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onsemi 1N5254BTR
- Part No.:
- 1N5254BTR
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5254BTR.pdf
- Description:
- DIODE ZENER 27V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:2
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Product details
Overview
1N5254BTR from onsemi is a 27 V ±5% axial-lead Zener diode in DO-204AH (Case 017AG) glass package, rated for 500 mW power dissipation, 25 Ω maximum dynamic impedance at 10 mA, and 0.1 μA maximum reverse leakage at 20.3 V, used for precision voltage regulation in low-power analog reference circuits.
For engineers reviewing the 1N5254BTR datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, temperature coefficient (+0.089 %/°C), thermal resistance (250 °C/W), junction-to-lead thermal path, and Pb-free halide-free compliance per JEDEC DO-204AH.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable DC voltage under varying load and line conditions. It features a hermetically sealed glass package with 250 °C/W junction-to-lead thermal resistance and is characterized at 25 °C with 10 mA test current and 30 °C lead temperature.
The device exhibits a positive temperature coefficient of +0.089 %/°C, indicating increasing zener voltage with rising temperature, and supports non-recurrent pulse operation up to 8.3 ms at 50 °C ambient, with derating starting above 50 °C at 4.0 mW/°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 25.65 V min / 27.0 V typ / 28.35 V max @ IZ = 10 mA - defines regulated output voltage range under nominal bias |
| Dynamic Impedance (ZZ) | 25 Ω max @ IZ = 10 mA - determines output voltage stability against load current changes |
| Reverse Leakage (IR) | 0.1 μA max @ VR = 20.3 V - ensures minimal quiescent current in standby regulation |
| Power Dissipation (PD) | 500 mW @ TA = 25 °C - sets maximum continuous DC power handling before thermal derating |
| Temperature Coefficient (TC) | +0.089 %/°C - quantifies zener voltage drift per degree Celsius rise in junction temperature |
| Junction Temperature Range | −65 °C to +200 °C - enables operation in extended industrial and automotive under-hood environments |
Pinout & Package
DO-204AH (Case 017AG) axial-lead hermetically sealed glass package, 4.56 mm body length × 1.91 mm diameter, 0.137 g mass, JEDEC-compliant, Pb-free/halide-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode Band End) | Forward conduction terminal | Connected to lower-potential node in reverse-bias regulation configuration |
| Cathode (Banded End) | Zener breakdown terminal | Connected to higher-potential node; voltage referenced to this terminal during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage reference | ±5% VZ tolerance ensures tight regulation without external trimming in fixed-supply designs |
| Low thermal resistance | 250 °C/W junction-to-lead enables reliable 500 mW operation with minimal heatsinking |
| Stable temperature behavior | +0.089 %/°C TC allows predictable drift compensation in temperature-critical references |
| Hermetic glass construction | DO-204AH package provides long-term reliability and moisture resistance in harsh environments |
Applications
| Voltage Reference for ADC/DAC | Overvoltage Clamp in Sensor Interface |
|---|---|
Use Scenario: Provides stable 27 V reference for 16-bit SAR ADCs requiring <0.05% full-scale error. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to fix reference node potential. Use Value: 25 Ω ZZ and ±5% VZ tolerance directly support <1 LSB error across temperature in precision data acquisition. | Use Scenario: Clamps transient surges on 24 V industrial sensor supply lines to protect downstream op-amps. IC Role / Device Role / Timing Role: Standby shunt regulator that conducts only during overvoltage events >28.35 V. Use Value: 0.1 μA IR at 20.3 V ensures no loading of normal 24 V rail; fast response prevents latch-up in protected ICs. |
| Low-Power Bias Generator | Microcontroller Reset Threshold |
Use Scenario: Generates clean 27 V bias for high-voltage op-amp stages in battery-powered instrumentation. IC Role / Device Role / Timing Role: Passive voltage source delivering regulated DC with no active control circuitry. Use Value: 500 mW rating supports up to 18.5 mA continuous output while maintaining <1% regulation error. | Use Scenario: Sets precise 27 V reset threshold for microcontrollers monitoring 24 V system rails. IC Role / Device Role / Timing Role: Zener-based comparator input reference enabling deterministic brown-out detection. Use Value: +0.089 %/°C TC allows accurate reset point tracking across −40 °C to +125 °C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5254B | Bulk packaging (no tape/reel); identical electrical specs and DO-204AH package | No automated pick-and-place support; suitable for prototyping or low-volume hand assembly | Select 1N5254BTR for SMT production; choose 1N5254B for lab evaluation or small-batch builds |
| BZX55-C27 | ±5% VZ, 500 mW, but DO-35 package (smaller glass body, 2.5 mm diameter), 300 °C/W thermal resistance | Higher thermal impedance limits sustained power delivery; less robust mechanical mounting than DO-204AH | Prefer 1N5254BTR where board space permits and thermal performance is critical; BZX55-C27 fits tighter layouts |
Compared with 1N5254B and BZX55-C27, the 1N5254BTR offers tape-and-reel compatibility for automated assembly and superior thermal management via its larger DO-204AH case, making it optimal for volume production of industrial power monitors and sensor signal conditioners.
Availability
1N5254BTR is available at Aetrix Electronics and suitable for voltage reference design, overvoltage protection, low-power bias generation, and microcontroller reset supervision requiring stable component supply and full traceability.
Supply support for 1N5254BTR 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
onsemi (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The 1N52xxB series belongs to onsemi's legacy Zener diode product line engineered for precision DC voltage regulation in cost-sensitive, high-reliability analog circuits across industrial and consumer systems.
FAQ
What is the nominal zener voltage and tolerance of the 1N5254BTR?
The 1N5254BTR has a nominal zener voltage of 27.0 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 25.65 V and 28.35 V when tested at 10 mA and 25 °C. This tolerance is specified in the onsemi datasheet and applies to every unit shipped, ensuring consistent performance in voltage reference and clamping applications without calibration.
Does the 1N5254BTR have a positive or negative temperature coefficient?
Yes, the 1N5254BTR has a positive temperature coefficient of +0.089 %/°C, meaning its zener voltage increases linearly with rising junction temperature. This value is measured and guaranteed per the onsemi datasheet and must be accounted for in temperature-critical reference designs, especially those operating beyond 25 °C ambient.
What is the maximum reverse leakage current for the 1N5254BTR?
The maximum reverse leakage current for the 1N5254BTR is 0.1 μA at a reverse voltage of 20.3 V and 25 °C ambient. This ultra-low leakage ensures minimal parasitic loading on sensitive analog nodes and supports high-impedance reference applications where current draw must be strictly limited.
Is the 1N5254BTR compatible with automated SMT assembly processes?
Yes, the 1N5254BTR is supplied in tape-and-reel packaging (5000 units per reel), fully compatible with standard pick-and-place equipment. Its DO-204AH axial-lead form factor requires appropriate feeder setup, but the reel format enables high-yield, repeatable placement in volume manufacturing of industrial control modules and sensor interface boards.
What is the thermal resistance from junction to lead for the 1N5254BTR?
The junction-to-lead thermal resistance (RθJL) for the 1N5254BTR is 250 °C/W, as specified in the onsemi datasheet. This value reflects the thermal path through the DO-204AH glass package and leads, and is critical for calculating safe operating temperature margins when dissipating up to 500 mW in continuous DC operation.
1N5254BTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 41 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 21 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
1N5254BTR FAQ
1.How can I place an order for 1N5254BTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5254BTR 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 1N5254BTR reliable?
The price and inventory of 1N5254BTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5254BTR is usually 5 days.
3.What payment methods are accepted for 1N5254BTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5254BTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5254BTR?
1N5254BTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5254BTR 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 1N5254BTR?
For technical support, including 1N5254BTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5254BTR requirements.
6.How does Aetrix verify that 1N5254BTR is sourced from the original manufacturer or authorized distributors?
All 1N5254BTR 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 1N5254BTR meets industry standards.
7.What is the process for return or replacement of 1N5254BTR?
All 1N5254BTR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5254BTR, 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 1N5254BTR part is unused and in its original packaging.
Return procedure for 1N5254BTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5254BTR Tags
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