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onsemi 1N5248B_T50R
- Part No.:
- 1N5248B_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5248B_T50R.pdf
- Description:
- DIODE ZENER 18V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:9,240
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Product details
Overview
1N5248B_T50R from ON Semiconductor is a 18 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation at 25°C, with 7.0 Ω dynamic impedance at 12 mA test current and 0.1 μA maximum reverse leakage at 14.4 V. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the 1N5248B_T50R datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, cathode identification, DO-35 mechanical dimensions, and two validated alternative parts for design continuity.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its 18 V nominal Zener voltage (min 17.1 V, max 18.9 V) is specified at IZ = 12 mA, with TC of +0.085 %/°C ensuring predictable drift over -65°C to +200°C junction range.
The device uses a hermetically sealed DO-35 glass package with axial leads and cathode band marking. Thermal resistance from junction-to-ambient is ~250°C/W (calculated from 500 mW PD and 4.0 mW/°C derating above 50°C), confirming suitability for passive regulation in non-forced-air environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V nominal, 17.1–18.9 V range at IZ = 12 mA - defines regulated output voltage tolerance in feedback or clamp circuits. |
| Power Dissipation (PD) | 500 mW at TA = 25°C - sets maximum continuous DC power handling before thermal shutdown or degradation. |
| Dynamic Impedance (ZZ) | 7.0 Ω at IZ = 12 mA - determines voltage regulation stiffness; lower value improves line/load regulation performance. |
| Reverse Leakage (IR) | ≤0.1 μA at VR = 14.4 V - ensures minimal quiescent current in high-impedance bias networks or battery-powered references. |
| Temperature Coefficient | +0.085 %/°C - quantifies VZ drift per degree Celsius; positive sign indicates voltage increases with temperature. |
| Package | DO-35 glass axial - industry-standard through-hole package with cathode band, compatible with manual soldering and wave processes. |
| Forward Voltage (VF) | ≤1.2 V at IF = 200 mA - supports use as clamping diode in bidirectional transient suppression when forward-biased. |
Pinout & Package
DO-35 glass package: hermetically sealed, axial-leaded, 0.533 mm diameter body, 4.56 mm length, cathode identified by color band. Weight: 0.137 g. JEDEC DO-204AH compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener breakdown return path | Connected to lower-potential node in regulation circuit; carries full load current during Zener operation. |
| Cathode | Zener breakdown voltage reference terminal | Marked with color band; connected to higher-potential node; defines regulated output voltage relative to anode. |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables consistent regulation without post-production trimming in cost-sensitive consumer and industrial designs. |
| Low dynamic impedance (7.0 Ω) | Reduces output voltage variation under load changes - critical for stable reference in ADC bias or op-amp feedback. |
| Hermetic DO-35 glass seal | Ensures long-term reliability in humid or chemically aggressive environments where plastic packages may outgas or degrade. |
| Wide operating junction range (−65°C to +200°C) | Supports deployment in automotive engine compartments, industrial motor drives, and aerospace subsystems without derating. |
| Controlled temperature coefficient (+0.085 %/°C) | Allows predictable compensation in temperature-stable reference stacks or matched diode pairs. |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
|
Use Scenario: Generating stable 18 V reference for linear regulator feedback or sensor excitation in offline AC-DC adapters. IC Role / Device Role / Timing Role: Voltage reference element defining output setpoint via resistive divider feedback to error amplifier. Use Value: Maintains ±1.5% output accuracy over line/load variations due to tight VZ tolerance and low ZZ. |
Use Scenario: Protecting microcontroller I/O pins from ESD or surge events exceeding 18 V in industrial HMI panels. IC Role / Device Role / Timing Role: Shunt clamping device that conducts excess energy to ground when input exceeds VZ. Use Value: Limits transient voltage to ≤18.9 V with <0.1 μA standby leakage, preserving signal integrity and MCU reliability. |
| Current Source Bias | Analog Signal Level Shift |
|
Use Scenario: Establishing constant current for LED bias or phototransistor collector load in optical isolation circuits. IC Role / Device Role / Timing Role: Fixed-voltage drop element enabling precise current setting via series resistor (I = (VIN − 18 V)/R). Use Value: Delivers <1% current variation over −40°C to +85°C ambient due to predictable TC and low ZZ. |
Use Scenario: Shifting audio signal DC offset by 18 V in single-supply op-amp stages for rail-to-rail input compatibility. IC Role / Device Role / Timing Role: DC level translator using forward conduction (VF ≤1.2 V) or reverse Zener drop (18 V) depending on polarity. Use Value: Provides accurate, low-noise level shift with negligible loading (<0.1 μA reverse bias) on source impedance ≤100 kΩ. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4746A | 18 V nominal, ±5%, 1.0 W rating, DO-41 package, ZZ = 14 Ω @ 19 mA | Higher power handling but larger footprint and higher ZZ; requires PCB layout change. | Select when >500 mW dissipation or higher surge robustness is required; not drop-in due to DO-41 vs DO-35 lead spacing. |
| BZX55C18 | 18 V nominal, ±5%, 500 mW, DO-35 package, ZZ = 40 Ω @ 5 mA, TC = +0.07 %/°C | Same package but higher impedance and lower test current; less stable under variable loads. | Acceptable for low-precision biasing where cost is critical; avoid in high-accuracy references due to degraded regulation. |
Compared with 1N5248B_T50R, 1N4746A offers higher power margin but demands board rework, while BZX55C18 matches the DO-35 form factor yet sacrifices regulation precision-making 1N5248B_T50R optimal for space-constrained, medium-accuracy 18 V reference designs.
Availability
1N5248B_T50R is available at Aetrix Electronics and suitable for power supply reference, overvoltage clamp, and current source bias applications requiring stable component supply, consistent parametric performance, and long-term obsolescence management.
Supply support for 1N5248B_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, sensor, and discrete solutions for automotive, industrial, and cloud infrastructure markets.
The 1N52xxB series belongs to ON Semiconductor's legacy Zener diode product line, engineered for general-purpose voltage regulation and protection in cost-sensitive, high-reliability applications.
FAQ
What is the Zener voltage tolerance for 1N5248B_T50R?
The 1N5248B_T50R has a Zener voltage tolerance of ±5% around its nominal 18 V rating, meaning the actual measured VZ falls between 17.1 V and 18.9 V when tested at IZ = 12 mA and TA = 25°C. This tolerance is guaranteed per ON Semiconductor's 1N5221B–1N5263B datasheet Rev. 3, and applies to every unit shipped under this part number.
Does 1N5248B_T50R have a specified forward voltage?
Yes, the 1N5248B_T50R specifies a maximum forward voltage (VF) of 1.2 V at forward current (IF) = 200 mA. This parameter is documented in the "Electrical Characteristics" table of the official ON Semiconductor datasheet and confirms usability in dual-role applications such as bidirectional clamping or polarity-sensitive bias networks.
Can 1N5248B_T50R be used in surface-mount designs?
No, the 1N5248B_T50R is packaged exclusively in the through-hole DO-35 glass axial configuration and lacks SMT-compatible variants. Its leaded construction requires hole mounting and wave or hand soldering; no SOIC, SOD-123, or other surface-mount version exists under this part number or any direct suffix variant.
What is the thermal derating behavior of 1N5248B_T50R above 50°C?
The 1N5248B_T50R derates linearly at 4.0 mW/°C above 50°C ambient temperature, reducing its maximum allowable power dissipation from 500 mW at 25°C to zero at approximately 175°C. This derating slope is defined in the Absolute Maximum Ratings table and must be applied in thermal design calculations for enclosed or high-ambient environments.
How is cathode polarity identified on 1N5248B_T50R?
The cathode of the 1N5248B_T50R is marked by a distinct color band on the DO-35 glass body, positioned near one end of the cylindrical package. This band aligns with industry-standard polarity marking for axial diodes and must be oriented toward the higher-potential node in Zener regulation or clamping configurations.
1N5248B_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):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 21 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 14 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
1N5248B_T50R FAQ
1.How can I place an order for 1N5248B_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5248B_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 1N5248B_T50R reliable?
The price and inventory of 1N5248B_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5248B_T50R is usually 5 days.
3.What payment methods are accepted for 1N5248B_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5248B_T50R transactions.
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1N5248B_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5248B_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 1N5248B_T50R?
For technical support, including 1N5248B_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5248B_T50R requirements.
6.How does Aetrix verify that 1N5248B_T50R is sourced from the original manufacturer or authorized distributors?
All 1N5248B_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 1N5248B_T50R meets industry standards.
7.What is the process for return or replacement of 1N5248B_T50R?
All 1N5248B_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N5248B_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 1N5248B_T50R part is unused and in its original packaging.
Return procedure for 1N5248B_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5248B_T50R Tags
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