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Nexperia USA Inc. BZX58550-B33-QX
- Part No.:
- BZX58550-B33-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B33-QX.pdf
- Description:
- DIODE ZENER 33V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:8,635
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Product details
Overview
BZX58550-B33-QX from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, providing 33 V nominal 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-B33-QX datasheet, BZX58550-B33-QX pinout, BZX58550-B33-QX application, or BZX58550-B33-QX equivalent, this device serves as a precision low-bias voltage reference in battery-powered sensor nodes, automotive body electronics, and portable instrumentation where space, leakage, and thermal constraints are critical.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 32.3 V to 33.7 V at IZ = 50 µA, exhibiting a differential resistance ≤325 Ω at IZ = 5 mA and a temperature coefficient of +0.05 mV/K - indicating near-zero thermal drift in its operating range.
Its ultra-small SOD523 package delivers minimal PCB footprint (1.2 mm × 0.8 mm) and low thermal resistance (Rth(j-a) = 350 K/W with 35 mm² cathode copper), enabling stable regulation in thermally constrained automotive and portable designs without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 33 V (min 32.3 V, max 33.7 V at IZ = 50 µA - defines precise regulation point for low-power bias networks) |
| Tolerance | ±2 % (tight tolerance enables accurate voltage referencing without post-calibration in safety-critical automotive modules) |
| Power Dissipation | 300 mW (max at Tamb ≤ 25 °C on FR4 with 35 mm² cathode Cu - supports continuous operation in compact automotive ECUs) |
| Test Current | 50 µA (ultra-low regulation current ideal for battery-backed real-time clocks and low-leakage microcontroller reset circuits) |
| Differential Resistance | ≤325 Ω at IZ = 5 mA (low dynamic impedance ensures stable output under small-signal load variations in sensor signal conditioning) |
| Reverse Leakage | ≤0.05 µA at VR = 25 V (minimal standby current preserves battery life in always-on vehicle subsystems) |
| Thermal Resistance | 350 K/W (junction-to-ambient with 35 mm² cathode copper - enables reliable operation up to +125 °C ambient in engine bay proximity) |
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 requiring correct PCB silkscreen alignment and trace routing |
| 2 | Anode (A) | Connected to ground or lower-potential rail; forms reverse-biased junction enabling Zener conduction at 33 V |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including body control modules and infotainment power rails per stress-test requirements |
| Ultra-low test current | 50 µA regulation point enables direct use in micropower systems without additional biasing circuitry |
| Optimized leakage profile | Intentional minor rise in leakage improves switching speed and reduces noise in feedback paths of LDOs and ADC references |
| Small-outline package | SOD523 footprint saves >60 % board area vs. SOD323, supporting high-density layout in ADAS camera modules and radar sensors |
| Stable temperature coefficient | +0.05 mV/K ensures <±0.5 % voltage shift over −40 °C to +125 °C - critical for engine control unit reference stability |
Applications
| Automotive Body Control Unit | Portable Medical Sensor Node |
|---|---|
Use Scenario: Voltage reference for LIN bus transceiver bias and interior lighting PWM dimming ICs in door modules. IC Role / Device Role / Timing Role: Zener regulator supplying stable 33 V to analog front-end comparators and gate drivers. Use Value: ±2 % tolerance and AEC-Q101 qualification ensure functional safety compliance and long-term calibration retention across vehicle lifetime. |
Use Scenario: Reference source for 16-bit SAR ADC measuring ECG electrode offset in wearable patch monitors. IC Role / Device Role / Timing Role: Low-leakage voltage clamp establishing precise 33 V rail for ADC reference buffer stage. Use Value: 50 µA test current and <0.05 µA leakage at 25 V extend single-cell coin battery life beyond 18 months. |
| Industrial IoT Gateway Power Monitor | Automotive Camera Module Bias Supply |
Use Scenario: Regulation of auxiliary 33 V rail feeding isolated current-sense amplifiers monitoring 48 V battery systems. IC Role / Device Role / Timing Role: Precision shunt regulator stabilizing sensing node supply independent of main DC-DC converter ripple. Use Value: 325 Ω differential resistance suppresses measurement error caused by load-induced voltage sag during transient events. |
Use Scenario: Bias supply for CMOS image sensor analog core and lens actuator driver in rear-view cameras. IC Role / Device Role / Timing Role: Compact Zener providing clean 33 V reference for sensor PLL clock generation and analog gain stages. Use Value: SOD523 package and 350 K/W thermal resistance allow operation at 105 °C ambient without derating in sealed camera housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX58550-C33-Q | ±5 % tolerance (vs. ±2 %), identical 33 V nominal, same SOD523 package and AEC-Q101 qualification | Acceptable where cost sensitivity outweighs tight regulation needs, e.g., non-safety-critical LED backlighting | Select when budget constraints dominate and ±5 % output variation is acceptable in system-level tolerance stack-up |
| MMSZ5257B-7-F | 33 V nominal, ±5 % tolerance, SOD-123 package (2.7 mm × 1.6 mm), 500 mW Ptot, no AEC-Q101 rating | Suitable for industrial/commercial boards but not automotive due to lack of automotive qualification and larger footprint | Choose only for non-automotive applications requiring higher power margin and where board space permits larger package |
Compared with BZX58550-C33-Q, the BZX58550-B33-QX offers tighter regulation for safety-critical functions; versus MMSZ5257B-7-F, it provides automotive qualification and 45 % smaller footprint at the cost of 300 mW vs. 500 mW power handling - prioritizing space and reliability over raw dissipation.
Availability
BZX58550-B33-QX is available at Aetrix Electronics and suitable for automotive body electronics, portable medical devices, industrial power monitoring, and camera module biasing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX58550-B33-QX 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, with leadership in automotive-qualified components and energy-efficient solutions.
The BZX58550-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for low-current, space-constrained automotive and portable applications demanding precision regulation and robust thermal performance.
FAQ
What is the maximum reverse voltage before breakdown for BZX58550-B33-QX?
The device exhibits a nominal Zener voltage of 33 V with guaranteed minimum and maximum values of 32.3 V and 33.7 V respectively at IZ = 50 µA. Breakdown occurs within this band; operation above 33.7 V risks exceeding absolute maximum ratings and must be avoided per Table 5 limiting values.
Can BZX58550-B33-QX replace a 33 V Zener in an existing SOD-323 design?
No - BZX58550-B33-QX uses SOD523 (SC-79) package (1.2 mm × 0.8 mm), while SOD-323 measures 1.7 mm × 1.3 mm. Footprint, solder pad geometry, and thermal land requirements differ significantly; mechanical redesign and requalification are required for migration.
Is the 50 µA test current the recommended operating current?
Yes - the 50 µA test current defines the specified Zener voltage and is optimized for low-power applications. Operating at higher currents (e.g., 5 mA) improves dynamic regulation but increases power dissipation and thermal load; design must verify Ptot limits and thermal resistance conditions.
Does the "QX" suffix indicate a specific revision or packaging variant?
The "QX" suffix denotes Nexperia's tape-and-reel packaging variant compliant with EIA-481-D standards, containing 10,000 units per reel, with moisture sensitivity level (MSL) 1 and lead-free (Pb-free) termination - confirmed in Nexperia's official ordering information documentation.
BZX58550-B33-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX58550-Q
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±2%
- Power - Max:
- 270 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-B33-QX FAQ
1.How can I place an order for BZX58550-B33-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B33-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-B33-QX reliable?
The price and inventory of BZX58550-B33-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-B33-QX is usually 5 days.
3.What payment methods are accepted for BZX58550-B33-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B33-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B33-QX?
BZX58550-B33-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B33-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-B33-QX?
For technical support, including BZX58550-B33-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B33-QX requirements.
6.How does Aetrix verify that BZX58550-B33-QX is sourced from the original manufacturer or authorized distributors?
All BZX58550-B33-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-B33-QX meets industry standards.
7.What is the process for return or replacement of BZX58550-B33-QX?
All BZX58550-B33-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B33-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-B33-QX part is unused and in its original packaging.
Return procedure for BZX58550-B33-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B33-QX 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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Diodes Incorporated
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onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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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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