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Diodes Incorporated 1N5229B-T
- Part No.:
- 1N5229B-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5229B-T.pdf
- Description:
- DIODE ZENER 4.3V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:10,842
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Product details
Overview
1N5229B-T from Diodes Incorporated is a 4.3 V, ±5% tolerance, 500 mW surface-mount Zener diode in a hermetic DO-35 glass package, rated for operation from −65 °C to +175 °C, with 22 Ω zener impedance at 20 mA and +0.055 %/°C temperature coefficient-used for precision voltage reference and low-power regulation in analog sensor signal conditioning circuits.
For engineers reviewing the 1N5229B-T datasheet, 1N5229B-T pinout, 1N5229B-T application, or 1N5229B-T equivalent, key selection criteria include its tight 4.09–4.52 V zener range, low 5 µA reverse leakage at rated voltage, stable thermal coefficient, RoHS-compliant Sn96.5Ag3.5 terminations, and DO-35 mechanical compatibility with legacy through-hole footprint adaptations.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal test current of 20 mA, delivering regulated voltage across load variations while maintaining ±5% tolerance and low dynamic impedance (22 Ω). Its hermetic glass package ensures long-term stability under thermal cycling and humidity exposure.
The device exhibits a positive temperature coefficient (+0.055 %/°C), making it suitable for temperature-compensated reference designs when paired with negative-coefficient components. Thermal resistance is 300 °C/W junction-to-ambient, assuming leads held ≤75 °C with 9.5 mm lead length.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.3 V nominal, 4.09–4.52 V range at 20 mA-defines stable reference point for biasing or clamping. |
| Power Dissipation | 500 mW maximum-supports continuous regulation in low-current analog stages without heatsinking. |
| Zener Impedance (ZZT) | 22 Ω at 20 mA-ensures minimal output voltage shift under load transients. |
| Reverse Leakage (IR) | 5.0 µA max at rated VR-preserves accuracy in high-impedance reference nodes. |
| Temperature Coefficient | +0.055 %/°C-enables predictable drift compensation in wide-temperature industrial sensors. |
| Operating Temperature | −65 °C to +175 °C-qualified for under-hood automotive and downhole instrumentation environments. |
Pinout & Package
Package: Hermetic DO-35 glass case with axial leads; cathode identified by band; weight ≈0.13 g; moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node during reverse-bias regulation. |
| Cathode | Zener breakdown terminal / voltage reference output | Provides stable 4.3 V relative to anode when reverse-biased above knee voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass packaging | Prevents moisture ingress and parameter drift over 15+ year field life in harsh environments. |
| ±5% zener tolerance | Reduces need for post-assembly trimming in cost-sensitive consumer and industrial power rails. |
| Lead-free Sn96.5Ag3.5 terminations | Enables compatibility with Pb-free reflow profiles while meeting MIL-STD-202 solderability requirements. |
| Low 5 µA reverse leakage | Maintains reference integrity in battery-powered IoT nodes where quiescent current must stay below 10 µA. |
Applications
| Industrial Sensor Signal Conditioning | Low-Power Microcontroller Reset Circuit |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADCs in pressure transducers operating from −40 °C to +125 °C. IC Role / Device Role / Timing Role: Zener diode provides fixed 4.3 V reference to ADC voltage reference input and op-amp bias network. Use Value: Tight 4.09–4.52 V tolerance and +0.055 %/°C TC enable <±0.5% total reference error across full temperature range. |
Use Scenario: Generating clean reset threshold for ARM Cortex-M0+ MCU in smart metering modules with 3.3 V supply rails. IC Role / Device Role / Timing Role: Zener clamps reset line to 4.3 V during brown-out detection, interfacing with external supervisor IC. Use Value: 5 µA reverse leakage prevents false resets during ultra-low-power sleep modes (<1 µA system current). |
| Automotive Cabin Temperature Monitor | Legacy Equipment Voltage Clamp |
Use Scenario: Regulating excitation voltage for NTC thermistor bridge in HVAC control units exposed to under-dash thermal cycling. IC Role / Device Role / Timing Role: Zener supplies stable 4.3 V to bridge excitation, reducing measurement drift caused by supply variation. Use Value: −65 °C to +175 °C rating and hermetic DO-35 package ensure reliability over 10,000 thermal cycles per AEC-Q200. |
Use Scenario: Protecting 5 V logic inputs on discontinued industrial PLC I/O modules against transient overvoltage. IC Role / Device Role / Timing Role: Zener acts as shunt clamp, diverting surge energy above 4.52 V to ground before IC damage occurs. Use Value: 500 mW power rating and 22 Ω impedance allow safe clamping of 100 ms, 100 mA surges without parametric shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5229B | Surface-mount SOD-123 package; same 4.3 V rating, ±5%, but lower 350 mW power rating and 30 Ω ZZT. | Designed for automated pick-and-place assembly; unsuitable for >350 mW sustained dissipation or high-reliability hermetic requirements. | Select when board space and assembly automation outweigh long-term hermetic stability needs. |
| 1N4733A | 5.1 V nominal, 1 W power, DO-41 package; different voltage, higher power, no RoHS-compliant finish specified. | Used in higher-current regulator feedback paths; incompatible for 4.3 V reference or RoHS-constrained designs. | Choose only if voltage requirement shifts to 5.1 V and thermal margin exceeds 500 mW. |
Compared with MMSZ5229B and 1N4733A, the 1N5229B-T offers unique hermetic reliability and exact 4.3 V regulation in legacy-compatible DO-35 form, making it irreplaceable for field-replacement and high-stability analog reference use cases despite obsolescence status.
Availability
1N5229B-T is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, low-power microcontroller reset circuits, and automotive cabin temperature monitoring requiring stable component supply despite its obsolete status.
Supply support for 1N5229B-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, serving industrial, computing, consumer, and communications markets since 1960.
The 1N52xxB series was designed for general-purpose, high-stability Zener voltage regulation in cost-sensitive, high-volume applications requiring hermetic reliability and tight tolerance-particularly in analog front-ends and power management subsystems.
FAQ
Is the 1N5229B-T still in active production?
No-the 1N5229B-T is officially obsolete and discontinued per Diodes Incorporated's DS18006 Rev. 19. However, Aetrix Electronics maintains limited legacy stock with full traceability and supports extended-life procurement for critical industrial and automotive programs.
What is the correct polarity marking for the 1N5229B-T?
The cathode is marked by a single color band on the glass body. When installed, the banded end connects to the higher-potential node (e.g., VCC side) to operate in reverse-bias Zener mode; the unmarked end is the anode and connects to ground or lower potential.
Can the 1N5229B-T replace the 1N5229B (non-T) version?
Yes-the "-T" suffix indicates tape-and-reel packaging (10,000 pcs/reel); electrically and mechanically identical to the bulk 1N5229B. Both share DO-35 package, 4.3 V zener voltage, ±5% tolerance, and hermetic construction-only packaging differs.
Why does the datasheet list "OBSOLETE – PART DISCONTINUED"?
Diodes Incorporated discontinued the entire 1N5221B–1N5267B family in September 2019, migrating design-in to the MMSZ52xxB SOD-123 series. The 1N5229B-T remains functionally valid and widely used in legacy systems where DO-35 form factor and hermetic reliability are mandatory.
1N5229B-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):
- 4.3 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 22 Ohms
- Current - Reverse Leakage @ Vr:
- 5 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
1N5229B-T FAQ
1.How can I place an order for 1N5229B-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5229B-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 1N5229B-T reliable?
The price and inventory of 1N5229B-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5229B-T is usually 5 days.
3.What payment methods are accepted for 1N5229B-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5229B-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5229B-T?
1N5229B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5229B-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 1N5229B-T?
For technical support, including 1N5229B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5229B-T requirements.
6.How does Aetrix verify that 1N5229B-T is sourced from the original manufacturer or authorized distributors?
All 1N5229B-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 1N5229B-T meets industry standards.
7.What is the process for return or replacement of 1N5229B-T?
All 1N5229B-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N5229B-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 1N5229B-T part is unused and in its original packaging.
Return procedure for 1N5229B-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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