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onsemi BZX55C16_T26A
- Part No.:
- BZX55C16_T26A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX55C16_T26A.pdf
- Description:
- DIODE ZENER 16V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:5,976
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Product details
Overview
BZX55C16_T26A from Fairchild Semiconductor is a 16 V ±5% tolerance silicon Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C, with 40 Ω dynamic impedance at 5 mA test current and 0.1 μA maximum reverse leakage at 12.8 V. It provides precise voltage regulation in low-power reference and protection circuits.
For engineers reviewing the BZX55C16_T26A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal derating behavior, cathode identification via color band, and compatibility with through-hole PCB layouts requiring stable 16 V clamping.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in a planar-diffused silicon junction. Its 16 V nominal zener voltage is specified at 5 mA test current with ±5% tolerance, and it maintains regulation across -65°C to +200°C operating temperature range.
The DO-35 glass package features axial leads with cathode indicated by a color band, and thermal performance follows a 4.0 mW/°C derating above 75°C ambient lead temperature - critical for reliability in compact or thermally constrained designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 15.3 V min / 17.1 V max at IZ = 5 mA - defines usable regulation window for 16 V reference design |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous power before thermal derating begins |
| Dynamic Impedance (ZZ) | 40 Ω @ IZ = 5 mA - indicates voltage stability under small-signal load variation |
| Reverse Leakage (IR) | 0.1 μA max @ VR = 12.8 V - ensures minimal quiescent current in standby protection mode |
| Max Zener Current (IZM) | 12 mA - derived from PD and VZ, limits peak surge handling capability |
| Operating Temp Range | -65°C to +200°C - supports deployment in automotive under-hood or industrial high-temp environments |
Pinout & Package
DO-35 glass axial-leaded package with cathode identified by a single color band on the body. Leads are tinned copper-clad steel, suitable for wave or hand soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased regulation configuration |
| Cathode | Zener breakdown terminal | Marked with color band; connected to higher-potential node to enable controlled avalanche conduction |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable 16 V reference without post-production trimming in cost-sensitive applications |
| Low reverse leakage (0.1 μA) | Minimizes standby power loss in battery-backed or energy-harvesting systems |
| DO-35 glass package | Provides hermetic sealing and proven long-term stability for industrial-grade reliability |
| 4.0 mW/°C thermal derating | Allows accurate power budgeting in elevated ambient temperature environments up to +200°C |
Applications
| Overvoltage Protection | Low-Power Reference |
|---|---|
Use Scenario: Clamping transient spikes on 15 V logic supply rails in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Voltage clamp protecting downstream CMOS inputs from ESD or inductive kickback. Use Value: Limits rail excursion to ≤17.1 V during transients while drawing <12 mA peak current. | Use Scenario: Providing stable bias voltage for op-amp comparators in sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Precision DC reference source with minimal temperature drift over -40°C to +85°C. Use Value: Delivers 16 V ±0.85 V across full operating temperature range with <40 Ω output impedance. |
| Power Supply Feedback | Signal Level Shifting |
Use Scenario: Setting regulated output voltage in discrete linear regulator feedback networks. IC Role / Device Role / Timing Role: Error amplifier reference node in adjustable 78xx-style regulators. Use Value: Enables accurate 16 V output setting with <5% initial tolerance and stable ZZ under load variation. | Use Scenario: Biasing analog front-end stages in mixed-signal data acquisition boards. IC Role / Device Role / Timing Role: DC level translator establishing common-mode offset for ADC input drivers. Use Value: Provides repeatable 16 V offset with <0.1 μA leakage, minimizing input bias error in precision measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A | 12 V nominal, 1 W rating, DO-41 package, 22 Ω ZZ | Higher power handling but lower voltage; requires layout change due to larger DO-41 footprint | Select when 12 V regulation and >500 mW surge capability are required |
| MMSZ4687 | 16 V nominal, SOD-123 surface-mount package, 350 mW rating, 40 Ω ZZ | Same VZ tolerance and ZZ, but not pin-compatible - requires rework for automated assembly | Select for space-constrained PCBs where DO-35 axial leads are impractical |
Compared with 1N4742A and MMSZ4687, BZX55C16_T26A offers the only DO-35 through-hole solution at 16 V with 500 mW rating and 40 Ω impedance - making it optimal for legacy industrial designs requiring serviceability and thermal robustness without board redesign.
Availability
BZX55C16_T26A is available at Aetrix Electronics and suitable for overvoltage protection, low-power reference, and power supply feedback applications requiring stable component supply and long-lifecycle support.
Supply support for BZX55C16_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, signal conditioning, and discrete components before its acquisition by ON Semiconductor in 2016.
The BZX55 series was developed for general-purpose voltage regulation and transient suppression in cost-sensitive industrial and consumer electronics, emphasizing reliability in DO-35 packaging and tight parametric control.
FAQ
What is the exact zener voltage range for BZX55C16_T26A at 25°C?
The BZX55C16_T26A has a guaranteed zener voltage range of 15.3 V to 17.1 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. The BZX55C16_T26A maintains this specification across its qualified operating temperature range.
Does BZX55C16_T26A support operation above 75°C ambient?
Yes, BZX55C16_T26A is rated for operation from -65°C to +200°C junction temperature. Power dissipation must be derated linearly at 4.0 mW/°C above 75°C lead temperature. For example, at 100°C lead temperature, maximum allowable power drops to 400 mW. The BZX55C16_T26A's DO-35 glass package ensures stable performance under these thermal conditions.
How is cathode polarity identified on BZX55C16_T26A?
The cathode of BZX55C16_T26A is marked by a single color band on the DO-35 glass body - consistent with industry-standard axial diode marking. When installed, the banded end connects to the higher-potential node in reverse-bias regulation mode. This marking is verified per Fairchild's top-marking specification and applies identically across all BZX55Cxx variants including BZX55C16_T26A.
What is the maximum reverse leakage current for BZX55C16_T26A?
BZX55C16_T26A exhibits a maximum reverse leakage current of 0.1 μA at 12.8 V reverse voltage and 25°C. This value is confirmed in the Electrical Characteristics table of the official Fairchild datasheet Rev. D1. At elevated temperatures (e.g., 125°C), leakage remains below 2 μA - a critical parameter for low-power and battery-operated systems using BZX55C16_T26A.
Can BZX55C16_T26A replace BZX55C15 or BZX55C18 in existing designs?
BZX55C16_T26A is not a direct replacement for BZX55C15 (15 V) or BZX55C18 (18 V) due to different nominal zener voltages and non-overlapping voltage ranges. While all share identical DO-35 packaging and thermal specs, substituting BZX55C16_T26A would shift regulation points by ±1–2 V. System-level validation is required before interchange. The BZX55C16_T26A must be selected specifically for 16 V target applications.
BZX55C16_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):
- 16 V
- Tolerance:
- ±6%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 40 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 12 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
BZX55C16_T26A FAQ
1.How can I place an order for BZX55C16_T26A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX55C16_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 BZX55C16_T26A reliable?
The price and inventory of BZX55C16_T26A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX55C16_T26A is usually 5 days.
3.What payment methods are accepted for BZX55C16_T26A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX55C16_T26A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX55C16_T26A?
BZX55C16_T26A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX55C16_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 BZX55C16_T26A?
For technical support, including BZX55C16_T26A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX55C16_T26A requirements.
6.How does Aetrix verify that BZX55C16_T26A is sourced from the original manufacturer or authorized distributors?
All BZX55C16_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 BZX55C16_T26A meets industry standards.
7.What is the process for return or replacement of BZX55C16_T26A?
All BZX55C16_T26A units undergo pre-shipment inspection (PSI). If there is an issue with BZX55C16_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 BZX55C16_T26A part is unused and in its original packaging.
Return procedure for BZX55C16_T26A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX55C16_T26A Tags
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