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onsemi BZX85C47
- Part No.:
- BZX85C47
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C47.pdf
- Description:
- DIODE ZENER 47V 1.3W DO41G
- Quantity:
- Payment:
- Shipping:
Inventory:28,500
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Product details
Overview
BZX85C47 from Fairchild Semiconductor is a 47 V ±5% tolerance, 1.0 W axial-leaded Zener diode in DO-41 glass package, designed for precision voltage regulation and reference applications in power supply feedback loops, overvoltage protection circuits, and analog signal conditioning stages.
For engineers reviewing the BZX85C47 datasheet, pinout, applications, or equivalent options, key selection criteria include its 47 V nominal Zener voltage at 90 mA test current, 1500 Ω maximum Zener impedance at 1 mA, 0.25 μA maximum leakage at 33 V reverse bias, and DO-41 thermal derating profile (6.67 mW/°C above 50°C).
Technical Context
The BZX85C47 operates as a two-terminal silicon junction device with sharp reverse-breakdown characteristics, optimized for stable DC voltage reference under fixed-current biasing. Its Zener voltage is specified at IZ = 90 mA with thermal equilibrium maintained at lead temperature TL = 30°C ±1°C and 3/8″ lead length.
It exhibits a typical forward voltage of ≤1.2 V at 200 mA forward current and supports operation across -65°C to +200°C junction/storage temperature range. The device uses hermetically sealed glass DO-41 packaging with cathode band marking per JEDEC DO-204AL standard.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 44 V to 50 V at IZ = 90 mA - defines regulated output voltage range for feedback or clamping use cases |
| Power Dissipation (PD) | 1.0 W @ TA = 25°C - sets maximum continuous power handling in ambient-convection conditions |
| Zener Impedance (ZZ) | 1500 Ω max @ IZK = 1 mA - indicates dynamic resistance affecting regulation accuracy under light-load conditions |
| Leakage Current (IR) | 0.25 μA max @ VR = 33 V - ensures minimal parasitic current draw in high-impedance bias networks |
| Operating Temp Range | -65°C to +200°C - enables deployment in automotive under-hood, industrial motor control, and aerospace environments |
| Forward Voltage (VF) | ≤1.2 V @ IF = 200 mA - supports bidirectional transient suppression when used with series resistor |
Pinout & Package
DO-41 glass axial-leaded package with cathode identified by color band on body; leads are non-polarized but functionally asymmetric-cathode must be connected to higher potential for Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Lower-potential terminal during Zener conduction | Connected to ground or low-side reference node in shunt regulator configurations |
| Cathode | Higher-potential terminal during Zener conduction | Connected to input rail or error amplifier in feedback loop; marked with band |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable regulation without post-production trimming in cost-sensitive designs |
| 1.0 W power rating | Supports robust overvoltage clamping in 12–48 V industrial power rails without external heat sinking |
| DO-41 glass package | Provides hermetic sealing and long-term stability for high-reliability analog references |
| Low leakage at 33 V | Minimizes error in high-gain op-amp reference circuits where bias currents affect offset |
| JEDEC-compliant marking | Ensures traceability and compatibility with automated assembly systems using vision-based orientation detection |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating output voltage in flyback or forward converter feedback path via optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Precision voltage reference providing stable 47 V threshold for TL431-type comparator input. Use Value: Maintains ±1% output regulation across line/load variations due to tight VZ tolerance and low ZZ at operating current. |
Use Scenario: Biasing and level-shifting analog sensor outputs (e.g., RTD bridges, strain gauges) before ADC input. IC Role / Device Role / Timing Role: Stable reference node for ratiometric scaling and common-mode rejection in instrumentation amplifiers. Use Value: Reduces drift-induced measurement error by limiting reference voltage variation to <±0.5% over -40°C to +85°C ambient. |
| Overvoltage Protection Clamp | Programmable Threshold Detector |
Use Scenario: Protecting microcontroller I/O pins or analog front-ends from transient surges exceeding 36 V in 24 V industrial PLC modules. IC Role / Device Role / Timing Role: Shunt clamp activated above 47 V to divert excess current away from sensitive downstream circuitry. Use Value: Limits peak voltage to ≤49 V with <100 ns response, preventing latch-up or gate oxide damage in CMOS inputs. |
Use Scenario: Setting precise trip point for comparator-based battery end-of-charge detection in 48 V telecom backup systems. IC Role / Device Role / Timing Role: Reference voltage source for LM393 comparator input, triggering charge termination at 54.05 V pack voltage. Use Value: Achieves ±0.25 V threshold accuracy without trimming, reducing BOM count and calibration steps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4753A | Same 47 V nominal VZ, ±5% tolerance, but rated at 1.0 W in DO-41; ZZ = 1500 Ω max @ 1 mA (identical), leakage = 0.5 μA @ 33 V (2× higher) | Suitable for general-purpose regulation but less optimal in ultra-low-bias circuits like high-Z op-amp references | Select BZX85C47 when leakage-limited accuracy is critical; choose 1N4753A for legacy design reuse or broader distributor availability |
| MMBZ5270B | Surface-mount SOD-123 package, same 47 V VZ and tolerance, but PD = 350 mW and ZZ = 1700 Ω max - lower power and higher impedance | Applicable only in space-constrained PCB layouts where through-hole mounting is prohibited | Use MMBZ5270B for compact consumer electronics; retain BZX85C47 for industrial-grade thermal margin and reliability |
Compared with 1N4753A and MMBZ5270B, the BZX85C47 delivers superior leakage performance in through-hole designs requiring long-term reference stability, while maintaining identical Zener voltage specification and thermal robustness in DO-41 packaging.
Availability
BZX85C47 is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface modules, and overvoltage protection circuits requiring stable component supply with full traceability and lifecycle continuity.
Supply support for BZX85C47 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
Fairchild Semiconductor was a leading designer of high-performance analog and discrete semiconductors, acquired by ON Semiconductor in 2016; its legacy products remain widely deployed in industrial and automotive systems.
The BZX85 series was engineered specifically for cost-effective, high-stability voltage reference and clamping in ruggedized power electronics, emphasizing thermal resilience and process-controlled Zener voltage distribution.
FAQ
What is the Zener voltage tolerance for BZX85C47?
The BZX85C47 has a guaranteed Zener voltage range of 44 V to 50 V at IZ = 90 mA, corresponding to ±5% tolerance per the Fairchild datasheet Rev. 1.1.0. This tolerance is measured under controlled thermal equilibrium conditions (TL = 30°C ±1°C) and defines the usable regulation window for precision reference applications. The BZX85C47 maintains this specification across its qualified operating temperature range.
Can BZX85C47 be used in surface-mount designs?
No, the BZX85C47 is exclusively packaged in the axial-leaded DO-41 glass case and requires through-hole mounting. It is not compatible with SMT reflow or wave soldering processes. For surface-mount equivalents, consider the MMBZ5270B (SOD-123) or BZX84-C47 (SOT-23), though these differ in power rating, impedance, and thermal behavior. The BZX85C47 must be mounted with appropriate lead-forming and axial clearance.
What is the maximum leakage current for BZX85C47 at 33 V reverse bias?
The BZX85C47 specifies a maximum leakage current of 0.25 μA at VR = 33 V and TA = 25°C. This value is confirmed in the Electrical Characteristics table on page 2 of the Fairchild datasheet. Low leakage ensures minimal loading of high-impedance bias networks, making the BZX85C47 suitable for precision analog references where current errors directly impact accuracy.
How does the thermal derating of BZX85C47 work above 50°C?
The BZX85C47 derates linearly at 6.67 mW/°C above 50°C ambient temperature, reducing its maximum allowable power dissipation from 1.0 W at 25°C to zero at approximately 200°C. This derating curve is defined in the Absolute Maximum Ratings table and reflects the DO-41 package's thermal resistance to ambient. Designers must apply this slope when calculating safe operating area in elevated-temperature environments such as enclosed industrial enclosures.
Is BZX85C47 suitable for automotive applications?
Yes, the BZX85C47 supports an operating and storage temperature range of -65°C to +200°C, which exceeds AEC-Q200 Grade 1 (-40°C to +125°C) requirements. Its DO-41 glass construction provides hermetic sealing and long-term parameter stability under thermal cycling. While not AEC-Q200 certified out-of-box, the BZX85C47 is widely used in automotive subsystems such as body control modules and powertrain sensors where its voltage reference performance and ruggedness are validated in system-level testing.
BZX85C47 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 47 V
- Tolerance:
- ±5%
- Power - Max:
- 1.3 W
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 36 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41G
BZX85C47 FAQ
1.How can I place an order for BZX85C47 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C47 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 BZX85C47 reliable?
The price and inventory of BZX85C47 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C47 is usually 5 days.
3.What payment methods are accepted for BZX85C47?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C47 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C47?
BZX85C47 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C47 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 BZX85C47?
For technical support, including BZX85C47 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C47 requirements.
6.How does Aetrix verify that BZX85C47 is sourced from the original manufacturer or authorized distributors?
All BZX85C47 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 BZX85C47 meets industry standards.
7.What is the process for return or replacement of BZX85C47?
All BZX85C47 units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C47, 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 BZX85C47 part is unused and in its original packaging.
Return procedure for BZX85C47:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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