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onsemi 1N4738ATA
- Part No.:
- 1N4738ATA
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4738ATA.pdf
- Description:
- DIODE ZENER 8.2V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:34,900
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Product details
Overview
1N4738ATA from ON Semiconductor is a 1 W, 8.2 V ±5% Zener voltage regulator diode in a DO-41 (DO-204AL) hermetically sealed glass package, rated for –65°C to +200°C operation, with 31 Ω maximum zener impedance at 4.5 mA test current and 0.5 µA max leakage at 6.56 V reverse bias. It delivers stable reference voltage in low-power analog power supplies and overvoltage protection circuits.
For engineers reviewing the 1N4738ATA datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, thermal behavior, JEDEC-compliant packaging details, and real-world selection guidance for voltage reference and clamping use cases.
Technical Context
The 1N4738ATA uses an oxide-passivated silicon junction with metallurgical bonded double-slug construction, enabling robust ESD immunity (>16 kV HBM) and stable regulation under transient stress. Its zener voltage is guaranteed at 30°C lead temperature (3/8″ from case) for 90 seconds per JEDEC measurement protocol.
Thermal resistance from junction to lead (θJL) varies with lead length-e.g., ~100°C/W at 1/8″ and ~30°C/W at 1″-and its temperature coefficient is +4.5 mV/°C near 8.2 V, confirmed by Figure 2 of the datasheet across –55°C to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.79–8.61 V @ IZT = 4.5 mA; ensures precise 8.2 V nominal reference under standard test conditions |
| Power Dissipation (PD) | 1.0 W @ TL ≤ 50°C; derates linearly to zero at 150°C ambient with 3/8″ lead length |
| Zener Impedance (ZZT) | 31 Ω max @ IZT = 4.5 mA; defines AC regulation sensitivity to load current changes |
| Leakage Current (IR) | 0.5 µA max @ VR = 6.56 V; guarantees minimal error current in high-impedance bias networks |
| Surge Current (IR) | 550 mA non-repetitive peak @ 1/120 s pulse; supports transient overvoltage clamping without degradation |
| ESD Rating | Class 3 (>16 kV) per Human Body Model; enables direct handling in unshielded assembly environments |
| Operating Temperature | –65°C to +200°C; validated for aerospace, downhole, and industrial control applications |
Pinout & Package
Package: DO-41 (DO-204AL), axial-lead, hermetically sealed glass case with cathode band marking. Double-slug metallurgical construction ensures mechanical stability and thermal reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; establishes reference polarity for regulation |
| Cathode | Zener breakdown terminal / Voltage reference output | Provides regulated 8.2 V output when reverse-biased; marked by color band on glass body |
Key Features
| Feature | Design Value |
|---|---|
| Oxide-passivated junction | Enables stable long-term VZ drift < 0.1%/1000 hrs and low noise in precision references |
| Hermetic glass sealing | Prevents moisture ingress and corrosion in humid or chemically aggressive environments |
| Double-slug construction | Improves thermal coupling to PCB traces or heatsinks, reducing θJL by up to 40% vs. single-slug alternatives |
| JEDEC-standard DO-41 footprint | Ensures compatibility with legacy through-hole assembly lines and automated optical inspection (AOI) |
| ±5% VZ tolerance | Meets cost-sensitive industrial and consumer-grade voltage reference requirements without trimming |
Applications
| Low-Voltage Power Supply Reference | Overvoltage Clamp for Microcontroller I/O |
|---|---|
Use Scenario: Providing stable 8.2 V reference for op-amp feedback networks in 12 V DC-DC converter feedback loops. IC Role / Device Role / Timing Role: Zener diode acts as passive voltage reference source, setting output regulation point independent of load variation. Use Value: Delivers <1% output error over –40°C to +85°C due to predictable +4.5 mV/°C tempco and low ZZT. | Use Scenario: Protecting 5 V-tolerant GPIO pins from accidental 12 V miswiring in automotive body control modules. IC Role / Device Role / Timing Role: Functions as shunt clamp, diverting excess current above 8.61 V to ground before IC damage occurs. Use Value: Withstands 550 mA non-repetitive surge and 0.5 µA leakage at 6.56 V, minimizing standby power loss. |
| Temperature-Stable Sensor Biasing | Legacy Equipment Voltage Calibration |
Use Scenario: Biasing thermistor or RTD bridges in industrial temperature transmitters requiring <0.5% full-scale accuracy. IC Role / Device Role / Timing Role: Supplies excitation voltage with minimal self-heating and known tempco compensation path. Use Value: Oxide-passivated junction ensures <0.05% VZ shift over 10-year field life, critical for metrology-grade calibration. | Use Scenario: Replacing obsolete zeners in 1990s-era oscilloscopes and signal generators during repair or refurbishment. IC Role / Device Role / Timing Role: Drop-in replacement for original 1N4738A in service manuals, maintaining identical electrical and mechanical fit. Use Value: Identical DO-41 footprint, ±5% tolerance, and 1 W rating ensure no PCB or firmware changes required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4738A | No ammo-pack packaging; same electrical specs, DO-41 package, and ±5% VZ tolerance | Identical performance but supplied in bulk box (2000 units), not ammo pack | Select 1N4738A for manual prototyping or low-volume hand-soldering where tape-and-reel is unnecessary |
| BZX55-C8V2 | Same 8.2 V nominal, ±5% tolerance, but in DO-35 package; 500 mW power rating vs. 1 W | Lower power dissipation limits use in <500 mW continuous clamp or reference roles | Choose BZX55-C8V2 only when board space is constrained and thermal budget permits reduced power handling |
Compared with 1N4738A and BZX55-C8V2, the 1N4738ATA offers identical regulation performance with optimized logistics for automated SMT placement via 4000-unit ammo pack, while retaining full 1 W capability and hermetic reliability unmatched by smaller DO-35 alternatives.
Availability
1N4738ATA is available at Aetrix Electronics and suitable for low-power voltage reference, overvoltage protection, and sensor biasing applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 1N4738ATA 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 supplier delivering energy-efficient, high-performance silicon solutions for automotive, industrial, cloud computing, and IoT applications.
The 1N47xxA series was designed specifically for cost-effective, high-reliability Zener regulation in general-purpose analog circuits-emphasizing hermetic integrity, JEDEC compliance, and wide-temperature operation without trimming.
FAQ
What is the exact zener voltage range specified for the 1N4738ATA?
The 1N4738ATA has a guaranteed zener voltage range of 7.79 V to 8.61 V at 4.5 mA test current (IZT), corresponding to a nominal 8.2 V ±5% tolerance per JEDEC standard. This range is measured at 30°C lead temperature, 3/8″ from the diode body, for 90 seconds-ensuring repeatability across production lots and alignment with legacy 1N4738A specifications.
Does the 1N4738ATA support high-temperature operation in industrial environments?
Yes, the 1N4738ATA is rated for operation from –65°C to +200°C junction temperature, validated per the manufacturer's thermal characterization data. Its oxide-passivated junction and hermetic glass package maintain stable VZ and low leakage even at 150°C ambient, making it suitable for engine control units, downhole sensors, and enclosed industrial power supplies where thermal management is limited.
How does the 1N4738ATA differ from the 1N4738A in terms of packaging and logistics?
The 1N4738ATA is identical electrically and mechanically to the 1N4738A but shipped in 4000-unit ammo packs optimized for automated pick-and-place systems. The base 1N4738A is supplied in 2000-unit boxes. Both share DO-41 packaging, ±5% VZ tolerance, and 1 W power rating-so the "TA" suffix reflects only packaging format, not performance or reliability differences.
Can the 1N4738ATA be used as a direct replacement for older 1N4738 devices in legacy designs?
Yes, the 1N4738ATA is a JEDEC-registered, drop-in replacement for earlier 1N4738 variants, including those manufactured before 2000. It maintains identical pinout, DO-41 footprint, voltage regulation characteristics, and thermal derating curve-confirmed by ON Semiconductor's preferred-device designation and cross-reference documentation in Publication 1N4728A/D Rev. 1.
What is the maximum non-repetitive surge current rating for the 1N4738ATA?
The 1N4738ATA supports a maximum non-repetitive reverse surge current of 550 mA for a 1/120 second pulse (equivalent to 8.33 ms), as specified in the Electrical Characteristics table. This rating applies when superimposed on the 4.5 mA zener test current and is validated per JEDEC registration-enabling reliable transient suppression in 12 V automotive and industrial bus protection circuits.
1N4738ATA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 8.2 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 4.5 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 6 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 200°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
1N4738ATA FAQ
1.How can I place an order for 1N4738ATA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4738ATA 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 1N4738ATA reliable?
The price and inventory of 1N4738ATA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4738ATA is usually 5 days.
3.What payment methods are accepted for 1N4738ATA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4738ATA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4738ATA?
1N4738ATA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4738ATA 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 1N4738ATA?
For technical support, including 1N4738ATA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4738ATA requirements.
6.How does Aetrix verify that 1N4738ATA is sourced from the original manufacturer or authorized distributors?
All 1N4738ATA 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 1N4738ATA meets industry standards.
7.What is the process for return or replacement of 1N4738ATA?
All 1N4738ATA units undergo pre-shipment inspection (PSI). If there is an issue with 1N4738ATA, 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 1N4738ATA part is unused and in its original packaging.
Return procedure for 1N4738ATA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4738ATA Tags
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