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onsemi 1N5237B_T26A
- Part No.:
- 1N5237B_T26A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5237B_T26A.pdf
- Description:
- DIODE ZENER 8.2V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:5,773
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Product details
Overview
1N5237B_T26A 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_T26A datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, cathode identification, and direct replacement options for legacy Fairchild-designated Zener diodes in industrial control and power supply feedback paths.
Technical Context
The 1N5237B_T26A 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 guaranteed min/max bounds of 7.79 V and 8.61 V under 5% tolerance. Junction temperature range spans −65°C to +200°C, supporting operation in harsh environments.
Thermal derating begins above 50°C at 4.0 mW/°C, and forward voltage is ≤1.2 V at 200 mA. The device uses hermetically sealed DO-35 glass packaging with cathode band marking, compliant with JEDEC DO-204AH standard and rated for 230°C lead-soldering temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.79 V (min) to 8.61 V (max) at IZ = 20 mA - defines stable regulation window for feedback networks |
| Power Dissipation (PD) | 500 mW at TA = 25°C - sets maximum continuous DC or pulsed power handling |
| Dynamic Impedance (ZZ) | 8 Ω at IZ = 20 mA - determines output voltage stability under load variation |
| Temperature Coefficient (TC) | ±0.062 %/°C - quantifies VZ drift per degree Celsius over operating range |
| Reverse Leakage (IR) | 3.0 μA max at VR = 6.5 V - ensures minimal quiescent current in standby mode |
| Forward Voltage (VF) | ≤1.2 V at IF = 200 mA - supports use as clamp or protection diode in forward bias |
Pinout & Package
DO-35 glass axial package: hermetically sealed, 0.533 mm diameter body, 4.56 mm length, cathode identified by single color band. Weight: 0.137 g. Compliant with JEDEC DO-204AH.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal in forward bias; connected to ground or lower potential in Zener regulation | Provides current path into diode when reverse-biased for breakdown operation |
| Cathode | Negative terminal in forward bias; connected to regulated node in Zener configuration | Marked by color band; carries controlled breakdown current to maintain stable VZ |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Enables predictable regulation without post-production trimming in cost-sensitive designs |
| Low dynamic impedance (8 Ω) | Maintains tight output voltage under varying load currents in reference circuits |
| Stable temperature coefficient (±0.062 %/°C) | Minimizes drift across industrial temperature ranges (−40°C to +85°C ambient) |
| DO-35 glass hermetic seal | Ensures long-term reliability and moisture resistance in high-humidity environments |
Applications
| Industrial Sensor Reference | Linear Regulator Feedback |
|---|---|
Use Scenario: Providing stable 8.2 V reference for 4–20 mA transmitter analog front-end circuits. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage reference for op-amp biasing and DAC output scaling. Use Value: Tight 5% tolerance and low TC ensure <±10 mV drift over −25°C to +70°C, meeting IEC 61000-4-2 immunity requirements. | Use Scenario: Setting output voltage in discrete 3-terminal linear regulator using pass transistor and error amplifier. IC Role / Device Role / Timing Role: Shunt reference element defining regulated output via resistor divider feedback to error amp. Use Value: 8 Ω ZZ limits output voltage variation to <±40 mV under 5 mA load step, improving line regulation. |
| Overvoltage Clamp | Microcontroller Reset Circuit |
Use Scenario: Protecting ADC input pins from transient overvoltage events exceeding 10 V. IC Role / Device Role / Timing Role: Reverse-biased clamping diode limiting input voltage to safe Zener breakdown level. Use Value: Fast response (<1 ns) and 500 mW surge rating absorb 8.3 ms pulses up to 1.2 W without degradation. | Use Scenario: Generating clean reset signal for PIC or ARM microcontrollers during power-up sequencing. IC Role / Device Role / Timing Role: Zener-based threshold detector triggering reset IC when supply drops below 7.5 V. Use Value: Guaranteed 7.79 V minimum VZ ensures reliable reset assertion before brown-out detection threshold. |
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, but 1000 mW rating and DO-41 package; ZZ = 5 Ω at 21 mA | Higher power handling supports >100 mA regulation; larger footprint requires PCB redesign | Select when higher surge capability or lower impedance is required; not drop-in due to package size |
| BZX55-C8V2 | Same 8.2 V, 5% tolerance, DO-35, but ZZ = 10 Ω at 5 mA; TC = ±0.06 %/°C | Test current halved; slightly higher impedance affects regulation accuracy under load | Valid alternative where 5 mA test condition aligns with system bias current; identical mounting |
Compared with 1N4738A and BZX55-C8V2, the 1N5237B_T26A offers optimal balance of DO-35 compatibility, 20 mA test current alignment with common feedback networks, and industry-standard thermal derating - making it preferred for space-constrained, low-to-moderate power analog references.
Availability
1N5237B_T26A is available at Aetrix Electronics and suitable for industrial sensor interfaces, linear regulator feedback loops, and overvoltage protection circuits requiring stable component supply and long-lifecycle support.
Supply support for 1N5237B_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 supplier delivering energy-efficient, high-performance silicon solutions for automotive, industrial, cloud computing, and IoT applications.
The 1N52xxB series is part of ON Semiconductor's legacy Zener diode portfolio designed for general-purpose voltage regulation, reference, and clamping in cost-sensitive, high-reliability analog circuits.
FAQ
What is the Zener voltage tolerance of the 1N5237B_T26A?
The 1N5237B_T26A has a guaranteed 5% tolerance on its nominal 8.2 V Zener voltage, resulting in a validated range of 7.79 V to 8.61 V at 20 mA test current and 25°C ambient. This tolerance is confirmed in the ON Semiconductor 1N5221B–1N5263B datasheet Rev. 3, Table 2, and applies directly to the 1N5237B_T26A variant.
Does the 1N5237B_T26A have a defined forward voltage specification?
Yes, the 1N5237B_T26A specifies a maximum forward voltage of 1.2 V at 200 mA forward current. This parameter is explicitly listed in the "Electrical Characteristics" section of the ON Semiconductor datasheet and confirms usability in dual-role applications such as reverse-bias regulation and forward-bias clamping or protection.
What is the thermal derating behavior of the 1N5237B_T26A above 50°C?
The 1N5237B_T26A derates linearly at 4.0 mW/°C above 50°C ambient temperature. At 75°C, its usable power dissipation reduces to 400 mW (500 mW − [25°C × 4.0 mW/°C]). This derating curve is documented in the Absolute Maximum Ratings table and must be applied in thermal design for enclosed or high-ambient environments.
Is the 1N5237B_T26A compatible with lead-free reflow soldering processes?
The 1N5237B_T26A supports lead-free assembly: its DO-35 glass package is rated for lead temperature up to +230°C for 10 seconds at 1/16 inch from case, matching standard SnAgCu reflow peak profiles. This specification is confirmed in the Absolute Maximum Ratings table under "Lead Temperature".
How is cathode polarity identified on the 1N5237B_T26A package?
The cathode of the 1N5237B_T26A is marked by a single color band on the DO-35 glass body, consistent with JEDEC DO-204AH standard. This band corresponds to the cathode terminal, which must be connected to the higher-potential node in Zener regulation configurations - a detail confirmed in the mechanical drawings and top-marking diagrams of the official datasheet.
1N5237B_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):
- 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_T26A FAQ
1.How can I place an order for 1N5237B_T26A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5237B_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 1N5237B_T26A reliable?
The price and inventory of 1N5237B_T26A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5237B_T26A is usually 5 days.
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1N5237B_T26A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5237B_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 1N5237B_T26A?
For technical support, including 1N5237B_T26A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5237B_T26A requirements.
6.How does Aetrix verify that 1N5237B_T26A is sourced from the original manufacturer or authorized distributors?
All 1N5237B_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 1N5237B_T26A meets industry standards.
7.What is the process for return or replacement of 1N5237B_T26A?
All 1N5237B_T26A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5237B_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 1N5237B_T26A part is unused and in its original packaging.
Return procedure for 1N5237B_T26A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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