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onsemi 1N5237B_T50R
- Part No.:
- 1N5237B_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5237B_T50R.pdf
- Description:
- DIODE ZENER 8.2V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:8,562
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Product details
Overview
1N5237B_T50R from ON Semiconductor is a 5% tolerance, 8.2 V 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 ±0.062 %/°C temperature coefficient - used for precision voltage reference and low-power regulation in analog sensor signal conditioning circuits.
For engineers reviewing the 1N5237B_T50R datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, cathode identification, and direct-fit alternatives for legacy through-hole Zener-based biasing and clamping designs.
Technical Context
The 1N5237B_T50R operates as a two-terminal silicon Zener diode with reverse-biased breakdown regulation. Its 8.2 V nominal Zener voltage is specified at IZ = 20 mA, with Zener impedance (ZZ) of 8 Ω typical and 20 Ω maximum, and knee impedance (ZZK) of 500 Ω at IZK = 0.25 mA.
It features a negative temperature coefficient of +0.062 %/°C, indicating stable voltage drift over temperature, and supports continuous operation from –65°C to +200°C junction temperature, with 4.0 mW/°C linear derating above 50°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.79 V min / 8.2 V typ / 8.61 V max @ IZ = 20 mA - defines regulated output range under nominal bias |
| Power Dissipation (PD) | 500 mW @ TA = 25°C - sets maximum steady-state thermal load without heatsinking |
| Zener Impedance (ZZ) | 8 Ω typ / 20 Ω max @ IZ = 20 mA - determines output voltage stability under load variation |
| Temperature Coefficient (TC) | +0.062 %/°C - quantifies voltage drift per degree Celsius near 8.2 V operating point |
| Reverse Leakage (IR) | 3.0 μA max @ VR = 6.5 V - limits standby current in high-impedance reference nodes |
| Forward Voltage (VF) | 1.2 V max @ IF = 200 mA - defines conduction threshold when used in series protection or clamp configurations |
Pinout & Package
DO-35 hermetically sealed glass axial package with cathode indicated by color band; no active pins - anode and cathode are unidirectional terminals defined by physical orientation and marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to lower-potential node during forward conduction or clamping |
| Cathode | Current exit terminal in forward bias; Zener breakdown terminal in reverse bias | Marked with color band; connected to higher-potential node for voltage regulation |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Enables predictable regulation within ±0.41 V of 8.2 V nominal, suitable for non-critical reference applications |
| DO-35 glass package | Provides hermetic sealing and stable long-term parametric performance in humid or corrosive environments |
| –65°C to +200°C operating range | Supports deployment in automotive engine compartments and industrial control enclosures without derating |
| Low leakage at 6.5 V | Ensures minimal error current in high-impedance voltage divider networks feeding op-amp inputs |
Applications
| Industrial Sensor Biasing | Legacy Power Supply Clamp |
|---|---|
Use Scenario: Providing stable 8.2 V bias to bridge-type pressure transducers in factory-floor PLC modules. IC Role / Device Role / Timing Role: Voltage reference source for Wheatstone bridge excitation and op-amp input offset compensation. Use Value: Maintains <±1% output accuracy across –40°C to +85°C ambient due to low TC and tight VZ tolerance. | Use Scenario: Clamping transient overvoltage on 5 V logic rails in legacy telecom line cards using discrete Zener+resistor topology. IC Role / Device Role / Timing Role: Shunt regulator protecting downstream CMOS buffers from ESD-induced spikes. Use Value: Limits rail excursion to ≤8.61 V during 100 ns transients while dissipating <500 mW peak energy. |
| Audio Amplifier DC Offset Nulling | Microcontroller Reset Circuit Reference |
Use Scenario: Generating matched reference voltages for dual-op-amp DC offset cancellation in Class AB audio preamps. IC Role / Device Role / Timing Role: Precision DC voltage source for trimming amplifier quiescent points. Use Value: Delivers <0.5 mV/C drift over operating range, reducing thermal drift-induced hum in low-noise signal paths. | Use Scenario: Setting reliable reset threshold for 3.3 V microcontrollers in battery-powered IoT edge nodes. IC Role / Device Role / Timing Role: Threshold detector element in RC-based manual reset circuitry. Use Value: Ensures valid reset assertion down to 2.0 V supply with <3 μA leakage preserving battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4738A | Same 8.2 V nominal VZ, but 10% tolerance and 1 W rating in DO-41 package | Higher power handling enables use in higher-current shunt regulators; looser tolerance reduces precision | Select when >500 mW dissipation is required and ±5% regulation is acceptable |
| BZX55C8V2 | Same 8.2 V nominal VZ, 5% tolerance, but DO-35 package with 500 mW rating and 10 Ω ZZ | Identical form factor and regulation spec; slightly higher ZZ increases load sensitivity | Choose for second-source availability where ON Semi part discontinuation risk exists |
Compared with 1N4738A and BZX55C8V2, the 1N5237B_T50R offers tighter 5% tolerance and lower 8 Ω ZZ in the same DO-35 footprint, making it optimal for low-current, high-stability reference roles where space and precision outweigh raw power capacity.
Availability
1N5237B_T50R is available at Aetrix Electronics and suitable for industrial sensor biasing, legacy power supply clamping, and microcontroller reset circuit design requiring stable component supply and long-lifecycle support.
Supply support for 1N5237B_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 power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The 1N52xxB series was designed as a general-purpose, low-power Zener diode family for cost-sensitive, space-constrained voltage reference and protection applications in legacy and new-design through-hole systems.
FAQ
What is the Zener voltage tolerance of the 1N5237B_T50R?
The 1N5237B_T50R has a ±5% Zener voltage tolerance, meaning its rated 8.2 V breakdown occurs between 7.79 V and 8.61 V at 20 mA test current. This tolerance is confirmed in the ON Semiconductor datasheet Rev. 3, Electrical Characteristics table. The 1N5237B_T50R maintains this specification across its full operating temperature range without additional binning.
Does the 1N5237B_T50R have a cathode marking, and how is it identified?
Yes, the 1N5237B_T50R uses a color band on the DO-35 glass body to denote the cathode terminal, consistent with JEDEC DO-204AH standard marking. The band is located at one end of the cylindrical package and must be oriented toward the higher-potential node in reverse-bias regulation applications. This marking is visible without magnification and matches the polarity shown in the 1N5237B_T50R absolute maximum ratings diagram.
What is the maximum power dissipation of the 1N5237B_T50R at 75°C ambient?
At 75°C ambient, the 1N5237B_T50R'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 is 500 mW − (25°C × 4.0 mW/°C) = 400 mW. This value is explicitly stated in the Absolute Maximum Ratings table of the official 1N5237B_T50R datasheet and applies to free-air conditions without heatsinking.
Can the 1N5237B_T50R be used in surface-mount designs?
No, the 1N5237B_T50R is exclusively a through-hole DO-35 axial glass package and is not compatible with surface-mount assembly processes. It lacks solder pads, land patterns, or reflow-compatible construction. For SMT equivalents, engineers should consider ON Semiconductor's NZ9F8V2 or similar SOD-123 packaged Zeners - the 1N5237B_T50R itself requires wave or hand-soldering with 3/8" lead length per JEDEC standards.
What is the forward voltage drop of the 1N5237B_T50R at 200 mA?
The forward voltage drop of the 1N5237B_T50R is specified as 1.2 V maximum at 200 mA forward current, per the "VF Forward Voltage" note on page 3 of the ON Semiconductor datasheet. This parameter defines the conduction loss when the device is used in forward-biased protection or series-switching roles, and remains valid across the full operating temperature range.
1N5237B_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):
- 8.2 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
1N5237B_T50R FAQ
1.How can I place an order for 1N5237B_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5237B_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 1N5237B_T50R reliable?
The price and inventory of 1N5237B_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5237B_T50R is usually 5 days.
3.What payment methods are accepted for 1N5237B_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5237B_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5237B_T50R?
1N5237B_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5237B_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 1N5237B_T50R?
For technical support, including 1N5237B_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5237B_T50R requirements.
6.How does Aetrix verify that 1N5237B_T50R is sourced from the original manufacturer or authorized distributors?
All 1N5237B_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 1N5237B_T50R meets industry standards.
7.What is the process for return or replacement of 1N5237B_T50R?
All 1N5237B_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N5237B_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 1N5237B_T50R part is unused and in its original packaging.
Return procedure for 1N5237B_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5237B_T50R Tags
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MMBZ5240B-7-F
Diodes Incorporated
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onsemi
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