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onsemi BZX85C56_T50A
- Part No.:
- BZX85C56_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C56_T50A.pdf
- Description:
- DIODE ZENER 56V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:4,537
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Product details
Overview
BZX85C56_T50A from onsemi is a 56 V ±5% tolerance Zener diode in DO-41 glass package, rated for 1.0 W power dissipation at 25°C, with 4 Ω zener impedance at 5 mA test current and 120 Ω dynamic impedance at 1 mA knee current. It operates across –65°C to +200°C and serves as a precision voltage reference or overvoltage clamp in DC power supply regulation circuits.
For engineers reviewing the BZX85C56_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include its 56 V nominal Zener voltage, 5% tolerance, 1.0 W thermal rating at ambient, DO-41 axial leaded package compatibility, and low leakage (≤0.25 μA at 42 V reverse bias).
Technical Context
The BZX85C56_T50A is a silicon planar Zener diode optimized for stable voltage regulation under reverse-biased operation. Its 56 V breakdown voltage is specified at IZ = 5 mA with thermal equilibrium maintained at 30°C lead temperature per JEDEC test method.
It exhibits a 2000 Ω maximum dynamic impedance (ZZK) at IZK = 1 mA, confirming sharp knee behavior suitable for low-current reference applications. Forward voltage is capped at 1.2 V at 200 mA, supporting bidirectional protection use cases when paired with complementary devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 52–60 V at IZ = 5 mA; defines precise clamping threshold for overvoltage protection or reference stability |
| Tolerance | ±5%; ensures predictable voltage margin in feedback loops or comparator thresholds |
| Power Dissipation (PD) | 1.0 W @ TA = 25°C; sets maximum continuous power handling without heatsinking |
| Zener Impedance (ZZ) | 4 Ω @ IZ = 5 mA; indicates low AC impedance for stable regulation under varying load |
| Leakage Current (IR) | ≤0.25 μA @ VR = 42 V; guarantees minimal standby current in high-impedance sensing nodes |
| Operating Temperature | –65°C to +200°C; supports deployment in automotive under-hood, industrial motor control, and aerospace environments |
Pinout & Package
DO-41 glass axial-leaded package with cathode indicated by a color band. Leads are tinned copper-clad steel; body diameter 2.03–2.72 mm, length ≥25.40 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse bias reference ground node | Connected to lower-potential side in shunt regulator; carries full load current during clamping |
| Cathode | Zener breakdown terminal / Voltage reference output node | Connected to regulated rail; defines 56 V reference point relative to anode potential |
Key Features
| Feature | Design Value |
|---|---|
| Stable Zener voltage with tight 5% tolerance | Enables accurate voltage setting in feedback networks without post-calibration |
| Low dynamic impedance at knee current | 2000 Ω @ 1 mA ensures usable regulation even in micro-power monitoring circuits |
| High-temperature operation up to +200°C | Validates use in engine control units and power converter hot zones without derating |
| DO-41 mechanical standardization | Ensures compatibility with legacy through-hole PCB tooling and automated insertion equipment |
Applications
| DC Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing output of unregulated linear power supplies feeding analog sensor front-ends. IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed 56 V reference to op-amp error amplifier. Use Value: Maintains ±0.5 V regulation accuracy over 10–100 mA load range due to 4 Ω ZZ and 1.0 W thermal headroom. |
Use Scenario: Clamping transient surges on 48 V telecom distribution rails during lightning-induced spikes. IC Role / Device Role / Timing Role: Primary crowbar element diverting >60 V transients to ground before downstream ICs experience overstress. Use Value: Responds within nanoseconds with ≤0.25 μA leakage below clamp threshold, minimizing standby power loss. |
| Industrial Sensor Excitation | Automotive ECU Reference |
Use Scenario: Providing excitation voltage to strain-gauge bridges in weigh-scale load cells operating at elevated ambient temperatures. IC Role / Device Role / Timing Role: Precision voltage source referenced to system ground, isolated from supply ripple via series resistor. Use Value: Delivers stable 56 V ±2.8 V over –40°C to +125°C ambient thanks to wide TJ range and low TCZ. |
Use Scenario: Generating internal reference for ADC input scaling in engine control modules exposed to under-hood heat. IC Role / Device Role / Timing Role: Secondary reference stabilizer backing up primary regulator during cold-crank brownout conditions. Use Value: Functions reliably at +175°C junction temperature, meeting AEC-Q101 stress requirements for automotive grade components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5385B | 56 V, ±5%, 5 W rating, DO-201AD package; higher power but larger footprint | Suitable for higher-energy surge clamping where 1.0 W is insufficient | Select when thermal design allows larger package and >1 W continuous dissipation is required |
| MMSZ5256B | 56 V, ±5%, 500 mW, SOD-123 surface-mount package; smaller size, lower power | Preferred for space-constrained PCBs where reflow assembly replaces through-hole | Choose for modern compact designs requiring automated placement and reduced board area |
Compared with 1N5385B and MMSZ5256B, the BZX85C56_T50A offers the optimal balance of legacy DO-41 compatibility, 1.0 W thermal capability, and industrial-grade temperature range - making it ideal for service replacement, ruggedized power supplies, and cost-sensitive through-hole production.
Availability
BZX85C56_T50A is available at Aetrix Electronics and suitable for DC power supply regulation, overvoltage protection circuits, and industrial sensor excitation requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for BZX85C56_T50A 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
onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BZX85C56_T50A belongs to the BZX85C series of general-purpose Zener diodes designed for reliable voltage regulation and transient suppression in cost-sensitive, high-volume industrial and automotive applications.
FAQ
What is the Zener voltage tolerance for BZX85C56_T50A?
The BZX85C56_T50A has a nominal Zener voltage of 56 V with a guaranteed tolerance of ±5%, meaning the actual measured VZ falls between 52 V and 60 V when tested at IZ = 5 mA and TL = 30°C. This tolerance is confirmed in the onsemi datasheet Rev. 2 (October 2017) and applies to all units shipped under this part number.
Can BZX85C56_T50A be used in surface-mount designs?
No - the BZX85C56_T50A uses a DO-41 axial-leaded glass package intended for through-hole mounting. It is not compatible with reflow soldering or pick-and-place automation. For surface-mount equivalents, consider the MMSZ5256B (SOD-123) or BZT52-B56 (SOD-123), both offering identical 56 V ±5% Zener characteristics in compact packages.
What is the maximum leakage current specification for BZX85C56_T50A?
The BZX85C56_T50A specifies a maximum leakage current (IR) of 0.25 μA at VR = 42 V and TA = 25°C. This ultra-low leakage enables use in high-impedance reference nodes and battery-powered monitoring circuits where standby current must remain below 1 μA.
Does BZX85C56_T50A meet automotive qualification standards?
The BZX85C56_T50A is not AEC-Q101 qualified as a standalone part, but its construction (DO-41 glass package, –65°C to +200°C operating range) and onsemi's qualification of the broader BZX85C family support use in automotive under-hood applications. System-level validation is required for AEC-compliant designs.
How does the thermal derating work for BZX85C56_T50A above 50°C?
For BZX85C56_T50A, power dissipation must be linearly derated above 50°C ambient at 6.67 mW/°C. Starting from 1.0 W at 25°C, this yields ~667 mW maximum at 75°C ambient and ~333 mW at 125°C ambient - critical for thermal design in enclosed enclosures or high-temperature environments.
BZX85C56_T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 56 V
- Tolerance:
- ±7%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 120 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 39 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
BZX85C56_T50A FAQ
1.How can I place an order for BZX85C56_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C56_T50A 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 BZX85C56_T50A reliable?
The price and inventory of BZX85C56_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C56_T50A is usually 5 days.
3.What payment methods are accepted for BZX85C56_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C56_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C56_T50A?
BZX85C56_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C56_T50A 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 BZX85C56_T50A?
For technical support, including BZX85C56_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C56_T50A requirements.
6.How does Aetrix verify that BZX85C56_T50A is sourced from the original manufacturer or authorized distributors?
All BZX85C56_T50A 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 BZX85C56_T50A meets industry standards.
7.What is the process for return or replacement of BZX85C56_T50A?
All BZX85C56_T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C56_T50A, 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 BZX85C56_T50A part is unused and in its original packaging.
Return procedure for BZX85C56_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX85C56_T50A Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZT52C15-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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onsemi
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Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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SMAZ12-13-F
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