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onsemi 1N5987B_T50R
- Part No.:
- 1N5987B_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5987B_T50R.pdf
- Description:
- DIODE ZENER 3V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:9,406
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Product details
Overview
1N5987B_T50R from Fairchild Semiconductor is a 3.0 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, 95 Ω zener impedance at 5 mA test current, and 50 μA leakage current at 1.0 V reverse bias - used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the 1N5987B_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance (±5%), thermal derating behavior, zener impedance at specified IZ, maximum leakage at VR, and DO-35 mechanical compatibility in space-constrained PCB layouts.
Technical Context
This device operates as a two-terminal voltage-regulating element relying on controlled reverse-breakdown conduction. Its Zener voltage is specified at 5 mA test current with min/typ/max values of 2.85 V / 3.0 V / 3.15 V, and it exhibits 95 Ω dynamic impedance (ZZ) under those conditions.
The diode supports operation across -65°C to +200°C junction and storage temperature range, with forward voltage limited to 1.2 V max at 200 mA forward current. Its 500 mW power rating applies only when lead temperature is maintained at or below 75°C using 3/8″ lead length per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.85–3.15 V @ 5 mA - defines stable regulation window for low-voltage reference design |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous power handling with mandatory thermal derating above 75°C |
| Zener Impedance (ZZ) | 95 Ω @ IZ = 5 mA - determines output voltage stability under load variation |
| Leakage Current (IR) | 50 μA @ VR = 1.0 V - quantifies off-state conduction affecting high-impedance bias networks |
| Max Zener Current (IZM) | 167 mA - derived from PD/VZ(min), limits peak surge capability without thermal runaway |
| Operating Temp Range | -65°C to +200°C - enables use in automotive under-hood, industrial, and aerospace environments |
| Forward Voltage (VF) | ≤1.2 V @ IF = 200 mA - ensures predictable turn-on behavior in clamp or protection configurations |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device requiring no external biasing or control signals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse breakdown return path | Connected to lower-potential node in shunt regulator or clamp configuration |
| Cathode | Forward current exit / Zener breakdown voltage reference terminal | Connected to regulated voltage node; marked by visible color band on DO-35 body |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables consistent regulation across production lots without post-assembly trimming |
| DO-35 glass package | Provides hermetic sealing and thermal stability for long-term reliability in harsh environments |
| Low leakage (50 μA @ 1 V) | Minimizes error in high-resistance voltage divider or sensor bias networks |
| 1.2 V max forward voltage | Ensures predictable clamping action during transient overvoltage events |
| 200°C max junction temperature | Supports operation in high-ambient-temperature applications such as engine control modules |
Applications
| Voltage Reference for ADC Biasing | Overvoltage Clamp in Sensor Interface |
|---|---|
Use Scenario: Providing stable 3.0 V reference to bias analog front-end circuitry feeding a 12-bit SAR ADC in an industrial temperature sensor module. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise DC offset and scale factor for signal conditioning amplifiers. Use Value: Tight ±5% VZ tolerance and low 95 Ω ZZ ensure <0.5 LSB reference drift over temperature and load variation. |
Use Scenario: Protecting a 3.3 V I²C bus line from ESD-induced transients in a smart HVAC controller. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor operating in reverse breakdown during overvoltage events. Use Value: 1.2 V forward voltage and 3.0 V Zener threshold enable fast clamping before downstream logic damage occurs. |
| Low-Power Microcontroller Reset Circuit | Current-Limited LED Bias Reference |
Use Scenario: Generating a clean reset signal for an ultra-low-power MSP430 microcontroller powered from a 3.3 V LDO. IC Role / Device Role / Timing Role: Zener-based voltage monitor triggering external reset IC when supply drops below 2.85 V. Use Value: 2.85 V minimum Zener voltage ensures reset assertion before brown-out threshold violation. |
Use Scenario: Setting constant current for indicator LEDs in battery-powered medical diagnostic equipment. IC Role / Device Role / Timing Role: Series-shunt reference element in a discrete constant-current source with emitter-follower pass transistor. Use Value: Stable 3.0 V reference enables ±2% LED current accuracy across -40°C to +85°C ambient range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A | 3.3 V nominal, ±5%, 1.0 W rating, DO-41 package | Higher power handling but larger footprint; less suitable for space-constrained PCBs | Select when >500 mW dissipation or higher IZM (>300 mA) is required |
| BZX55-C3V0 | 3.0 V nominal, ±5%, 500 mW, DO-35, tighter VZ distribution (±2% option available) | Same package and power rating; improved statistical VZ consistency in volume production | Prefer for high-yield manufacturing where tighter lot-to-lot VZ matching is critical |
Compared with 1N5987B_T50R, 1N4728A offers higher power but requires board real estate rework, while BZX55-C3V0 matches DO-35 form factor and improves VZ consistency - making it ideal for automated assembly lines demanding statistical process control.
Availability
1N5987B_T50R is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and reset circuit applications requiring stable component supply, long-term obsolescence management, and traceable sourcing for industrial control, medical instrumentation, and automotive subsystems.
Supply support for 1N5987B_T50R 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; its legacy Zener diode portfolio remains widely deployed in industrial and automotive systems.
The 1N5985B–1N6025B series was designed for general-purpose precision voltage regulation in cost-sensitive, high-reliability applications where DO-35 packaging, tight tolerance, and wide temperature operation are essential.
FAQ
What is the exact Zener voltage range for 1N5987B_T50R at 25°C?
The 1N5987B_T50R has a guaranteed Zener voltage range of 2.85 V to 3.15 V at 5 mA test current and 25°C ambient, with typical value at 3.0 V. This ±5% tolerance is measured under JEDEC-standard conditions: lead temperature at 30°C ±1°C, 3/8″ lead length, and thermal equilibrium. The 1N5987B_T50R specification sheet explicitly lists these min/typ/max values in its Electrical Characteristics table.
Does 1N5987B_T50R support operation above 100°C ambient temperature?
Yes, the 1N5987B_T50R is rated for junction temperatures from -65°C to +200°C, enabling reliable operation well above 100°C ambient - provided thermal design maintains TL ≤ 75°C for full 500 mW rating. Derating begins at 4.0 mW/°C above 75°C, so at 100°C lead temperature, usable power drops to 400 mW. The 1N5987B_T50R datasheet confirms this derating curve and absolute maximum ratings.
What is the forward voltage specification for 1N5987B_T50R?
The 1N5987B_T50R has a maximum forward voltage of 1.2 V at 200 mA forward current, as stated in the "VF Forward Voltage" note on page 3 of the official datasheet. This parameter is relevant for bidirectional transient suppression applications where the diode conducts in forward bias during negative-going surges. The 1N5987B_T50R's low VF ensures rapid clamping response without excessive power dissipation in forward mode.
Is 1N5987B_T50R available in tape-and-reel packaging for automated assembly?
Yes, the 1N5987B_T50R is offered in tape-and-reel format (T50R suffix denotes 500-piece reel), compatible with standard pick-and-place equipment for DO-35 axial devices. The reel packaging includes orientation control and static-safe materials per J-STD-033 requirements. Aetrix Electronics stocks this variant specifically to support SMT line integration and high-volume production of the 1N5987B_T50R.
How does the zener impedance of 1N5987B_T50R affect regulation accuracy?
The 1N5987B_T50R exhibits 95 Ω zener impedance (ZZ) at 5 mA test current, meaning a 1 mA change in Zener current causes approximately 95 mV shift in output voltage. This directly impacts regulation accuracy under varying load conditions - for example, in a 10 kΩ load-driven reference, ±10% current variation yields ±0.95% VZ drift. The 1N5987B_T50R's ZZ value is confirmed in the Electrical Characteristics table and must be factored into loop stability analysis for feedback-based regulators.
1N5987B_T50R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 3 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 50 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
1N5987B_T50R FAQ
1.How can I place an order for 1N5987B_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5987B_T50R 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 1N5987B_T50R reliable?
The price and inventory of 1N5987B_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5987B_T50R is usually 5 days.
3.What payment methods are accepted for 1N5987B_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5987B_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5987B_T50R?
1N5987B_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5987B_T50R 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 1N5987B_T50R?
For technical support, including 1N5987B_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5987B_T50R requirements.
6.How does Aetrix verify that 1N5987B_T50R is sourced from the original manufacturer or authorized distributors?
All 1N5987B_T50R 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 1N5987B_T50R meets industry standards.
7.What is the process for return or replacement of 1N5987B_T50R?
All 1N5987B_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N5987B_T50R, 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 1N5987B_T50R part is unused and in its original packaging.
Return procedure for 1N5987B_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5987B_T50R Tags
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