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onsemi 1N958B_T50R
- Part No.:
- 1N958B_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N958B_T50R.pdf
- Description:
- DIODE ZENER 7.5V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:4,101
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Product details
Overview
1N958B_T50R from Fairchild Semiconductor is a 7.5 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, 16.5 Ω typical zener impedance at 5.5 mA, and reverse leakage of 0.5 μA at 5.7 V. It provides stable voltage reference in low-power analog regulation and overvoltage protection circuits.
For engineers reviewing the 1N958B_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include nominal zener voltage (7.5 V), tolerance (±5%), zener impedance (16.5 Ω @ 5.5 mA), power rating (500 mW), and DO-35 package compatibility with through-hole PCB layouts.
Technical Context
The 1N958B_T50R operates as a silicon planar Zener diode with sharp reverse breakdown at 7.5 V nominal, defined under thermal equilibrium at lead temperature 30°C ±1°C and 3/8″ lead length. Its zener impedance (ZZ) is measured at 60 Hz with 0.1×DC test current, yielding 16.5 Ω typical at IZ = 5.5 mA.
It supports operation across -65°C to +200°C junction and storage temperature range, with maximum zener current IZM = 75 mA derived from power derating curves and actual VZ at operating point. Reverse leakage IR is specified as 0.5 μA at VR = 5.7 V, confirming low standby current in bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V nominal, ±5% tolerance - defines precise DC reference level for feedback or clamping |
| Zener Impedance (ZZ) | 16.5 Ω typical @ 5.5 mA - determines AC regulation stability under varying load |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous DC power handling in lead-mounted configuration |
| Derating Factor | 4.0 mW/°C above 75°C - enables thermal design margin calculation for elevated ambient conditions |
| Reverse Leakage (IR) | 0.5 μA @ VR = 5.7 V - ensures minimal quiescent current in high-impedance bias networks |
| Max Zener Current (IZM) | 75 mA - derived from worst-case VZ and derating curve, limits surge capability |
| Operating Temp Range | -65°C to +200°C - supports deployment in automotive under-hood and industrial environments |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device requiring no orientation-specific PCB footprint beyond standard 0.020″–0.030″ lead spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to ground or lower potential in shunt regulator configuration |
| Cathode | Zener breakdown terminal / regulated output node | Provides stable 7.5 V reference when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| ±5% VZ tolerance | Enables tight voltage reference without post-manufacture trimming in cost-sensitive designs |
| DO-35 glass package | Offers hermetic sealing and proven reliability in legacy through-hole assemblies |
| Low 0.5 μA leakage at 5.7 V | Minimizes error in high-impedance voltage divider or precision bias networks |
| 16.5 Ω typical ZZ | Delivers <1% output variation under ±10 mA load step in shunt regulator topologies |
Applications
| Overvoltage Clamp Circuit | Low-Power Voltage Reference |
|---|---|
Use Scenario: Protecting microcontroller I/O pins from transient surges on 5 V or 3.3 V rails. IC Role / Device Role / Timing Role: Shunt clamping element that conducts above 7.5 V to divert excess energy to ground. Use Value: Prevents latch-up or permanent damage using only 0.5 μA standby leakage and fast 60 Hz impedance response. | Use Scenario: Providing stable 7.5 V reference for ADC biasing or op-amp offset calibration in battery-powered sensors. IC Role / Device Role / Timing Role: Precision DC voltage source in high-impedance feedback paths. Use Value: Delivers ±5% accuracy and 16.5 Ω dynamic impedance to maintain reference stability under varying load currents. |
| Power Supply Feedback Divider | Signal Level Translation |
Use Scenario: Setting output voltage in isolated flyback converters via optocoupler feedback network. IC Role / Device Role / Timing Role: Zener reference in secondary-side error amplifier circuit. Use Value: Maintains regulation accuracy across -65°C to +200°C with predictable 4.0 mW/°C derating behavior. | Use Scenario: Translating 12 V logic signals to 7.5 V compatible levels for mixed-voltage interface ICs. IC Role / Device Role / Timing Role: Clamping diode limiting peak voltage to safe 7.5 V threshold. Use Value: Uses sharp 7.5 V breakdown and low 16.5 Ω impedance to minimize signal distortion during fast transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A | 5.1 V nominal, 5% tolerance, DO-41 package, 1 Ω ZZ @ 49 mA | Lower voltage, higher power (1 W), lower impedance - suited for higher-current regulation | Select when 5.1 V reference and >500 mW dissipation are required; not interchangeable due to VZ and package mismatch |
| BZX55C7V5 | 7.5 V nominal, 5% tolerance, DO-35 package, 30 Ω ZZ @ 5 mA | Same voltage and package but higher impedance - less stable under dynamic load | Acceptable where tighter regulation is not critical; verify thermal performance with 750 mW max rating |
Compared with 1N4733A and BZX55C7V5, the 1N958B_T50R offers optimal balance of 7.5 V accuracy, 16.5 Ω impedance, and DO-35 form factor for space-constrained, low-to-moderate current shunt regulation - neither alternative matches its exact VZ/ZZ/package combination.
Availability
1N958B_T50R is available at Aetrix Electronics and suitable for overvoltage protection, low-power voltage reference, and power supply feedback applications requiring stable component supply and long-term obsolescence management.
Supply support for 1N958B_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 manufacturer specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.
The 1N957B–1N979B series was designed for general-purpose Zener regulation in cost-sensitive, high-reliability through-hole applications including industrial controls and legacy consumer electronics.
FAQ
What is the nominal zener voltage and tolerance of the 1N958B_T50R?
The 1N958B_T50R has a nominal zener voltage of 7.5 V with a tolerance of ±5%, measured under thermal equilibrium at lead temperature 30°C ±1°C and 3/8″ lead length. This specification ensures predictable clamping behavior in voltage reference and protection circuits where tight DC accuracy is required without trimming.
What is the maximum power dissipation and derating behavior of the 1N958B_T50R?
The 1N958B_T50R is rated for 500 mW power dissipation at lead temperature ≤75°C, with linear derating of 4.0 mW/°C above that temperature. This allows thermal design margin calculation for ambient conditions up to +200°C junction temperature, supporting use in under-hood automotive and industrial environments.
What is the zener impedance and test condition for the 1N958B_T50R?
The 1N958B_T50R exhibits 16.5 Ω typical zener impedance (ZZ) measured at 60 Hz with AC test current equal to 0.1×DC current (IZ = 5.5 mA). This low dynamic impedance ensures stable regulation under small-signal load variations in feedback and reference applications.
What is the reverse leakage current specification for the 1N958B_T50R?
The 1N958B_T50R specifies 0.5 μA maximum reverse leakage current (IR) at reverse voltage VR = 5.7 V. This ultra-low leakage minimizes error in high-impedance bias networks and preserves battery life in portable sensor and instrumentation circuits.
What package type and marking convention does the 1N958B_T50R use?
The 1N958B_T50R uses the DO-35 glass axial package with cathode identified by a color band. Marking consists of Fairchild logo (line 1), "58" (line 2), and "B" (line 3), conforming to Fairchild's top-marking specification for 1Nxx series devices.
1N958B_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):
- 7.5 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 5.5 Ohms
- Current - Reverse Leakage @ Vr:
- 75 µA @ 5.7 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N958B_T50R FAQ
1.How can I place an order for 1N958B_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N958B_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 1N958B_T50R reliable?
The price and inventory of 1N958B_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N958B_T50R is usually 5 days.
3.What payment methods are accepted for 1N958B_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N958B_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N958B_T50R?
1N958B_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N958B_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 1N958B_T50R?
For technical support, including 1N958B_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N958B_T50R requirements.
6.How does Aetrix verify that 1N958B_T50R is sourced from the original manufacturer or authorized distributors?
All 1N958B_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 1N958B_T50R meets industry standards.
7.What is the process for return or replacement of 1N958B_T50R?
All 1N958B_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N958B_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 1N958B_T50R part is unused and in its original packaging.
Return procedure for 1N958B_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N958B_T50R Tags
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