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Microchip Technology 1N4738APE3/TR12
- Part No.:
- 1N4738APE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4738APE3/TR12.pdf
- Description:
- DIODE ZENER 8.2V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:4,531
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Product details
Overview
1N4738APE3/TR12 from Microsemi is a 1.0 W, 8.2 V ±5% axial-lead Zener diode in DO-41 plastic package, rated for -65°C to +150°C operation, with 31 mA test current, 4.5 Ω dynamic impedance at IZT, and 6 µA reverse leakage at 6.6 V. It provides stable voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4738APE3/TR12 datasheet, 1N4738APE3/TR12 pinout, 1N4738APE3/TR12 application, or 1N4738APE3/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (45°C/W junction-to-lead), surge current rating (500 mA), RoHS-compliant matte-tin plating, and tape-and-reel packaging (TR12).
Technical Context
This device operates in reverse breakdown to maintain a stable 8.2 V reference across a wide current range (0.25–500 mA), with low dynamic impedance ensuring minimal voltage variation under load transients. Its DO-41 plastic encapsulation delivers lower thermal resistance than glass-body variants and meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity without dry pack.
The 1N4738APE3/TR12 features a cathode band marking, 1.2 V forward voltage max at 200 mA, and is rated for 260°C soldering (10 s). It supports industrial and automotive power rail stabilization where ±5% initial tolerance and -65°C to +150°C operating range are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.2 V ±5% at 31 mA - defines precise regulation point for feedback loops and reference rails |
| Power Dissipation | 1.0 W at 25°C lead temperature - sets maximum continuous DC power handling before derating |
| Dynamic Impedance (ZZT) | 4.5 Ω at 31 mA - determines output voltage stability under varying load current |
| Reverse Leakage Current | 6 µA at 6.6 V - ensures low standby power loss in high-impedance bias networks |
| Surge Current (ISM) | 500 mA (½-sine, 1/120 s) - enables transient overvoltage clamping without failure |
| Thermal Resistance | 45°C/W junction-to-lead (3/8″ lead length) - informs heatsinking requirements for sustained operation |
| Operating Temperature | -65°C to +150°C - supports deployment in under-hood, industrial, and aerospace environments |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by a single band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; forward conduction path when biased positive relative to cathode |
| Cathode | Banded end | Connected to higher-potential node during Zener operation; regulates voltage referenced to this terminal |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with standardized 1N47xxA series electrical and mechanical specifications for interchangeability |
| RoHS-compliant "e3" suffix | Matte-tin plating meets EU RoHS Directive 2011/65/EU and JEDEC J-STD-609A Class 3 |
| Tape-and-reel packaging | TR12 designation indicates EIA-296 standard 12 mm tape, enabling automated SMT placement despite axial form factor |
| Level 1 moisture sensitivity | No dry pack or baking required prior to assembly - reduces manufacturing overhead and floor-life constraints |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for special ESD handling in production |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or discrete transistor-based regulators. IC Role / Device Role / Timing Role: Provides precise 8.2 V reference to error amplifier input, enabling accurate output voltage setpoint. Use Value: Maintains ±5% regulation accuracy across -65°C to +150°C, reducing calibration drift in unregulated supplies. | Use Scenario: Clamping transient spikes on 12 V automotive or industrial control bus lines. IC Role / Device Role / Timing Role: Acts as shunt protector by conducting excess current above 8.2 V, diverting energy from sensitive downstream circuitry. Use Value: Withstands 500 mA surge (½-sine, 1/120 s), preventing latch-up or damage during load dump events. |
| Voltage Monitor Threshold | Signal Level Translation |
Use Scenario: Detecting undervoltage or overvoltage conditions in battery-powered instrumentation. IC Role / Device Role / Timing Role: Serves as precision threshold element in comparator input networks for brown-out detection. Use Value: Low 6 µA leakage at 6.6 V ensures minimal loading on high-impedance sensing nodes, preserving measurement integrity. | Use Scenario: Biasing logic-level shifters or interfacing 5 V microcontrollers with 8.2 V analog subsystems. IC Role / Device Role / Timing Role: Establishes stable 8.2 V clamp point to limit signal swing and protect input stages. Use Value: 4.5 Ω dynamic impedance ensures fast response to signal overshoot, minimizing distortion in level-shifted waveforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4738A | No "e3" RoHS suffix; Sn/Pb plating; TR12 not specified | Limited to non-RoHS-compliant legacy production; no tape-and-reel assurance | Select only if RoHS exemption applies and manual placement is acceptable |
| MMSZ4704T1G | Surface-mount SOD-123; 8.2 V ±5%; 500 mW rating; 30 mA IZT | Lower power (0.5 W); unsuitable for sustained 1 W dissipation; requires PCB layout change | Choose for space-constrained designs where thermal budget allows derated operation |
Compared with 1N4738A and MMSZ4704T1G, the 1N4738APE3/TR12 uniquely combines full 1 W power handling, RoHS compliance, and EIA-296 tape-and-reel packaging in a JEDEC-standard axial package-enabling drop-in replacement in legacy through-hole lines while meeting modern environmental and automation requirements.
Availability
1N4738APE3/TR12 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and voltage monitor threshold applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for 1N4738APE3/TR12 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
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N47xxAP series was designed to deliver JEDEC-standard, high-stability Zener regulation in ruggedized plastic packages for mission-critical power conditioning and protection functions.
FAQ
What is the Zener voltage tolerance of the 1N4738APE3/TR12?
The 1N4738APE3/TR12 has a nominal Zener voltage of 8.2 V with a tolerance of ±5%, as indicated by the "A" suffix in the part number per JEDEC registration. This tolerance is measured at 31 mA test current and 25°C lead temperature, and remains valid across its full operating temperature range of -65°C to +150°C.
Does the 1N4738APE3/TR12 require dry packing before reflow soldering?
No, the 1N4738APE3/TR12 does not require dry packing. It is moisture sensitivity level (MSL) 1 per IPC/JEDEC J-STD-020B, meaning it can be stored indefinitely at ambient conditions without baking or desiccant packaging prior to assembly.
What is the maximum surge current rating for the 1N4738APE3/TR12?
The 1N4738APE3/TR12 is rated for a maximum non-repetitive surge current (ISM) of 500 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25°C ambient. This rating supports transient clamping in automotive load-dump and inductive-switching scenarios.
How is polarity marked on the 1N4738APE3/TR12?
The 1N4738APE3/TR12 uses a single cathode band to indicate polarity. The banded end is the cathode and must be held at a higher potential than the anode (non-banded end) for proper Zener regulation. Forward conduction occurs when the anode is biased positive relative to the cathode.
Is the 1N4738APE3/TR12 compatible with lead-free reflow processes?
Yes, the 1N4738APE3/TR12 is RoHS-compliant with an "e3" suffix, indicating annealed matte-tin plating qualified for lead-free soldering at 260°C for up to 10 seconds. Its DO-41 plastic body meets UL94V-0 flammability rating and withstands standard reflow thermal profiles without delamination or marking loss.
1N4738APE3/TR12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- 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:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
1N4738APE3/TR12 FAQ
1.How can I place an order for 1N4738APE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4738APE3/TR12 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 1N4738APE3/TR12 reliable?
The price and inventory of 1N4738APE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4738APE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4738APE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4738APE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4738APE3/TR12?
1N4738APE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4738APE3/TR12 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 1N4738APE3/TR12?
For technical support, including 1N4738APE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4738APE3/TR12 requirements.
6.How does Aetrix verify that 1N4738APE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4738APE3/TR12 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 1N4738APE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4738APE3/TR12?
All 1N4738APE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4738APE3/TR12, 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 1N4738APE3/TR12 part is unused and in its original packaging.
Return procedure for 1N4738APE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4738APE3/TR12 Tags
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