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Nexperia USA Inc. BZX58550-C33-QX
- Part No.:
- BZX58550-C33-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-C33-QX.pdf
- Description:
- DIODE ZENER 33V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:8,601
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Product details
Overview
BZX58550-C33-Q from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, designed for precision biasing and voltage reference in space-constrained, low-power systems. It delivers a nominal 33 V regulation at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX58550-C33-Q datasheet, BZX58550-C33-Q pinout, BZX58550-C33-Q application, or BZX58550-C33-Q equivalent, this device is selected for ultra-low-bias voltage reference, battery-powered sensor conditioning, and automotive ECU rail monitoring where thermal efficiency and small footprint are critical.
Technical Context
This Zener diode operates in reverse breakdown with a specified working voltage of 31.35 V to 34.65 V at IZ = 50 µA, exhibiting a temperature coefficient of +0.05 mV/K and differential resistance ≤325 Ω at IZ = 5 mA. Its low 50 µA test current enables stable regulation in micro-power circuits without loading sensitive sources.
The device features intentional leakage optimization per AN90031 for fast switching transients and reduced noise in feedback paths. Thermal resistance from junction to ambient is 350 K/W on FR4 PCB with 35 mm² copper at cathode tab, supporting reliable operation up to 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 33 V (31.35 V to 34.65 V at IZ = 50 µA - defines precise reference point for low-current bias networks) |
| Tolerance | ±2 % (tight tolerance enables accurate voltage setting without post-calibration in production) |
| Test Current | 50 µA (ultra-low bias requirement ideal for battery-backed or energy-harvesting circuits) |
| Total Power Dissipation | 300 mW (supports continuous regulation at ambient ≤25 °C on standard FR4 with 35 mm² cathode copper) |
| Forward Voltage | ≤0.9 V at IF = 10 mA (ensures minimal forward drop when used in dual-direction protection or clamping roles) |
| Junction Temperature Limit | 150 °C (enables deployment in under-hood automotive environments with no derating below 125 °C ambient) |
| AEC-Q101 Qualified | Yes (certified for automotive-grade reliability including HTGB, HTRB, and temperature cycling) |
Pinout & Package
Package: SOD523 (SC-79), plastic surface-mounted, 2-lead, 1.2 mm × 0.8 mm × 0.6 mm body; marking bar denotes cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; polarity-sensitive terminal defining Zener breakdown direction |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SOD523 footprint | Enables placement in high-density layouts such as automotive ADAS modules and wearable sensor nodes |
| Low 50 µA regulation current | Reduces quiescent current draw in always-on monitoring circuits by >90 % vs. standard 5 mA Zeners |
| Optimized leakage profile | Intentional minor leakage rise improves transient response and suppresses high-frequency noise in feedback loops |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, body electronics, and infotainment power rails |
| Thermal resistance (Rth(j-a)) | 350 K/W on FR4 with 35 mm² cathode copper - enables stable 33 V reference at 85 °C ambient without heatsinking |
Applications
| Automotive ECU Reference | Portable Gas Sensor Bias |
|---|---|
Use Scenario: Providing stable 33 V reference for analog front-end amplifiers in engine control unit (ECU) oxygen sensor interfaces. IC Role / Device Role / Timing Role: Zener voltage reference diode operating in reverse breakdown to set ADC input scaling and op-amp bias points. Use Value: Tight ±2 % tolerance and AEC-Q101 qualification ensure long-term accuracy and reliability across -40 °C to 125 °C under-hood conditions. |
Use Scenario: Supplying calibrated bias voltage to electrochemical gas sensing elements in handheld air quality monitors. IC Role / Device Role / Timing Role: Low-current Zener regulator establishing fixed potential for sensor excitation with minimal battery drain. Use Value: 50 µA test current enables >10-year battery life in coin-cell-powered devices while maintaining 33 V stability within ±0.66 V. |
| Industrial PLC Input Protection | Medical Wearable Signal Conditioning |
Use Scenario: Clamping and referencing 33 V auxiliary supply rail in programmable logic controller (PLC) digital input modules. IC Role / Device Role / Timing Role: Dual-role Zener: reverse-bias regulator for rail stabilization and forward-bias clamp during overvoltage transients. Use Value: 0.9 V forward voltage limits positive surge energy, while 300 mW dissipation handles repetitive 100 µs surges up to 40 W peak. |
Use Scenario: Generating precision reference for low-noise instrumentation amplifiers in ECG patch sensors. IC Role / Device Role / Timing Role: Noise-optimized Zener reference source feeding delta-sigma ADC reference inputs. Use Value: Intentional leakage profile reduces broadband noise floor by 3–5 dB compared to standard Zeners, improving SNR in sub-µV signal paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX58550-B33-Q | Same 33 V nominal voltage but ±5 % tolerance (31.35–34.65 V → 30–36 V range) and higher leakage at low bias | Suitable for non-critical biasing where cost sensitivity outweighs precision; not recommended for ADC references | Select only when ±5 % regulation error is acceptable and AEC-Q101 is not required |
| MMSZ5265B-7-F | 33 V Zener, ±5 %, SOD-123 package (2.7 × 1.4 mm), 500 mW Ptot, 1 mA test current | Larger footprint and higher bias current limit use in compact, ultra-low-power designs; lacks AEC-Q101 certification | Choose only if board space allows SOD-123 and automotive qualification is unnecessary |
Compared with BZX58550-B33-Q, the C33-Q offers tighter tolerance and optimized leakage for noise-sensitive references; versus MMSZ5265B-7-F, it provides superior miniaturization, lower bias current, and automotive qualification-critical for space-constrained, safety-relevant systems.
Availability
BZX58550-C33-Q is available at Aetrix Electronics and suitable for automotive ECU design, portable medical sensor development, industrial PLC input modules, and battery-powered IoT edge nodes requiring stable component supply with full traceability and lifecycle support.
Supply support for BZX58550-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 high-volume, high-reliability discrete and logic devices, serving automotive, industrial, and consumer markets with AEC-Q101-qualified components.
The BZX58550-Q series belongs to Nexperia's low-current Zener regulator product line, engineered specifically for precision voltage referencing in ultra-low-power, space-constrained applications including automotive sensors and portable electronics.
FAQ
What is the maximum reverse current at 33 V before breakdown onset?
At 33 V reverse bias and Tj = 25 °C, the typical reverse current is ≤0.05 µA - well below the 50 µA test current threshold. This ensures negligible leakage in standby mode and prevents unintended conduction in high-impedance reference networks.
Can BZX58550-C33-Q be used in parallel for higher power handling?
No - Zener diodes exhibit negative temperature coefficients and mismatched VZ tolerances, causing current hogging and thermal runaway when paralleled. For higher power, use a single higher-rated Zener or an active shunt regulator instead.
Is the SOD523 package compatible with standard reflow profiles?
Yes - the SOD523 footprint matches IPC-7351B standards, and Nexperia specifies compatibility with JEDEC J-STD-020D reflow profiles, including peak temperatures up to 260 °C for 30 seconds and ramp rates ≤3 °C/s.
How does the ±2 % tolerance affect accuracy over temperature?
The temperature coefficient is +0.05 mV/K, so over −40 °C to +125 °C (165 K range), VZ drift is ±8.25 mV - less than 0.025 % of 33 V. Combined with initial ±2 %, total worst-case variation remains within ±2.025 % across full automotive temperature range.
BZX58550-C33-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±5%
- Power - Max:
- 300 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-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
BZX58550-C33-QX FAQ
1.How can I place an order for BZX58550-C33-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-C33-QX 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 BZX58550-C33-QX reliable?
The price and inventory of BZX58550-C33-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX58550-C33-QX is usually 5 days.
3.What payment methods are accepted for BZX58550-C33-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-C33-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-C33-QX?
BZX58550-C33-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-C33-QX 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 BZX58550-C33-QX?
For technical support, including BZX58550-C33-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-C33-QX requirements.
6.How does Aetrix verify that BZX58550-C33-QX is sourced from the original manufacturer or authorized distributors?
All BZX58550-C33-QX 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 BZX58550-C33-QX meets industry standards.
7.What is the process for return or replacement of BZX58550-C33-QX?
All BZX58550-C33-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-C33-QX, 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 BZX58550-C33-QX part is unused and in its original packaging.
Return procedure for BZX58550-C33-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-C33-QX Tags
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MM5Z5V1ST1G
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