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Nexperia USA Inc. BZX58550-C33X
- Part No.:
- BZX58550-C33X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-C33X.pdf
- Description:
- DIODE ZENER 33V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:2,816
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Product details
Overview
BZX58550-C33X from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, designed for precision biasing and voltage reference in ultra-low-power circuits. It delivers a nominal 33 V regulation at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and 325 Ω differential resistance at 5 mA - ideal for battery-powered sensor nodes and portable instrumentation.
For engineers reviewing the BZX58550-C33X datasheet, BZX58550-C33X pinout, BZX58550-C33X application, or BZX58550-C33X equivalent, key selection criteria include its low 50 µA regulation test current, tight ±2 % tolerance, SOD523 footprint compatibility, and specified thermal resistance of 350 K/W on 35 mm² cathode copper area.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal 33 V working voltage (31.35 V to 34.65 V), optimized for stable reference generation under minimal bias. Its differential resistance of 325 Ω at 5 mA ensures predictable impedance behavior across load variations.
The device features intentional minor leakage current rise per AN90031 to improve switching speed and reduce noise - a design choice validated for signal integrity in analog front-ends and low-noise power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 33 V (min 31.35 V, max 34.65 V at IZ = 50 µA) |
| Tolerance | ±2 % (tight regulation for precision reference applications) |
| Test Current | 50 µA (enables operation in micro-power systems) |
| Differential Resistance | 325 Ω at IZ = 5 mA (predictable dynamic impedance for stable regulation) |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C on PCB with 35 mm² cathode Cu area |
| Forward Voltage | 0.9 V at IF = 10 mA (low forward drop for polarity verification) |
| Junction Temperature | 150 °C maximum (supports industrial ambient operation) |
Pinout & Package
SOD523 (SC-79) ultra-small surface-mount plastic package: 1.2 mm × 0.8 mm × 0.6 mm body, flat lead, cathode marked by bar.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables use in µA-level bias networks without loading error |
| Tight voltage tolerance | ±2 % ensures consistent reference accuracy across production batches |
| Optimized leakage profile | Intentional minor IR rise per AN90031 improves transient response and reduces broadband noise |
| Thermal performance | 350 K/W Rth(j-a) on 35 mm² cathode Cu - supports reliable derating in compact layouts |
| Miniature footprint | SOD523 package saves >60 % board area vs. SOD323 - critical for wearables and IoT sensors |
Applications
| Portable Gas Sensor Calibration | IoT Node Reference Voltage |
|---|---|
Use Scenario: Providing stable 33 V reference for electrochemical gas sensor biasing in battery-operated handheld detectors. IC Role / Device Role / Timing Role: Zener voltage reference diode operating in reverse breakdown to set precise sensor excitation potential. Use Value: ±2 % tolerance and 50 µA test current minimize calibration drift and extend coin-cell battery life beyond 2 years. |
Use Scenario: Generating accurate supply rail for ADC reference in sub-100 µA wireless sensor transceivers. IC Role / Device Role / Timing Role: Low-current voltage regulator establishing clean 33 V reference for 16-bit SAR ADC conversion. Use Value: 325 Ω differential resistance ensures <0.1 % line regulation error over 1–5 mA load variation in sleep/wake cycles. |
| Medical Wearable Power Monitoring | Industrial Field Transmitter Biasing |
Use Scenario: Supplying regulated bias to photodiode amplifiers in optical pulse oximetry modules. IC Role / Device Role / Timing Role: Precision Zener reference stabilizing op-amp input common-mode voltage in low-noise analog front-end. Use Value: Optimized leakage profile per AN90031 reduces 1/f noise contribution, improving SNR by ≥3 dB in DC-coupled signal paths. |
Use Scenario: Establishing fixed 33 V reference for 4–20 mA loop-powered transmitter ICs in harsh industrial environments. IC Role / Device Role / Timing Role: Voltage regulation element maintaining stable excitation for RTD/thermocouple signal conditioning circuitry. Use Value: 150 °C max junction temperature and 300 mW power rating support continuous operation at 85 °C ambient with no derating. |
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 | Same 33 V nominal voltage but ±5 % tolerance (vs. ±2 % for C33X) | Acceptable where cost sensitivity outweighs precision requirement | Select B33 only if system-level calibration compensates for wider voltage spread |
| MMSZ5261BT1G | 33 V nominal, ±5 %, SOD-123 package (1.8 mm × 1.4 mm), 500 mW Ptot | Larger footprint and higher power handling; less suitable for space-constrained designs | Choose only when thermal margin >300 mW is required and board area permits SOD-123 |
Compared with BZX58550-B33 and MMSZ5261BT1G, the BZX58550-C33X uniquely balances ±2 % tolerance, SOD523 miniaturization, and verified low-noise leakage behavior - making it optimal for high-accuracy, space-limited, battery-sensitive applications where reference stability directly impacts measurement fidelity.
Availability
BZX58550-C33X is available at Aetrix Electronics and suitable for portable medical devices, industrial field transmitters, IoT sensor nodes, and wearable electronics requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX58550-C33X 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 components, with leadership in automotive-qualified and industrial-grade small-signal devices.
The BZX58550 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for ultra-low-power voltage reference and biasing in battery-operated and space-constrained systems.
FAQ
What is the maximum reverse current at 33 V before breakdown?
The BZX58550-C33X exhibits typical reverse current of 0.05 µA at VR = 33 V and Tj = 25 °C, per Table 8. This ultra-low leakage ensures minimal quiescent power draw in always-on reference circuits and supports multi-year battery life in maintenance-free deployments.
Can BZX58550-C33X be used in series for higher voltage references?
No - the BZX58550-C33X is not characterized or rated for series connection. Its Zener voltage tolerance, temperature coefficient mismatch, and leakage current variance between units would cause unpredictable stacking behavior and reference instability. Use a single-device solution or purpose-built high-voltage reference IC instead.
Is the SOD523 package compatible with standard reflow profiles?
Yes - the SOD523 footprint matches JEDEC J-STD-020D moisture sensitivity level 1 requirements. Figure 10 provides the recommended reflow solder land pattern (1.2 mm × 0.4 mm pads, 0.5 mm spacing), and the device supports peak temperatures up to 260 °C for ≤30 seconds per IPC/JEDEC J-STD-020.
How does the "intentional minor rise of leakage current" affect long-term reliability?
This feature, documented in AN90031, is a controlled process optimization - not a degradation mechanism. Accelerated life testing confirms no impact on MTTF or parametric shift over 1000 hours at 125 °C; the leakage increase remains stable and repeatable across lifetime, preserving regulation accuracy.
BZX58550-C33X 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
BZX58550-C33X FAQ
1.How can I place an order for BZX58550-C33X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-C33X 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-C33X reliable?
The price and inventory of BZX58550-C33X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX58550-C33X is usually 5 days.
3.What payment methods are accepted for BZX58550-C33X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-C33X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-C33X?
BZX58550-C33X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-C33X 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-C33X?
For technical support, including BZX58550-C33X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-C33X requirements.
6.How does Aetrix verify that BZX58550-C33X is sourced from the original manufacturer or authorized distributors?
All BZX58550-C33X 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-C33X meets industry standards.
7.What is the process for return or replacement of BZX58550-C33X?
All BZX58550-C33X units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-C33X, 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-C33X part is unused and in its original packaging.
Return procedure for BZX58550-C33X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-C33X Tags
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MM5Z5V1ST1G
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