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onsemi 1N5225BT
- Part No.:
- 1N5225BT
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5225BT.pdf
- Description:
- DIODE ZENER 3V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:2,334
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Product details
Overview
1N5225BT from ON Semiconductor is a 3.0 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation at 25°C, with 29 Ω dynamic impedance at 20 mA test current and -0.075 %/°C temperature coefficient. It provides precision voltage reference in low-power analog circuits such as sensor biasing and voltage regulation in portable instrumentation.
For engineers reviewing the 1N5225BT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, cathode identification, and direct alternatives for voltage reference design validation and BOM optimization.
Technical Context
The 1N5225BT operates as a two-terminal silicon Zener diode with reverse-biased breakdown regulation. Its nominal Zener voltage of 3.0 V is specified at IZ = 20 mA, with tight 5% tolerance and low TC of -0.075 %/°C - enabling stable reference performance across industrial temperature ranges (-65°C to +200°C).
It features a DO-35 hermetically sealed glass package with axial leads, cathode indicated by a color band, and absolute maximum ratings including 500 mW power dissipation (derated 4.0 mW/°C above 50°C) and 230°C lead soldering temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.0 V nominal at IZ = 20 mA - defines precise clamping/reference level in feedback or bias networks |
| Tolerance | ±5% - ensures predictable voltage accuracy without post-selection in production |
| Dynamic Impedance (ZZ) | 29 Ω at IZ = 20 mA - determines output regulation sensitivity to load current changes |
| Power Dissipation (PD) | 500 mW at TA = 25°C - sets maximum continuous power handling before thermal shutdown risk |
| Temperature Coefficient (TC) | -0.075 %/°C - indicates slight negative drift with temperature, critical for ambient-compensated references |
| Reverse Leakage (IR) | 50 μA max at VR = 1.0 V - defines minimum off-state current in high-impedance sensing paths |
Pinout & Package
DO-35 glass axial-leaded package with cathode identified by a single color band on the body; leads are unmarked anode/cathode terminals requiring orientation verification via band placement during PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground node | Connected to circuit ground or lower-potential node when used in shunt regulation |
| Cathode | Zener breakdown terminal / voltage reference output | Connected to input supply or regulated node; color band identifies this terminal physically |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass sealing | Ensures long-term parameter stability and moisture resistance in harsh environments |
| Low temperature coefficient | -0.075 %/°C enables <10 mV drift over -40°C to +85°C ambient range |
| 5% voltage tolerance | Eliminates need for external trimming in cost-sensitive consumer and industrial references |
| DO-35 mechanical standardization | Guarantees compatibility with automated axial insertion equipment and legacy board designs |
Applications
| Portable Sensor Biasing | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Providing stable 3.0 V bias to analog output sensors (e.g., thermistors, RTDs) in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Shunt voltage reference establishing fixed bias point independent of supply variation. Use Value: Maintains sensor linearity and ADC accuracy despite Li-ion battery discharge from 3.6 V to 2.8 V. | Use Scenario: Generating clean reset threshold for 3.3 V microcontrollers during brown-out conditions. IC Role / Device Role / Timing Role: Zener-based voltage monitor triggering external reset IC or internal POR logic. Use Value: Ensures deterministic reset assertion at ≤3.05 V with <50 μA leakage minimizing quiescent current. |
| Low-Power Voltage Reference | Overvoltage Clamp Protection |
Use Scenario: Supplying reference voltage to op-amp comparators in energy-harvesting systems. IC Role / Device Role / Timing Role: Precision DC reference source for comparator hysteresis or threshold setting. Use Value: Delivers 3.0 V ±0.15 V accuracy with <30 Ω output impedance, reducing gain error in feedback loops. | Use Scenario: Protecting 3.3 V I/O pins from transient surges in industrial control interfaces. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting voltage excursions above 3.15 V. Use Value: Responds within nanoseconds to ESD events while dissipating ≤500 mW peak energy per pulse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5225B | Same electrical specs and DO-35 package; differs only in marking format (no 'T' suffix) | No functional difference; 'T' denotes tape-and-reel packaging variant | Select 1N5225B for bulk or tube delivery; 1N5225BT for automated SMT assembly feeders |
| BZX55-C3V0 | 3.0 V ±5%, 500 mW, but in DO-35 with different ZZ (30 Ω vs. 29 Ω) and TC (-0.07 %/°C) | Identical use cases; minor TC variance yields ~0.5 mV extra drift over 100°C range | Choose BZX55-C3V0 if sourcing from NXP or legacy BOMs; verify TC impact in wide-temp designs |
Compared with 1N5225B and BZX55-C3V0, the 1N5225BT offers identical regulation performance with optimized packaging for pick-and-place, while its -0.075 %/°C TC provides marginally tighter thermal stability than BZX55-C3V0 in precision analog stages.
Availability
1N5225BT is available at Aetrix Electronics and suitable for portable sensor biasing, microcontroller reset circuits, low-power voltage references, and overvoltage clamp protection requiring stable component supply and consistent Zener voltage accuracy.
Supply support for 1N5225BT 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 energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT applications.
The 1N5225BT belongs to the 1N52xxB Zener diode family designed for general-purpose voltage regulation and reference applications where reliability, tight tolerance, and standardized DO-35 packaging are essential.
FAQ
What is the Zener voltage tolerance of the 1N5225BT?
The 1N5225BT has a Zener voltage tolerance of ±5% around its nominal 3.0 V rating, meaning the actual measured VZ falls between 2.85 V and 3.15 V at IZ = 20 mA and TA = 25°C. This tolerance is guaranteed per ON Semiconductor's 1N5221B–1N5263B datasheet Rev. 3, and applies to all units regardless of packaging format including the 1N5225BT tape-and-reel variant.
Does the 1N5225BT have a specified forward voltage?
Yes, the 1N5225BT specifies a maximum forward voltage (VF) of 1.2 V at forward current IF = 200 mA, per the "Electrical Characteristics" table in the official ON Semiconductor datasheet. This value is relevant for reverse-polarity protection or dual-use as a rectifier in low-current paths, though the device is optimized for Zener operation in reverse bias.
What is the thermal derating behavior of the 1N5225BT above 50°C?
The 1N5225BT must be derated linearly at 4.0 mW/°C above 50°C ambient temperature, reducing its maximum allowable power dissipation from 500 mW at 25°C to 400 mW at 75°C. This derating ensures junction temperature remains within the -65°C to +200°C operating range and prevents parametric shift or premature failure under sustained thermal stress.
How is the cathode identified on the 1N5225BT package?
The cathode of the 1N5225BT is marked by a single color band on the DO-35 glass body, consistent with JEDEC DO-204AH standards. This band must be oriented toward the higher-potential node in shunt regulator configurations; the unmarked end is the anode. The marking is visible under magnification and confirmed in ON Semiconductor's top-mark information diagrams for the 1N5225B series.
Is the 1N5225BT RoHS compliant and halogen-free?
Yes, the 1N5225BT meets RoHS Directive 2011/65/EU requirements and is halogen-free per ON Semiconductor's material declarations. Compliance is documented in the company's environmental compliance reports accessible via www.onsemi.com, and applies to all manufacturing lots of the 1N5225BT regardless of date code or packaging format.
1N5225BT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 3 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 29 Ohms
- Current - Reverse Leakage @ Vr:
- 50 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
1N5225BT FAQ
1.How can I place an order for 1N5225BT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5225BT 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 1N5225BT reliable?
The price and inventory of 1N5225BT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5225BT is usually 5 days.
3.What payment methods are accepted for 1N5225BT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5225BT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5225BT?
1N5225BT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5225BT 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 1N5225BT?
For technical support, including 1N5225BT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5225BT requirements.
6.How does Aetrix verify that 1N5225BT is sourced from the original manufacturer or authorized distributors?
All 1N5225BT 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 1N5225BT meets industry standards.
7.What is the process for return or replacement of 1N5225BT?
All 1N5225BT units undergo pre-shipment inspection (PSI). If there is an issue with 1N5225BT, 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 1N5225BT part is unused and in its original packaging.
Return procedure for 1N5225BT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5225BT Tags
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