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onsemi 1N5231B_NT50A
- Part No.:
- 1N5231B_NT50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5231B_NT50A.pdf
- Description:
- DIODE ZENER 5.1V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:9,842
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Product details
Overview
1N5231B_NT50A from ON Semiconductor is a 5.1 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation, 17 Ω dynamic impedance at 20 mA test current, and 5.0 μA maximum reverse leakage at 3.8 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog circuits, power supply feedback loops, and sensor biasing networks.
For engineers reviewing the 1N5231B_NT50A datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, cathode identification, and direct alternatives with documented Zener voltage tolerance, impedance, and leakage differences.
Technical Context
This device operates as a silicon planar Zener diode with controlled avalanche breakdown at nominal 5.1 V. Its temperature coefficient of ±0.03 %/°C ensures stable regulation across -65°C to +200°C junction range, and its 17 Ω dynamic impedance at IZ = 20 mA supports tight voltage control under moderate load variation.
The DO-35 hermetically sealed glass package provides mechanical robustness and reliable thermal conduction via axial leads. Cathode identification is marked by a single color band on the glass body, and forward voltage is specified at ≤1.2 V @ 200 mA - confirming standard PN junction behavior outside Zener operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1 V nominal, ±5% tolerance - defines precise clamping/reference level in feedback or protection circuits |
| Test Current (IZ) | 20 mA - standard operating point for VZ and ZZ specification; design must sustain this current for rated performance |
| Dynamic Impedance (ZZ) | 17 Ω @ 20 mA - determines output voltage deviation under load transients; lower value improves regulation accuracy |
| Power Dissipation (PD) | 500 mW @ TA = 25°C, derated 4.0 mW/°C above 50°C - sets maximum continuous power handling in PCB layout |
| Reverse Leakage (IR) | 5.0 μA max @ VR = 3.8 V - limits error current in high-impedance reference nodes or battery-powered standby circuits |
| Temperature Coefficient | ±0.03 %/°C - quantifies VZ drift per degree; enables prediction of regulation shift over ambient or self-heating conditions |
| Forward Voltage (VF) | ≤1.2 V @ IF = 200 mA - confirms diode functionality in series protection or polarity-sensitive configurations |
Pinout & Package
1N5231B_NT50A uses the JEDEC DO-35 axial-lead glass package (hermetically sealed), with total length ≥25.4 mm and body diameter 1.91 mm. Cathode is identified by a single color band near one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | PN junction P-side | Connected to lower-potential node in reverse-bias Zener operation; carries forward current when biased conductively |
| Cathode | PN junction N-side | Marked by color band; connected to higher-potential node during Zener regulation; defines reference voltage node |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage | 5.1 V ±5% - enables accurate voltage setting without trimming in cost-sensitive analog designs |
| Low dynamic impedance | 17 Ω @ 20 mA - minimizes output voltage variation under changing load currents in regulator shunt paths |
| Stable temperature coefficient | ±0.03 %/°C - reduces thermal drift in environments with >30°C ambient swing or self-heating |
| Hermetic DO-35 package | JEDEC-compliant glass enclosure - ensures long-term reliability in humid or chemically aggressive industrial enclosures |
| Controlled reverse leakage | 5.0 μA max @ 3.8 V - preserves signal integrity in high-impedance sensor interfaces and micropower monitoring circuits |
Applications
| Power Supply Feedback | Sensor Bias Reference |
|---|---|
Use Scenario: Shunt-regulated feedback path in isolated flyback or buck-derived auxiliary supplies. IC Role / Device Role / Timing Role: Zener diode provides stable 5.1 V reference to optocoupler input or TL431 cathode. Use Value: Enables ±1% output voltage accuracy without secondary-side controller, leveraging 5.1 V ±5% tolerance and low ZZ. |
Use Scenario: Fixed bias voltage for analog temperature or pressure sensors in automotive cabin modules. IC Role / Device Role / Timing Role: Supplies regulated excitation to bridge-based sensors where ratiometric ADCs require stable reference. Use Value: Delivers <5 μA leakage and ±0.03 %/°C TC to maintain sensor offset stability across -40°C to +125°C. |
| Overvoltage Clamp | Microcontroller Reset Circuit |
Use Scenario: Protection of 5 V logic inputs against transient surges in industrial I/O modules. IC Role / Device Role / Timing Role: Clamps induced spikes to ≤5.1 V + ISPK × ZZ, diverting energy to ground. Use Value: 500 mW rating and 17 Ω ZZ limit clamped voltage to <6.5 V under 80 mA surge (per 8.3 ms pulse spec). |
Use Scenario: Brown-out detection and clean reset assertion for 5 V microcontrollers in battery-backed systems. IC Role / Device Role / Timing Role: Forms threshold detector with resistor divider and comparator; holds reset until VCC exceeds 4.75 V. Use Value: Tight 5.1 V tolerance and low TC ensure consistent reset threshold across temperature and unit-to-unit variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5231B (ON Semi) | Same Zener voltage (5.1 V), identical DO-35 package, but no "_NT50A" suffix - reflects legacy Fairchild nomenclature prior to ON Semi integration | No functional difference; NT50A denotes updated ordering code post-integration; same electrical specs and marking | Select 1N5231B_NT50A for new designs requiring traceability to current ON Semi system; use 1N5231B only if sourcing legacy stock |
| BZX55-C5V1 (Vishay) | 5.1 V ±5%, 500 mW, DO-35, but ZZ = 20 Ω @ 5 mA (vs. 17 Ω @ 20 mA) and IR = 10 μA @ 3.8 V (vs. 5 μA) | Higher impedance and leakage reduce regulation accuracy in precision feedback or low-power biasing | Acceptable for non-critical clamping; avoid where <5 μA leakage or sub-20 Ω ZZ is required |
Compared with 1N5231B_NT50A, the legacy 1N5231B offers identical performance but lacks updated orderable nomenclature, while BZX55-C5V1 trades tighter voltage tolerance for higher impedance and leakage - making it suitable only for less demanding clamping roles.
Availability
1N5231B_NT50A is available at Aetrix Electronics and suitable for power supply feedback, sensor bias reference, and overvoltage clamp applications requiring stable component supply, long-lifecycle support, and JEDEC-standard DO-35 packaging.
Supply support for 1N5231B_NT50A 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 belongs to ON Semiconductor's general-purpose Zener diode product line, designed for voltage regulation, reference, and transient suppression in cost-sensitive, high-reliability linear power and signal conditioning circuits.
FAQ
What is the Zener voltage tolerance of the 1N5231B_NT50A?
The 1N5231B_NT50A has a Zener voltage tolerance of ±5% around its nominal 5.1 V rating, meaning the actual measured VZ falls between 4.845 V and 5.355 V at 20 mA test current and 25°C. This tolerance is guaranteed per ON Semiconductor's 1N5221B–1N5263B datasheet Rev. 3, and applies to all units regardless of batch or date code.
Does the 1N5231B_NT50A have a defined cathode marking?
Yes, the 1N5231B_NT50A uses a single color band on the DO-35 glass body to denote the cathode terminal. This marking aligns with JEDEC DO-204AH standards and is visible before and after PCB assembly. The anode is the unmarked lead, and correct orientation is critical for proper reverse-bias Zener operation.
What is the maximum power dissipation for the 1N5231B_NT50A at 70°C ambient?
At 70°C ambient, the 1N5231B_NT50A's power dissipation must be derated from its 500 mW rating at 25°C. With a derating factor of 4.0 mW/°C above 50°C, the allowable power drops to 500 mW − (4.0 mW/°C × 20°C) = 420 mW. Exceeding this risks thermal runaway or accelerated parameter drift.
How does the temperature coefficient of the 1N5231B_NT50A affect its regulation accuracy?
The 1N5231B_NT50A has a temperature coefficient of ±0.03 %/°C, meaning its Zener voltage shifts by up to ±1.53 mV/°C around 5.1 V. Over a 100°C range (−25°C to +75°C), this results in ≤±153 mV total drift - a key consideration in precision references where external compensation or tighter TC devices may be needed.
Is the 1N5231B_NT50A suitable for use in automotive under-hood applications?
The 1N5231B_NT50A supports an operating junction temperature range of −65°C to +200°C and is qualified per industrial reliability standards, but it is not AEC-Q200 qualified. For automotive under-hood use, system-level validation of thermal margin, vibration resistance, and long-term parametric stability is required - the 1N5231B_NT50A itself meets baseline environmental specs but lacks automotive-specific qualification documentation.
1N5231B_NT50A 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_NT50A FAQ
1.How can I place an order for 1N5231B_NT50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5231B_NT50A 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_NT50A reliable?
The price and inventory of 1N5231B_NT50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5231B_NT50A is usually 5 days.
3.What payment methods are accepted for 1N5231B_NT50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5231B_NT50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5231B_NT50A?
1N5231B_NT50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5231B_NT50A 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_NT50A?
For technical support, including 1N5231B_NT50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5231B_NT50A requirements.
6.How does Aetrix verify that 1N5231B_NT50A is sourced from the original manufacturer or authorized distributors?
All 1N5231B_NT50A 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_NT50A meets industry standards.
7.What is the process for return or replacement of 1N5231B_NT50A?
All 1N5231B_NT50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5231B_NT50A, 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_NT50A part is unused and in its original packaging.
Return procedure for 1N5231B_NT50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5231B_NT50A Tags
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