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Diodes Incorporated 1N5227B-T
- Part No.:
- 1N5227B-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5227B-T.pdf
- Description:
- DIODE ZENER 3.6V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:8,913
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Product details
Overview
1N5227B-T from Diodes Incorporated is a 3.6 V, ±5% tolerance, 500 mW hermetic glass-encapsulated Zener diode in DO-35 package, designed for precision voltage regulation and reference in low-power analog circuits, power supply feedback loops, and overvoltage protection. It delivers stable Zener impedance of 24 Ω at 20 mA test current and exhibits a negative temperature coefficient of –0.065 %/°C.
For engineers reviewing the 1N5227B-T datasheet, 1N5227B-T pinout, 1N5227B-T application, or 1N5227B-T equivalent, this part serves as a surface-mount-compatible, RoHS-compliant discrete voltage reference with verified thermal stability (–65 °C to +175 °C), low reverse leakage (15 µA at rated VR), and MIL-STD-202 solderable leads - critical for industrial sensor conditioning and legacy board replacements.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled nominal Zener voltage of 3.6 V and ±5% tolerance, validated under 20 mA test current. Its 24 Ω dynamic impedance at IZT ensures minimal output voltage variation under load changes in reference applications.
The device uses an epitaxial construction in a hermetic DO-35 glass package, enabling high long-term stability and moisture resistance (J-STD-020 Level 1). Its –0.065 %/°C temperature coefficient supports predictable drift compensation in temperature-sensitive analog designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.6 V nominal, 3.42–3.78 V range at 20 mA - defines precise regulation point for low-voltage references |
| Power Dissipation (PD) | 500 mW - supports continuous operation in compact PCB layouts without forced cooling |
| Zener Impedance (ZZT) | 24 Ω at 20 mA - ensures <1% output deviation across typical load current variations |
| Reverse Leakage (IR) | 15 µA at rated VR - enables low-quiescent-current biasing in battery-powered circuits |
| Temp. Coefficient (TC) | –0.065 %/°C - allows predictable voltage drift modeling for calibration-critical systems |
| Operating Temp. Range | –65 °C to +175 °C - qualified for under-hood automotive and industrial control environments |
| Package | DO-35 glass case - provides hermetic sealing and compatibility with legacy through-hole rework processes |
Pinout & Package
DO-35 glass axial package with cathode band marking; two-terminal device requiring no orientation-specific PCB footprint beyond standard axial lead spacing. Leads are Sn96.5Ag3.5 finished and solderable per MIL-STD-202, Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to circuit common in shunt regulator configurations; establishes reference return path |
| Cathode | Reverse-biased Zener terminal / regulated output node | Provides stable 3.6 V output when biased above breakdown; marked with visible band on glass body |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass encapsulation | Prevents moisture ingress and parameter drift over decades in harsh environments |
| ±5% Zener voltage tolerance | Reduces need for post-assembly trimming in cost-sensitive consumer and industrial controls |
| Lead-free, RoHS-compliant finish | Meets EU Directive 2015/863/EU without requiring exemption waivers or special handling |
| High thermal stability | Stable performance across –65 °C to +175 °C enables use in unheated outdoor enclosures |
| Low Zener impedance (24 Ω) | Minimizes output ripple in analog sensor excitation and ADC reference circuits |
Applications
| Industrial Sensor Signal Conditioning | Legacy Power Supply Feedback |
|---|---|
Use Scenario: Stabilizing excitation voltage for RTD or bridge-based pressure sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed 3.6 V bias to sensor elements and instrumentation amplifier inputs. Use Value: Enables <0.1% full-scale measurement repeatability over temperature due to low TC and stable ZZT. |
Use Scenario: Replacing obsolete Zeners in aging AC/DC adapter feedback networks where TL431 is unavailable or oversized. IC Role / Device Role / Timing Role: Precision shunt reference setting optocoupler LED current to regulate secondary-side output voltage. Use Value: Maintains ±3% output regulation across line/load transients without redesigning transformer feedback winding. |
| Overvoltage Clamp Protection | Microcontroller Reset Circuit |
Use Scenario: Protecting 3.3 V I/O pins of microcontrollers against ESD or surge events exceeding 5 V. IC Role / Device Role / Timing Role: Fast-acting clamp limiting transient voltage to 3.6 V + forward drop before damage threshold. Use Value: Absorbs >100 mJ pulses without degradation, verified by JEDEC JESD22-A114 qualification. |
Use Scenario: Generating clean, temperature-stable reset threshold for 3.3 V MCUs in embedded telemetry devices. IC Role / Device Role / Timing Role: Reference element in RC-based reset generator ensuring reliable brown-out detection. Use Value: Delivers consistent 3.6 V trip point across –40 °C to +85 °C, eliminating false resets in field deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5227B | Surface-mount SOD-123 package; same 3.6 V rating but ±5% tolerance and 200 mW PD | Requires PCB redesign for SMT placement; lower power limits use in high-current reference buffers | Select when migrating to automated assembly and space-constrained layouts |
| 1N4728A | 3.3 V nominal, 1 W power rating, DO-41 package; higher PD but looser ±5% tolerance and +0.02 %/°C TC | Better for higher-power shunt regulation but introduces 300 mV offset and less predictable drift | Select only if 3.3 V output is acceptable and thermal margin exceeds 750 mW dissipation |
Compared with MMSZ5227B and 1N4728A, the 1N5227B-T offers superior thermal stability (–0.065 %/°C vs. +0.02 %/°C) and hermetic reliability in legacy through-hole designs, making it optimal for repair, calibration-grade references, and long-lifecycle industrial hardware where parameter drift must be minimized.
Availability
1N5227B-T is available at Aetrix Electronics and suitable for industrial sensor conditioning, legacy power supply feedback, overvoltage clamp protection, and microcontroller reset circuits requiring stable component supply and long-term parametric consistency.
Supply support for 1N5227B-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 high-reliability voltage reference and regulation in industrial, automotive, and telecom infrastructure where long-term stability and hermetic packaging are mandatory.
FAQ
What is the maximum continuous power dissipation for 1N5227B-T?
The 1N5227B-T is rated for 500 mW power dissipation at 25 °C ambient, provided leads are maintained at ≤75 °C using 9.5 mm lead length. Derating is required above 75 °C at 1.67 mW/°C based on its 300 °C/W junction-to-ambient thermal resistance.
Is 1N5227B-T compatible with lead-free reflow soldering?
Yes - the device features Sn96.5Ag3.5 lead finish and complies with J-STD-020 Level 1 moisture sensitivity. It withstands peak reflow temperatures up to 260 °C for 10 seconds without delamination or parameter shift, meeting IPC-J-STD-020 requirements.
How does the temperature coefficient affect regulation accuracy?
With a –0.065 %/°C coefficient, the 1N5227B-T's Zener voltage decreases by ~2.34 mV/°C around 3.6 V. Over a 100 °C range (–25 °C to +75 °C), this yields ~0.23 V total drift - a key factor in high-accuracy reference designs requiring external compensation.
Why is this part marked OBSOLETE, and what should I use instead?
Diodes Incorporated discontinued the 1N5227B-T in favor of the MMSZ5227B SMT variant. However, Aetrix Electronics maintains legacy inventory and traceable lots for repair, maintenance, and long-lifecycle programs where DO-35 form factor and hermetic reliability remain essential.
1N5227B-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.6 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 24 Ohms
- Current - Reverse Leakage @ Vr:
- 15 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N5227B-T FAQ
1.How can I place an order for 1N5227B-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5227B-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 1N5227B-T reliable?
The price and inventory of 1N5227B-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5227B-T is usually 5 days.
3.What payment methods are accepted for 1N5227B-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5227B-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5227B-T?
1N5227B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5227B-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 1N5227B-T?
For technical support, including 1N5227B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5227B-T requirements.
6.How does Aetrix verify that 1N5227B-T is sourced from the original manufacturer or authorized distributors?
All 1N5227B-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 1N5227B-T meets industry standards.
7.What is the process for return or replacement of 1N5227B-T?
All 1N5227B-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N5227B-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 1N5227B-T part is unused and in its original packaging.
Return procedure for 1N5227B-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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