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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Microchip Technology 1N5247B/TR

Name: 1N5247B/TR
Brand: Microchip Technology
SKU: 1N5247B/TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5247B/TR

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: DO-204AH, DO-35, Axial

Datasheet:: 1N5247B/TR.pdf

Description:: DIODE ZENER 17V 500MW DO204AH

Quantity:: RFQ Add To RFQ list

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Product details

Overview

1N5247B/TR from Microsemi is a 500 mW, 17 V ±5% glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for operation from −65 °C to +175 °C, with 7.4 Ω dynamic impedance at 20 mA test current and 0.1 μA max reverse leakage at 13.6 V. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.

For engineers reviewing the 1N5247B/TR datasheet, 1N5247B/TR pinout, 1N5247B/TR application, or 1N5247B/TR equivalent, key selection criteria include its 17 V nominal Zener voltage, ±5% tolerance (B suffix), 7.4 Ω Zener impedance at I_ZT, −65 °C to +175 °C operating range, and DO-35 glass axial-leaded package compatibility with through-hole PCB assembly.

Technical Context

This discrete Zener diode operates in reverse breakdown to maintain stable DC voltage across its terminals under varying load and line conditions. Its regulation performance is defined at 20 mA test current (I_ZT) and validated across −65 °C to +175 °C ambient temperature range with a positive temperature coefficient of +0.084 %/°C.

The device exhibits minimal capacitance (typical <2 pF per Figure 2), low forward voltage (<1.5 V at 200 mA), and inherent radiation hardness per MicroNote 050. It is nonsensitive to ESD per MIL-STD-750 Method 1020 and RoHS compliant when ordered with "e3" suffix.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	17 V - precise regulation point at 20 mA test current, enabling stable biasing in analog circuits
Zener Tolerance	±5% (B suffix) - ensures predictable voltage accuracy without post-selection or trimming
Power Dissipation	500 mW at 25 °C - supports continuous regulation in compact, non-heatsinked designs
Zener Impedance	7.4 Ω at I_ZT = 20 mA - low dynamic resistance minimizes output voltage variation under load changes
Reverse Leakage	0.1 μA max at 13.6 V - ensures negligible standby current in battery-powered or high-impedance sensing nodes
Operating Temperature	−65 °C to +175 °C - qualified for aerospace, downhole, and industrial environments requiring extreme thermal resilience
Package	DO-35 (DO-204AH) glass axial-leaded - standard through-hole footprint with hermetic seal and tin-lead or matte-tin plating

Pinout & Package

DO-35 (DO-204AH) glass axial-leaded package: hermetically sealed cylindrical glass body with two axial tinned leads; cathode indicated by single black band; polarity critical-banded end must be held positive relative to anode for Zener operation.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unbanded end)	Reference ground node	Connected to circuit common or lower-potential rail; forms return path during Zener conduction
Cathode (banded end)	Regulated output node	Provides stable 17 V reference when reverse-biased; must be driven positive relative to anode

Key Features

Feature	Design Value
JEDEC-registered 1N52xxB series	Industry-standard qualification ensuring interchangeability and consistent test methodology across suppliers
±5% Zener voltage tolerance (B suffix)	Reduces need for binning or calibration in production, lowering system test cost
Low 7.4 Ω dynamic impedance at 20 mA	Delivers tight regulation under moderate load shifts-critical for precision reference and feedback networks
Hermetic DO-35 glass package	Guarantees long-term reliability in humid, corrosive, or high-vacuum environments without encapsulation
Radiation-hardened per MicroNote 050	Validated for use in space-grade and nuclear instrumentation where total ionizing dose (TID) immunity is required

Applications

Low-Power Voltage Reference	Overvoltage Clamp Protection
Use Scenario: Providing stable 17 V bias for op-amp input stages or ADC reference dividers in portable instrumentation. IC Role / Device Role / Timing Role: Discrete Zener regulator establishing fixed reference potential independent of supply ripple or load drift. Use Value: Enables 12-bit+ measurement accuracy by holding reference within ±0.85 V over full temperature range and 20–100 mA current variation.	Use Scenario: Clamping transient surges on 15 V logic rails in automotive control modules exposed to load-dump events. IC Role / Device Role / Timing Role: Shunt protection element diverting excess energy to ground before downstream ICs exceed absolute maximum ratings. Use Value: Limits peak rail voltage to ≤17.9 V (17 V × 1.05) with sub-μA leakage, preserving signal integrity without loading normal operation.
Temperature-Stable Bias Network	High-Reliability Power Supply Feedback
Use Scenario: Setting collector current in RF transistor amplifiers where gain stability over −40 °C to +85 °C is mandatory. IC Role / Device Role / Timing Role: Zener-based current source with compensated temperature coefficient (+0.084 %/°C) matched to transistor V_BE drift. Use Value: Maintains bias current variation <±3% across full industrial temperature range, preventing gain compression or distortion.	Use Scenario: Generating error-sense voltage in isolated flyback converters where optocoupler feedback requires stable local reference. IC Role / Device Role / Timing Role: Primary-side Zener reference feeding TL431 or comparator input to regulate secondary output without auxiliary winding. Use Value: Achieves ±1.5% output regulation over line/load/temperature with no additional active components or layout complexity.

Low-Power Voltage Reference

Overvoltage Clamp Protection

Use Scenario: Providing stable 17 V bias for op-amp input stages or ADC reference dividers in portable instrumentation.

IC Role / Device Role / Timing Role: Discrete Zener regulator establishing fixed reference potential independent of supply ripple or load drift.

Use Value: Enables 12-bit+ measurement accuracy by holding reference within ±0.85 V over full temperature range and 20–100 mA current variation.

Use Scenario: Clamping transient surges on 15 V logic rails in automotive control modules exposed to load-dump events.

IC Role / Device Role / Timing Role: Shunt protection element diverting excess energy to ground before downstream ICs exceed absolute maximum ratings.

Use Value: Limits peak rail voltage to ≤17.9 V (17 V × 1.05) with sub-μA leakage, preserving signal integrity without loading normal operation.

Temperature-Stable Bias Network

High-Reliability Power Supply Feedback

Use Scenario: Setting collector current in RF transistor amplifiers where gain stability over −40 °C to +85 °C is mandatory.

IC Role / Device Role / Timing Role: Zener-based current source with compensated temperature coefficient (+0.084 %/°C) matched to transistor V_BE drift.

Use Value: Maintains bias current variation <±3% across full industrial temperature range, preventing gain compression or distortion.

Use Scenario: Generating error-sense voltage in isolated flyback converters where optocoupler feedback requires stable local reference.

IC Role / Device Role / Timing Role: Primary-side Zener reference feeding TL431 or comparator input to regulate secondary output without auxiliary winding.

Use Value: Achieves ±1.5% output regulation over line/load/temperature with no additional active components or layout complexity.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4742A	12 V nominal, ±5%, 1 W power rating, DO-41 package	Higher power handling but lower voltage; unsuitable for 17 V reference needs	Select only if system requires ≥12 V reference with higher surge capability and board space allows larger DO-41 footprint
MMBZ5247BS	17 V, ±5%, SOT-23 surface-mount, 200 mW rating	Same Zener voltage but lower power and different package; not drop-in compatible	Choose for space-constrained PCBs where reflow assembly and reduced profile outweigh through-hole reliability requirements

Compared with 1N5247B/TR, 1N4742A offers higher power but mismatched voltage, while MMBZ5247BS matches voltage but sacrifices power rating and package compatibility-neither is pin-compatible, and both require layout or thermal redesign for direct substitution.

Availability

1N5247B/TR is available at Aetrix Electronics and suitable for low-power voltage reference, overvoltage clamp protection, and temperature-stable bias network applications requiring stable component supply and long-lifecycle support.

Supply support for 1N5247B/TR 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-voltage analog components for aerospace, defense, and industrial markets.

The 1N52xxB series was designed specifically for precision voltage regulation in mission-critical systems where wide temperature operation, hermetic packaging, and JEDEC-standard consistency are mandatory.

FAQ

What is the nominal Zener voltage and tolerance of the 1N5247B/TR?

The 1N5247B/TR has a nominal Zener voltage of 17 V with a tolerance of ±5%, as indicated by the "B" suffix per Microsemi's documentation. This tolerance is guaranteed across the full operating temperature range of −65 °C to +175 °C and verified at 20 mA test current (I_ZT). The 1N5247B/TR is not rated for tighter tolerances such as ±1% or ±2%-those require "D" or "C" suffix variants.

Does the 1N5247B/TR have a specified Zener impedance, and at what condition is it measured?

Yes, the 1N5247B/TR has a maximum Zener impedance (Z_ZT) of 7.4 Ω, measured at the 20 mA Zener test current (I_ZT) and 25 °C ambient temperature. This value reflects dynamic resistance in the breakdown region and directly impacts regulation stability under varying load currents. The 1N5247B/TR also specifies 0.1 Ω minimum impedance at I_ZK = 0.25 mA for knee characterization.

What is the maximum reverse leakage current for the 1N5247B/TR, and at what voltage is it specified?

The 1N5247B/TR has a maximum reverse leakage current (I_R) of 0.1 μA, specified at a reverse voltage (V_R) of 13.6 V-80% of its nominal 17 V Zener voltage. This low leakage ensures minimal power loss in high-impedance reference paths and preserves battery life in always-on monitoring circuits using the 1N5247B/TR.

Is the 1N5247B/TR RoHS compliant, and how is compliance indicated in the part number?

The base 1N5247B/TR is not inherently RoHS compliant; RoHS compliance requires the "e3" suffix, yielding part number 1N5247B-e3/TR. Per Microsemi documentation, devices with "e3" suffix feature annealed matte-tin plating and meet JEDEC J-STD-609A Class 3 moisture sensitivity and lead-free soldering requirements. The 1N5247B/TR without "e3" uses traditional tin-lead plating.

What package type and mounting configuration does the 1N5247B/TR use?

The 1N5247B/TR uses the DO-35 (also designated DO-204AH) glass axial-leaded package: a hermetically sealed cylindrical glass body with two straight axial leads. Mounting requires through-hole insertion with the cathode (banded end) oriented toward the higher-potential node. Lead length must be ≥3/8 inch (10 mm) from the glass body for rated 500 mW power dissipation per Microsemi's derating curve.

1N5247B/TR Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: DO-204AH, DO-35, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 17 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 19 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 13 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)

1N5247B/TR FAQ

1.How can I place an order for 1N5247B/TR through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5247B/TR 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 1N5247B/TR reliable?

The price and inventory of 1N5247B/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5247B/TR is usually 5 days.

3.What payment methods are accepted for 1N5247B/TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5247B/TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5247B/TR?

1N5247B/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5247B/TR 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 1N5247B/TR?

For technical support, including 1N5247B/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5247B/TR requirements.

6.How does Aetrix verify that 1N5247B/TR is sourced from the original manufacturer or authorized distributors?

All 1N5247B/TR 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 1N5247B/TR meets industry standards.

7.What is the process for return or replacement of 1N5247B/TR?

All 1N5247B/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5247B/TR, 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 1N5247B/TR part is unused and in its original packaging.

Return procedure for 1N5247B/TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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