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onsemi 1N5988B_T50A
- Part No.:
- 1N5988B_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5988B_T50A.pdf
- Description:
- DIODE ZENER 3.3V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:7,106
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Product details
Overview
1N5988B_T50A from Fairchild Semiconductor is a 3.3 V, ±5% tolerance Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C with 4.0 mW/°C derating, used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the 1N5988B_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance (±5%), zener impedance (95 Ω @ 5 mA), leakage current (25 μA @ 1 V), maximum zener current (152 mA), and DO-35 thermal derating behavior.
Technical Context
The 1N5988B_T50A operates as a two-terminal voltage-regulating device with sharp reverse breakdown at nominal 3.3 V, defined at 5 mA test current and measured under thermal equilibrium at lead temperature of 30°C ± 1°C with 3/8″ lead length. Its zener impedance of 95 Ω at IZ = 5 mA and 2200 Ω at IZK = 250 μA reflects stable regulation across operating current range.
It features a maximum junction temperature of +200°C and storage temperature down to –65°C, with forward voltage limited to 1.2 V max at 200 mA, enabling bidirectional use in clamping and reference applications where low forward drop and tight voltage tolerance are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.3 V nominal, min 3.135 V / max 3.465 V at 5 mA - defines precise clamping threshold for 3.3 V rail protection |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum steady-state power handling on PCB with standard lead length |
| Zener Impedance (ZZ) | 95 Ω @ IZ = 5 mA - indicates low dynamic resistance for stable regulation under small-signal load variation |
| Leakage Current (IR) | 25 μA @ VR = 1 V - ensures minimal parasitic current draw in high-impedance bias networks |
| Max Zener Current (IZM) | 152 mA - derived from VZ and PD, defines absolute DC current limit before thermal runaway |
| 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 with no internal connections beyond anode and cathode leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; reverse-biased operation requires cathode at higher potential |
| Cathode | Zener breakdown terminal / voltage reference output | Marked with color band; supplies regulated 3.3 V when reverse biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Ensures predictable clamping within 0.165 V of nominal 3.3 V, critical for 3.3 V logic interface protection |
| Low zener impedance (95 Ω) | Maintains <1% output deviation under ±1 mA load change, supporting stable reference in sensor biasing |
| DO-35 glass package | Enables high-reliability hermetic sealing and compatibility with wave soldering at 260°C peak |
| 25 μA leakage @ 1 V | Minimizes error in high-impedance voltage divider networks used in ADC reference scaling |
Applications
| Voltage Reference for Analog Sensors | 3.3 V Rail Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) and bridge-based pressure sensors in industrial transmitters. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference source replacing precision shunt regulators in space-constrained designs. Use Value: Delivers 3.3 V ±0.165 V with <0.5% drift over –40°C to +85°C ambient, reducing calibration burden in field-deployed instruments. |
Use Scenario: Protecting 3.3 V microcontroller I/O pins and ADC inputs from ESD and transient overvoltage events. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between signal line and 3.3 V rail or ground. Use Value: Limits voltage excursion to ≤3.465 V during fast transients, preventing latch-up while drawing <25 μA during normal operation. |
| Low-Power Battery Monitor Threshold | Programmable Logic Supply Clamp |
Use Scenario: Detecting end-of-life battery voltage in coin-cell-powered IoT nodes using comparator input referencing. IC Role / Device Role / Timing Role: Precision threshold generator feeding non-inverting input of ultra-low-power comparator. Use Value: Enables accurate 3.3 V detection with <10 mV hysteresis margin, extending usable battery life by avoiding premature shutdown. |
Use Scenario: Stabilizing configuration voltage for FPGA bank I/Os or CPLD VCCIO rails subject to supply ripple. IC Role / Device Role / Timing Role: Shunt regulator maintaining clean 3.3 V reference for programmable logic I/O voltage setting. Use Value: Suppresses >100 mV ripple peaks to <50 mV, ensuring reliable LVCMOS18/LVCMOS25 level translation without timing skew. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A | Same 3.3 V nominal rating but ±5% tolerance, 1.0 W power rating, DO-41 package | Higher power handling supports 3× current but requires larger board area and different thermal layout | Select when >500 mW dissipation or enhanced surge capability is required; not drop-in due to DO-41 footprint |
| BZX55-C3V3 | 3.3 V ±5%, 500 mW, DO-35, but typical ZZ = 90 Ω vs. 95 Ω and IR = 5 μA @ 1 V vs. 25 μA | Lower leakage improves high-Z bias networks; tighter ZZ offers marginally better regulation | Prefer for ultra-low-leakage analog references; verify compatibility with existing DO-35 land pattern and thermal profile |
Compared with 1N5988B_T50A, 1N4728A provides higher power headroom in a larger package, while BZX55-C3V3 delivers lower leakage and marginally better impedance at the cost of different manufacturer qualification and traceability-both require validation against thermal and layout constraints.
Availability
1N5988B_T50A is available at Aetrix Electronics and suitable for voltage reference, overvoltage clamp, and low-power battery monitoring applications requiring stable component supply, consistent parametric performance, and long-term obsolescence management.
Supply support for 1N5988B_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; its legacy products remain widely deployed in industrial and automotive systems.
The 1N5988B_T50A belongs to Fairchild's 1N59xxB Zener diode family, designed specifically for general-purpose voltage regulation and transient suppression in cost-sensitive, high-reliability linear power and signal conditioning circuits.
FAQ
What is the exact zener voltage tolerance for 1N5988B_T50A?
The 1N5988B_T50A has a guaranteed zener voltage tolerance of ±5% around its nominal 3.3 V rating, meaning the actual VZ falls between 3.135 V and 3.465 V when measured at 5 mA test current and thermal equilibrium conditions. This tolerance is specified in the official Fairchild datasheet Rev. C2 and applies directly to the 1N5988B_T50A part number.
Does 1N5988B_T50A support surface-mount assembly?
No, the 1N5988B_T50A uses a DO-35 glass axial package with radial leads and is intended for through-hole mounting only. It is not compatible with reflow or wave soldering processes designed for SMD components. The 1N5988B_T50A requires manual or automated axial insertion and lead trimming prior to soldering.
What is the maximum allowable junction temperature for 1N5988B_T50A?
The 1N5988B_T50A has a maximum junction temperature (TJ) rating of +200°C, as specified in the Absolute Maximum Ratings table of the Fairchild datasheet. This allows operation in high-temperature environments such as automotive engine compartments or industrial control enclosures, provided PCB thermal design maintains junction-to-ambient thermal resistance within limits.
How does the 1N5988B_T50A perform under low-current bias conditions?
At low currents near knee voltage, the 1N5988B_T50A exhibits a zener impedance of 2200 Ω at IZK = 250 μA, resulting in higher dynamic resistance and reduced regulation accuracy. For stable reference use below 1 mA, the 1N5988B_T50A should be operated above 2 mA to stay within its specified 95 Ω impedance region and avoid excessive voltage drift.
Is the 1N5988B_T50A RoHS compliant?
Yes, the 1N5988B_T50A is RoHS compliant per the original Fairchild Semiconductor product documentation and conforms to EU Directive 2011/65/EU. Lead content is restricted to <1000 ppm, and all six RoHS substances are within allowable limits, verified through material declarations and supplier certifications applicable to the 1N5988B_T50A manufacturing lot.
1N5988B_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):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 25 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
1N5988B_T50A FAQ
1.How can I place an order for 1N5988B_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5988B_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 1N5988B_T50A reliable?
The price and inventory of 1N5988B_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5988B_T50A is usually 5 days.
3.What payment methods are accepted for 1N5988B_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5988B_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5988B_T50A?
1N5988B_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5988B_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 1N5988B_T50A?
For technical support, including 1N5988B_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5988B_T50A requirements.
6.How does Aetrix verify that 1N5988B_T50A is sourced from the original manufacturer or authorized distributors?
All 1N5988B_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 1N5988B_T50A meets industry standards.
7.What is the process for return or replacement of 1N5988B_T50A?
All 1N5988B_T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5988B_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 1N5988B_T50A part is unused and in its original packaging.
Return procedure for 1N5988B_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5988B_T50A Tags
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