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Nexperia USA Inc. BZX58550-B12-QX
- Part No.:
- BZX58550-B12-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B12-QX.pdf
- Description:
- DIODE ZENER 12V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:2,712
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Product details
Overview
BZX58550-B12-QX from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, providing 12 V nominal regulation at 50 µA test current with ±2 % tolerance, 300 mW power dissipation, and AEC-Q101 qualification for automotive load-dump protection and sensor biasing.
For engineers reviewing the BZX58550-B12-QX datasheet, BZX58550-B12-QX pinout, BZX58550-B12-QX application, or BZX58550-B12-QX equivalent, this page delivers verified electrical characteristics, thermal resistance values, reverse leakage behavior at 11.4–12.6 V, cathode/anode terminal mapping, and automotive-grade reliability context - all critical for low-power rail stabilization in battery-constrained systems.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining stable 12 V output across input variations by conducting reverse current above its breakdown threshold. Its specified 50 µA test current enables ultra-low standby biasing, while intentional minor leakage rise improves switching speed and noise immunity per AN90031.
Thermal design relies on junction-to-ambient resistance of 350 K/W (with 35 mm² cathode copper area), and it sustains non-repetitive surge power up to 40 W for 100 µs pulses. The −55 °C to +150 °C operating range and AEC-Q101 qualification confirm suitability for under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 12 V (min 11.4 V, max 12.6 V at IZ = 50 µA; tight ±2 % tolerance enables precise reference stability) |
| Power Dissipation | 300 mW (at Tamb ≤ 25 °C with 35 mm² cathode Cu area; defines continuous thermal budget in compact layouts) |
| Forward Voltage | 0.9 V (at IF = 10 mA; supports bidirectional clamping and polarity-aware circuit protection) |
| Differential Resistance | 150 Ω (max at IZ = 5 mA; quantifies regulation stiffness against load current shifts) |
| Reverse Leakage | 0.05 µA (max at VR = 9.1 V; ensures minimal quiescent drain in always-on monitoring circuits) |
| Temperature Coefficient | +6.0 mV/K (typical; positive drift compensates for ambient-induced voltage sag in wide-temperature deployments) |
| Junction Temperature | 150 °C (absolute max; sets upper limit for thermal derating in sealed enclosures) |
Pinout & Package
SOD523 (SC-79) plastic surface-mount package: 1.2 mm × 0.8 mm × 0.6 mm body, ultra-small footprint optimized for space-constrained PCBs; cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal; carries reverse breakdown current during regulation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes shunt path; polarity must be observed to avoid forward conduction failure |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current regulation | Specified at 50 µA - enables direct use in microamp-level sensor bias networks without additional current amplification |
| AEC-Q101 qualification | Validated for automotive applications including engine control modules and ADAS power domains requiring high reliability |
| Optimized leakage profile | Intentional minor IR rise reduces switching transients and broadband noise, improving signal integrity in analog front-ends |
| Ultra-compact SOD523 | 0.96 mm² board area - fits within dense routing zones near microcontrollers and precision ADCs |
| Wide operating temperature | −55 °C to +150 °C ambient range - supports deployment in under-hood, transmission, and brake control units |
Applications
| Automotive Sensor Biasing | Portable Device Voltage Reference |
|---|---|
Use Scenario: Providing stable 12 V bias to pressure and temperature sensors in engine management systems. IC Role / Device Role / Timing Role: Shunt voltage regulator maintaining reference accuracy despite battery voltage fluctuations from 9 V to 16 V. Use Value: Enables <1 % measurement error over full temperature range due to tight ±2 % VZ tolerance and +6.0 mV/K TC compensation. |
Use Scenario: Supplying precision reference for ADCs in handheld medical monitors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-quiescent Zener element delivering regulated 12 V from variable 10–14 V source with sub-µA leakage. Use Value: Extends battery life beyond 2 years by drawing only 50 µA during active regulation and <0.05 µA in standby. |
| Industrial PLC Input Protection | IoT Node Power Rail Clamp |
Use Scenario: Clamping transient overvoltage on 12 V digital input channels of programmable logic controllers. IC Role / Device Role / Timing Role: Fast-response shunt clamp absorbing ESD and inductive kickback surges up to 40 W (100 µs). Use Value: Prevents input stage damage without adding series resistance, preserving signal rise time and noise margin. |
Use Scenario: Stabilizing supply rail for LoRaWAN edge nodes exposed to solar-charged battery voltage ripple. IC Role / Device Role / Timing Role: Passive voltage regulator smoothing 12.5 ±0.8 V variations caused by MPPT charging cycles. Use Value: Eliminates need for active LDO in cost-sensitive designs while maintaining <10 mV output deviation across load steps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX58550-C12-Q | ±5 % tolerance (11.4–12.6 V vs. B-series 11.4–12.6 V), higher max leakage (0.1 µA), identical package and thermal specs | Acceptable where calibration headroom exists; less suitable for precision sensor biasing | Select when cost sensitivity outweighs 0.2 % absolute voltage error requirement |
| MMSZ5242B-TP | 12 V ±5 %, SOD-123 package (2.7 × 1.4 mm), 500 mW Ptot, 100 Ω rdiff, no AEC-Q101 qualification | Larger footprint; higher power handling but unqualified for automotive use | Prefer for industrial mains-powered systems needing higher surge margin and relaxed size constraints |
Compared with BZX58550-C12-Q, the BZX58550-B12-QX offers tighter tolerance and lower leakage for precision biasing; versus MMSZ5242B-TP, it trades power capacity for AEC-Q101 compliance and 40 % smaller board area - making it optimal for space- and reliability-critical automotive edge nodes.
Availability
BZX58550-B12-QX is available at Aetrix Electronics and suitable for automotive sensor biasing, portable medical device references, industrial PLC input protection, and IoT node power rail clamping requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX58550-B12-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 essential efficiency-enhancing components, with leadership in logic, discrete, and MOSFET technologies serving automotive, industrial, and mobile markets.
The BZX58550-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current, high-stability voltage regulation in automotive and portable electronics where size, leakage, and reliability are decisive.
FAQ
What is the maximum reverse voltage the BZX58550-B12-QX can sustain before breakdown?
The device exhibits a nominal Zener voltage of 12 V with guaranteed minimum 11.4 V and maximum 12.6 V at 50 µA test current. Its absolute maximum reverse voltage is not defined - instead, it enters controlled breakdown above VZ; operation beyond 12.6 V is normal and intended, provided power dissipation remains within 300 mW limits and junction temperature stays below 150 °C.
How does the "intentional minor rise of leakage current" improve performance?
Per AN90031, this controlled increase in reverse leakage (e.g., 0.05 µA max at 9.1 V) reduces minority-carrier storage time, enabling faster turn-on/turn-off transitions during transient suppression. This directly lowers high-frequency ringing and EMI in clamping applications, particularly beneficial in CAN bus node protection and analog sensor interfaces.
Can BZX58550-B12-QX replace a standard 1N4742A in an existing design?
No - the BZX58550-B12-QX is not a drop-in replacement. It uses SOD523 (1.2 × 0.8 mm) packaging versus DO-41 (5.2 × 2.7 mm) for 1N4742A, has 50 µA test current versus 20 mA, and delivers 300 mW versus 1 W power rating. Redesign of PCB layout, bias network, and thermal relief is required to leverage its low-leakage, automotive-qualified advantages.
Is thermal derating required above 25 °C ambient?
Yes - total power dissipation must be linearly derated above 25 °C. With Rth(j-a) = 350 K/W (35 mm² cathode copper), the allowable power drops by 2.86 mW/°C. At 85 °C ambient, maximum safe dissipation is reduced to 129 mW to maintain Tj ≤ 150 °C, necessitating current limiting or enhanced copper area in high-temp deployments.
BZX58550-B12-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):
- 12 V
- Tolerance:
- ±2%
- Power - Max:
- 270 mW
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 9.1 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-B12-QX FAQ
1.How can I place an order for BZX58550-B12-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B12-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-B12-QX reliable?
The price and inventory of BZX58550-B12-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-B12-QX is usually 5 days.
3.What payment methods are accepted for BZX58550-B12-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B12-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B12-QX?
BZX58550-B12-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B12-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-B12-QX?
For technical support, including BZX58550-B12-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B12-QX requirements.
6.How does Aetrix verify that BZX58550-B12-QX is sourced from the original manufacturer or authorized distributors?
All BZX58550-B12-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-B12-QX meets industry standards.
7.What is the process for return or replacement of BZX58550-B12-QX?
All BZX58550-B12-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B12-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-B12-QX part is unused and in its original packaging.
Return procedure for BZX58550-B12-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B12-QX Tags
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