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Diodes Incorporated 1N5250B-T
- Part No.:
- 1N5250B-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5250B-T.pdf
- Description:
- DIODE ZENER 20V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:42,218
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Product details
Overview
1N5250B-T from Diodes Incorporated is a 20V, ±5% tolerance, 500mW surface-mount Zener diode in a hermetic DO-35 glass package, rated for operation from −65°C to +175°C, with 25Ω maximum Zener impedance at 6.2mA and 15ppm/°C temperature coefficient - used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1N5250B-T datasheet, 1N5250B-T pinout, 1N5250B-T application, or 1N5250B-T equivalent, key selection criteria include Zener voltage stability under thermal drift, low leakage current (≤0.1µA at 16V), DO-35 mechanical compatibility, RoHS-compliant Sn96.5Ag3.5 terminations, and direct replacement path to MMSZ5250B in space-constrained designs.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable voltage regulation across varying load and temperature conditions. Its 20V nominal Zener voltage is specified at 6.2mA test current, with 25Ω dynamic impedance ensuring minimal output variation under current transients.
The device uses an epitaxial construction for high stability and low noise, and its hermetic glass DO-35 package provides moisture resistance (J-STD-020 Level 1) and long-term parameter retention - critical for industrial and automotive power management circuits where reliability exceeds 15 years.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20V nominal, 19.0–21.0V range at IZT = 6.2mA - defines regulated output level in shunt regulator topologies |
| Power Dissipation (PD) | 500mW at TL ≤75°C - limits continuous current to ~25mA at 20V without heatsinking |
| Zener Impedance (ZZT) | 25Ω max at IZT = 6.2mA - determines output voltage ripple rejection under dynamic load changes |
| Reverse Leakage (IR) | ≤0.1µA at VR = 16V - ensures minimal quiescent current in battery-powered standby circuits |
| Temp. Coefficient (αVZ) | +0.086%/°C - predicts +17.2mV/°C drift near 25°C, requiring compensation in precision references |
| Thermal Resistance (RθJA) | 300°C/W - mandates lead length ≤9.5mm and ambient <75°C for full power rating |
Pinout & Package
Package: Hermetic DO-35 glass case with axial leads; cathode identified by band; weight ≈0.13g; moisture sensitivity Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated circuit; forms reference ground return path |
| Cathode | Reverse-biased Zener terminal / voltage regulation node | Connected to input rail; clamps voltage at VZ when reverse current exceeds knee threshold |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass package | Ensures zero moisture ingress and parametric stability over 20+ years in harsh environments |
| ±5% Zener tolerance | Reduces binning requirements and enables single-part sourcing for mid-precision applications |
| Lead-free Sn96.5Ag3.5 finish | Supports Pb-free reflow profiles (JEDEC J-STD-020) without solder joint embrittlement |
| −65°C to +175°C operating range | Enables deployment in under-hood automotive modules and industrial motor drives without derating |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulates TL431 reference voltage in isolated flyback converter feedback network. IC Role / Device Role / Timing Role: Zener diode provides stable 20V clamp to set optocoupler LED current threshold. Use Value: Maintains ±1.5% output regulation across line/load/temperature with <10mV ripple-induced error. | Use Scenario: Stabilizes excitation voltage for 4–20mA current-loop pressure transmitters. IC Role / Device Role / Timing Role: Acts as precision shunt reference for DAC output buffer stage. Use Value: Delivers <0.02% full-scale error drift over −40°C to +85°C due to low αVZ. |
| Automotive ECU Voltage Monitoring | Battery Management System Overvoltage Clamp |
Use Scenario: Monitors 24V rail integrity in engine control units during cold-crank events. IC Role / Device Role / Timing Role: Zener diode triggers supervisor IC reset when rail exceeds 20.5V. Use Value: Survives 15,000 cycles of 40V load-dump pulses due to hermetic DO-35 robustness. | Use Scenario: Clamps cell voltage in 12S Li-ion BMS during charging faults. IC Role / Device Role / Timing Role: Shunt element that diverts excess current above 20.2V to prevent cell overcharge. Use Value: Limits transient overshoot to <200ns response time with <0.5µA standby leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5250B | SOT-23 package; 20V, ±5%, 500mW; 30Ω ZZT; 0.1µA IR at 16V | Surface-mount footprint saves >60% board area; requires PCB rework for DO-35 legacy layouts | Select for new designs prioritizing density and automated assembly. |
| 1N4747A | DO-41 package; 20V, ±5%, 1W; 20Ω ZZT; 5µA IR at 16V | Higher power rating supports 50mA continuous; larger footprint and higher leakage limit low-power use | Select when thermal margin >1W is required and board space permits DO-41. |
Compared with MMSZ5250B and 1N4747A, the 1N5250B-T offers optimal balance of hermetic reliability, ultra-low leakage, and legacy DO-35 compatibility - making it preferred for repair, military-grade replacements, and high-reliability industrial retrofits where SMT conversion is impractical.
Availability
1N5250B-T is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor signal conditioning, automotive ECU voltage monitoring, and battery management system overvoltage clamping requiring stable component supply despite end-of-life status.
Supply support for 1N5250B-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 centers across Asia and manufacturing in China, Taiwan, and the U.S.
The 1N52xxB series belongs to Diodes' legacy Zener diode product line, engineered specifically for high-stability voltage reference and overvoltage protection in cost-sensitive, high-volume industrial and automotive applications.
FAQ
Is the 1N5250B-T still in production?
No - Diodes Incorporated has officially discontinued the 1N5250B-T. It is marked "OBSOLETE – PART DISCONTINUED" in DS18006 Rev. 19. Aetrix Electronics maintains limited legacy stock for repair and maintenance programs, with full traceability and date-code verification per batch.
What is the recommended replacement for new designs?
The MMSZ5250B in SOT-23 is Diodes Incorporated's designated functional replacement. It matches the 20V Zener voltage, ±5% tolerance, and 500mW rating, while offering modern surface-mount compatibility and identical electrical specs except for slightly higher Zener impedance (30Ω vs. 25Ω).
Can the 1N5250B-T be used in place of the 1N4747A?
Yes, electrically - both regulate at 20V with ±5% tolerance - but the 1N5250B-T has lower power (500mW vs. 1W), lower leakage (0.1µA vs. 5µA), and smaller DO-35 package. Use only where thermal and leakage constraints align; do not substitute in 1W-demanding circuits without derating analysis.
Does the 1N5250B-T meet automotive AEC-Q200 requirements?
No - the 1N5250B-T is not AEC-Q200 qualified. While its −65°C to +175°C operating range exceeds automotive ambient requirements, it lacks the stress testing, failure analysis, and qualification documentation mandated for AEC-Q200 Grade 2 or Grade 1 applications.
1N5250B-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):
- 20 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 15 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
1N5250B-T FAQ
1.How can I place an order for 1N5250B-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5250B-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 1N5250B-T reliable?
The price and inventory of 1N5250B-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5250B-T is usually 5 days.
3.What payment methods are accepted for 1N5250B-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5250B-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5250B-T?
1N5250B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5250B-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 1N5250B-T?
For technical support, including 1N5250B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5250B-T requirements.
6.How does Aetrix verify that 1N5250B-T is sourced from the original manufacturer or authorized distributors?
All 1N5250B-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 1N5250B-T meets industry standards.
7.What is the process for return or replacement of 1N5250B-T?
All 1N5250B-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N5250B-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 1N5250B-T part is unused and in its original packaging.
Return procedure for 1N5250B-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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