My Inquiry
My Account
Nexperia USA Inc. BZX58550-B4V3-QX
- Part No.:
- BZX58550-B4V3-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B4V3-QX.pdf
- Description:
- DIODE ZENER 4.3V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:9,805
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX58550-B4V3-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 circuits. It delivers a nominal 4.3 V regulation at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and 4.0 µA max reverse current at VR = 4.3 V - ideal for battery-powered sensor nodes and automotive body electronics.
For engineers reviewing the BZX58550-B4V3-Q datasheet, BZX58550-B4V3-Q pinout, BZX58550-B4V3-Q application, or BZX58550-B4V3-Q equivalent, this page provides verified electrical characteristics, AEC-Q101 qualification status, thermal resistance data, and automotive-grade reliability context essential for low-current regulation design validation.
Technical Context
This device operates as a two-terminal silicon Zener diode with sharp reverse breakdown at 4.3 V, specified under low test current (IZ = 50 µA) to minimize self-heating and support ultra-low-power biasing. Its differential resistance is ≤95 Ω at IZ = 5 mA, and temperature coefficient is −2.7 mV/K, enabling stable reference performance across −55 °C to +150 °C ambient.
The SOD523 package features a cathode-marked anode-cathode configuration with 1.2 mm × 0.8 mm × 0.6 mm footprint and 285 K/W junction-to-ambient thermal resistance on 1 cm² cathode copper pad - optimized for thermal management in dense PCB layouts typical of automotive control modules and portable instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 4.3 V at IZ = 50 µA - defines precise regulation point for low-bias reference circuits |
| Tolerance | ±2 % - ensures tight voltage accuracy without post-production trimming |
| Max Reverse Current | 4.0 µA at VR = 4.3 V - enables microamp-level standby leakage control in always-on systems |
| Differential Resistance | ≤95 Ω at IZ = 5 mA - maintains regulation stability under small load variations |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C on FR4 with 35 mm² cathode Cu - supports continuous operation in compact automotive PCBs |
| Junction Temperature Range | −55 °C to +150 °C - qualified for under-hood and cabin-mounted automotive electronics |
| AEC-Q101 Qualified | Yes - validated for automotive discrete semiconductor stress testing per AEC standard |
Pinout & Package
SOD523 (SC-79) plastic surface-mount package: 2-pin, ultra-small outline (1.2 mm × 0.8 mm × 0.6 mm), flat lead, cathode identified by marking bar.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output 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 specification | 50 µA - enables accurate regulation in µA-level bias networks without significant current draw |
| Ultra-small SOD523 footprint | 1.2 mm × 0.8 mm - saves board area in high-density automotive ECUs and wearables |
| Automotive qualification | AEC-Q101 compliant - meets stress-test requirements for automotive discrete semiconductors |
| Controlled temperature coefficient | −2.7 mV/K - minimizes drift over temperature in reference circuits requiring <100 ppm/°C stability |
| Optimized leakage behavior | 4.0 µA max IR at VR = 4.3 V - supports low-quiescent-current power management in battery-backed systems |
Applications
| Automotive Body Control Module | Portable Gas Sensor Biasing |
|---|---|
Use Scenario: Providing stable 4.3 V reference for microcontroller ADC input scaling and analog front-end conditioning in door module ECUs. IC Role / Device Role / Timing Role: Zener voltage reference diode establishing precision DC bias point for signal chain integrity. Use Value: ±2 % tolerance and −2.7 mV/K TC ensure <±15 mV variation over −40 °C to +125 °C operating range, eliminating need for calibration. |
Use Scenario: Supplying low-current bias voltage to electrochemical gas sensor elements in handheld air quality monitors. IC Role / Device Role / Timing Role: Low-leakage voltage regulator maintaining constant sensor excitation potential. Use Value: 4.0 µA max reverse current at 4.3 V prevents battery drain in multi-year battery-operated deployments. |
| Industrial IoT Node Power Supervision | Medical Wearable Reference Circuit |
Use Scenario: Monitoring supply rail integrity in battery-powered predictive maintenance sensors using comparator-based undervoltage detection. IC Role / Device Role / Timing Role: Precision Zener element setting threshold voltage for supervisor IC input. Use Value: 95 Ω differential resistance ensures minimal threshold shift under varying load conditions during brown-out events. |
Use Scenario: Generating stable reference for analog front-end amplifiers in ECG patch devices requiring low-noise, low-drift DC bias. IC Role / Device Role / Timing Role: Low-noise voltage reference diode minimizing signal path error sources. Use Value: Optimized leakage profile and AEC-Q101 qualification support long-term reliability in Class II medical applications. |
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-C4V3-Q | ±5 % tolerance vs. ±2 %; identical 4.3 V nominal, same SOD523 package | Acceptable where tighter regulation accuracy is not required, e.g., non-critical power rail clamping | Select when cost sensitivity outweighs voltage accuracy needs in high-volume consumer designs |
| MMSZ4V3T1G | ±5 % tolerance; 300 mW Ptot; 100 Ω rdiff at 5 mA; not AEC-Q101 qualified | Limited to industrial/commercial use; lacks automotive stress qualification and tighter TC spec | Use only in non-automotive applications where AEC-Q101 compliance is not mandated |
Compared with BZX58550-C4V3-Q and MMSZ4V3T1G, the BZX58550-B4V3-Q offers superior voltage accuracy (±2 %), automotive qualification, and lower temperature coefficient (−2.7 mV/K), making it the sole choice for safety-relevant or thermally demanding automotive reference designs.
Availability
BZX58550-B4V3-Q is available at Aetrix Electronics and suitable for automotive body electronics, portable sensor biasing, industrial IoT power supervision, and medical wearable reference circuits requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX58550-B4V3-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 logic, discrete, and MOSFET solutions, with leadership in automotive-qualified components.
The BZX58550-Q series belongs to Nexperia's low-current Zener regulator portfolio, engineered specifically for precision voltage referencing in space- and power-constrained automotive and portable electronics.
FAQ
What is the maximum forward voltage for BZX58550-B4V3-Q?
The maximum forward voltage is 0.9 V at IF = 10 mA, measured under pulse test conditions (tp ≤ 300 µs, duty cycle ≤ 0.02). This value reflects typical conduction behavior in series bias configurations and is independent of Zener regulation operation.
Can BZX58550-B4V3-Q be used in place of a 4.3 V shunt regulator in automotive infotainment systems?
Yes - its AEC-Q101 qualification, −55 °C to +150 °C operating range, and 300 mW power rating make it suitable for regulated 4.3 V bias generation in infotainment system microcontroller peripherals, provided layout includes ≥35 mm² copper at the cathode for thermal management.
How does the 50 µA test current affect circuit design?
The 50 µA test current means the diode achieves its specified 4.3 V Zener voltage under that exact bias condition. Designers must ensure the external current source or resistor network delivers ≥50 µA but stays within the 300 mW dissipation limit - typically achieved with >10 kΩ series resistors at 12 V supply.
Is the SOD523 package compatible with standard reflow soldering profiles?
Yes - Nexperia specifies compatibility with JEDEC J-STD-020D reflow profiles. The recommended footprint (Fig. 10) uses 0.5 mm solder lands and 2.15 mm occupied area; peak temperature must not exceed 260 °C for ≤30 seconds to avoid package damage or delamination.
BZX58550-B4V3-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):
- 4.3 V
- Tolerance:
- ±2%
- Power - Max:
- 270 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 4 µA @ 2 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-B4V3-QX FAQ
1.How can I place an order for BZX58550-B4V3-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B4V3-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-B4V3-QX reliable?
The price and inventory of BZX58550-B4V3-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-B4V3-QX is usually 5 days.
3.What payment methods are accepted for BZX58550-B4V3-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B4V3-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B4V3-QX?
BZX58550-B4V3-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B4V3-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-B4V3-QX?
For technical support, including BZX58550-B4V3-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B4V3-QX requirements.
6.How does Aetrix verify that BZX58550-B4V3-QX is sourced from the original manufacturer or authorized distributors?
All BZX58550-B4V3-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-B4V3-QX meets industry standards.
7.What is the process for return or replacement of BZX58550-B4V3-QX?
All BZX58550-B4V3-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B4V3-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-B4V3-QX part is unused and in its original packaging.
Return procedure for BZX58550-B4V3-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B4V3-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…
