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onsemi BZX55C3V3_T26A
- Part No.:
- BZX55C3V3_T26A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX55C3V3_T26A.pdf
- Description:
- DIODE ZENER 3.3V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:3,792
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Product details
Overview
BZX55C3V3_T26A from Fairchild Semiconductor is a 3.3 V, ±5% tolerance Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C with 85 Ω dynamic impedance at 5 mA test current and 2 μA reverse leakage at 1 V reverse voltage. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning circuits.
For engineers reviewing the BZX55C3V3_T26A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy, thermal derating behavior, junction temperature range (–65°C to +200°C), and compatibility with through-hole PCB layouts requiring DO-35 footprint.
Technical Context
The BZX55C3V3_T26A operates as a silicon planar Zener diode optimized for stable voltage regulation in low-current bias networks. Its 3.3 V nominal breakdown voltage is specified at 5 mA test current with tight 5% tolerance and measured under thermal equilibrium at lead temperature of 30°C ±1°C using 3/8″ lead length.
It exhibits 85 Ω dynamic impedance (ZZ) at IZ = 5 mA, 2 μA reverse leakage (IR) at VR = 1 V, and supports maximum zener current (IZM) of 115 mA at 25°C - all defined per JEDEC-standard test conditions for discrete Zener diodes in axial-leaded packages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.1 V to 3.5 V at 5 mA - defines usable regulation window for 3.3 V rail stabilization |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous power before thermal derating begins |
| Dynamic Impedance (ZZ) | 85 Ω @ IZ = 5 mA - determines output voltage variation under load current changes |
| Reverse Leakage (IR) | 2 μA @ VR = 1 V - indicates low standby current draw in clamping or reference configurations |
| Max Zener Current (IZM) | 115 mA @ 25°C - establishes absolute current limit before thermal runaway risk |
| Junction Temp Range | –65°C to +200°C - enables operation in automotive under-hood or industrial high-temp environments |
| Tolerance | ±5% - ensures predictable voltage setpoint without post-manufacture trimming |
Pinout & Package
DO-35 glass axial-leaded package with cathode indicated by color band; no polarity-sensitive terminals beyond anode/cathode distinction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node when used in forward bias; tied to ground or return path in reverse-bias regulation |
| Cathode | Zener breakdown terminal | Connected to regulated voltage node; marked by color band; carries controlled reverse current during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Stable 3.3 V reference | Guaranteed 3.1–3.5 V range at 5 mA enables reliable 3.3 V rail monitoring without external calibration |
| Low leakage current | 2 μA max at 1 V reverse bias minimizes quiescent power loss in battery-powered sensor interfaces |
| High temp capability | –65°C to +200°C operating range supports deployment in engine control units and downhole instrumentation |
| Standard DO-35 footprint | Enables drop-in replacement in legacy through-hole designs without PCB redesign or retooling |
| 5% voltage tolerance | Reduces need for binning or post-assembly adjustment in cost-sensitive consumer electronics |
Applications
| Overvoltage Protection in Sensor Front-Ends | Low-Power Voltage Reference for ADC Biasing |
|---|---|
Use Scenario: Protecting analog inputs of microcontrollers from ESD transients or supply rail overshoot in industrial temperature sensors. IC Role / Device Role / Timing Role: Zener clamping element placed between input pin and ground to shunt excess energy above 3.3 V. Use Value: Limits voltage excursion to ≤3.5 V with 2 μA leakage, preserving signal integrity while avoiding damage to 3.3 V-tolerant I/O cells. | Use Scenario: Providing stable bias voltage for precision analog-to-digital converter reference dividers in portable medical devices. IC Role / Device Role / Timing Role: Passive voltage reference source delivering fixed 3.3 V node for ratiometric measurement scaling. Use Value: Maintains ±5% accuracy across –40°C to +85°C ambient, enabling <1 LSB error in 12-bit ADC systems without active regulation. |
| Power Supply Rail Clamp in IoT Node PMUs | EEPROM Write-Voltage Stabilization |
Use Scenario: Clamping LDO output during startup surge or load dump events in battery-powered edge-node power management units. IC Role / Device Role / Timing Role: Shunt regulator absorbing transient current spikes on 3.3 V domain to prevent brownout resets. Use Value: Handles 115 mA peak current with 500 mW rating and 85 Ω impedance, limiting voltage rise to <0.1 V per 10 mA step change. | Use Scenario: Generating precise 3.3 V programming voltage for serial EEPROM write cycles in embedded controllers. IC Role / Device Role / Timing Role: Zener-based voltage source ensuring consistent VPP level independent of main supply fluctuations. Use Value: Delivers stable 3.3 V within ±5% across 1–5 mA load range, meeting JEDEC JESD8-12A specification for EEPROM VPP tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A | Same 3.3 V nominal, but ±5% tolerance and 1.0 Ω lower ZZ (84 Ω); DO-41 package (larger than DO-35) | Requires PCB pad revision due to longer body and 0.4" lead spacing vs. DO-35's 0.3" spacing | Select when higher surge current handling (1.0 W) is required and board space allows larger footprint |
| MMSZ4678 | Same 3.3 V, SOD-123 surface-mount package; 100 Ω ZZ at 5 mA; 5 μA IR at 1 V | Not compatible with through-hole assembly; requires reflow-compatible layout and solder process validation | Choose for space-constrained PCBs where automated SMT placement is preferred over manual through-hole insertion |
Compared with BZX55C3V3_T26A, the 1N4728A offers higher power rating but demands mechanical redesign, while MMSZ4678 enables miniaturization at the cost of increased leakage and incompatible mounting - making BZX55C3V3_T26A optimal for legacy DO-35-reliant designs needing proven thermal stability and low-leakage performance.
Availability
BZX55C3V3_T26A is available at Aetrix Electronics and suitable for industrial sensor interfaces, battery-powered IoT nodes, and automotive body-control modules requiring stable component supply with long-term obsolescence mitigation.
Supply support for BZX55C3V3_T26A 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, analog, and discrete components before its acquisition by ON Semiconductor in 2016.
The BZX55 series belongs to Fairchild's general-purpose Zener diode product line, designed specifically for cost-effective, thermally robust voltage regulation and transient suppression in through-hole consumer, industrial, and automotive electronics.
FAQ
What is the exact zener voltage range for BZX55C3V3_T26A at 25°C?
The BZX55C3V3_T26A has a guaranteed zener voltage range of 3.1 V to 3.5 V when measured at 5 mA test current and 25°C ambient, per the Fairchild BZX55C2V4–BZX55C56 datasheet Rev. D1. This 5% tolerance window reflects the device's nominal 3.3 V rating and applies under standardized thermal equilibrium conditions with 3/8″ lead length.
Does BZX55C3V3_T26A support operation above 100°C junction temperature?
Yes, BZX55C3V3_T26A is rated for junction and storage temperatures from –65°C to +200°C. Its electrical characteristics are specified at 25°C, but the wide thermal range allows use in high-temperature environments such as engine compartments or industrial motor drives, provided power derating (4.0 mW/°C above 75°C) is applied to maintain reliability.
What is the maximum reverse leakage current for BZX55C3V3_T26A?
The maximum reverse leakage current (IR) for BZX55C3V3_T26A is 2 μA at VR = 1 V and 25°C, as confirmed in the Fairchild datasheet. At elevated temperatures (e.g., 125°C), IR increases to 40 μA - a value critical for low-power sleep-mode design in battery-operated systems using BZX55C3V3_T26A as a reference or clamp.
Is BZX55C3V3_T26A compatible with lead-free reflow soldering processes?
BZX55C3V3_T26A uses a DO-35 glass package with axial leads and is intended for wave or hand-soldering. While not rated for standard Pb-free reflow profiles (peak ~260°C), it can withstand brief exposure up to 235°C for ≤10 seconds - sufficient for selective reflow of through-hole components if preheated and profile-controlled. Always verify thermal stress limits before full-process integration.
How does the dynamic impedance of BZX55C3V3_T26A affect voltage regulation accuracy?
The BZX55C3V3_T26A has a dynamic impedance (ZZ) of 85 Ω at 5 mA, meaning a 1 mA change in zener current causes approximately 85 mV shift in output voltage. This directly impacts regulation stability under varying load conditions - for example, in a 100 μA–5 mA bias network, output variation stays within ±0.4 V, making BZX55C3V3_T26A suitable for non-critical references but not ultra-precision applications.
BZX55C3V3_T26A 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):
- 3.3 V
- Tolerance:
- ±6%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 85 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 1 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
BZX55C3V3_T26A FAQ
1.How can I place an order for BZX55C3V3_T26A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX55C3V3_T26A 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 BZX55C3V3_T26A reliable?
The price and inventory of BZX55C3V3_T26A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX55C3V3_T26A is usually 5 days.
3.What payment methods are accepted for BZX55C3V3_T26A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX55C3V3_T26A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX55C3V3_T26A?
BZX55C3V3_T26A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX55C3V3_T26A 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 BZX55C3V3_T26A?
For technical support, including BZX55C3V3_T26A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX55C3V3_T26A requirements.
6.How does Aetrix verify that BZX55C3V3_T26A is sourced from the original manufacturer or authorized distributors?
All BZX55C3V3_T26A 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 BZX55C3V3_T26A meets industry standards.
7.What is the process for return or replacement of BZX55C3V3_T26A?
All BZX55C3V3_T26A units undergo pre-shipment inspection (PSI). If there is an issue with BZX55C3V3_T26A, 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 BZX55C3V3_T26A part is unused and in its original packaging.
Return procedure for BZX55C3V3_T26A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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