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Microchip Technology 1N5245B
- Part No.:
- 1N5245B
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5245B.pdf
- Description:
- DIODE ZENER 15V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:5,107
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Product details
Overview
1N5245B from Microsemi is a 15 V, ±5% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 20 mA test current and 8.5 Ω dynamic impedance at IZT, used for precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the 1N5245B datasheet, 1N5245B pinout, 1N5245B application, or 1N5245B equivalent, this page delivers verified electrical specs, thermal derating behavior, Zener voltage temperature coefficient (+0.082 %/°C), cathode band polarity marking, and RoHS-compliant e3 variant availability.
Technical Context
The 1N5245B operates as a two-terminal voltage reference device with reverse-biased breakdown behavior defined by its sharp knee at 20 mA test current and 8.5 Ω Zener impedance (ZZT) measured at IZK = 0.25 mA. Its DO-35 glass package enables stable operation from −65°C to +175°C with 250 °C/W junction-to-lead thermal resistance at 3/8″ lead length.
It exhibits a positive temperature coefficient of +0.082 %/°C (measured from 25°C to 125°C at rated IZT), confirming predictable voltage drift under thermal stress. The device is nonsensitive to ESD per MIL-STD-750 Method 1020 and features minimal capacitance - typical <2 pF - making it suitable for high-frequency bias and noise-sensitive reference nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 15 V @ 20 mA - defines regulated output level for low-current reference design |
| Zener Tolerance | ±5% (B suffix) - ensures voltage accuracy within 14.25–15.75 V at 25°C |
| Power Dissipation | 500 mW at 25°C - sets maximum continuous power before thermal derating begins |
| Zener Impedance | 8.5 Ω @ IZK = 0.25 mA - indicates low dynamic resistance for stable regulation under load transients |
| Temp. Coefficient | +0.082 %/°C - quantifies predictable +12.3 mV/°C drift across operating range |
| Reverse Leakage | 10 μA @ VR = 12 V - confirms low standby current in shunt regulator standby mode |
| Forward Voltage | ≤1.5 V @ 200 mA - supports use as clamp or protection diode in forward conduction |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with cathode indicated by a single black band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node in Zener regulation; forward conduction path when biased positively |
| Cathode | Banded end | Connected to higher-potential node during Zener operation; defines regulation reference point |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with JEDEC 1N52xxB standard for interchangeability and guaranteed VZ, IR, VF, ZZT, ZZK, and αVZ limits |
| Radiation-hardened construction | Inherently radiation tolerant per MicroNote 050 - suitable for aerospace and high-reliability industrial environments |
| Wide temperature operation | −65°C to +175°C storage and operating range - enables deployment in extreme ambient conditions |
| Low capacitance | Typical <2 pF - minimizes signal coupling and phase shift in RF bias and timing applications |
| ESD robustness | Nonsensitive per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling and assembly |
Applications
| Industrial Power Supply Reference | Automotive Sensor Biasing |
|---|---|
Use Scenario: Provides stable 15 V reference for op-amp feedback networks and ADC voltage references in 24 V rail-derived auxiliary supplies. IC Role / Device Role / Timing Role: Shunt voltage regulator establishing precise DC bias point independent of input ripple or load variation. Use Value: Maintains ≤±0.75 V regulation error over 1–20 mA operating current and −40°C to +125°C ambient, enabling 12-bit system accuracy. | Use Scenario: Supplies regulated bias voltage to piezoresistive pressure sensors and Hall-effect ICs in engine control modules. IC Role / Device Role / Timing Role: Low-noise, low-capacitance voltage clamp ensuring sensor excitation stability despite battery voltage fluctuations. Use Value: Delivers <2 pF parasitic capacitance and <10 μA leakage at 12 V, preventing signal distortion and offset drift in millivolt-level sensor outputs. |
| Overvoltage Protection Clamp | Programmable Current Source Reference |
Use Scenario: Protects microcontroller I/O pins and analog front-ends from transient surges exceeding 15 V in industrial PLC input stages. IC Role / Device Role / Timing Role: Fast-acting shunt clamp activated above 15.75 V (max VZ + tolerance), diverting excess current to ground. Use Value: Responds within nanoseconds due to low junction capacitance and zero recovery time, limiting peak clamped voltage to ≤16.5 V. | Use Scenario: Sets reference voltage for constant-current LED drivers and precision current mirrors in test equipment. IC Role / Device Role / Timing Role: Stable voltage source defining emitter-base or gate-source potential in transistor-based current-setting circuits. Use Value: Enables <0.1% current drift over temperature via +0.082 %/°C matched TC with bipolar transistor VBE, improving long-term calibration stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A (ON Semiconductor) | 15 V, ±5%, 1 W rating, DO-41 package, 16 Ω ZZT @ 25 mA | Higher power dissipation but larger footprint and higher impedance - less suitable for space-constrained low-current references | Select 1N4744A only when >500 mW power headroom or legacy DO-41 board compatibility is required |
| BZX55C15 (Vishay) | 15 V, ±5%, 500 mW, DO-35 package, 30 Ω ZZT @ 5 mA, −65°C to +175°C | Higher dynamic impedance and lower test current - reduced regulation stability under varying load conditions | Choose BZX55C15 only if cost sensitivity outweighs need for tight low-current regulation performance |
Compared with 1N4744A and BZX55C15, the 1N5245B offers superior low-current regulation fidelity (8.5 Ω ZZT at 0.25 mA) and tighter thermal tracking (+0.082 %/°C), making it optimal for precision analog reference designs where board space and thermal stability are critical.
Availability
1N5245B is available at Aetrix Electronics and suitable for industrial power supply reference, automotive sensor biasing, and overvoltage protection clamp applications requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for 1N5245B 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
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and high-performance analog and mixed-signal components.
The 1N52xxB series was designed specifically for precision voltage regulation in aerospace, defense, and industrial systems demanding wide temperature operation, ESD immunity, and long-term parametric stability.
FAQ
What is the nominal Zener voltage and tolerance of the 1N5245B?
The 1N5245B has a nominal Zener voltage of 15 V with a guaranteed tolerance of ±5% at 25°C and 20 mA test current. This means the actual breakdown voltage falls between 14.25 V and 15.75 V under specified conditions, as confirmed by JEDEC registration and Microsemi's published electrical characteristics table.
What package type and marking does the 1N5245B use?
The 1N5245B uses a DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with cathode identified by a single black band on the banded end. The device is marked with its full part number "1N5245B" and complies with MIL-STD-750 plating requirements for solderability.
What is the Zener impedance of the 1N5245B and why does it matter?
The 1N5245B has a Zener impedance (ZZT) of 8.5 Ω measured at IZK = 0.25 mA. This low dynamic resistance ensures minimal voltage variation under changing load currents - critical for maintaining regulation accuracy in low-power reference and bias circuits where current may fluctuate significantly.
Does the 1N5245B have a positive or negative temperature coefficient, and what is its value?
The 1N5245B has a positive temperature coefficient of +0.082 %/°C, measured from 25°C to 125°C at rated test current. This means its Zener voltage increases by approximately 12.3 mV per degree Celsius rise - a predictable and usable characteristic for temperature-compensated reference designs.
Is the 1N5245B suitable for high-reliability or aerospace applications?
Yes - the 1N5245B is inherently radiation-hardened per MicroNote 050, nonsensitive to ESD per MIL-STD-750 Method 1020, and qualified for operation from −65°C to +175°C. These attributes make it suitable for aerospace, defense, and other high-reliability applications where parametric stability and environmental resilience are mandatory.
1N5245B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N5245B FAQ
1.How can I place an order for 1N5245B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5245B 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 reliable?
The price and inventory of 1N5245B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5245B is usually 5 days.
3.What payment methods are accepted for 1N5245B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5245B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5245B?
1N5245B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5245B 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?
For technical support, including 1N5245B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5245B requirements.
6.How does Aetrix verify that 1N5245B is sourced from the original manufacturer or authorized distributors?
All 1N5245B 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 meets industry standards.
7.What is the process for return or replacement of 1N5245B?
All 1N5245B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5245B, 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 part is unused and in its original packaging.
Return procedure for 1N5245B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5245B 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
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