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onsemi BZX55C11_T50A
- Part No.:
- BZX55C11_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX55C11_T50A.pdf
- Description:
- DIODE ZENER 11V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:2,071
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Product details
Overview
BZX55C11_T50A from Fairchild Semiconductor is a 11 V ±5% tolerance silicon Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C, with 20 Ω dynamic impedance at 5 mA test current and 0.1 μA maximum reverse leakage at 8.5 V. It provides precise voltage regulation in low-power reference and protection circuits.
For engineers reviewing the BZX55C11_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal derating behavior, cathode identification via color band, DO-35 mechanical compatibility, and compliance with industrial temperature range (–65°C to +200°C).
Technical Context
The BZX55C11_T50A operates as a two-terminal voltage reference device, relying on controlled reverse-bias avalanche breakdown to maintain stable output voltage under varying load and temperature conditions. Its 5% tolerance and 20 Ω Zener impedance at 5 mA ensure predictable regulation within narrow error bands in feedback loops and clamp networks.
Designed for through-hole mounting in DO-35 glass packages, it uses a cathode band for polarity identification and exhibits 4.0 mW/°C linear derating above 75°C ambient lead temperature. Reverse leakage remains ≤0.1 μA at VR = 8.5 V, supporting low-current biasing and high-impedance sensing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 10.4 V min / 11.6 V max at IZ = 5 mA - defines usable regulation window for precision reference design |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous DC power handling before thermal derating applies |
| Dynamic Impedance (ZZ) | 20 Ω @ IZ = 5 mA - determines output voltage variation under load current changes |
| Reverse Leakage (IR) | ≤0.1 μA @ VR = 8.5 V - ensures minimal parasitic current in high-impedance clamping or sensing nodes |
| Operating Temperature | –65°C to +200°C - supports deployment in extended industrial and automotive under-hood environments |
| Forward Voltage (VF) | ≤1.3 V @ IF = 100 mA - enables use as low-drop rectifier or ESD path when forward-biased |
Pinout & Package
DO-35 glass axial package with cathode identified by a single dark band near one end. No active pin numbering - terminals are anode (unbanded end) and cathode (banded end). Mechanical dimensions conform to JEDEC DO-35 standard: 2.0–2.5 mm diameter, 4.0–5.0 mm length, 0.4–0.6 mm lead diameter.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal in forward bias; connected to lower-potential node in reverse-bias regulation | Must be held at potential ≤ (VZ – 0.7 V) to avoid forward conduction during regulation |
| Cathode | Negative terminal in forward bias; connected to regulated output node in reverse-bias configuration | Marked with color band; reverse voltage applied here to activate Zener breakdown |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables consistent performance across production lots without individual calibration in cost-sensitive references |
| DO-35 glass package with axial leads | Provides hermetic sealing and thermal stability for long-term reliability in humid or high-vibration environments |
| 4.0 mW/°C linear derating above 75°C | Allows accurate power budgeting in thermally constrained PCB layouts using standard lead-length assumptions |
| 0.1 μA max reverse leakage at 8.5 V | Minimizes quiescent current draw in battery-powered voltage monitor or supervisor circuits |
| 200°C maximum junction temperature | Supports operation in proximity to heat-generating components without derating penalties beyond specified limits |
Applications
| Overvoltage Protection Clamp | Low-Power Voltage Reference |
|---|---|
Use Scenario: Protecting microcontroller I/O pins from transient surges exceeding 12 V in industrial control panels. IC Role / Device Role / Timing Role: Shunt regulator clamping excess voltage to ~11 V while diverting surge current to ground. Use Value: Prevents latch-up or permanent damage using only passive components; leverages 0.1 μA leakage to avoid loading sensitive input stages. |
Use Scenario: Providing stable 11 V reference for ADC biasing in portable data loggers powered by Li-ion batteries. IC Role / Device Role / Timing Role: Two-terminal voltage source establishing known potential for analog front-end scaling. Use Value: Delivers ±5% accuracy over –40°C to +85°C without trimming; 500 mW rating accommodates 1 mA load with margin. |
| Power Supply Feedback Divider | ESD-Safe Signal Level Translation |
Use Scenario: Setting output voltage of isolated flyback converter via optocoupler feedback network. IC Role / Device Role / Timing Role: Precision shunt element defining upper threshold of resistive divider tied to TL431 cathode. Use Value: 20 Ω ZZ minimizes regulation error caused by divider current variation; DO-35 form factor fits compact transformer-isolated layouts. |
Use Scenario: Translating 3.3 V logic signals to 11 V levels for driving legacy industrial sensors with open-collector outputs. IC Role / Device Role / Timing Role: Bidirectional level shifter using forward conduction (1.3 V) and reverse Zener action (11 V). Use Value: Eliminates need for active translators; 200°C TJ rating ensures robustness against repeated ESD events per IEC 61000-4-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4740A | 10 V nominal, 5% tolerance, DO-41 package, 1.0 W rating, 17 Ω ZZ @ 25 mA | Higher power rating suits higher-current regulation but requires larger PCB footprint | Select when >500 mW dissipation or DO-41 layout compatibility is required |
| MMSZ5240B | 10 V nominal, 5% tolerance, SOD-123 surface-mount package, 500 mW rating, 17 Ω ZZ @ 20 mA | Surface-mount form enables automated assembly and space-constrained designs | Select when board area is limited or reflow-compatible packaging is mandatory |
Compared with BZX55C11_T50A, the 1N4740A offers higher power handling in a larger through-hole package, while the MMSZ5240B delivers identical power rating in a miniature SMT footprint-neither is pin-compatible due to differing packages and test currents, making them functional alternatives rather than drop-in replacements.
Availability
BZX55C11_T50A is available at Aetrix Electronics and suitable for overvoltage protection clamps, low-power voltage references, power supply feedback dividers, and ESD-safe signal level translation requiring stable component supply across industrial, instrumentation, and embedded control programs.
Supply support for BZX55C11_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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, signal conditioning, and discrete components before its acquisition by ON Semiconductor in 2016. Its legacy products remain widely deployed in industrial and automotive systems.
The BZX55 series was developed as a general-purpose, cost-optimized Zener diode family targeting voltage regulation, reference, and protection functions in DC power supplies, sensor interfaces, and analog circuitry where ±5% tolerance and DO-35 reliability are sufficient.
FAQ
What is the exact Zener voltage range for BZX55C11_T50A at 25°C?
The BZX55C11_T50A has a guaranteed Zener voltage range of 10.4 V to 11.6 V at 5 mA test current and 25°C ambient temperature, reflecting its ±5% tolerance specification. This range is measured under thermal equilibrium conditions with 3/8" lead length and TL = 30°C ±1°C, as defined in the Fairchild datasheet Rev. D1. The BZX55C11_T50A maintains this specification across its qualified operating temperature span.
Does BZX55C11_T50A have a specified forward voltage?
Yes, the BZX55C11_T50A specifies a maximum forward voltage of 1.3 V at 100 mA forward current. This parameter is relevant when the device is used in forward-biased configurations such as ESD protection paths or level-shifting circuits. The forward characteristic is consistent with standard silicon diode behavior and is verified per the Absolute Maximum Ratings table in the original Fairchild documentation for BZX55C2V4–BZX55C56.
Can BZX55C11_T50A be used in surface-mount designs?
No, the BZX55C11_T50A is manufactured exclusively in the DO-35 axial glass package and is not available in surface-mount variants. For SMT implementation, engineers should consider alternatives like the MMSZ5240B (10 V) or BZX84-C11 (11 V), which share similar electrical characteristics but use SOD-123 or SOT-23 packages. The BZX55C11_T50A requires through-hole mounting with appropriate lead forming and soldering processes.
What is the maximum reverse leakage current for BZX55C11_T50A?
The BZX55C11_T50A specifies a maximum reverse leakage current of 0.1 μA at a reverse voltage of 8.5 V and 25°C. This value is confirmed in the Electrical Characteristics table of the Fairchild datasheet and reflects the device's ability to minimize standby current in high-impedance clamp or reference applications. Leakage remains within this limit up to 125°C, though actual values may increase slightly at elevated temperatures.
How does thermal derating apply to BZX55C11_T50A?
The BZX55C11_T50A must be derated at 4.0 mW/°C for lead temperatures above 75°C, reducing its usable power dissipation linearly. For example, at TL = 100°C, maximum allowable power drops to 400 mW. Derating is based on lead temperature measurement at 3/8" from the package body and assumes standard PCB copper land patterns. This behavior is critical for reliability in enclosed or high-ambient-temperature environments where the BZX55C11_T50A is deployed.
BZX55C11_T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 11 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 8.5 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 100 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
BZX55C11_T50A FAQ
1.How can I place an order for BZX55C11_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX55C11_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 BZX55C11_T50A reliable?
The price and inventory of BZX55C11_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX55C11_T50A is usually 5 days.
3.What payment methods are accepted for BZX55C11_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX55C11_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX55C11_T50A?
BZX55C11_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX55C11_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 BZX55C11_T50A?
For technical support, including BZX55C11_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX55C11_T50A requirements.
6.How does Aetrix verify that BZX55C11_T50A is sourced from the original manufacturer or authorized distributors?
All BZX55C11_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 BZX55C11_T50A meets industry standards.
7.What is the process for return or replacement of BZX55C11_T50A?
All BZX55C11_T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX55C11_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 BZX55C11_T50A part is unused and in its original packaging.
Return procedure for BZX55C11_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX55C11_T50A Tags
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MMBZ5240B-7-F
Diodes Incorporated
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