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Diodes Incorporated 1N5245B-T
- Part No.:
- 1N5245B-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5245B-T.pdf
- Description:
- DIODE ZENER 15V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:8,806
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Product details
Overview
1N5245B-T from Diodes Incorporated is a 15 V, ±5% tolerance, 500 mW glass-encapsulated Zener diode in DO-35 package, designed for precision voltage regulation and reference applications in power supply feedback loops, overvoltage protection circuits, and analog signal conditioning. It delivers stable Zener impedance of 16 Ω at 8.5 mA test current, with low temperature coefficient (+0.082 %/°C) and maximum reverse leakage of 0.1 µA at 11 V.
For engineers reviewing the 1N5245B-T datasheet, 1N5245B-T pinout, 1N5245B-T application, or 1N5245B-T equivalent, key selection criteria include Zener voltage accuracy, thermal stability under ambient drift, low leakage at rated VR, DO-35 mechanical compatibility, and RoHS-compliant Sn96.5Ag3.5 terminations for lead-free reflow assembly.
Technical Context
This discrete Zener diode operates in reverse breakdown mode to maintain a stable reference voltage across its terminals. Its 15 V nominal Zener voltage is specified at 8.5 mA test current (IZT), with tight ±5% tolerance and low dynamic impedance (16 Ω) ensuring minimal voltage deviation under load variation.
The device uses an epitaxial planar construction in a hermetic glass DO-35 case, enabling high long-term stability and low parameter drift over temperature (−65 °C to +175 °C). Its +0.082 %/°C temperature coefficient indicates predictable, monotonic voltage increase with rising junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 15 V nominal, 14.25–15.75 V range at 8.5 mA - defines regulated output level in shunt reference designs |
| Power Dissipation (PD) | 500 mW - sets maximum continuous power handling without derating at TL ≤75 °C |
| Zener Impedance (ZZT) | 16 Ω at IZT = 8.5 mA - determines AC regulation error under varying load current |
| Reverse Leakage (IR) | 0.1 µA max at VR = 11 V - ensures negligible current draw in standby or high-impedance bias networks |
| Temp Coefficient (TC) | +0.082 %/°C - quantifies voltage drift per degree Celsius rise in junction temperature |
| Package | DO-35 glass axial - provides hermetic sealing, moisture resistance (J-STD-020 Level 1), and standard through-hole mounting |
| RoHS Compliance | Lead-free finish (Sn96.5Ag3.5), compliant with EU RoHS 2 & 3 directives - supports environmentally regulated manufacturing |
Pinout & Package
DO-35 glass axial package with cathode band marking; two-terminal device with no internal complexity. Leads are solderable per MIL-STD-202, Method 208, and polarity is indicated by a single black band denoting the cathode terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse breakdown reference ground node | Connected to lower-potential side of regulated circuit; establishes reference return path |
| Cathode | Reverse breakdown terminal / Zener voltage output node | Provides stable 15 V reference when biased in reverse; marked with black band |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass encapsulation | Ensures long-term parameter stability and immunity to humidity-induced degradation in industrial environments |
| ±5% Zener voltage tolerance | Reduces need for post-assembly trimming in mid-precision voltage reference applications |
| Low 0.1 µA reverse leakage at 11 V | Minimizes quiescent current in battery-powered or high-impedance bias networks |
| +0.082 %/°C temperature coefficient | Enables predictable voltage drift compensation in temperature-critical analog circuits |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Used in the feedback divider of isolated DC-DC converters to regulate output voltage via optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Zener diode provides precise 15 V reference to set upper threshold of error amplifier input network. Use Value: Tight ±5% tolerance and low ZZT ensure <±1% output regulation accuracy across line/load/temperature. | Use Scenario: Placed across sensitive IC supply rails (e.g., microcontroller VDD) to clamp transient overvoltages above 15 V. IC Role / Device Role / Timing Role: Acts as passive crowbar element that conducts excess energy to ground during ESD or surge events. Use Value: 500 mW power rating and fast reverse recovery enable reliable clamping of short-duration transients without thermal runaway. |
| Analog Signal Level Shifting | Temperature-Stable Bias Generator |
Use Scenario: Biases op-amp inputs in rail-to-rail sensor interfaces where fixed 15 V offset improves dynamic range. IC Role / Device Role / Timing Role: Provides stable DC bias voltage referenced to system ground in precision instrumentation front-ends. Use Value: Low 16 Ω Zener impedance minimizes interaction with high-impedance op-amp inputs, preserving gain accuracy. | Use Scenario: Generates temperature-compensated bias current for matched transistor pairs in analog ICs or discrete amplifiers. IC Role / Device Role / Timing Role: Serves as temperature-tracking reference node due to predictable +0.082 %/°C coefficient. Use Value: Enables first-order thermal compensation without external thermistors or complex circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5245B | Surface-mount SOD-123 package; same 15 V, ±5%, 500 mW rating; 16 Ω ZZT at 8.5 mA | Replaces 1N5245B-T in space-constrained PCB layouts requiring automated placement | Select for new designs targeting high-volume SMT assembly; verify thermal pad layout for 300 °C/W RθJA equivalence |
| 1N4744A | 14 V nominal, ±5%, 1 W power rating, DO-41 package; higher power but different voltage and package | Used where higher dissipation margin or legacy DO-41 footprint is required | Choose only if 14 V regulation suffices and board layout accommodates larger DO-41 body and longer leads |
Compared with MMSZ5245B and 1N4744A, the 1N5245B-T offers identical Zener performance in a proven hermetic DO-35 form factor ideal for through-hole prototyping, repair, and high-reliability industrial assemblies where moisture resistance and long-term stability are prioritized over miniaturization.
Availability
1N5245B-T is available at Aetrix Electronics and suitable for power supply feedback references, overvoltage clamps, and analog bias generation requiring stable component supply and legacy through-hole compatibility.
Supply support for 1N5245B-T 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The 1N52xxB series belongs to Diodes' legacy Zener diode product line, engineered specifically for cost-sensitive, high-stability voltage reference and regulation tasks in industrial, consumer, and computing power systems.
FAQ
What is the maximum continuous power dissipation for 1N5245B-T?
The 1N5245B-T is rated for 500 mW continuous power dissipation at ambient temperature, provided leads are maintained at ≤75 °C with 9.5 mm lead length from the case. Derating is required above 75 °C at 1.67 mW/°C based on its 300 °C/W junction-to-ambient thermal resistance.
How does the +0.082 %/°C temperature coefficient affect circuit performance?
This positive temperature coefficient means the Zener voltage increases by approximately 12.3 mV per °C rise in junction temperature. In precision references, this drift must be accounted for in total error budgets; however, it enables simple first-order compensation when paired with negative-TC components like silicon diodes.
Is 1N5245B-T suitable for surface-mount assembly?
No - the 1N5245B-T uses a DO-35 glass axial package intended for through-hole mounting. For surface-mount equivalents, Diodes Incorporated recommends the MMSZ5245B in SOD-123 package, which matches its electrical specifications while supporting automated pick-and-place processes.
Why is the 1N5245B-T marked as obsolete, and what should designers do?
Diodes Incorporated has discontinued the 1N5245B-T as part of its legacy through-hole Zener portfolio, recommending MMSZ5245B for new designs. However, Aetrix Electronics maintains active inventory and supply chain support for ongoing production and repair of legacy systems dependent on the DO-35 form factor.
1N5245B-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 15 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 16 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 11 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N5245B-T FAQ
1.How can I place an order for 1N5245B-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5245B-T 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 1N5245B-T reliable?
The price and inventory of 1N5245B-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5245B-T is usually 5 days.
3.What payment methods are accepted for 1N5245B-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5245B-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5245B-T?
1N5245B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5245B-T 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 1N5245B-T?
For technical support, including 1N5245B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5245B-T requirements.
6.How does Aetrix verify that 1N5245B-T is sourced from the original manufacturer or authorized distributors?
All 1N5245B-T 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 1N5245B-T meets industry standards.
7.What is the process for return or replacement of 1N5245B-T?
All 1N5245B-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N5245B-T, 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 1N5245B-T part is unused and in its original packaging.
Return procedure for 1N5245B-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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