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Nexperia USA Inc. BZX58550-B9V1X
- Part No.:
- BZX58550-B9V1X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B9V1X.pdf
- Description:
- DIODE ZENER 9.1V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:6,504
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Product details
Overview
BZX58550-B9V1X from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, providing 9.1 V nominal regulation at 50 µA test current, with ±2 % tolerance, 100 Ω differential resistance at 5 mA, and 300 mW total power dissipation - optimized for battery-powered sensor nodes and low-bias reference circuits.
For engineers reviewing the BZX58550-B9V1X datasheet, BZX58550-B9V1X pinout, BZX58550-B9V1X application, or BZX58550-B9V1X equivalent, this page delivers verified electrical characteristics, thermal behavior under PCB copper area constraints, cathode/anode terminal mapping, and validated alternative Zeners for portable and space-constrained designs.
Technical Context
This device operates as a two-terminal shunt voltage reference, maintaining stable 9.1 V output across load variations by conducting reverse current above its breakdown threshold. Its specified test current of 50 µA enables ultra-low quiescent operation in energy-sensitive systems.
It exhibits a positive temperature coefficient of +3.8 mV/K and 150 pF junction capacitance at 0 V, making it suitable for DC biasing rather than high-frequency noise suppression. The intentional minor leakage rise (per AN90031) supports fast switching transients without compromising regulation accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 9.1 V at IZ = 50 µA - defines precise DC reference point for low-power analog circuitry |
| Tolerance | ±2 % - ensures tight voltage accuracy without post-production trimming |
| Differential Resistance | 100 Ω at IZ = 5 mA - determines regulation stiffness against load current changes |
| Forward Voltage | 0.9 V at IF = 10 mA - limits forward conduction loss in bidirectional protection configurations |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C on FR4 with 35 mm² cathode copper - sets maximum continuous thermal budget |
| Junction Temperature Limit | 150 °C - constrains maximum operating ambient when derated per Rth(j-a) = 350 K/W |
| Reverse Current | 0.1 µA at VR = 6.9 V - confirms low leakage below regulation knee, critical for standby power integrity |
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 on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated voltage node; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased during regulation operation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables use in microamp-level bias networks without loading error |
| Ultra-compact footprint | SOD523 package - saves >60 % board area vs. SOD323, critical for wearables and IoT sensors |
| Controlled leakage profile | Intentional minor IR rise per AN90031 - improves transient response while retaining DC accuracy |
| Thermal performance | Rth(j-a) = 350 K/W with 35 mm² cathode copper - allows 270 mW continuous dissipation at 25 °C ambient |
Applications
| Portable Sensor Biasing | Low-Power ADC Reference |
|---|---|
Use Scenario: Providing stable excitation voltage to MEMS pressure sensors in battery-operated environmental monitors. IC Role / Device Role / Timing Role: Shunt voltage reference regulating sensor bridge supply at 9.1 V with sub-1 µA standby draw. Use Value: Enables 10-year coin-cell life by limiting bias current to 50 µA while holding <0.2 % drift over −40 °C to +85 °C. |
Use Scenario: Supplying precision reference to 12-bit SAR ADCs in handheld medical diagnostic tools. IC Role / Device Role / Timing Role: Low-noise DC reference source replacing larger TL431-based solutions. Use Value: Delivers 9.1 V ±0.18 V accuracy without external capacitors, reducing BOM count and layout complexity. |
| IoT Node Voltage Clamp | EEPROM Write Protection |
Use Scenario: Clamping I²C bus voltage during hot-plug events in smart home hubs. IC Role / Device Role / Timing Role: Transient-overvoltage suppressor leveraging Zener knee behavior at 9.1 V. Use Value: Limits bus overshoot to safe levels with <10 ns response, avoiding false writes or latch-up in connected peripherals. |
Use Scenario: Preventing accidental EEPROM write cycles during brown-out conditions in industrial controllers. IC Role / Device Role / Timing Role: Undervoltage lockout element triggering reset when supply drops below 9.1 V threshold. Use Value: Guarantees data integrity by disabling write logic before VCC falls below minimum programming voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-current Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX58550-C9V1 | ±5 % tolerance, higher leakage (0.1 µA vs. 0.1 µA), identical VZ min/max range | Acceptable where cost sensitivity outweighs voltage accuracy requirements | Select for non-critical bias rails where ±5 % regulation suffices and BOM cost reduction is prioritized |
| MMSZ5240B | Same 9.1 V nominal, ±5 % tolerance, SOD-123 package (2.7 mm × 1.4 mm), 500 mW Ptot | Higher power handling but 3× larger footprint; less suitable for ultra-dense layouts | Choose when thermal margin >300 mW is required and board space permits larger package |
Compared with BZX58550-C9V1, the BZX58550-B9V1X offers tighter tolerance for precision references; compared with MMSZ5240B, it sacrifices power headroom for 65 % smaller area - making it optimal for miniaturized, battery-limited systems where voltage accuracy and size dominate.
Availability
BZX58550-B9V1X is available at Aetrix Electronics and suitable for portable sensor biasing, low-power ADC referencing, IoT node voltage clamping, and EEPROM write protection requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX58550-B9V1X 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, logic, and MOSFET solutions for automotive, industrial, and consumer markets.
The BZX58550 series belongs to Nexperia's low-current Zener regulator portfolio, engineered specifically for space-constrained, battery-powered applications demanding minimal test current and ultra-small packaging without sacrificing voltage accuracy.
FAQ
What is the maximum continuous reverse current the BZX58550-B9V1X can sustain at 25 °C ambient?
The device sustains up to 33 mA continuous reverse current at 25 °C ambient when mounted on an FR4 PCB with 35 mm² cathode copper area, derived from its 300 mW power rating and 9.1 V nominal Zener voltage (IZ(max) = 300 mW / 9.1 V ≈ 33 mA). Derating applies above 25 °C per Rth(j-a) = 350 K/W.
Does the BZX58550-B9V1X require an external series resistor in standard regulation use?
Yes - a series current-limiting resistor is mandatory to set the operating Zener current between 50 µA and 33 mA. For example, with a 12 V supply and target 5 mA Zener current, a 580 Ω resistor (R = (12 V − 9.1 V) / 5 mA) ensures stable regulation while staying within power and thermal limits.
How does the BZX58550-B9V1X behave under transient overvoltage conditions?
It clamps voltages above ~9.1 V by entering controlled reverse conduction, with non-repetitive peak reverse power dissipation rated at 40 W for 100 µs pulses. Its 150 pF junction capacitance minimizes high-frequency coupling, making it effective for slow-to-moderate transients like ESD-induced surges on low-speed signal lines.
Can the BZX58550-B9V1X be used in place of a 9.1 V TL431 shunt regulator?
No - the BZX58550-B9V1X is a passive two-terminal Zener diode lacking the TL431's adjustable reference, active error amplifier, and sink-current capability. It provides fixed-voltage regulation only and cannot replicate TL431's programmability, precision feedback, or high-current sinking (up to 100 mA), though it replaces TL431 where simplicity and ultra-low quiescent current are paramount.
BZX58550-B9V1X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX58550
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 9.1 V
- Tolerance:
- ±2%
- Power - Max:
- 270 mW
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 6.9 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-B9V1X FAQ
1.How can I place an order for BZX58550-B9V1X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B9V1X 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-B9V1X reliable?
The price and inventory of BZX58550-B9V1X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX58550-B9V1X is usually 5 days.
3.What payment methods are accepted for BZX58550-B9V1X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B9V1X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B9V1X?
BZX58550-B9V1X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B9V1X 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-B9V1X?
For technical support, including BZX58550-B9V1X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B9V1X requirements.
6.How does Aetrix verify that BZX58550-B9V1X is sourced from the original manufacturer or authorized distributors?
All BZX58550-B9V1X 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-B9V1X meets industry standards.
7.What is the process for return or replacement of BZX58550-B9V1X?
All BZX58550-B9V1X units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B9V1X, 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-B9V1X part is unused and in its original packaging.
Return procedure for BZX58550-B9V1X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B9V1X Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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SMAZ12-13-F
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