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onsemi 1N5221BTA
- Part No.:
- 1N5221BTA
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5221BTA.pdf
- Description:
- DIODE ZENER 2.4V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:5,837
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Product details
Overview
1N5221BTA from ON Semiconductor is a 2.4 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation and 20 mA test current, with 30 Ω dynamic impedance and -0.085 %/°C temperature coefficient - used for precision low-voltage reference and overvoltage protection in linear regulators and sensor biasing circuits.
For engineers reviewing the 1N5221BTA datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, cathode identification, and direct alternatives for voltage reference design, ESD clamp staging, and analog signal conditioning where tight tolerance and stable TC are required.
Technical Context
This device operates as a two-terminal silicon Zener diode with sharp reverse breakdown at nominal 2.4 V, designed for operation in the Zener region under controlled DC or low-frequency transient conditions. It exhibits a typical knee current (IZK) of 0.25 mA and maximum leakage (IR) of 100 μA at 1.0 V reverse bias.
The DO-35 hermetically sealed glass package enables reliable operation across -65°C to +200°C junction temperature range, with lead temperature rating of +230°C for soldering. Thermal derating begins above 50°C at 4.0 mW/°C, limiting usable power in high-ambient environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.4 V nominal at IZ = 20 mA - defines precise clamping/reference level in feedback networks and voltage references. |
| Tolerance | ±5% - ensures predictable VZ variation across production lots for calibration-critical analog stages. |
| Zener Impedance (ZZ) | 30 Ω max at IZ = 20 mA - determines output regulation error under load transients in shunt regulator topologies. |
| Temperature Coefficient (TC) | -0.085 %/°C - quantifies VZ drift per degree Celsius, critical for stability in wide-temperature industrial sensors. |
| Power Dissipation (PD) | 500 mW at TA = 25°C - sets maximum continuous DC power handling before thermal runaway or parameter shift. |
| Reverse Leakage (IR) | 100 μA max at VR = 1.0 V - limits standby current in low-power battery-backed circuits and affects noise floor in precision references. |
| Forward Voltage (VF) | 1.2 V max at IF = 200 mA - defines conduction loss when used bidirectionally or in series with other protection devices. |
Pinout & Package
DO-35 glass axial package with cathode identified by color band; two-terminal device with no internal polarity reversal - anode and cathode leads are unmarked except for cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal in forward bias; connected to lower-potential node in Zener operation | Must be held at least 0.7 V below cathode to avoid forward conduction during regulation. |
| Cathode | Negative terminal in forward bias; higher-potential node in Zener operation | Marked with colored band; connects to regulated voltage rail or reference node in shunt configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass sealing | Enables long-term reliability and moisture resistance in harsh environments without conformal coating. |
| Low Zener voltage drift | -0.085 %/°C TC supports <±2 mV/°C variation - suitable for 0–70°C industrial reference designs. |
| Precision ±5% tolerance | Reduces need for post-assembly trimming in voltage monitor thresholds and comparator hysteresis circuits. |
| Controlled knee current | IZK = 0.25 mA ensures stable turn-on behavior even in ultra-low-current bias networks. |
| Standard DO-35 footprint | Enables drop-in replacement in legacy through-hole PCBs and compatibility with automated axial insertion equipment. |
Applications
| Power Supply Reference | Sensor Biasing |
|---|---|
Use Scenario: Providing stable 2.4 V reference for op-amp-based voltage monitors in 5 V rail supervision circuits. IC Role / Device Role / Timing Role: Shunt voltage reference establishing threshold for comparator input. Use Value: ±5% VZ tolerance and low TC ensure consistent trip point across temperature without recalibration. |
Use Scenario: Biasing resistive temperature detector (RTD) bridges in HVAC control modules. IC Role / Device Role / Timing Role: Precision current source via series resistor + Zener voltage reference. Use Value: 30 Ω ZZ minimizes current variation under bridge loading, improving measurement linearity. |
| Overvoltage Clamp | ESD Protection Stage |
Use Scenario: Clamping microcontroller I/O pins against 3.3 V rail surges in industrial PLC input modules. IC Role / Device Role / Timing Role: Low-energy Zener clamp absorbing transient energy before IC damage. Use Value: 500 mW PD and fast response enable repeated 100 ns surge absorption without degradation. |
Use Scenario: First-stage protection on analog front-end inputs exposed to human-body-model (HBM) ESD events. IC Role / Device Role / Timing Role: Pre-regulator limiting voltage seen by downstream TVS or integrated ESD cell. Use Value: 100 μA IR at 1.0 V ensures negligible loading on high-impedance sensor signals during normal operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A | 3.3 V nominal, ±5%, 1.0 W PD, DO-41 package | Higher voltage and power rating; not interchangeable without circuit redesign. | Select when 3.3 V reference or higher surge energy handling is required. |
| BZX55C2V4 | 2.4 V nominal, ±5%, 500 mW PD, DO-35 package, 35 Ω ZZ | Nearly identical VZ and package; slightly higher impedance affects regulation accuracy under load. | Valid alternative if BZX55C2V4 sourcing is preferred; verify ZZ impact in high-precision feedback loops. |
Compared with 1N5221BTA, 1N4728A offers higher power and voltage but requires layout change due to DO-41 size, while BZX55C2V4 matches voltage and package but has 17% higher impedance - affecting regulation error in current-sensitive references.
Availability
1N5221BTA is available at Aetrix Electronics and suitable for power supply supervision, sensor biasing, overvoltage clamping, and ESD pre-protection requiring stable component supply and long-lifecycle support.
Supply support for 1N5221BTA 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
ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensor, and logic solutions for automotive, industrial, and consumer markets.
The 1N52xxB series belongs to ON Semiconductor's general-purpose Zener diode product line, engineered for cost-effective, reliable voltage regulation and reference in space-constrained through-hole applications.
FAQ
What is the nominal Zener voltage and tolerance of the 1N5221BTA?
The 1N5221BTA has a nominal Zener voltage of 2.4 V with a tolerance of ±5%, measured at 20 mA test current and 25°C ambient. This specification is confirmed in the ON Semiconductor datasheet Rev. 3 (December 2018), and applies across the full operating temperature range when derated appropriately.
Does the 1N5221BTA have a specified forward voltage?
Yes, the 1N5221BTA has a maximum forward voltage (VF) of 1.2 V at 200 mA forward current, as stated in the Absolute Maximum Ratings section of the official ON Semiconductor datasheet. This value is relevant when the device is used in forward-biased configurations or bidirectional protection schemes.
What is the Zener impedance (ZZ) of the 1N5221BTA and why does it matter?
The 1N5221BTA has a maximum Zener impedance (ZZ) of 30 Ω at 20 mA test current. This parameter directly impacts regulation accuracy: lower ZZ means smaller output voltage variation under changing load current - critical in shunt regulator and precision reference applications where stability is essential.
Can the 1N5221BTA be used in surface-mount designs?
No, the 1N5221BTA is packaged in the axial DO-35 glass case and is intended for through-hole mounting only. It lacks SMD-compatible terminals or land patterns. For surface-mount equivalents, consider ON Semiconductor's NZ9F2V4 or similar SOD-123 Zener diodes - but these are not pin-compatible replacements for the 1N5221BTA.
What is the temperature coefficient of the 1N5221BTA and how does it affect performance?
The 1N5221BTA has a temperature coefficient of -0.085 %/°C, meaning its Zener voltage decreases by approximately 2.04 mV per °C rise in junction temperature. This negative TC must be accounted for in high-accuracy reference designs operating across wide temperature ranges, especially above 50°C where thermal derating also applies.
1N5221BTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 2.4 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 100 µA @ 1 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-35
1N5221BTA FAQ
1.How can I place an order for 1N5221BTA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5221BTA 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 1N5221BTA reliable?
The price and inventory of 1N5221BTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5221BTA is usually 5 days.
3.What payment methods are accepted for 1N5221BTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5221BTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5221BTA?
1N5221BTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5221BTA 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 1N5221BTA?
For technical support, including 1N5221BTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5221BTA requirements.
6.How does Aetrix verify that 1N5221BTA is sourced from the original manufacturer or authorized distributors?
All 1N5221BTA 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 1N5221BTA meets industry standards.
7.What is the process for return or replacement of 1N5221BTA?
All 1N5221BTA units undergo pre-shipment inspection (PSI). If there is an issue with 1N5221BTA, 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 1N5221BTA part is unused and in its original packaging.
Return procedure for 1N5221BTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5221BTA Tags
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