My Inquiry
My Account
Nexperia USA Inc. BZX58550-B43-QX
- Part No.:
- BZX58550-B43-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B43-QX.pdf
- Description:
- DIODE ZENER 43V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:6,751
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX58550-B43-QX 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 43 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-B43-QX datasheet, BZX58550-B43-QX pinout, BZX58550-B43-QX application, or BZX58550-B43-QX equivalent, key selection criteria include its ultra-low test current operation, tight voltage tolerance, thermal resistance of 350 K/W on standard PCB layout, and cathode-marked SOD523 footprint compatibility with high-density portable and automotive PCBs.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining stable reverse-bias voltage across its terminals under varying load conditions. Its specified regulation at IZ = 50 µA enables reliable performance in micro-power sensor biasing and standby circuitry where quiescent current must remain below 100 µA.
The BZX58550-B43-QX exhibits a positive temperature coefficient of +0.05 mV/K and differential resistance of 375 Ω at IZ = 0.5 mA, supporting predictable voltage drift compensation in temperature-sensitive analog front-ends. Its 40 pF capacitance at 0 V and 1 MHz ensures minimal signal coupling in high-frequency reference paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 43 V at IZ = 50 µA - defines precise reference point for low-current bias networks |
| Voltage Tolerance | ±2 % - ensures 42.14–43.86 V regulation window without post-production trimming |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C on FR4 PCB with 35 mm² cathode copper - supports continuous operation in compact automotive modules |
| Differential Resistance | 375 Ω at IZ = 0.5 mA - determines output impedance and load regulation error in feedback references |
| Reverse Current (IR) | ≤ 0.05 µA at VR = 34.4 V - guarantees negligible leakage in battery-backed keep-alive circuits |
| Forward Voltage | 0.9 V at IF = 10 mA - enables predictable anode-cathode drop during transient forward conduction |
| Thermal Resistance (j-a) | 350 K/W - defines junction-to-ambient rise per watt on standard PCB layout, critical for thermal margin analysis |
Pinout & Package
SOD523 (SC-79) plastic surface-mounted package: 2-pin, 1.2 mm × 0.8 mm × 0.6 mm body, 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 current-limiting resistor; forms shunt path to sink excess current during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low test current | Specified at 50 µA - enables stable regulation in micropower applications such as IoT sensor nodes and EEPROM backup circuits |
| AEC-Q101 qualification | Qualified for automotive-grade reliability - supports deployment in engine control units, body electronics, and ADAS subsystems without additional stress screening |
| Tight voltage tolerance | ±2 % tolerance band - eliminates need for external trimming in factory-calibrated voltage references for ADC/DAC biasing |
| Optimized leakage profile | Intentional minor leakage rise per AN90031 - reduces switching noise and improves transient response in fast-switching power monitor circuits |
| Miniature SOD523 footprint | 1.2 mm × 0.8 mm body - allows placement in high-density layouts including wearable medical devices and compact infotainment modules |
Applications
| Automotive Sensor Biasing | Portable Device Reference |
|---|---|
Use Scenario: Providing stable bias voltage to MEMS pressure sensors in engine manifold modules. IC Role / Device Role / Timing Role: Shunt voltage reference regulating supply to sensor Wheatstone bridge. Use Value: ±2 % tolerance and AEC-Q101 qualification ensure consistent sensor output across −40 °C to +125 °C ambient range without recalibration. |
Use Scenario: Generating precise 43 V reference for Li-ion battery protection IC threshold detection. IC Role / Device Role / Timing Role: Low-current Zener reference establishing overvoltage trip point. Use Value: 50 µA test current enables direct connection to high-impedance comparator inputs without loading error. |
| Industrial PLC Input Conditioning | Medical Wearable Power Monitoring |
Use Scenario: Clamping and referencing 24 V DC input signals in programmable logic controller analog input modules. IC Role / Device Role / Timing Role: Overvoltage protection and level-shifting reference diode. Use Value: 300 mW power rating and 375 Ω dynamic resistance maintain accuracy under transient surges up to 40 W peak. |
Use Scenario: Supplying regulated bias to ultra-low-power ECG front-end amplifiers in patch-style monitors. IC Role / Device Role / Timing Role: Precision voltage reference for analog signal chain calibration. Use Value: 40 pF capacitance and <0.05 µA leakage prevent signal distortion and extend battery life beyond 7 days. |
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-C43-Q | ±5 % tolerance vs. ±2 %; identical 43 V nominal, same SOD523 package and AEC-Q101 qualification | Acceptable where cost sensitivity outweighs precision requirement, e.g., non-critical power rail monitoring | Select when tighter tolerance is unnecessary and BOM cost reduction is prioritized |
| MMSZ5268B-7-F | 43 V nominal, ±5 % tolerance, SOD-123 package (2.7 mm × 1.4 mm), 500 mW Ptot, no AEC-Q101 rating | Suitable for industrial/commercial designs but not automotive due to qualification gap and larger footprint | Choose only for non-automotive applications requiring higher power margin and board space availability |
Compared with BZX58550-C43-Q, the BZX58550-B43-QX offers tighter regulation for precision analog circuits; compared with MMSZ5268B-7-F, it provides automotive qualification and 40 % smaller footprint at the expense of 17 % lower power rating.
Availability
BZX58550-B43-QX is available at Aetrix Electronics and suitable for automotive sensor biasing, portable device voltage reference, and industrial PLC input conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX58550-B43-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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency, miniaturization, and automotive-grade robustness.
The BZX58550-Q series belongs to Nexperia's low-current Zener regulator family, engineered specifically for precision voltage referencing in space-constrained, battery-powered, and automotive-qualified applications.
FAQ
What is the maximum reverse voltage before breakdown for BZX58550-B43-QX?
The device is rated for nominal 43 V Zener voltage at 50 µA test current, with guaranteed minimum breakdown voltage of 42.14 V and maximum of 43.86 V under those conditions. Absolute maximum reverse voltage is not defined; operation beyond VZ + 10 % risks irreversible degradation due to thermal runaway.
Can BZX58550-B43-QX be used in series to achieve higher reference voltages?
No - series connection of Zener diodes introduces mismatched temperature coefficients and unequal current sharing, leading to unstable regulation. For >43 V references, use dedicated high-voltage reference ICs or resistor-divider networks with buffered outputs.
Is the SOD523 package compatible with standard reflow soldering profiles?
Yes - the device is qualified for lead-free reflow per J-STD-020, with peak temperature up to 260 °C. Figure 10 in the datasheet specifies exact solder land dimensions (1.2 mm × 0.5 mm pads, 0.4 mm solder mask opening) required to ensure void-free joints and mechanical reliability.
How does the 50 µA test current affect circuit design?
Designers must ensure the series current-limiting resistor delivers ≥50 µA at worst-case input voltage and temperature. Below this, regulation degrades rapidly; above 200 mA forward current or 40 W surge, permanent damage occurs. Use IZ = 100–500 µA for optimal stability and noise performance.
BZX58550-B43-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):
- 43 V
- Tolerance:
- ±2%
- Power - Max:
- 270 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 32.6 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-B43-QX FAQ
1.How can I place an order for BZX58550-B43-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B43-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-B43-QX reliable?
The price and inventory of BZX58550-B43-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-B43-QX is usually 5 days.
3.What payment methods are accepted for BZX58550-B43-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B43-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B43-QX?
BZX58550-B43-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B43-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-B43-QX?
For technical support, including BZX58550-B43-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B43-QX requirements.
6.How does Aetrix verify that BZX58550-B43-QX is sourced from the original manufacturer or authorized distributors?
All BZX58550-B43-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-B43-QX meets industry standards.
7.What is the process for return or replacement of BZX58550-B43-QX?
All BZX58550-B43-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B43-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-B43-QX part is unused and in its original packaging.
Return procedure for BZX58550-B43-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B43-QX 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
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
