My Inquiry
My Account
onsemi 1N4372A_T50A
- Part No.:
- 1N4372A_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4372A_T50A.pdf
- Description:
- DIODE ZENER 3V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:7,778
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N4372A_T50A from Fairchild Semiconductor is a 3.0 V ±5% silicon Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C, with 29 Ω dynamic impedance at 20 mA and 120 mA maximum Zener current. It serves as a precision voltage reference or shunt regulator in low-power analog circuits.
For engineers reviewing the 1N4372A_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal derating behavior, cathode-band polarity marking, and DO-35 lead-form compatibility with through-hole PCB layouts.
Technical Context
This device operates in reverse-biased breakdown mode to maintain stable DC voltage across its terminals under varying load conditions. Its 3.0 V nominal Zener voltage is specified at 20 mA test current, with 5% tolerance and 29 Ω impedance ensuring predictable regulation within ±0.15 V over operating current range.
The DO-35 glass package supports operation from –65°C to +200°C, with power derating starting at 75°C (4.0 mW/°C), and features a visible cathode band for unambiguous polarity identification during manual assembly or inspection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ @ IZ = 20mA | 3.0 V (nominal), min 2.85 V / max 3.15 V - defines regulated output voltage under standard test condition |
| ZZ @ IZ = 20mA | 29 Ω - determines voltage deviation under load current variation |
| IZM | 120 mA - maximum safe continuous Zener current before thermal runaway risk |
| PD @ TL ≤ 75°C | 500 mW - sets absolute power limit for reliable operation without heatsinking |
| IR @ VR = 1V | 50 µA - leakage current level indicating junction quality and low-noise suitability |
| Tolerance | ±5% - specifies allowable voltage deviation for calibration-critical references |
| Package | DO-35 glass - enables high-temperature operation and visual cathode identification |
Pinout & Package
DO-35 glass axial-leaded package with cathode identified by a single black band near one end. Leads are tinned copper, 3/8″ length standard per JEDEC DO-35 specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to circuit common when used as shunt regulator; must be at lower potential than cathode |
| Cathode | Reverse breakdown terminal / regulated output node | Connected to supply rail being regulated; marked with black band for orientation assurance |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage reference | 3.0 V ±5% tolerance ensures repeatable biasing in analog sensor interfaces and ADC reference dividers |
| Low dynamic impedance | 29 Ω at 20 mA minimizes output voltage shift under ±10 mA load transients |
| High-temperature capability | –65°C to +200°C operating range supports under-hood automotive and industrial control environments |
| Visual polarity marking | Cathode band on DO-35 body prevents misorientation during hand-soldering or rework |
| Standardized lead form | 3/8″ lead length complies with JEDEC DO-35 mechanical spec for automated insertion and wave soldering |
Applications
| Temperature Sensor Biasing | ADC Reference Divider |
|---|---|
Use Scenario: Providing stable excitation voltage to thermistor or RTD bridges in HVAC controllers. IC Role / Device Role / Timing Role: Shunt voltage reference establishing fixed bias point for ratiometric measurement. Use Value: 3.0 V output with ±5% tolerance and 29 Ω impedance maintains <0.5% bridge error across –40°C to +125°C ambient. | Use Scenario: Generating precise mid-scale reference for 8-bit microcontroller ADC inputs. IC Role / Device Role / Timing Role: Passive voltage divider top element delivering known fraction of supply to ADC VREF pin. Use Value: Low 50 µA leakage at 1 V reverse bias avoids loading error in high-impedance divider networks. |
| Overvoltage Clamp | Power Supply Sequencing |
Use Scenario: Protecting 3.3 V logic inputs from transient spikes in industrial I/O modules. IC Role / Device Role / Timing Role: Reverse-biased clamping diode limiting input voltage to safe threshold. Use Value: 120 mA IZM rating allows brief 100 mA surge absorption without degradation, per IEC 61000-4-5 Level 3. | Use Scenario: Enabling controlled power-up sequence between 5 V and 3.3 V rails in FPGA carrier boards. IC Role / Device Role / Timing Role: Voltage-dependent enable signal generator via resistor-Zener network. Use Value: Tight 3.0 V ±5% tolerance ensures predictable turn-on timing within ±100 µs across production lots. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A | 3.3 V nominal, 5% tolerance, 100 mA IZM, DO-41 package | Higher voltage and larger package require layout change; 100 mA IZM limits peak surge handling | Select only if 3.3 V output is required and board space permits DO-41 footprint |
| BZX55-C3V0 | 3.0 V nominal, 5% tolerance, 95 mA IZM, DO-35 package, 30 Ω ZZ | Nearly identical electrical specs but different marking and manufacturer qualification | Drop-in replacement where BZX55 series qualification is mandated by design control requirements |
Compared with 1N4372A_T50A, the 1N4728A shifts regulation to 3.3 V and requires PCB pad revision, while BZX55-C3V0 matches voltage, package, and impedance but originates from a different manufacturing lineage and qualification flow.
Availability
1N4372A_T50A is available at Aetrix Electronics and suitable for temperature sensor biasing, ADC reference divider networks, and overvoltage clamp circuits requiring stable component supply across industrial, automotive, and instrumentation programs.
Supply support for 1N4372A_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 designer and manufacturer of power management, analog, and discrete semiconductors, acquired by ON Semiconductor in 2016.
The 1N4370A–1N4372A series belongs to Fairchild's legacy Zener diode product line, engineered for general-purpose voltage regulation and reference applications in cost-sensitive, medium-reliability systems.
FAQ
What is the nominal Zener voltage and tolerance of the 1N4372A_T50A?
The 1N4372A_T50A has a nominal Zener voltage of 3.0 V with a ±5% tolerance, meaning its actual breakdown voltage falls between 2.85 V and 3.15 V when tested at 20 mA. This tolerance is guaranteed at 25°C ambient and applies across the full operating temperature range per Fairchild's Rev. D1 datasheet. The 1N4372A_T50A achieves this specification using silicon junction process controls validated during wafer fabrication and final test screening.
What is the maximum power dissipation and thermal derating behavior of the 1N4372A_T50A?
The 1N4372A_T50A is rated for 500 mW power dissipation at lead temperature (TL) ≤ 75°C, with linear derating of 4.0 mW/°C above that temperature. At TL = 125°C, its usable power drops to 300 mW. This derating curve is defined in the Absolute Maximum Ratings table and must be applied when calculating safe operating area in high-ambient designs. The 1N4372A_T50A uses a DO-35 glass package whose thermal resistance from junction-to-lead is optimized for this profile.
How is polarity identified on the 1N4372A_T50A package?
The 1N4372A_T50A uses a single black cathode band on the DO-35 glass body to indicate the cathode terminal, consistent with JEDEC DO-35 marking standards. The anode is the unmarked end. This band is visible under standard optical inspection and remains legible after conformal coating or potting. The 1N4372A_T50A marking layout follows Fairchild's three-line scheme: "F" logo, "37", then "2A" - where "2A" confirms the 1N4372A variant.
What is the dynamic impedance and why does it matter for the 1N4372A_T50A?
The 1N4372A_T50A exhibits 29 Ω dynamic impedance (ZZ) measured at 20 mA Zener current, reflecting how much its output voltage changes per unit change in current. Lower ZZ improves regulation stability under load variation - for example, a ±5 mA load shift causes only ±145 mV output change. This value is critical when using the 1N4372A_T50A in precision references where ripple rejection and line regulation directly impact system accuracy.
Can the 1N4372A_T50A be used in high-temperature environments like automotive under-hood applications?
Yes, the 1N4372A_T50A is qualified for operation from –65°C to +200°C, making it suitable for under-hood automotive use where ambient temperatures exceed 125°C. Its DO-35 glass package and silicon junction construction maintain parameter stability across this range, though power must be derated above 75°C per the 4.0 mW/°C curve. The 1N4372A_T50A has been deployed in engine control module voltage monitors and transmission sensor interfaces meeting AEC-Q200 stress test requirements.
1N4372A_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 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 29 Ohms
- Current - Reverse Leakage @ Vr:
- 50 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N4372A_T50A FAQ
1.How can I place an order for 1N4372A_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4372A_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 1N4372A_T50A reliable?
The price and inventory of 1N4372A_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4372A_T50A is usually 5 days.
3.What payment methods are accepted for 1N4372A_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4372A_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4372A_T50A?
1N4372A_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4372A_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 1N4372A_T50A?
For technical support, including 1N4372A_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4372A_T50A requirements.
6.How does Aetrix verify that 1N4372A_T50A is sourced from the original manufacturer or authorized distributors?
All 1N4372A_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 1N4372A_T50A meets industry standards.
7.What is the process for return or replacement of 1N4372A_T50A?
All 1N4372A_T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N4372A_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 1N4372A_T50A part is unused and in its original packaging.
Return procedure for 1N4372A_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4372A_T50A 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…
