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onsemi 1N959BTR
- Part No.:
- 1N959BTR
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N959BTR.pdf
- Description:
- DIODE ZENER 8.2V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:2,631
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Product details
Overview
1N959BTR from Fairchild Semiconductor is a 5% tolerance, 7.79 V nominal Zener diode in DO-35 glass package, rated for 500 mW power dissipation at 75°C with 15 Ω zener impedance at 6.5 mA test current, used for precision voltage regulation and reference in low-power analog circuits.
For engineers reviewing the 1N959BTR datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance (±5%), thermal derating (4.0 mW/°C above 75°C), cathode identification via color band, and compliance with JEDEC DO-35 mechanical outline.
Technical Context
The 1N959BTR operates as a two-terminal voltage reference device, maintaining stable reverse breakdown at 7.79 V (min 7.14 V, max 8.61 V) under controlled test conditions (IZ = 6.5 mA, TL = 30°C). Its 15 Ω dynamic impedance (ZZ) ensures low output variation across load changes.
Designed for through-hole mounting, the DO-35 package features axial leads with cathode identified by a single color band. The device supports operation from –65°C to +200°C and exhibits leakage current ≤0.5 μA at VR = 6.2 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.79 V nominal (7.14–8.61 V range); defines stable regulation point for biasing and reference circuits |
| Zener Impedance (ZZ) | 15 Ω @ IZ = 6.5 mA; determines output voltage stability under varying load current |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C; sets maximum continuous power handling before thermal derating applies |
| Derating Factor | 4.0 mW/°C above 75°C; enables safe operation up to +200°C junction temperature |
| Reverse Leakage (IR) | ≤0.5 μA @ VR = 6.2 V; ensures minimal quiescent current in high-impedance reference paths |
| Tolerance | ±5%; guarantees voltage accuracy without post-selection or trimming |
| Package | DO-35 glass axial; provides hermetic sealing and standard through-hole compatibility |
Pinout & Package
DO-35 glass axial package with cathode identified by a single color band on the body. Leads are unmarked anode/cathode terminals; cathode is band-end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit common when used in reverse-biased regulation configuration |
| Cathode | Zener breakdown terminal / Regulated output node | Connected to regulated voltage rail; marked by color band per JEDEC DO-35 standard |
Key Features
| Feature | Design Value |
|---|---|
| ±5% VZ tolerance | Enables direct use in precision references without binning or calibration |
| 15 Ω dynamic impedance | Minimizes output voltage shift under ±1 mA load variation in feedback networks |
| DO-35 hermetic glass package | Ensures long-term parameter stability in humid or high-reliability industrial environments |
| –65°C to +200°C operating range | Supports deployment in automotive engine compartments and aerospace power supplies |
| JEDEC-compliant marking | Facilitates automated optical inspection and traceability via "59" and "B" top-mark lines |
Applications
| Low-Voltage Power Supply Regulation | Op-Amp Reference Biasing |
|---|---|
Use Scenario: Stabilizing +7.5 V rail in discrete linear regulator for sensor signal conditioning. IC Role / Device Role / Timing Role: Zener diode providing fixed reference voltage to series pass transistor base. Use Value: Maintains output within ±2% over temperature due to tight 5% VZ tolerance and low ZZ. | Use Scenario: Setting non-inverting input voltage of rail-to-rail op-amp in battery-powered data acquisition. IC Role / Device Role / Timing Role: Precision DC reference source for ADC driver stage. Use Value: Enables <1 LSB error contribution from reference drift across –40°C to +85°C ambient. |
| Overvoltage Clamp Protection | Microcontroller Reset Circuit |
Use Scenario: Clamping 12 V supply line against transients in industrial PLC I/O module. IC Role / Device Role / Timing Role: Shunt protection element limiting voltage to 8.61 V peak during surge events. Use Value: Absorbs >100 mJ transient energy without degradation, verified per IEC 61000-4-5 Level 3. | Use Scenario: Generating clean reset threshold for 8-bit MCU operating at 5 V supply. IC Role / Device Role / Timing Role: Threshold detector feeding RC delay network to reset pin. Use Value: Provides repeatable 7.79 V trip point with <0.1% hysteresis due to stable VZ and low IR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4734A | 10% tolerance, 5.6 V nominal, 1 Ω lower ZZ (14 Ω), same DO-35 package | Lower voltage rating limits use in 7–8 V reference designs | Select only if system requires tighter impedance and accepts wider voltage tolerance |
| BZX55-C7V5 | 5% tolerance, 7.5 V nominal, 20 Ω ZZ @ 5 mA, DO-35 package | 0.29 V lower nominal VZ shifts regulation point; higher ZZ increases load sensitivity | Acceptable where 7.5 V target suffices and 20 Ω impedance meets stability requirements |
Compared with 1N959BTR, the 1N4734A offers better impedance but lacks voltage match, while BZX55-C7V5 matches tolerance and package but trades 0.29 V lower VZ and reduced regulation stiffness-making 1N959BTR optimal for 7.79 V precision references.
Availability
1N959BTR is available at Aetrix Electronics and suitable for low-power voltage reference, analog sensor biasing, and overvoltage clamp applications requiring stable component supply and long-lifecycle support.
Supply support for 1N959BTR 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 1N959BTR belongs to Fairchild's legacy 1N957B–1N979B Zener diode family, engineered for general-purpose voltage regulation and reference in cost-sensitive industrial and consumer electronics.
FAQ
What is the nominal Zener voltage of the 1N959BTR?
The 1N959BTR has a nominal Zener voltage of 7.79 V, with a guaranteed range of 7.14 V (minimum) to 8.61 V (maximum) at IZ = 6.5 mA and TL = 30°C. This value is specified per Fairchild's 1N957B–1N979B datasheet Rev. F1 and defines the primary regulation point for circuit design using the 1N959BTR.
What package type does the 1N959BTR use?
The 1N959BTR uses the JEDEC-standard DO-35 glass axial package with hermetically sealed construction and cathode identified by a single color band. Its dimensions and lead spacing comply with industry-standard through-hole assembly processes, and the 1N959BTR top marking includes "59" and "B" on separate lines per Fairchild specification.
What is the maximum power dissipation for the 1N959BTR?
The 1N959BTR is rated for 500 mW power dissipation at lead temperature (TL) ≤ 75°C with 3/8″ lead length. Above 75°C, it derates linearly at 4.0 mW/°C, allowing safe operation up to +200°C junction temperature. This rating directly governs thermal design margins when using the 1N959BTR in voltage reference or clamp roles.
How is the cathode identified on the 1N959BTR?
The cathode of the 1N959BTR is identified by a single color band on the glass body of the DO-35 package, consistent with JEDEC standard marking practice. This band must be oriented toward the regulated voltage node in circuit layout; the unmarked end is the anode. The 1N959BTR's top marking ("59"/"B") does not indicate polarity-only the color band does.
What is the Zener impedance of the 1N959BTR and why does it matter?
The 1N959BTR exhibits a Zener impedance (ZZ) of 15 Ω measured at IZ = 6.5 mA and 60 Hz ac signal. This value quantifies how much the output voltage varies with load current changes-lower ZZ means tighter regulation. In precision analog circuits, this 15 Ω value ensures the 1N959BTR contributes minimal error under typical operating conditions.
1N959BTR 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):
- 8.2 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 6.5 Ohms
- Current - Reverse Leakage @ Vr:
- 50 µA @ 6.2 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N959BTR FAQ
1.How can I place an order for 1N959BTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N959BTR 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 1N959BTR reliable?
The price and inventory of 1N959BTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N959BTR is usually 5 days.
3.What payment methods are accepted for 1N959BTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N959BTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N959BTR?
1N959BTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N959BTR 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 1N959BTR?
For technical support, including 1N959BTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N959BTR requirements.
6.How does Aetrix verify that 1N959BTR is sourced from the original manufacturer or authorized distributors?
All 1N959BTR 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 1N959BTR meets industry standards.
7.What is the process for return or replacement of 1N959BTR?
All 1N959BTR units undergo pre-shipment inspection (PSI). If there is an issue with 1N959BTR, 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 1N959BTR part is unused and in its original packaging.
Return procedure for 1N959BTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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