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onsemi 1N5256B_T26A
- Part No.:
- 1N5256B_T26A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5256B_T26A.pdf
- Description:
- DIODE ZENER 30V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:4,393
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Product details
Overview
1N5256B_T26A from ON Semiconductor is a 30 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation at 25°C, with 49 Ω dynamic impedance at 20 mA test current and 0.25 μA maximum reverse leakage at 23 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog supply rails.
For engineers reviewing the 1N5256B_T26A datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, temperature coefficient (+0.09 %/°C), junction temperature range (−65 to +200°C), and DO-35 mechanical compatibility with through-hole PCB layouts.
Technical Context
This device operates in reverse-bias breakdown mode to maintain stable voltage across its terminals under varying load or line conditions. Its 30 V nominal Zener voltage is specified at 20 mA test current, with 49 Ω dynamic impedance indicating moderate regulation sensitivity to current changes.
The DO-35 hermetically sealed glass package ensures long-term stability and low leakage, while the −65°C to +200°C operating junction temperature range supports use in industrial and automotive ambient environments where thermal cycling is present.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 30 V nominal, min 28.5 V / max 31.5 V at IZ = 20 mA - defines clamping threshold in protection circuits |
| Power Dissipation (PD) | 500 mW at TA = 25°C - sets maximum continuous power handling before thermal derating |
| Dynamic Impedance (ZZ) | 49 Ω at IZ = 20 mA - determines output voltage variation under load current shifts |
| Reverse Leakage (IR) | ≤0.25 μA at VR = 23 V - ensures minimal standby current in high-impedance bias networks |
| Temperature Coefficient | +0.09 %/°C - quantifies voltage drift per degree Celsius above 25°C |
| Junction Temperature Range | −65°C to +200°C - enables operation in extreme environmental or under-hood conditions |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device requiring no orientation-specific PCB footprint beyond standard 0.4-inch lead spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reverse-bias reference ground node | Connected to lower-potential side of Zener circuit; carries full load current during clamping |
| Cathode | Zener breakdown terminal / regulated output node | Connected to protected rail or reference point; maintains stable voltage relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable clamping without post-production trimming in cost-sensitive designs |
| Hermetically sealed DO-35 glass case | Prevents moisture ingress and parameter drift over decades of field operation |
| Low reverse leakage (≤0.25 μA) | Minimizes quiescent current draw in battery-powered or high-impedance sensing circuits |
| Stable temperature coefficient (+0.09 %/°C) | Reduces need for external compensation in wide-temperature-range instrumentation |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module Power Rail Clamp |
|---|---|
Use Scenario: Stabilizing 3.3 V or 5 V analog sensor supply against transient spikes on factory floor wiring. IC Role / Device Role / Timing Role: Voltage reference and overvoltage clamp protecting ADC input stages and op-amp bias networks. Use Value: Prevents sensor output corruption during ESD events or inductive switching noise, leveraging 30 V standoff and 500 mW surge capability. | Use Scenario: Clamping 12 V battery-derived microcontroller supply against load-dump transients up to 40 V. IC Role / Device Role / Timing Role: Secondary overvoltage protection stage after primary TVS, absorbing residual energy below 30 V threshold. Use Value: Extends system reliability by limiting rail excursion to 31.5 V max, within MCU absolute maximum rating margins. |
| Medical Portable Device Reference | Consumer Audio DC Bias Network |
Use Scenario: Providing stable 30 V reference for photodiode transimpedance amplifier gain-setting resistors. IC Role / Device Role / Timing Role: Precision voltage reference enabling repeatable calibration across production units. Use Value: Achieves <±1% total error over temperature due to tight 5% tolerance and low TC, reducing factory calibration steps. | Use Scenario: Biasing Class-A headphone amplifier output stage with stable DC offset control. IC Role / Device Role / Timing Role: Low-noise voltage reference establishing quiescent operating point for discrete transistor stages. Use Value: Suppresses audible hum from supply ripple via low 0.25 μA leakage and stable 30 V regulation under varying load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5256BRLG | Same electrical specs; tape-and-reel packaging (no suffix _T26A); identical DO-35 package | No functional difference; suited for automated SMT assembly rather than manual or wave-soldered through-hole | Select 1N5256BRLG for high-volume PCB assembly; retain 1N5256B_T26A for prototyping or low-volume hand-soldered builds |
| BZX55C30 | 30 V Zener, ±5%, but higher ZZ (70 Ω) and wider temp range (−65°C to +175°C); same DO-35 package | Lower regulation accuracy under dynamic load; acceptable where tighter impedance not required | Choose BZX55C30 only if supply current variation is minimal and thermal margin exceeds 175°C |
Compared with 1N5256B_T26A, 1N5256BRLG offers identical performance in tape-and-reel format for automation, while BZX55C30 trades regulation precision for broader legacy availability-neither is pin-compatible in packaging form factor, though both share DO-35 mechanical fit.
Availability
1N5256B_T26A is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive body control module protection, and portable medical device reference applications requiring stable component supply and long-lifecycle support.
Supply support for 1N5256B_T26A 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1N52xxB series was designed as a general-purpose, high-reliability Zener diode family for voltage regulation and transient suppression in cost-sensitive, space-constrained through-hole applications.
FAQ
What is the Zener voltage tolerance for 1N5256B_T26A?
The 1N5256B_T26A has a Zener voltage tolerance of ±5%, meaning its breakdown voltage falls between 28.5 V and 31.5 V when tested at 20 mA. This tolerance is guaranteed per ON Semiconductor's 1N5221B–1N5263B datasheet Rev. 3, and applies across the full operating temperature range without additional derating.
Does 1N5256B_T26A have a specified forward voltage?
Yes, the 1N5256B_T26A specifies a maximum forward voltage (VF) of 1.2 V at 200 mA forward current. This value is documented in the "Electrical Characteristics" section of the ON Semiconductor datasheet and reflects typical silicon diode conduction behavior in forward bias.
What is the maximum reverse leakage current for 1N5256B_T26A?
The maximum reverse leakage current for 1N5256B_T26A is 0.25 μA at 23 V reverse voltage and 25°C ambient temperature. This parameter is confirmed in the "Electrical Characteristics" table of the official ON Semiconductor datasheet and remains valid up to the rated junction temperature limit.
Is 1N5256B_T26A compatible with lead-free soldering processes?
Yes, the 1N5256B_T26A DO-35 package supports lead-free soldering with a maximum lead temperature of +230°C for 10 seconds, as specified in the "Absolute Maximum Ratings" section. Its glass-body construction and axial leads meet JEDEC J-STD-020 moisture sensitivity level 1 requirements.
What does the "T26A" suffix indicate in 1N5256B_T26A?
The "T26A" suffix in 1N5256B_T26A denotes a specific packaging variant: tape-and-reel with 2,000 units per reel and a 14 mm carrier tape width (T26), plus "A" indicating compliance with ON Semiconductor's internal tape specification revision. It is functionally identical to 1N5256B but optimized for automated placement.
1N5256B_T26A 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):
- 30 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 49 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 23 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
1N5256B_T26A FAQ
1.How can I place an order for 1N5256B_T26A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5256B_T26A 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 1N5256B_T26A reliable?
The price and inventory of 1N5256B_T26A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5256B_T26A is usually 5 days.
3.What payment methods are accepted for 1N5256B_T26A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5256B_T26A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5256B_T26A?
1N5256B_T26A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5256B_T26A 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 1N5256B_T26A?
For technical support, including 1N5256B_T26A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5256B_T26A requirements.
6.How does Aetrix verify that 1N5256B_T26A is sourced from the original manufacturer or authorized distributors?
All 1N5256B_T26A 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 1N5256B_T26A meets industry standards.
7.What is the process for return or replacement of 1N5256B_T26A?
All 1N5256B_T26A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5256B_T26A, 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 1N5256B_T26A part is unused and in its original packaging.
Return procedure for 1N5256B_T26A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5256B_T26A Tags
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MMBZ5240B-7-F
Diodes Incorporated
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