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onsemi BZX85C56_T50R
- Part No.:
- BZX85C56_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C56_T50R.pdf
- Description:
- DIODE ZENER 56V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:9,167
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Product details
Overview
BZX85C56_T50R from onsemi is a 56 V ±5% tolerance, 1.0 W axial-leaded Zener diode in DO-41 glass package, with zener impedance of 4 Ω at 120 mA test current, leakage current ≤0.25 μA at 39 V reverse voltage, and forward voltage ≤1.2 V at 200 mA - used for precision voltage regulation in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the BZX85C56_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, power derating above 50°C (6.67 mW/°C), thermal resistance (junction-to-lead), cathode band marking, and DO-41 mechanical compatibility with through-hole PCB layouts.
Technical Context
This device operates as a two-terminal voltage reference, maintaining stable 56 V across its terminals under reverse-biased conditions when current exceeds the knee point (IZK). Its 1.0 W power rating at 25°C enables use in medium-power shunt regulation without active heat sinking.
The DO-41 glass package provides hermetic sealing and thermal stability up to +200°C junction temperature. Zener voltage is specified at lead temperature TL = 30°C ±1°C with 3/8″ lead length, ensuring repeatable measurement conditions per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 52 V min / 60 V max at IZ = 120 mA - defines regulated output range for feedback or clamp applications |
| Zener Impedance (ZZ) | 4 Ω at IZ = 120 mA - low dynamic resistance ensures minimal output voltage variation under load changes |
| Power Dissipation (PD) | 1.0 W at TA = 25°C - sets maximum continuous power handling before thermal derating begins |
| Leakage Current (IR) | ≤0.25 μA at VR = 39 V - guarantees negligible standby current in high-impedance sensing or battery-critical circuits |
| Forward Voltage (VF) | ≤1.2 V at IF = 200 mA - supports bidirectional protection or dual-use as rectifier in low-voltage clamping paths |
| Operating Temperature | −65°C to +200°C - enables deployment in automotive engine compartments and industrial motor control enclosures |
| Package | DO-41 glass case with cathode band - standard axial footprint compatible with legacy through-hole assembly and wave soldering |
Pinout & Package
DO-41 glass axial package: cylindrical body with two leads; cathode identified by a single color band near one end. Leads are tinned copper-clad steel, suitable for manual or automated through-hole insertion.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal under forward bias | Connected to lower-potential node in shunt regulator; carries full load current during conduction |
| Cathode | Negative terminal under forward bias; Zener terminal under reverse bias | Marked with color band; connected to regulated voltage node in feedback networks or clamping points |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Ensures predictable regulation across production lots without post-assembly trimming |
| Low zener impedance (4 Ω) | Maintains tight voltage control under dynamic load transients in switching power supplies |
| Hermetically sealed glass package | Prevents moisture ingress and parameter drift in humid or outdoor environments |
| High junction temperature rating (+200°C) | Supports operation adjacent to heat-generating components like MOSFETs or transformers |
| Standard DO-41 footprint | Enables drop-in replacement in existing designs using legacy Zener families (e.g., 1N47xx) |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp for Microcontroller I/O |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference establishes precise 56 V threshold at secondary-side error amplifier input. Use Value: Tight 5% tolerance and low ZZ minimize output voltage drift across line/load/temperature variations. |
Use Scenario: Protects 3.3 V or 5 V GPIO pins from transient surges exceeding rail voltage. IC Role / Device Role / Timing Role: Shunt clamp diverts excess energy to ground when input exceeds 56 V breakdown. Use Value: Sub-microamp leakage preserves signal integrity and prevents false triggering in high-impedance inputs. |
| Industrial Sensor Signal Conditioning | DC Link Voltage Monitoring |
Use Scenario: Stabilizes excitation voltage for strain gauge bridges in load cells operating at ambient −40°C to +85°C. IC Role / Device Role / Timing Role: Provides fixed reference for ratiometric ADC measurements independent of supply fluctuations. Use Value: Wide −65°C to +200°C operating range ensures calibration stability across environmental stress tests. |
Use Scenario: Monitors 48 V or 60 V DC bus in motor drives to trigger shutdown if voltage exceeds safe limit. IC Role / Device Role / Timing Role: Zener-based comparator input sets trip threshold at 56 V with hysteresis via resistor network. Use Value: Low 4 Ω impedance ensures fast response to overvoltage events without significant voltage overshoot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4764A | 56 V nominal, ±5%, 1.0 W, DO-41, but higher ZZ = 15 Ω at 112 mA | Less stable regulation under fast load steps; higher thermal resistance (RθJL = 50°C/W vs. 40°C/W) | Acceptable where cost sensitivity outweighs dynamic performance requirements |
| BZX85C56-TR | Same electrical specs, but tape-and-reel packaging (not axial bulk); identical DO-41 form factor | No difference in circuit function; optimized for automated SMT-compatible pick-and-place despite axial leads | Preferred for high-volume manufacturing with reel-fed placement equipment |
Compared with BZX85C56_T50R, the 1N4764A offers lower cost but sacrifices regulation accuracy under dynamic loads due to higher impedance, while BZX85C56-TR delivers identical electrical behavior with logistics advantages for automated assembly - making the T50R variant optimal for prototyping and low-volume through-hole builds.
Availability
BZX85C56_T50R is available at Aetrix Electronics and suitable for switch-mode power supply feedback, overvoltage clamp for microcontroller I/O, and industrial sensor signal conditioning requiring stable component supply and long-term obsolescence management.
Supply support for BZX85C56_T50R 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 supplier specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The BZX85C series was designed for general-purpose voltage regulation and transient suppression in cost-sensitive, high-reliability through-hole applications - emphasizing robustness, wide temperature operation, and JEDEC-standard compatibility.
FAQ
What is the zener voltage tolerance for BZX85C56_T50R?
The BZX85C56_T50R has a zener voltage tolerance of ±5%, meaning its rated breakdown voltage falls between 52 V and 60 V when tested at 120 mA. This tolerance is guaranteed across the full operating temperature range and is verified per onsemi's production test flow. The BZX85C56_T50R datasheet specifies this as a hard limit, not a typical value.
Can BZX85C56_T50R be used in surface-mount designs?
No - the BZX85C56_T50R uses a DO-41 axial glass package with 0.4–0.6 mm diameter leads intended for through-hole mounting. It is not compatible with reflow soldering or standard SMT processes. For surface-mount equivalents, consider the NSZ56V or MMBZ5256B, which offer similar 56 V regulation in SOD-123 packages.
What is the maximum allowable reverse voltage before breakdown for BZX85C56_T50R?
The BZX85C56_T50R begins controlled zener conduction at its nominal 56 V rating, with guaranteed breakdown occurring no later than 60 V (maximum VZ) at IZ = 120 mA. Below 39 V reverse voltage, leakage remains ≤0.25 μA - so 39 V represents the practical upper limit for non-conducting operation. Exceeding 60 V risks irreversible avalanche damage.
How does thermal derating affect BZX85C56_T50R power handling?
BZX85C56_T50R derates linearly at 6.67 mW/°C above 50°C ambient. At 100°C, its usable power drops to 1.0 W − (50 × 6.67 mW) = 0.667 W. This derating applies to ambient temperature (TA), not junction temperature, and assumes free-air conditions - heatsinking or board copper can improve effective dissipation.
Is BZX85C56_T50R RoHS compliant and halogen-free?
Yes - BZX85C56_T50R meets RoHS Directive 2011/65/EU and is halogen-free per J-STD-709. onsemi confirms compliance in the official device summary document (Order Number: BZX85C3V3/D, Rev. 2, October 2017), and the DO-41 glass package contains no lead in solder or encapsulant. Full material declarations are available upon request.
BZX85C56_T50R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- 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_T50R FAQ
1.How can I place an order for BZX85C56_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C56_T50R 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_T50R reliable?
The price and inventory of BZX85C56_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C56_T50R is usually 5 days.
3.What payment methods are accepted for BZX85C56_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C56_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C56_T50R?
BZX85C56_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C56_T50R 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_T50R?
For technical support, including BZX85C56_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C56_T50R requirements.
6.How does Aetrix verify that BZX85C56_T50R is sourced from the original manufacturer or authorized distributors?
All BZX85C56_T50R 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_T50R meets industry standards.
7.What is the process for return or replacement of BZX85C56_T50R?
All BZX85C56_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C56_T50R, 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_T50R part is unused and in its original packaging.
Return procedure for BZX85C56_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX85C56_T50R Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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Micro Commercial Co
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Diodes Incorporated
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