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Diodes Incorporated 1N5247B-T
- Part No.:
- 1N5247B-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5247B-T.pdf
- Description:
- DIODE ZENER 17V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:5,611
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Product details
Overview
1N5247B-T from Diodes Incorporated is a 17V ±5% tolerance, 500mW glass-encapsulated Zener diode in DO-35 package, rated for 7.4mA test current and 19Ω dynamic impedance at IZT, used for precision voltage regulation and reference in low-power analog circuits.
For engineers reviewing the 1N5247B-T datasheet, 1N5247B-T pinout, 1N5247B-T application, or 1N5247B-T equivalent, key selection criteria include Zener voltage stability over temperature (+0.084%/°C), hermetic glass packaging for long-term reliability, and RoHS-compliant Sn96.5Ag3.5 terminations suitable for automated SMT assembly with moisture sensitivity Level 1.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable DC voltage under varying load and line conditions. Its 300°C/W junction-to-ambient thermal resistance requires lead temperature control ≤75°C at 9.5mm length for full 500mW rating.
The device exhibits a positive temperature coefficient of +0.084%/°C above 5.6V, enabling predictable drift compensation in voltage references. Reverse leakage remains ≤0.1µA at 13V (rated VR), supporting low-quiescent-current bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17V nominal, 16.15–17.85V range at 7.4mA - defines regulated output voltage tolerance in feedback or reference paths |
| Power Dissipation (PD) | 500mW at TL ≤75°C - sets maximum continuous power handling in linear regulator shunt or clamp applications |
| Zener Impedance (ZZT) | 19Ω at IZT = 7.4mA - determines AC ripple rejection and regulation stiffness under dynamic load |
| Reverse Leakage (IR) | ≤0.1µA at VR = 13V - ensures minimal error current in high-impedance reference nodes |
| Temp Coefficient (αVZ) | +0.084%/°C - enables predictable voltage drift compensation in temperature-critical references |
| Package | DO-35 glass axial - provides hermetic sealing and thermal stability for industrial-grade reliability |
Pinout & Package
DO-35 glass axial package with cathode band marking; leads are Sn96.5Ag3.5 solderable per MIL-STD-202 Method 208; polarity indicated by black cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in reverse-biased regulation; forms reference ground return path |
| Cathode | Zener breakdown terminal / voltage reference output | Connected to regulated voltage node; delivers stable 17V reference when reverse-biased above knee voltage |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass encapsulation | Prevents moisture ingress and long-term parameter drift in humid or high-reliability environments |
| ±5% Zener voltage tolerance | Enables tight initial voltage accuracy without post-manufacture trimming in cost-sensitive designs |
| Lead-free RoHS-compliant finish | Sn96.5Ag3.5 terminations meet EU directives and support Pb-free reflow profiles (J-STD-020 Level 1) |
| High stability over temperature | +0.084%/°C TC allows predictable compensation in voltage references across –65°C to +175°C operating range |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 17V reference for adjustable linear regulators or feedback dividers in offline AC/DC adapters. IC Role / Device Role / Timing Role: Zener diode functions as shunt voltage reference, setting output voltage via resistor-divider feedback to controller IC. Use Value: 19Ω ZZT ensures <10mV ripple rejection at 10kHz, maintaining ±0.5% output regulation under load transients. | Use Scenario: Protecting microcontroller I/O pins from ESD-induced voltage spikes on 15V rail interfaces. IC Role / Device Role / Timing Role: Acts as passive clamping element, conducting excess energy above 17V to ground during transient events. Use Value: ≤0.1µA leakage at 13V prevents signal degradation in high-impedance input circuits while clamping >17V surges. |
| Temperature-Compensated Reference | Low-Power Sensor Biasing |
Use Scenario: Building a compensated 17V reference for RTD or thermistor measurement bridges requiring stable excitation. IC Role / Device Role / Timing Role: Zener diode serves as primary voltage source; its +0.084%/°C TC matches complementary NTC/PTC elements for net-zero drift. Use Value: Predictable TC enables passive compensation without active circuitry, reducing BOM count and power consumption. | Use Scenario: Biasing photodiode amplifiers in battery-powered gas sensors where quiescent current must remain below 1µA. IC Role / Device Role / Timing Role: Provides fixed 17V reverse bias to photodiode anode while minimizing dark current contribution. Use Value: Hermetic DO-35 package ensures stable leakage performance over 10-year field life in uncontrolled environmental conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5247B | SOT-23 surface-mount package; same 17V rating, ±5% tolerance, but 200mW PD and 30Ω ZZT | Designed for space-constrained PCBs; lacks hermetic seal and higher thermal resistance limits power handling | Select for high-density layouts where board area is critical and power dissipation stays below 200mW |
| 1N4746A | DO-41 package; 18V nominal, ±5% tolerance, 1W PD, 20Ω ZZT at 12.5mA | Higher power capability and different voltage grade; not a direct replacement due to 1V offset and larger footprint | Choose when 18V regulation is acceptable and 1W dissipation or improved thermal margin is required |
Compared with MMSZ5247B and 1N4746A, the 1N5247B-T offers superior long-term stability via hermetic glass packaging and optimal 500mW/17V balance for legacy through-hole designs, whereas alternatives trade off package form factor or voltage accuracy for power or density.
Availability
1N5247B-T is available at Aetrix Electronics and suitable for precision voltage reference, overvoltage protection, sensor biasing, and low-power analog regulation requiring stable component supply across industrial, instrumentation, and legacy system replacements.
Supply support for 1N5247B-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, specializing in high-reliability components for industrial, automotive, and computing markets.
The 1N52xxB series targets cost-effective, stable Zener regulation in legacy and maintenance-critical applications, emphasizing hermetic reliability and wide-temperature operation over high-speed or ultra-low-leakage performance.
FAQ
What is the maximum continuous power dissipation for 1N5247B-T?
The 1N5247B-T is rated for 500mW at ambient conditions where lead temperature is maintained at or below 75°C with 9.5mm lead length. Derating begins above this temperature at 1.67mW/°C based on its 300°C/W thermal resistance.
Is 1N5247B-T suitable for surface-mount assembly?
No - the 1N5247B-T uses a DO-35 glass axial package designed for through-hole mounting. For SMT equivalents, consider the MMSZ5247B in SOT-23, which shares the same 17V Zener voltage but has lower power rating and different thermal characteristics.
What does the "-T" suffix indicate in 1N5247B-T?
The "-T" suffix denotes tape-and-reel packaging: 10,000 units per reel in DO-35 carrier tape, optimized for automated pick-and-place insertion. The electrical and mechanical specifications are identical to the bulk version (1N5247B).
Why is 1N5247B-T marked as obsolete, and what should I use instead?
Diodes Incorporated discontinued the 1N5247B-T as part of the broader 1N52xxB family; the recommended replacement is MMSZ5247B for new designs. However, Aetrix Electronics maintains legacy inventory and supports ongoing production for systems requiring exact form-fit-function compatibility with DO-35 packaging.
1N5247B-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):
- 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:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N5247B-T FAQ
1.How can I place an order for 1N5247B-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5247B-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 1N5247B-T reliable?
The price and inventory of 1N5247B-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5247B-T is usually 5 days.
3.What payment methods are accepted for 1N5247B-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5247B-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5247B-T?
1N5247B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5247B-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 1N5247B-T?
For technical support, including 1N5247B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5247B-T requirements.
6.How does Aetrix verify that 1N5247B-T is sourced from the original manufacturer or authorized distributors?
All 1N5247B-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 1N5247B-T meets industry standards.
7.What is the process for return or replacement of 1N5247B-T?
All 1N5247B-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N5247B-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 1N5247B-T part is unused and in its original packaging.
Return procedure for 1N5247B-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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