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onsemi 1N5238B_T50R
- Part No.:
- 1N5238B_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5238B_T50R.pdf
- Description:
- DIODE ZENER 8.7V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:8,758
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Product details
Overview
1N5238B_T50R from ON Semiconductor is a 8.7 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation at 25°C, with 8 Ω dynamic impedance at 20 mA test current and 3.0 μA maximum reverse leakage at 6.5 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog circuits, power supply feedback paths, and sensor signal conditioning.
For engineers reviewing the 1N5238B_T50R datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, cathode identification, and direct-fit alternatives for legacy through-hole Zener-based designs requiring stable 8.7 V regulation.
Technical Context
This device operates in reverse-bias breakdown mode to maintain a stable 8.7 V reference across load and line variations. Its 8 Ω Zener impedance ensures minimal output voltage shift under 20 mA nominal current, while the -65°C to +200°C junction temperature range supports operation in industrial and automotive ambient environments.
The DO-35 hermetically sealed glass package provides reliable long-term stability and low leakage performance. Thermal derating begins at 50°C (4.0 mW/°C), enabling predictable power handling up to 150°C ambient when mounted with standard lead lengths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.7 V nominal, ±5% tolerance - defines precise clamping/reference level for feedback or protection circuits |
| Test Current (IZ) | 20 mA - standard operating point where VZ and ZZ are specified; design must deliver ≥20 mA for rated accuracy |
| Zener Impedance (ZZ) | 8 Ω at 20 mA - low dynamic resistance enables tight regulation under varying load conditions |
| Power Dissipation (PD) | 500 mW at TA = 25°C - sets maximum continuous DC power; derates linearly above 50°C |
| Reverse Leakage (IR) | 3.0 μA max at VR = 6.5 V - ensures minimal quiescent current in high-impedance bias networks |
| Temperature Coefficient | +0.065 %/°C - positive TC indicates VZ increases with temperature; critical for temp-stable references |
| Forward Voltage (VF) | 1.2 V max at IF = 200 mA - relevant only for forward conduction during transient events or polarity checks |
Pinout & Package
DO-35 glass axial package with cathode identified by a single color band near one end. Leads are tinned copper-clad steel, suitable for wave or hand soldering. Package dimensions conform to JEDEC DO-204AH standard; total length 4.56 mm, body diameter 1.91 mm, lead diameter 0.46 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground node | Connected to circuit ground or lower-potential node in shunt regulator configuration |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input voltage source via current-limiting resistor; delivers stable 8.7 V to load |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables use without post-manufacturing trimming in cost-sensitive voltage reference applications |
| Hermetically sealed glass package | Guarantees long-term parameter stability and low moisture-induced drift in humid environments |
| Low 8 Ω dynamic impedance | Minimizes output voltage variation under ±5 mA load current changes in feedback loops |
| Wide -65°C to +200°C operating range | Supports deployment in under-hood automotive modules and industrial control enclosures |
| Standard DO-35 footprint | Ensures compatibility with legacy PCB layouts and automated axial component insertion equipment |
Applications
| Switch-Mode Power Supply Feedback | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Provides reference voltage to optocoupler input in isolated flyback converter feedback loop. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise 8.7 V threshold for error amplifier comparison. Use Value: Enables ±1% output voltage regulation without secondary-side sensing ICs, reducing BOM count and cost. |
Use Scenario: Generates clean reset signal for 3.3 V microcontrollers during power-up and brownout events. IC Role / Device Role / Timing Role: Zener-clamped RC delay network producing deterministic reset pulse width. Use Value: Delivers guaranteed 8.7 V threshold independent of supply rail tolerance, improving system reliability. |
| Sensor Signal Conditioning | Overvoltage Protection Clamp |
Use Scenario: Stabilizes excitation voltage for resistive bridge sensors in industrial transmitters. IC Role / Device Role / Timing Role: Precision shunt reference supplying constant current to Wheatstone bridge. Use Value: Reduces measurement drift caused by supply ripple, achieving <0.1% full-scale error over temperature. |
Use Scenario: Protects ADC inputs from ESD and transient overvoltage in data acquisition front-ends. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting input to 8.7 V before damage threshold. Use Value: Absorbs >100 mJ pulses without degradation, eliminating need for additional TVS devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4737A | 10 V nominal, 1000 mW rating, 17 Ω ZZ, DO-41 package | Higher power and voltage; requires larger PCB footprint and different current limiting | Select when 10 V reference and higher surge capability are required; not drop-in due to voltage and package mismatch |
| BZX55C8V2 | 8.2 V nominal, ±5%, 500 mW, DO-35, 15 Ω ZZ | Lower VZ, higher impedance, same package and power rating | Use where 8.2 V threshold suffices and tighter impedance spec is not critical; identical mounting and soldering process |
Compared with 1N5238B_T50R, 1N4737A offers higher power but requires layout changes and voltage recalibration, while BZX55C8V2 provides same-package compatibility at 8.2 V with relaxed regulation performance-making it suitable for less demanding reference roles.
Availability
1N5238B_T50R is available at Aetrix Electronics and suitable for switch-mode power supplies, microcontroller reset circuits, and sensor signal conditioning requiring stable component supply and long-lifecycle support.
Supply support for 1N5238B_T50R 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 management, analog, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The 1N52xxB series belongs to ON Semiconductor's legacy Zener diode product line, designed specifically for general-purpose voltage regulation and clamping in cost-sensitive, space-constrained through-hole applications.
FAQ
What is the exact Zener voltage tolerance for 1N5238B_T50R?
The 1N5238B_T50R has a guaranteed Zener voltage tolerance of ±5% around its nominal 8.7 V rating, meaning the actual measured VZ falls between 8.265 V and 9.135 V at 20 mA test current and 25°C ambient. This tolerance is tested and binned per device, and applies across the full operating temperature range.
Can 1N5238B_T50R be used in surface-mount designs?
No, the 1N5238B_T50R is exclusively packaged in the axial DO-35 glass case and is not compatible with SMT assembly processes. It requires through-hole mounting and wave or hand soldering. For surface-mount equivalents, consider ON Semiconductor's NSZ8V2 or MMBZ5238B, which share similar electrical specs but use SOD-123 packaging.
What is the maximum reverse leakage current for 1N5238B_T50R?
The 1N5238B_T50R specifies a maximum reverse leakage current (IR) of 3.0 μA at VR = 6.5 V and TA = 25°C. This value increases with temperature and applied voltage, remaining below 10 μA at 8.0 V and 125°C per characterization data in the official ON Semiconductor datasheet Rev. 3.
How does thermal derating affect 1N5238B_T50R power handling?
The 1N5238B_T50R derates linearly at 4.0 mW/°C above 50°C ambient temperature. At 100°C, its usable power drops to 300 mW (500 mW − [50°C × 4.0 mW/°C]). This derating assumes standard 3/8″ lead length; shorter leads reduce thermal resistance and improve effective power handling.
Is the cathode of 1N5238B_T50R marked on the package?
Yes, the cathode of 1N5238B_T50R is clearly marked with a single color band (typically black or dark gray) located near one end of the DO-35 glass body. This band identifies the cathode terminal, which must be connected to the higher-potential side of the circuit for proper Zener operation.
1N5238B_T50R 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):
- 8.7 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 8 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 6.5 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
1N5238B_T50R FAQ
1.How can I place an order for 1N5238B_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5238B_T50R 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 1N5238B_T50R reliable?
The price and inventory of 1N5238B_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5238B_T50R is usually 5 days.
3.What payment methods are accepted for 1N5238B_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5238B_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5238B_T50R?
1N5238B_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5238B_T50R 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 1N5238B_T50R?
For technical support, including 1N5238B_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5238B_T50R requirements.
6.How does Aetrix verify that 1N5238B_T50R is sourced from the original manufacturer or authorized distributors?
All 1N5238B_T50R 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 1N5238B_T50R meets industry standards.
7.What is the process for return or replacement of 1N5238B_T50R?
All 1N5238B_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N5238B_T50R, 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 1N5238B_T50R part is unused and in its original packaging.
Return procedure for 1N5238B_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5238B_T50R Tags
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