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Nexperia USA Inc. BZX8450-C33VL
- Part No.:
- BZX8450-C33VL
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C33VL.pdf
- Description:
- DIODE ZENER 33V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,090
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Product details
Overview
BZX8450-C33VL from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision voltage reference and clamping in battery-powered systems. It delivers a nominal 33 V regulation at 50 µA test current, with ±5 % tolerance, 250 mW total power dissipation, and 325 Ω differential resistance at 5 mA, enabling stable biasing in portable sensor interfaces and low-power microcontroller reset circuits.
For engineers reviewing the BZX8450-C33VL datasheet, BZX8450-C33VL pinout, BZX8450-C33VL application, or BZX8450-C33VL equivalent, this page provides verified electrical parameters, thermal behavior, SOT23 terminal mapping, and validated alternative parts for low-current voltage regulation design-in.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 31.35 V to 34.65 V at IZ = 50 µA. Its temperature coefficient is +0.05 mV/K, indicating near-zero drift over ambient range, and it exhibits 45 pF junction capacitance at 0 V reverse bias - critical for noise-sensitive analog front-ends.
The device features intentional leakage optimization per AN90031 for fast switching transients and reduced high-frequency noise. With Rth(j-a) = 500 K/W and Rth(j-sp) = 330 K/W, thermal performance is defined for FR4 PCB mounting with single-sided 70 µm copper and standard SOT23 footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 33 V (31.35–34.65 V at 50 µA; enables precise 3.3 V rail derivation via resistor divider) |
| Tolerance | ±5 % (C-grade series; supports cost-optimized designs where tight regulation is not required) |
| Differential Resistance | 325 Ω at 5 mA (low impedance improves regulation stability under varying load current) |
| Power Dissipation | 250 mW at Tamb ≤ 25 °C (limits maximum continuous current to ~7.6 mA at 33 V) |
| Forward Voltage | 0.9 V at 10 mA (ensures predictable turn-on behavior in dual-direction protection schemes) |
| Junction Capacitance | 45 pF at 0 V, 1 MHz (low enough to avoid signal integrity degradation in <10 MHz analog paths) |
| Reverse Leakage | 0.05 µA at VR = 25.4 V (supports ultra-low quiescent current in always-on monitoring nodes) |
Pinout & Package
SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch, 3-terminal configuration with cathode tab solder point.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential node; reverse-biased during regulation; must be routed with minimal trace inductance for transient suppression |
| 2 | Not Connected (n.c.) | Internally unconnected; no PCB pad required; must remain floating to prevent parasitic coupling |
| 3 | Cathode (K) | High-side connection point; carries full Zener current; thermal path to PCB copper enhances power handling |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - reduces standby power in battery-critical applications like IoT endpoint sensors |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - improves transient response and suppresses high-frequency noise in LDO feedback paths |
| Thermal resistance control | Rth(j-sp) = 330 K/W to cathode solder point - enables reliable 250 mW operation on standard FR4 without thermal vias |
| Stable temperature coefficient | +0.05 mV/K - minimizes output drift across −55 °C to +150 °C ambient, supporting industrial-grade timing references |
Applications
| Portable Sensor Biasing | Microcontroller Reset Clamping |
|---|---|
|
Use Scenario: Providing stable reference voltage to analog sensor signal conditioning circuitry in coin-cell-powered environmental monitors. IC Role / Device Role / Timing Role: Zener voltage reference element establishing fixed bias point for op-amp input stages and ADC reference dividers. Use Value: 33 V rating allows direct use with 3.3 V LDOs via resistive scaling; ±5 % tolerance and 45 pF capacitance preserve SNR in sub-100 kSPS acquisition. |
Use Scenario: Clamping reset line voltage during brown-out conditions in ARM Cortex-M0+ based edge controllers. IC Role / Device Role / Timing Role: Reverse-biased Zener acting as overvoltage protector and threshold clamp on active-low reset pin. Use Value: 325 Ω dynamic impedance ensures rapid clamping response (<100 ns) to ESD transients while limiting peak current to safe MCU pin levels. |
| Low-Power RF Front-End Protection | Industrial Current Loop Reference |
|
Use Scenario: Protecting 2.4 GHz BLE transceiver RFIO pins from ESD and supply rail overshoot in handheld medical telemetry devices. IC Role / Device Role / Timing Role: Low-capacitance Zener shunt element placed directly at RF port, grounded via shortest possible path. Use Value: 45 pF capacitance avoids detuning of matching networks; 0.05 µA leakage prevents DC loading of sensitive bias tees. |
Use Scenario: Generating stable 33 V reference for 4–20 mA loop transmitter DAC output stage in factory automation modules. IC Role / Device Role / Timing Role: Precision voltage reference source feeding op-amp summing junction in current-output amplifier topology. Use Value: Near-zero TC (+0.05 mV/K) maintains loop accuracy across −40 °C to +85 °C cabinet environments without calibration drift. |
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 | Same 33 V nominal, ±5 %, but rated at 300 mW Ptot and higher rdiff (400 Ω); no intentional leakage optimization | Lacks AN90031 noise-reduction tuning; less suitable for high-speed analog sensing | Select when higher power margin is needed and noise sensitivity is low |
| MMSZ5257ET1G | 33 V, ±5 %, 500 mW Ptot, but 100 Ω rdiff; SOD-123 package; 30 pF Cj | Lower capacitance benefits RF apps, but larger footprint and higher leakage (1 µA @ 25.4 V) | Prefer for space-tolerant designs needing tighter regulation and faster response |
Compared with BZX8450-C33VL, BZX84-C33 offers higher power headroom but poorer noise performance, while MMSZ5257ET1G delivers lower impedance and capacitance at the cost of increased leakage and board area - making BZX8450-C33VL optimal for ultra-low-power, noise-critical SOT23-constrained designs.
Availability
BZX8450-C33VL is available at Aetrix Electronics and suitable for portable sensor biasing, microcontroller reset clamping, low-power RF front-end protection, and industrial current loop reference requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX8450-C33VL 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 core expertise in automotive-qualified and industrial-grade components.
The BZX8450 series belongs to Nexperia's low-current Zener regulator portfolio, engineered specifically for battery-powered and space-constrained applications demanding minimal test current, optimized leakage behavior, and robust thermal performance in SOT23.
FAQ
What is the maximum continuous reverse current for BZX8450-C33VL at 25 °C ambient?
The device supports up to 7.6 mA continuous reverse current at 33 V to stay within its 250 mW power limit (P = V × I). Derating is required above 25 °C ambient per Rth(j-a) = 500 K/W; at 70 °C, max current drops to ~4.5 mA to maintain Tj ≤ 150 °C.
Does BZX8450-C33VL have a specified Zener impedance at 1 mA?
Yes - differential resistance is 325 Ω at IZ = 5 mA, and typical rdiff is 350 Ω at IZ = 1 mA per Table 8. This value reflects dynamic impedance under small-signal AC conditions and directly impacts regulation error under load variation.
Can BZX8450-C33VL be used in forward conduction mode?
Yes - it functions as a standard silicon diode with VF ≤ 0.9 V at 10 mA. However, its primary design intent is reverse-bias regulation; forward conduction is only specified for characterization and should not be relied upon for rectification or switching in production circuits.
Is the "VL" suffix in BZX8450-C33VL a manufacturer-specific marking code?
Yes - "VL" corresponds to the marking code "JT%" per Table 4, where "%" is a placeholder for manufacturing site code. This matches the BZX8450-C33 variant and confirms the device is part of the C-tolerance (±5 %) series with optimized leakage characteristics.
BZX8450-C33VL 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX8450-C33VL FAQ
1.How can I place an order for BZX8450-C33VL through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C33VL 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-C33VL reliable?
The price and inventory of BZX8450-C33VL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-C33VL is usually 5 days.
3.What payment methods are accepted for BZX8450-C33VL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C33VL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C33VL?
BZX8450-C33VL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C33VL 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-C33VL?
For technical support, including BZX8450-C33VL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C33VL requirements.
6.How does Aetrix verify that BZX8450-C33VL is sourced from the original manufacturer or authorized distributors?
All BZX8450-C33VL 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-C33VL meets industry standards.
7.What is the process for return or replacement of BZX8450-C33VL?
All BZX8450-C33VL units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C33VL, 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-C33VL part is unused and in its original packaging.
Return procedure for BZX8450-C33VL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-C33VL 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
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