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onsemi 1N5989B_T50A
- Part No.:
- 1N5989B_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5989B_T50A.pdf
- Description:
- DIODE ZENER 3.6V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:6,413
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Product details
Overview
1N5989B_T50A from Fairchild Semiconductor is a 3.6 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C with 4.0 mW/°C derating, 90 Ω zener impedance at 5 mA test current, and 15 μA leakage current at 1 V reverse bias - used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the 1N5989B_T50A datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal limits, DO-35 terminal mapping, and direct alternatives for voltage regulation design validation.
Technical Context
The 1N5989B_T50A operates as a two-terminal silicon Zener diode with sharp reverse-breakdown characteristics defined at IZ = 5 mA and TJ = 25°C. Its 3.6 V nominal Zener voltage (min 3.42 V, max 3.78 V) is specified under thermal equilibrium at 30°C ±1°C lead temperature with 3/8″ lead length.
Zener impedance is measured at both IZ = 5 mA (90 Ω typical) and IZK = 250 μA (2300 Ω typical), supporting stable regulation across low- and mid-current conditions. Maximum Zener current IZM = 139 mA is derived from VZ and the 500 mW power limit, with full derating applied above 75°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal VZ | 3.6 V ±5% - defines regulated output voltage tolerance band for reference stability |
| Power Dissipation | 500 mW @ TL ≤ 75°C - sets maximum continuous power handling before thermal derating begins |
| Zener Impedance | 90 Ω @ IZ = 5 mA - determines AC regulation error under load current variation |
| Leakage Current | 15 μA @ VR = 1 V - ensures minimal standby current in high-impedance bias networks |
| Max Zener Current | 139 mA - calculated peak DC current before exceeding 500 mW at nominal VZ |
| Operating Temp | –65°C to +200°C - supports operation in automotive under-hood and industrial environments |
| Forward Voltage | 1.2 V max @ IF = 200 mA - enables use as clamp or series rectifier in dual-role designs |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device with no internal connections beyond anode and cathode leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential side in reverse-bias regulation; carries forward current up to 200 mA |
| Cathode | Zener breakdown terminal | Marked with color band; connected to higher potential side during regulation; sinks Zener current up to 139 mA |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables tight reference accuracy without external trimming in cost-sensitive analog supplies |
| DO-35 glass package | Provides hermetic sealing and stable long-term VZ drift under thermal cycling |
| Low 2300 Ω knee impedance | Ensures predictable turn-on behavior near breakdown for clamping and sensing applications |
| 1.2 V forward voltage max | Allows bidirectional use as both Zener regulator and low-drop rectifier in compact circuits |
| –65°C to +200°C operating range | Supports deployment in extreme environments including engine control units and downhole tools |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in temperature transmitters. IC Role / Device Role / Timing Role: Precision shunt voltage reference providing stable 3.6 V bias for op-amp gain-setting network. Use Value: ±5% VZ tolerance and 90 Ω dynamic impedance maintain <0.5% reference error across 1–5 mA load variation. |
Use Scenario: Clamping transient surges on USB D+ line during hot-plug events. IC Role / Device Role / Timing Role: Fast-acting shunt protector diverting ESD spikes above 3.6 V to ground. Use Value: 15 μA leakage at 1 V ensures negligible impact on USB signal integrity during normal operation. |
| Automotive Cabin Control Panel | Low-Power IoT Node Voltage Regulation |
Use Scenario: Regulating 3.6 V supply for microcontroller reset circuit in HVAC control module. IC Role / Device Role / Timing Role: Standby-mode Zener regulator maintaining brown-out detection threshold. Use Value: –65°C to +200°C rating guarantees reliable reset function across full vehicle thermal envelope. |
Use Scenario: Generating stable 3.6 V rail for BLE SoC in battery-powered environmental sensor. IC Role / Device Role / Timing Role: Low-quiescent shunt regulator replacing LDO to extend coin-cell life. Use Value: 500 mW power rating and 139 mA IZM support pulsed 30 mA transmit loads without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5226B (ON Semiconductor) | 3.3 V nominal, ±5%, DO-35, 500 mW, ZZ = 25 Ω @ 20 mA | Lower VZ and tighter ZZ suit higher-precision references but require adjusted resistor values | Select when 3.3 V regulation is acceptable and lower dynamic impedance is prioritized over exact 3.6 V match |
| BZX55-C3V6 (Vishay) | 3.6 V nominal, ±5%, DO-35, 500 mW, ZZ = 90 Ω @ 5 mA, IR = 10 μA @ 1 V | Nearly identical VZ and ZZ; slightly lower leakage improves high-impedance bias networks | Drop-in replacement where enhanced leakage performance is required without layout change |
Compared with 1N5989B_T50A, the 1N5226B offers lower voltage and better impedance but requires circuit recalibration, while the BZX55-C3V6 matches VZ and package exactly with marginally improved leakage - making it the preferred functional alternative for direct substitution.
Availability
1N5989B_T50A is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB port overvoltage protection, and automotive cabin control panel designs requiring stable component supply and long-lifecycle support.
Supply support for 1N5989B_T50A 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.
The 1N5989B_T50A belongs to Fairchild's legacy 1N59xxB Zener diode family, engineered for general-purpose voltage regulation and clamping in cost-sensitive, thermally demanding applications.
FAQ
What is the exact Zener voltage tolerance of the 1N5989B_T50A?
The 1N5989B_T50A has a nominal Zener voltage of 3.6 V with a guaranteed tolerance of ±5%, meaning the actual VZ falls between 3.42 V and 3.78 V when measured at IZ = 5 mA and TA = 25°C. This tolerance is confirmed in the Fairchild 1N5985B–1N6025B datasheet Rev. C2, Table 1.
Does the 1N5989B_T50A support operation above 100°C ambient?
Yes - the 1N5989B_T50A is rated for junction and storage temperatures from –65°C to +200°C. However, power dissipation must be derated linearly at 4.0 mW/°C above TL = 75°C. At 100°C lead temperature, usable power drops to 400 mW, and at 125°C, it reduces to 300 mW.
What is the forward voltage specification for the 1N5989B_T50A?
The 1N5989B_T50A specifies a maximum forward voltage of 1.2 V at IF = 200 mA, per the Absolute Maximum Ratings table in the Fairchild datasheet. This value is relevant when using the device in forward-conduction mode, such as in polarity-protection or dual-function clamp circuits.
Can the 1N5989B_T50A replace the 1N5227B in a 3.6 V reference design?
No - the 1N5227B is a 3.6 V Zener, but it uses a different construction (DO-35 vs. DO-35 is same package, yet 1N5227B has 20 mA test current and 25 Ω impedance). The 1N5989B_T50A is tested at 5 mA with 90 Ω impedance, so direct substitution may cause regulation shift unless the series resistor is recalculated for the different IZ and ZZ.
Is the cathode marking on the 1N5989B_T50A consistent with industry standard DO-35 polarity?
Yes - the 1N5989B_T50A follows standard DO-35 marking: a single color band (typically black or dark gray) denotes the cathode terminal. This aligns with JEDEC DO-35 mechanical specifications and matches polarity conventions used across Fairchild's Zener diode portfolio.
1N5989B_T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 3.6 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 15 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N5989B_T50A FAQ
1.How can I place an order for 1N5989B_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5989B_T50A 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 1N5989B_T50A reliable?
The price and inventory of 1N5989B_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5989B_T50A is usually 5 days.
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1N5989B_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5989B_T50A 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 1N5989B_T50A?
For technical support, including 1N5989B_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5989B_T50A requirements.
6.How does Aetrix verify that 1N5989B_T50A is sourced from the original manufacturer or authorized distributors?
All 1N5989B_T50A 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 1N5989B_T50A meets industry standards.
7.What is the process for return or replacement of 1N5989B_T50A?
All 1N5989B_T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5989B_T50A, 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 1N5989B_T50A part is unused and in its original packaging.
Return procedure for 1N5989B_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5989B_T50A Tags
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