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onsemi 1N5231B_T26A
- Part No.:
- 1N5231B_T26A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5231B_T26A.pdf
- Description:
- DIODE ZENER 5.1V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:3,283
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Product details
Overview
1N5231B_T26A from ON Semiconductor is a 5.1 V ±5% tolerance, 500 mW glass-passivated Zener diode in DO-35 package, designed for precision voltage regulation and reference applications at 20 mA test current, with 17 Ω dynamic impedance and ±0.03 %/°C temperature coefficient.
For engineers reviewing the 1N5231B_T26A datasheet, pinout, applications, or equivalent options, this part serves as a low-power, stable voltage reference in analog signal conditioning, power supply feedback loops, and overvoltage protection circuits where tight tolerance and low TC are critical.
Technical Context
The 1N5231B_T26A operates as a reverse-biased Zener diode with a nominal breakdown voltage of 5.1 V at IZ = 20 mA, meeting JEDEC DO-204AH (DO-35) mechanical standards. Its glass-hermetic package ensures long-term stability and moisture resistance in industrial environments.
It exhibits a low 17 Ω Zener impedance (ZZ) at 20 mA and a tight ±0.03 %/°C temperature coefficient (TC), enabling predictable regulation across -65°C to +200°C junction temperature range without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1 V nominal at IZ = 20 mA - defines precise regulation point for feedback and reference circuits |
| Tolerance | ±5% - ensures voltage accuracy within 4.845 V to 5.355 V at 25°C |
| Zener Impedance (ZZ) | 17 Ω max at IZ = 20 mA - minimizes output voltage variation under load changes |
| Temperature Coefficient (TC) | ±0.03 %/°C - enables stable reference performance across wide ambient ranges |
| Power Dissipation (PD) | 500 mW at TA = 25°C - supports continuous operation in compact PCB layouts |
| Reverse Leakage (IR) | 5.0 μA max at VR = 3.0 V - ensures low quiescent current in standby mode |
| Package | DO-35 glass axial - hermetically sealed, RoHS-compliant, industry-standard footprint |
Pinout & Package
DO-35 glass axial package with cathode band marking; two-terminal device requiring no orientation-specific PCB layout beyond standard anode/cathode polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node in shunt regulator configuration |
| Cathode | Zener breakdown terminal / voltage reference output | Connected to regulated node; voltage develops across cathode-to-anode when reverse biased ≥ VZ |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage | 5.1 V ±5% with guaranteed min/max bounds - eliminates need for post-production trimming in cost-sensitive designs |
| Low dynamic impedance | 17 Ω at 20 mA - maintains <10 mV output shift under ±5 mA load transients |
| Stable temperature coefficient | ±0.03 %/°C - reduces drift to <±1.5 mV/°C near room temperature |
| Hermetic glass package | DO-35 per JEDEC DO-204AH - ensures >10-year parametric stability in humid or thermally cycled environments |
Applications
| Power Supply Feedback | Analog Sensor Reference |
|---|---|
Use Scenario: Regulating output voltage in linear regulators and switching converter feedback networks. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 5.1 V setpoint to error amplifier inputs. Use Value: Enables ±1% output regulation accuracy without trimming, leveraging tight 5.1 V tolerance and low ZZ. | Use Scenario: Providing excitation voltage for resistive bridge sensors (e.g., strain gauges, RTDs). IC Role / Device Role / Timing Role: Precision analog reference source for ADC biasing and ratiometric measurement systems. Use Value: Delivers stable 5.1 V with ±0.03 %/°C TC, minimizing sensor offset drift across operating temperature. |
| Overvoltage Clamp | Microcontroller Reset Circuit |
Use Scenario: Protecting I/O pins and analog inputs from transient overvoltage events. IC Role / Device Role / Timing Role: Low-energy clamping element diverting surge current above 5.1 V to ground. Use Value: Responds within nanoseconds with 500 mW surge rating, limiting voltage to safe levels below IC absolute maximum ratings. | Use Scenario: Generating clean reset signals during power-up and brownout conditions. IC Role / Device Role / Timing Role: Threshold detector triggering reset logic when supply falls below 5.1 V. Use Value: Provides deterministic 5.1 V trip point with low leakage (<5 μA), ensuring reliable reset assertion without external hysteresis components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A | 5.1 V, 1 W, DO-41 package, 17 Ω ZZ, ±5% tolerance, but higher 100°C max TJ | Higher power handling supports larger surge currents but requires larger PCB footprint | Select when >500 mW dissipation or higher thermal margin is required |
| BZX55C5V1 | 5.1 V, 500 mW, DO-35, ±5% tolerance, 60 Ω ZZ, ±0.05 %/°C TC | Higher impedance and looser TC reduce regulation accuracy in precision references | Select for cost-sensitive non-critical biasing where tighter specs are not required |
Compared with 1N4733A and BZX55C5V1, the 1N5231B_T26A delivers superior thermal stability (±0.03 %/°C) and identical ZZ in a smaller DO-35 package, making it optimal for space-constrained, high-accuracy voltage reference designs.
Availability
1N5231B_T26A is available at Aetrix Electronics and suitable for power supply feedback, analog sensor reference, overvoltage clamp, and microcontroller reset circuits requiring stable component supply and long-term parametric consistency.
Supply support for 1N5231B_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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1N52xxB series is part of ON Semiconductor's legacy Zener diode portfolio, engineered for high-reliability voltage reference and regulation in cost-sensitive, space-constrained applications.
FAQ
What is the nominal Zener voltage and test current for the 1N5231B_T26A?
The 1N5231B_T26A has a nominal Zener voltage of 5.1 V measured at a test current (IZ) of 20 mA. This value is guaranteed within a 4.845 V to 5.355 V range at 25°C, per its ±5% tolerance specification. The 1N5231B_T26A achieves stable regulation only when operated within its specified IZ range and power limits.
Does the 1N5231B_T26A have a defined cathode marking, and how is polarity identified?
Yes, the 1N5231B_T26A uses a color band on the DO-35 glass body to denote the cathode terminal, consistent with JEDEC DO-204AH standards. The banded end is the cathode; the unmarked end is the anode. This marking is visible under standard visual inspection and must be observed during PCB placement to ensure correct reverse-bias operation of the 1N5231B_T26A.
What is the maximum power dissipation and derating behavior of the 1N5231B_T26A?
The 1N5231B_T26A has a maximum power dissipation of 500 mW at 25°C ambient temperature. It derates linearly at 4.0 mW/°C above 50°C ambient, meaning usable power drops to 400 mW at 75°C and 300 mW at 100°C. This derating must be applied in thermal design to prevent junction overheating and ensure reliability of the 1N5231B_T26A.
How does the temperature coefficient of the 1N5231B_T26A affect its regulation accuracy?
The 1N5231B_T26A has a temperature coefficient of ±0.03 %/°C, meaning its Zener voltage shifts by approximately ±1.53 mV per °C change near 25°C. Over a 100°C range, this results in ≤±153 mV total drift - significantly less than alternatives with looser TC. This stability makes the 1N5231B_T26A suitable for applications demanding minimal thermal-induced error.
Is the 1N5231B_T26A RoHS compliant and halogen-free?
Yes, the 1N5231B_T26A is RoHS compliant and halogen-free, as confirmed by ON Semiconductor's material declarations and packaging specifications. Its DO-35 glass package contains no lead in solderable terminations and meets EU Directive 2011/65/EU requirements. This compliance applies to the 1N5231B_T26A as shipped and supports environmentally regulated electronics manufacturing.
1N5231B_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):
- 5.1 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 2 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
1N5231B_T26A FAQ
1.How can I place an order for 1N5231B_T26A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5231B_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 1N5231B_T26A reliable?
The price and inventory of 1N5231B_T26A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5231B_T26A is usually 5 days.
3.What payment methods are accepted for 1N5231B_T26A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5231B_T26A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5231B_T26A?
1N5231B_T26A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5231B_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 1N5231B_T26A?
For technical support, including 1N5231B_T26A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5231B_T26A requirements.
6.How does Aetrix verify that 1N5231B_T26A is sourced from the original manufacturer or authorized distributors?
All 1N5231B_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 1N5231B_T26A meets industry standards.
7.What is the process for return or replacement of 1N5231B_T26A?
All 1N5231B_T26A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5231B_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 1N5231B_T26A part is unused and in its original packaging.
Return procedure for 1N5231B_T26A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5231B_T26A Tags
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