My Inquiry
My Account
onsemi 1N5237B_T50A
- Part No.:
- 1N5237B_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5237B_T50A.pdf
- Description:
- DIODE ZENER 8.2V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:7,654
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5237B_T50A 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 overvoltage protection in low-power analog circuits.
For engineers reviewing the 1N5237B_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy, thermal stability, low leakage (<3.0 μA at 6.5 V), junction temperature range (−65°C to +200°C), and DO-35 mechanical compatibility with through-hole PCB layouts.
Technical Context
This device operates as a reverse-biased silicon Zener diode, maintaining stable voltage regulation across its specified current range (0.25 mA to 20 mA). Its 8.2 V nominal breakdown voltage is defined at IZ = 20 mA with ±5% tolerance and validated at lead temperature of 30°C ±1°C using 3/8″ lead length per JEDEC test method.
The 1N5237B_T50A exhibits a positive temperature coefficient of +0.062 %/°C, indicating increasing Zener voltage with rising junction temperature - a critical factor when designing voltage references for environments with thermal cycling or unregulated ambient conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.79 V min / 8.2 V typ / 8.61 V max at IZ = 20 mA - defines regulated output voltage window under nominal bias. |
| Power Dissipation (PD) | 500 mW at TA = 25°C - sets maximum continuous DC power handling before thermal derating applies. |
| Dynamic Impedance (ZZ) | 8.0 Ω at IZ = 20 mA - determines regulation stiffness; lower value improves load/line transient response. |
| Temperature Coefficient (TC) | +0.062 %/°C - quantifies VZ drift per degree Celsius; enables thermal error budgeting in reference designs. |
| Reverse Leakage (IR) | ≤3.0 μA at VR = 6.5 V - ensures minimal parasitic current in standby or high-impedance sensing nodes. |
| Package | DO-35 glass axial - hermetically sealed, 0.137 g mass, 4.56 mm body length, compatible with standard through-hole assembly. |
Pinout & Package
DO-35 glass axial package: cylindrical glass body with two tinned copper alloy leads; cathode identified by color band; lead diameter 0.46 mm; overall length 4.56 mm; body diameter 1.91 mm; hermetically sealed per JEDEC DO-204AH.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lowest potential node; reverse bias applied between cathode and anode to activate regulation. |
| Cathode | Zener breakdown terminal / voltage reference output | Marked with color band; connects to regulated voltage node; supplies stable 8.2 V when reverse biased above knee voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage reference | ±5% VZ tolerance with tight 7.79–8.61 V span at 20 mA enables accurate analog signal conditioning and ADC reference scaling. |
| Low dynamic impedance | 8.0 Ω ZZ minimizes output voltage variation under changing load current - critical for stable biasing of op-amps and sensors. |
| Wide operating temperature | −65°C to +200°C junction range supports deployment in automotive engine compartments and industrial control enclosures. |
| Hermetic glass sealing | DO-35 package prevents moisture ingress and long-term parameter drift - essential for reliability in humid or corrosive environments. |
Applications
| Industrial Sensor Signal Conditioning | Microcontroller Power Rail Clamp |
|---|---|
Use Scenario: Stabilizing excitation voltage for resistive bridge sensors in PLC analog input modules. IC Role / Device Role / Timing Role: Zener diode provides fixed 8.2 V reference to drive Wheatstone bridge, replacing higher-cost voltage references. Use Value: Enables <1% full-scale error over −40°C to +85°C ambient due to predictable TC and low ZZ. | Use Scenario: Clamping 5 V supply rail to prevent MCU I/O damage during ESD transients or regulator overshoot. IC Role / Device Role / Timing Role: Acts as shunt overvoltage protector, diverting surge current when rail exceeds 8.2 V. Use Value: Limits peak voltage to safe level without adding series resistance or propagation delay - unlike TVS diodes with higher clamping voltage. |
| Programmable Logic Controller Analog Output | Legacy Equipment Voltage Calibration |
Use Scenario: Generating precise 8.2 V offset in 4–20 mA transmitter DAC output stage. IC Role / Device Role / Timing Role: Sets zero-current baseline voltage for current loop driver amplifier feedback network. Use Value: Maintains calibration stability over 10-year field life thanks to hermetic DO-35 construction and low IR drift. | Use Scenario: Replacing obsolete Zener in vintage test equipment requiring exact 8.2 V reference for meter movement calibration. IC Role / Device Role / Timing Role: Serves as drop-in replacement for legacy 1N5237B variants in repair and refurbishment workflows. Use Value: Matches original form, fit, function, and electrical specs - including DO-35 footprint and 5% tolerance - minimizing rework. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C8V2 | Same 8.2 V nominal, 5% tolerance, DO-35 package; 10 Ω ZZ at 5 mA (vs. 8 Ω at 20 mA for 1N5237B_T50A). | Higher ZZ and lower test current reduce regulation accuracy under 10–20 mA loads. | Select BZX55C8V2 only if design operates near 5 mA bias; prefer 1N5237B_T50A for tighter regulation at higher currents. |
| 1N4738A | 8.2 V nominal but 10% tolerance, DO-41 package (larger, 5.2 mm body), 500 mW rating, 5 Ω ZZ at 20 mA. | Looser tolerance increases initial calibration effort; DO-41 requires PCB pad redesign. | Choose 1N4738A only when higher surge capability or lower ZZ outweighs need for precision and DO-35 footprint. |
Compared with BZX55C8V2 and 1N4738A, the 1N5237B_T50A delivers superior voltage accuracy at typical operating currents and maintains strict DO-35 mechanical compatibility - making it optimal for space-constrained, precision-referenced analog systems where thermal stability and long-term drift matter.
Availability
1N5237B_T50A is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller protection circuits, and programmable logic controller analog outputs requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for 1N5237B_T50A 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, sensor, and logic solutions for automotive, industrial, cloud computing, and consumer markets.
The 1N52xxB series belongs to ON Semiconductor's general-purpose Zener diode product line, designed specifically for cost-sensitive, high-reliability voltage regulation and clamping in through-hole assembled equipment.
FAQ
What is the Zener voltage tolerance of the 1N5237B_T50A?
The 1N5237B_T50A has a ±5% Zener voltage tolerance, meaning its nominal 8.2 V breakdown voltage falls within 7.79 V (min) to 8.61 V (max) when tested at 20 mA and 30°C lead temperature. This tolerance is guaranteed per ON Semiconductor's 1N5221B–1N5263B datasheet Rev. 3, and applies directly to the 1N5237B_T50A variant.
Does the 1N5237B_T50A have a positive or negative temperature coefficient?
Yes, the 1N5237B_T50A has a positive temperature coefficient of +0.062 %/°C, indicating its Zener voltage increases linearly with rising junction temperature. This behavior is confirmed in the Electrical Characteristics table of the official ON Semiconductor datasheet and must be accounted for in temperature-critical reference designs.
What is the maximum reverse leakage current for the 1N5237B_T50A?
The maximum reverse leakage current for the 1N5237B_T50A is 3.0 μA, measured at VR = 6.5 V and TA = 25°C. This value is specified in the ON Semiconductor 1N5221B–1N5263B datasheet and reflects worst-case off-state conduction that impacts high-impedance bias networks.
Is the 1N5237B_T50A compatible with automated through-hole insertion equipment?
Yes, the 1N5237B_T50A uses the standard DO-35 glass axial package with 0.46 mm lead diameter and 4.56 mm body length - fully compliant with JEDEC DO-204AH and supported by industry-standard pick-and-place and wave solder tooling for through-hole assembly.
What is the power derating slope for the 1N5237B_T50A above 50°C ambient?
The 1N5237B_T50A derates at 4.0 mW/°C above 50°C ambient temperature, reducing its maximum allowable power dissipation from 500 mW at 25°C to 400 mW at 75°C. This linear derating curve is defined in the Absolute Maximum Ratings table of the ON Semiconductor datasheet and applies to continuous DC operation.
1N5237B_T50A 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_T50A FAQ
1.How can I place an order for 1N5237B_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5237B_T50A 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_T50A reliable?
The price and inventory of 1N5237B_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5237B_T50A is usually 5 days.
3.What payment methods are accepted for 1N5237B_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5237B_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5237B_T50A?
1N5237B_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5237B_T50A 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_T50A?
For technical support, including 1N5237B_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5237B_T50A requirements.
6.How does Aetrix verify that 1N5237B_T50A is sourced from the original manufacturer or authorized distributors?
All 1N5237B_T50A 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_T50A meets industry standards.
7.What is the process for return or replacement of 1N5237B_T50A?
All 1N5237B_T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5237B_T50A, 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_T50A part is unused and in its original packaging.
Return procedure for 1N5237B_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5237B_T50A Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
