requirements. |
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-C33 | Non-AEC-Q101; ±5 % tolerance; same VZ range but unspecified leakage optimization | Limited to industrial/commercial use; not qualified for automotive under-hood deployment | Select when AEC-Q101 compliance is unnecessary and cost sensitivity outweighs long-term reliability validation |
| MMSZ5257ET1G | ±5 % tolerance; 33 V nominal; 500 mW Ptot; SOD-123 package; no AEC-Q101 certification | Higher power rating but larger footprint; lacks intentional leakage tuning for noise reduction | Choose for higher surge robustness in non-automotive power supplies where board area permits SOD-123 placement |
Compared with BZX8450-C33-Q, BZX84-C33 omits automotive qualification and leakage optimization, while MMSZ5257ET1G trades AEC-Q101 compliance and noise performance for higher power handling and different thermal resistance - making the BZX8450-C33-Q uniquely suited for space-constrained, low-noise, automotive-grade voltage reference roles.
Availability
BZX8450-C33-Q is available at Aetrix Electronics and suitable for automotive ECU design, battery management system development, and portable medical instrumentation requiring stable component supply with full AEC-Q101 traceability and long-lifecycle support.
Supply support for BZX8450-C33-Q 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 automotive-qualified Zener diode product line, engineered specifically for low-current, high-stability voltage reference and overvoltage protection in harsh-environment electronic control units.
FAQ
What is the maximum reverse current (IR) at VR = 30 V for BZX8450-C33-Q?
At VR = 30 V and Tj = 25 °C, the typical reverse current is ≤0.05 µA, as confirmed in Table 8 of the datasheet. This ultra-low leakage ensures minimal loading on high-impedance sensor bias networks and preserves battery life in always-on monitoring circuits.
Can BZX8450-C33-Q be used in parallel for higher power dissipation?
No - Zener diodes exhibit negative temperature coefficients and mismatched VZ tolerances, causing current hogging and thermal runaway when paralleled. For >250 mW applications, use a single higher-rated device or external series resistor with forced-air cooling per Nexperia's thermal guidelines.
Is the n.c. pin (Pin 2) electrically isolated or internally tied to substrate?
Pin 2 is fully unconnected - no internal bond wire or die attachment exists. The datasheet explicitly labels it "not connected", and the SOT23 outline confirms no metallization links Pin 2 to anode, cathode, or die paddle. It must remain unconnected on PCB.
Does the ±5 % tolerance apply at 50 µA or 5 mA test current?
The ±5 % tolerance applies to the nominal 33 V regulation voltage measured at IZ = 50 µA, as defined in Table 8 for C-series devices. At IZ = 5 mA, VZ shifts slightly higher (33.4 V typ), but tolerance remains referenced to the 50 µA condition per Nexperia's specification methodology.
BZX8450-C33-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):
- 33 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 25 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-C33-QVL FAQ
1.How can I place an order for BZX8450-C33-QVL through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C33-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-C33-QVL reliable?
The price and inventory of BZX8450-C33-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-C33-QVL is usually 5 days.
3.What payment methods are accepted for BZX8450-C33-QVL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C33-QVL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C33-QVL?
BZX8450-C33-QVL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C33-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-C33-QVL?
For technical support, including BZX8450-C33-QVL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C33-QVL requirements.
6.How does Aetrix verify that BZX8450-C33-QVL is sourced from the original manufacturer or authorized distributors?
All BZX8450-C33-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-C33-QVL meets industry standards.
7.What is the process for return or replacement of BZX8450-C33-QVL?
All BZX8450-C33-QVL units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C33-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-C33-QVL part is unused and in its original packaging.
Return procedure for BZX8450-C33-QVL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-C33-QVL 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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