My Inquiry
My Account
onsemi 1N5988B_T50R
- Part No.:
- 1N5988B_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5988B_T50R.pdf
- Description:
- DIODE ZENER 3.3V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:7,353
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5988B_T50R 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_T50R 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
This device operates as a two-terminal voltage regulator with stable reverse breakdown at 3.3 V nominal, specified under thermal equilibrium conditions (TL = 30°C ± 1°C, 3/8″ lead length). Its zener impedance of 95 Ω at 5 mA test current ensures predictable regulation under light load variations.
The 1N5988B_T50R exhibits low leakage (25 μA max at 1 V reverse bias) and high dynamic impedance in knee region (2200 Ω @ 250 μA), supporting accurate clamping in signal conditioning and reference circuits where stability at low currents matters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.3 V nominal, min 3.135 V / max 3.465 V - defines precise clamping threshold for 3.3 V rail protection |
| Tolerance | ±5% - guarantees voltage accuracy within 165 mV of nominal, critical for reference stability |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous power handling before thermal derating begins |
| Zener Impedance (ZZ) | 95 Ω @ IZ = 5 mA - determines output voltage variation under load current changes |
| Leakage Current (IR) | 25 μA @ VR = 1 V - ensures minimal parasitic current draw in standby or high-impedance nodes |
| Max Zener Current (IZM) | 152 mA - derived from PD and VZ, limits peak surge capability without exceeding junction temperature |
| 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 external biasing or control signals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to circuit common; forward voltage ≤ 1.2 V @ 200 mA enables use as low-drop rectifier if needed |
| Cathode | Zener breakdown terminal / regulated output node | Connected to voltage rail being clamped; reverse-biased operation delivers stable 3.3 V reference |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables direct replacement in 3.3 V reference designs without recalibration or resistor trimming |
| 95 Ω dynamic impedance @ 5 mA | Minimizes output voltage shift under ±1 mA load variation, improving ADC reference stability |
| 25 μA leakage @ 1 V reverse bias | Reduces error contribution in high-impedance sensor bias networks and battery-monitoring dividers |
| DO-35 glass package with 3/8″ lead length spec | Ensures consistent thermal resistance (RθJL) for repeatable power derating across production lots |
Applications
| Microcontroller Voltage Reference | USB Interface Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 3.3 V reference for internal ADC and brown-out detection in low-cost 8-bit MCUs. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to generate fixed reference voltage independent of supply ripple. Use Value: ±5% tolerance and 95 Ω impedance maintain reference accuracy within 0.5 LSB for 10-bit ADCs under varying load conditions. |
Use Scenario: Clamping D+ and D− lines to 3.3 V against ESD transients during USB 2.0 hot-plug events. IC Role / Device Role / Timing Role: Two-terminal transient voltage suppressor absorbing >1 kV HBM spikes while limiting line voltage to safe levels. Use Value: 25 μA leakage avoids signal integrity degradation on 480 Mbps differential data lines; DO-35 allows compact board placement near connectors. |
| Industrial Sensor Signal Conditioning | Low-Power Battery Monitor Divider |
Use Scenario: Biasing op-amp input stages and setting gain in 4–20 mA transmitter front-ends. IC Role / Device Role / Timing Role: Precision shunt regulator establishing known DC offset and common-mode level for instrumentation amplifiers. Use Value: Low 2200 Ω knee impedance ensures stable bias point even when sourcing <100 μA into high-Z amplifier inputs. |
Use Scenario: Scaling lithium-ion battery voltage (2.5–4.2 V) to 0–3.3 V range for microcontroller ADC input. IC Role / Device Role / Timing Role: Zener-based voltage clamp protecting ADC input from overvoltage during cell imbalance or charger fault. Use Value: 3.3 V clamping threshold matches MCU IO rail; 500 mW rating handles brief 100 ms overvoltage surges without failure. |
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%, but higher ZZ = 100 Ω @ 76 mA; different test current and thermal profile | Designed for higher-current regulation (76 mA vs. 5 mA), less suitable for low-power reference use | Select 1N5988B_T50R when low-test-current impedance and tight thermal spec (3/8″ lead) are required |
| BZX55-C3V3 | 3.3 V nominal, ±5%, but ZZ = 95 Ω @ 5 mA - identical regulation spec, yet TO-92 package offers higher PD (500 mW same, but better heatsinking) | TO-92 allows higher ambient temperature operation; not DO-35 drop-in due to footprint and lead form | Choose BZX55-C3V3 only if board layout permits TO-92 and thermal margin exceeds DO-35 constraints |
Compared with 1N4728A and BZX55-C3V3, the 1N5988B_T50R provides optimal balance of low-current regulation fidelity, DO-35 compatibility for legacy through-hole designs, and guaranteed thermal performance at 3/8″ lead length - making it preferred for space-constrained, low-power analog references.
Availability
1N5988B_T50R is available at Aetrix Electronics and suitable for microcontroller reference design, USB interface protection, and industrial sensor signal conditioning requiring stable component supply and long-term obsolescence management.
Supply support for 1N5988B_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 diodes remain widely deployed in industrial and automotive systems.
The 1N5985B–1N6025B series was designed specifically for general-purpose voltage regulation and transient suppression in cost-sensitive, high-reliability through-hole applications - emphasizing tight tolerance, repeatable thermal behavior, and glass-package robustness.
FAQ
What is the exact zener voltage range for 1N5988B_T50R at 25°C?
The 1N5988B_T50R has a guaranteed zener voltage range of 3.135 V (minimum) to 3.465 V (maximum) at 25°C, measured with 5 mA test current and thermal equilibrium at 30°C ± 1°C lead temperature. This 3.3 V nominal value with ±5% tolerance is confirmed in the Fairchild Rev. C2 datasheet Table 1.
Does 1N5988B_T50R support surface-mount assembly?
No, the 1N5988B_T50R uses a DO-35 glass axial package with radial leads intended for through-hole mounting. It is not compatible with reflow or wave soldering processes designed for SMD components. For SMT alternatives, consider SOD-123 or SOD-323 packaged Zeners with equivalent electrical specs.
What is the maximum allowable junction temperature for 1N5988B_T50R?
The 1N5988B_T50R has an operating junction temperature range of –65°C to +200°C per the Absolute Maximum Ratings table. However, sustained operation above +150°C requires derating power dissipation per the 4.0 mW/°C curve, and thermal design must ensure TJ stays within this limit under worst-case ambient and power conditions.
How does the 3/8″ lead length specification affect 1N5988B_T50R thermal performance?
The 3/8″ lead length is a defined thermal test condition for measuring power dissipation and derating. It establishes a standardized thermal resistance path (RθJL) from junction to lead; deviations from this length alter heat transfer and invalidate the published 500 mW rating and 4.0 mW/°C derating curve for the 1N5988B_T50R.
Is forward voltage specified for 1N5988B_T50R, and what is its value?
Yes, the forward voltage for 1N5988B_T50R is specified as ≤1.2 V at IF = 200 mA, per the "VF Forward Voltage" note on page 3 of the datasheet. This parameter confirms usability in low-voltage rectification or polarity protection roles where forward conduction is required alongside Zener regulation.
1N5988B_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):
- 3.3 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_T50R FAQ
1.How can I place an order for 1N5988B_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5988B_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 1N5988B_T50R reliable?
The price and inventory of 1N5988B_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5988B_T50R is usually 5 days.
3.What payment methods are accepted for 1N5988B_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5988B_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5988B_T50R?
1N5988B_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5988B_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 1N5988B_T50R?
For technical support, including 1N5988B_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5988B_T50R requirements.
6.How does Aetrix verify that 1N5988B_T50R is sourced from the original manufacturer or authorized distributors?
All 1N5988B_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 1N5988B_T50R meets industry standards.
7.What is the process for return or replacement of 1N5988B_T50R?
All 1N5988B_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N5988B_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 1N5988B_T50R part is unused and in its original packaging.
Return procedure for 1N5988B_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5988B_T50R Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
