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onsemi 1N5238BTR
- Part No.:
- 1N5238BTR
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5238BTR.pdf
- Description:
- DIODE ZENER 8.7V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:5,811
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Product details
Overview
1N5238BTR 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 ±0.065 %/°C temperature coefficient. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the 1N5238BTR datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal stability, junction temperature range (−65°C to +200°C), and compatibility with through-hole PCB layouts requiring hermetically sealed glass packages.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its Zener voltage is specified at IZ = 20 mA with thermal equilibrium maintained at lead temperature of 30°C ±1°C and 3/8″ lead length.
The 1N5238BTR exhibits low dynamic impedance (8 Ω) and tight voltage tolerance (±5%), enabling stable regulation under varying load conditions. Its −65°C to +200°C operating junction temperature range supports deployment in industrial and automotive environments where thermal cycling is present.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.7 V nominal, min 8.265 V / max 9.135 V at IZ = 20 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation (PD) | 500 mW at TA = 25°C - sets maximum continuous DC power handling before thermal derating begins |
| Dynamic Impedance (ZZ) | 8 Ω at IZ = 20 mA - determines regulation stiffness; lower value improves line/load regulation performance |
| Temperature Coefficient (TC) | ±0.065 %/°C - quantifies VZ drift per degree Celsius; enables prediction of voltage shift across operating temperature range |
| Reverse Leakage (IR) | 3.0 μA max at VR = 6.5 V - defines minimum off-state current in shunt regulation applications |
| Forward Voltage (VF) | 1.2 V max at IF = 200 mA - specifies forward conduction drop when used as rectifier or clamp in bidirectional circuits |
Pinout & Package
DO-35 glass axial package with cathode band marking; hermetically sealed, weight 0.137 g, JEDEC DO-204AH compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to lower potential node in Zener operation | Must be held at potential ≤ (VZ − VF) relative to cathode to avoid forward conduction during regulation |
| Cathode | Current exit terminal in forward bias; connected to higher potential node in Zener operation | Marked by color band; referenced to system ground or supply rail in shunt regulator topologies |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable regulation without post-manufacturing trimming in cost-sensitive consumer and industrial designs |
| Low dynamic impedance (8 Ω) | Minimizes output voltage variation under ±10 mA load current changes, improving reference stability |
| Hermetic glass DO-35 package | Provides long-term reliability and moisture resistance in harsh ambient conditions without conformal coating |
| Wide operating junction temperature (−65°C to +200°C) | Supports use in under-hood automotive modules, industrial motor controls, and high-temperature sensor interfaces |
Applications
| Low-Power Voltage Reference | Overvoltage Protection Clamp |
|---|---|
|
Use Scenario: Providing stable 8.7 V reference for ADC biasing and op-amp feedback networks in battery-powered IoT sensors. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise DC bias point independent of supply variation. Use Value: ±5% initial tolerance and ±0.065 %/°C TC ensure <±2% total drift over −40°C to +85°C, meeting 12-bit ADC accuracy requirements. |
Use Scenario: Clamping transient surges on 9 V rail in industrial PLC input modules exposed to inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional transient suppressor limiting voltage excursions above 9.135 V while blocking below 8.265 V. Use Value: 500 mW power rating absorbs 8.3 ms pulses per JEDEC standard, protecting downstream logic without crowbar action. |
| Power Supply Feedback Divider | Signal Level Translation |
|
Use Scenario: Setting output voltage in isolated flyback converter feedback loop via optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Precision Zener element in secondary-side voltage sensing network. Use Value: Low 8 Ω ZZ minimizes divider ratio error caused by current draw, maintaining ±1% output regulation across line/load. |
Use Scenario: Translating 3.3 V logic signals to 8.7 V level for driving legacy industrial interface receivers. IC Role / Device Role / Timing Role: Passive level shifter using forward-biased anode and Zener-biased cathode configuration. Use Value: 1.2 V forward drop and 8.7 V reverse breakdown enable clean 5.4 V swing with <10 ns propagation delay in unidirectional translation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4737A | 10 V nominal, 1 W power rating, 17 Ω ZZ, DO-41 package | Higher power and voltage; requires larger PCB footprint and different thermal layout | Select when >500 mW surge energy absorption or 10 V regulation is required |
| BZX55C8V2 | 8.2 V nominal, ±5%, 500 mW, DO-35, 10 Ω ZZ, −65°C to +175°C TJ | Slightly lower VZ and narrower junction temp range; same package and tolerance | Choose for tighter 8.2 V reference where 0.5 V margin suffices and legacy BZX55 sourcing is preferred |
Compared with 1N4737A and BZX55C8V2, the 1N5238BTR offers optimal balance of 8.7 V regulation, DO-35 footprint compatibility, and low-impedance stability for space-constrained 500 mW applications-making it preferable where exact voltage targeting and thermal robustness outweigh higher-power or alternate-voltage needs.
Availability
1N5238BTR is available at Aetrix Electronics and suitable for low-power voltage reference, overvoltage clamping, and signal level translation applications requiring stable component supply across industrial control, sensor interface, and embedded power management designs.
Supply support for 1N5238BTR 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 power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, medical, and IoT applications.
The 1N52xxB series was designed specifically for general-purpose, low-power Zener regulation in cost-sensitive, high-reliability applications where hermetic glass packaging and tight voltage tolerance are critical.
FAQ
What is the Zener voltage tolerance of the 1N5238BTR?
The 1N5238BTR has a Zener voltage tolerance of ±5%, meaning its nominal 8.7 V breakdown occurs between 8.265 V and 9.135 V when tested at IZ = 20 mA and thermal equilibrium conditions. This tolerance is guaranteed per ON Semiconductor's 1N5221B–1N5263B datasheet Rev. 3, December 2018.
Does the 1N5238BTR have a specified forward voltage?
Yes, the 1N5238BTR has a maximum forward voltage of 1.2 V at forward current IF = 200 mA, as stated in the "Electrical Characteristics" table of the official ON Semiconductor datasheet. This parameter supports use in bidirectional clamping or level-shifting configurations.
What is the maximum operating junction temperature for the 1N5238BTR?
The 1N5238BTR supports an operating junction temperature range of −65°C to +200°C, per the Absolute Maximum Ratings table in the ON Semiconductor 1N5221B–1N5263B datasheet. This wide range enables deployment in under-hood automotive and high-temperature industrial environments.
Is the 1N5238BTR compatible with lead-free soldering processes?
Yes, the 1N5238BTR's DO-35 glass package is rated for lead-free reflow with a maximum lead temperature of +230°C for 10 seconds at 1/16 inch from case, as specified in the Absolute Maximum Ratings section. This ensures compatibility with standard RoHS-compliant assembly lines.
How does the temperature coefficient affect the 1N5238BTR's regulation accuracy?
The 1N5238BTR has a temperature coefficient of ±0.065 %/°C, meaning its Zener voltage shifts by approximately ±0.0056 V per °C change from 25°C. Over a −40°C to +85°C ambient range, this results in up to ±0.7 V total drift-critical to model when designing precision references or clamps.
1N5238BTR 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
1N5238BTR FAQ
1.How can I place an order for 1N5238BTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5238BTR 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 1N5238BTR reliable?
The price and inventory of 1N5238BTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5238BTR is usually 5 days.
3.What payment methods are accepted for 1N5238BTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5238BTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5238BTR?
1N5238BTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5238BTR 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 1N5238BTR?
For technical support, including 1N5238BTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5238BTR requirements.
6.How does Aetrix verify that 1N5238BTR is sourced from the original manufacturer or authorized distributors?
All 1N5238BTR 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 1N5238BTR meets industry standards.
7.What is the process for return or replacement of 1N5238BTR?
All 1N5238BTR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5238BTR, 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 1N5238BTR part is unused and in its original packaging.
Return procedure for 1N5238BTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5238BTR Tags
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