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HomeProductsDiscrete Semiconductor ProductsDiodes - Zener - Single1N4736PE3/TR8
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1N4736PE3/TR8 - Microchip Technology

Manufacturer Part Number
1N4736PE3/TR8
Manufacturer
Microchip Technology
Allelco Part Number
98D-1N4736PE3/TR8
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
29,964 pcs available, New & Original
Parts Description
DIODE ZENER 6.8V 1W DO204AL
Package
DO-204AL (DO-41)
Data sheet
1N4736PE3/TR8.pdf
RoHs Status
ROHS3 Compliant
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In stock: 29964
  • Unit Price: $0.915
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Specifications

1N4736PE3/TR8 Tech Specifications
Microchip Technology - 1N4736PE3/TR8 technical specifications, attributes, parameters and parts with similar specifications to Microchip Technology - 1N4736PE3/TR8

Product Attribute Attribute Value
Manufacturer Microchip Technology
Voltage - Zener (Nom) (Vz) 6.8 V
Voltage - Forward (Vf) (Max) @ If 1.2 V @ 200 mA
Tolerance ±10%
Supplier Device Package DO-204AL (DO-41)
Series -
Power - Max 1 W
Product Attribute Attribute Value
Package / Case DO-204AL, DO-41, Axial
Package Tape & Reel (TR)
Operating Temperature -65°C ~ 150°C
Mounting Type Through Hole
Impedance (Max) (Zzt) 3.5 Ohms
Current - Reverse Leakage @ Vr 10 µA @ 4 V
Base Product Number 1N4736

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99

Frequently Asked Questions(FAQ)

What are the key electrical characteristics of the 1N4736PE3/TR8 Zener diode that determine its suitability for voltage regulation in a 5V microcontroller power supply circuit?
The 1N4736PE3/TR8 provides a stable 6.8 V Zener voltage with ±10% tolerance, which is higher than the 5V target, making it unsuitable as a direct regulator for a 5V system without additional circuitry such as a series resistor and load adjustment. Its maximum power dissipation of 1 W limits the allowable current through the device to approximately 147 mA at nominal Vz (Imax ≈ P/V = 1W / 6.8V). With a dynamic impedance of 3.5 Ohms, the regulation accuracy under load variation is limited; a change of 10 mA in load current could introduce up to 35 mV variation in output voltage, potentially affecting tightly regulated low-voltage systems. Therefore, while capable of handling moderate current loads, it is not ideal for precision 5V regulation and may require careful derating or alternative components like lower-Vz regulators.
How does the thermal performance of the 1N4736PE3/TR8 impact its reliability when used in continuous operation at elevated ambient temperatures?
Operating at high ambient temperatures reduces the effective thermal resistance path from junction to environment, decreasing the device's ability to dissipate heat. The 1N4736PE3/TR8 has an operating temperature range of -65°C to 150°C, but sustained operation near 125–150°C increases the risk of long-term degradation due to reduced carrier mobility and potential metallization migration. Given its 1 W power rating and axial DO-41 package, thermal management relies heavily on PCB trace area and airflow. In confined spaces with limited convection, even modest power dissipation can lead to excessive junction temperatures, accelerating failure mechanisms. Designers must ensure adequate heat sinking or limit duty cycle to maintain junction temperature below 125°C for reliable operation.
Can the 1N4736PE3/TR8 be substituted with the BZX79-B6V8 in a legacy analog circuit requiring precise 6.8 V reference, and what trade-offs should be considered?
The BZX79-B6V8 is a close substitute for the 1N4736PE3/TR8, sharing similar Zener voltage and package type, but differences exist in power rating and tolerance. While both offer ±10% Vz tolerance, the BZX79 typically has a lower power rating (~0.5 W), making it less suitable for applications exceeding 74 mA at 6.8 V. The 1N4736PE3/TR8’s higher power capability and better-defined impedance profile support more robust regulation under transient loads. However, if the design already includes current-limiting resistors or operates well within the BZX79’s limits, substitution may be acceptable. The primary trade-off is reduced power margin and potentially higher sensitivity to load variations due to inferior dynamic characteristics.
What considerations apply when integrating the 1N4736PE3/TR8 into a high-reliability automotive lighting system subject to thermal cycling and vibration?
The 1N4736PE3/TR8’s through-hole DO-41 package offers mechanical robustness but requires secure mounting to withstand vibration. Thermal cycling between -65°C and 150°C stresses solder joints and semiconductor interfaces, increasing the risk of fatigue failure over time. Although the component is RoHS3 compliant and MSL 1-rated, indicating good manufacturing stability, repeated thermal expansion mismatches in the PCB and package can lead to crack propagation at stress concentration points. To mitigate this, use strain relief in lead placement and avoid placing the device near high-stress zones. Additionally, derating the power usage below 0.7 W improves reliability under thermal cycling conditions by reducing junction temperature fluctuations.
How does the reverse leakage current of the 1N4736PE3/TR8 affect precision measurement circuits where small signal integrity is critical?
The 1N4736PE3/TR8 exhibits a reverse leakage current of 10 µA at 4 V reverse bias, which, while low, can become significant in high-impedance or low-current measurement paths. For example, in a voltage divider feeding a sensitive op-amp input, this leakage may cause measurable offset errors or loading effects, especially when monitoring voltages above 4 V. In ultra-precision applications like sensor conditioning or battery-powered data acquisition, even microampere-level leakage can distort readings. While not prohibitive for general-purpose regulation, engineers should evaluate whether the 1N4736PE3/TR8’s leakage contributes to unacceptable error margins, and consider alternatives with lower leakage or implement guard rings in layout design.
When selecting between surface-mount and through-hole versions of 6.8 V Zener diodes, why might the 1N4736PE3/TR8 still be preferred despite newer SMD trends?
The 1N4736PE3/TR8 remains relevant in through-hole applications due to its proven reliability, ease of manual assembly, and compatibility with legacy designs. Its DO-41 package provides strong mechanical stability and excellent heat dissipation via axial leads, allowing efficient thermal conduction to PCB copper planes—advantages often missing in small SMD packages like SOD-323. In industrial control panels or repair scenarios, hand-soldering and prototyping benefits make the 1N4736PE3/TR8 practical despite the industry shift toward automation. Moreover, its standardized pinout and availability in tape-and-reel format for automated insertion streamline hybrid production lines.
What design precautions are necessary when using the 1N4736PE3/TR8 in switching power supply feedback networks to prevent instability?
In switching regulators, the 1N4736PE3/TR8 must be carefully selected based on response speed and noise immunity. Its relatively high dynamic impedance (3.5 Ω) and slower thermal response compared to integrated reference ICs can introduce phase lag in feedback loops, potentially destabilizing control systems. Additionally, Zener noise (Zener flicker noise) at levels around 10–30 nV/√Hz may interfere with low-voltage feedback signals. To mitigate this, ensure sufficient series resistance limits peak current and filter noise with small capacitors across the Zener. Also, verify that transient power handling exceeds expected surge events, as abrupt load changes can momentarily exceed 1 W, causing voltage overshoot and loop desynchronization.
How does the Moisture Sensitivity Level (MSL) of the 1N4736PE3/TR8 influence storage and handling procedures during large-scale PCB assembly?
Classified as MSL 1 (unlimited floor life), the 1N4736PE3/TR8 poses minimal risk from moisture absorption during standard storage conditions. This simplifies logistics and reduces pre-bake requirements before reflow soldering, unlike MSL 2–4 components that may require dry packing or nitrogen reflow. However, despite its classification, prolonged exposure to humid environments (>60% RH) can still degrade solder joint quality over time. Best practice involves storing components in sealed containers with desiccants and monitoring humidity in warehouses. For mass production, the 1N4736PE3/TR8 supports just-in-time inventory strategies without complex handling protocols, enhancing supply chain flexibility.
In what scenarios would the forward voltage drop of the 1N4736PE3/TR8 (1.2 V @ 200 mA) become a limiting factor in circuit design?
Although primarily operated in reverse breakdown, the 1N4736PE3/TR8 may conduct during transient events or reverse recovery phases in bidirectional protection circuits. A forward drop of 1.2 V means that in such cases, voltage clamping occurs at 6.8 V + 1.2 V = 8.0 V, which may exceed the tolerance of downstream components rated for 7 V maximum. This is particularly critical in ESD protection networks or crowbar circuits where fast, low-impedance paths are needed. If the protected node cannot tolerate 8 V spikes, alternative diodes with lower Vf or faster response (e.g., TVS arrays) should be evaluated instead of relying solely on the 1N4736PE3/TR8.
Why might engineers choose the 1N4736PE3/TR8 over integrated voltage references despite lower precision?
The 1N4736PE3/TR8 offers simplicity, cost-effectiveness, and ruggedness for non-critical voltage regulation tasks. Unlike bandgap references, it lacks temperature compensation and initial accuracy calibration, but it handles surges and transients better due to its discrete nature and higher power rating. In automotive, industrial, or consumer applications where tight tolerances are unnecessary and space allows, the 1N4736PE3/TR8 provides a reliable, off-the-shelf solution with predictable behavior under load changes. Its availability in tape-and-reel and compatibility with existing tooling make it attractive for legacy system upgrades where board real estate and BOM complexity are constrained.
How does the base product number 1N4736 relate to the 1N4736PE3/TR8, and what implications does this have for part lifecycle management?
The 1N4736PE3/TR8 is a specific variant under the broader 1N4736 family, differing mainly in packaging (tape & reel), manufacturer (Microchip Technology), and RoHS compliance level. The original 1N4736 was developed decades ago and remains in production due to its standardization across industries. As a result, the 1N4736PE3/TR8 benefits from mature supply chains and cross-manufacturer interchangeability (e.g., with Vishay or ON Semiconductor equivalents). However, reliance on a single base number increases obsolescence risk; designers should monitor end-of-life notices and maintain substitution plans, such as adopting newer families like the BZT52 or ZMM series for future designs.
What role does the impedance (Zzt = 3.5 Ω) play in determining the load regulation performance of a circuit using the 1N4736PE3/TR8?
Dynamic impedance directly impacts how much the Zener voltage shifts with changes in load current. At 3.5 Ω, a 20 mA increase in load causes approximately 70 mV drop in output voltage, degrading regulation accuracy. This makes the 1N4736PE3/TR8 suitable only for applications where load currents are well-controlled and variation is minimal. For instance, in a simple shunt regulator powering an LED array, stable current draw ensures consistent brightness, but in variable-load systems, the droop may necessitate feedback compensation or use of lower-Zzt devices. Understanding this parameter helps predict real-world behavior beyond datasheet ideal models.
Are there any regulatory or export considerations associated with sourcing the 1N4736PE3/TR8 that could affect global project deployment?
Yes, the 1N4736PE3/TR8 has an ECCN code of EAR99, indicating it is not subject to strict export controls under U.S. regulations unless used in military or high-risk applications. However, importers should verify local compliance with RoHS directives (EU), REACH (chemical substances), and import tariffs based on HTSUS 8541.10.0050. While generally unrestricted, bulk shipments to embargoed regions may trigger scrutiny. Suppliers must provide accurate documentation, and procurement teams should confirm supplier adherence to international trade laws to avoid customs delays or penalties during global rollouts.
How does the operating temperature range of the 1N4736PE3/TR8 compare to modern silicon-based voltage regulators, and what does this imply for outdoor or harsh environment applications?
The 1N4736PE3/TR8 operates from -65°C to 150°C, far exceeding most linear regulators (-40°C to 125°C) and many IC-based references. This broad range makes it ideal for extreme environments such as aerospace, downhole instrumentation, or high-temperature process control. However, unlike integrated regulators, it lacks built-in thermal shutdown or short-circuit protection, so external safeguards are essential. Its robustness allows continued function in desert or arctic conditions where electronics must endure rapid thermal swings, provided power dissipation remains within limits and mechanical stress is minimized.
What testing methodology would you recommend to validate the long-term reliability of the 1N4736PE3/TR8 in field-deployed equipment?
Accelerated life testing should include thermal cycling (-40°C to +125°C, 1000+ cycles), high-temperature storage (150°C, 500 hours), and power endurance tests at 70–80% of rated power (e.g., 0.7 W for 1000 hours). Electrical characterization before and after testing should measure Vz shift, leakage current, and Zzt drift. Additionally, vibration testing per MIL-STD-883 Method 2007 assesses mechanical integrity. Monitoring failure modes—such as open leads, parametric drift, or glass cracking—provides insight into failure mechanisms. Correlation with field return analysis strengthens confidence in the 1N4736PE3/TR8’s suitability for mission-critical deployments.
In a redundant power architecture, could multiple 1N4736PE3/TR8 diodes be paralleled to increase current capacity?
Paralleling 1N4736PE3/TR8 diodes is generally discouraged due to mismatch in Vz and temperature coefficients. Even slight differences in threshold voltage lead to unequal current sharing, causing one diode to overheat while others remain underutilized. Without individual current balancing resistors, derating becomes necessary to ensure safe operation. Instead, designers should use a single higher-power Zener or switch to an integrated reference with internal parallel capability. If paralleling is unavoidable, extensive thermal coupling and current-sharing resistors should be implemented, adding complexity without guaranteed improvement in reliability.

Parts with Similar Specifications

The three parts on the right have similar specifications to Microchip Technology 1N4736PE3/TR8

Product Attribute 1N4736CPE3/TR8 1N4736CPE3/TR12 1N4736PE3/TR12 1N4736P/TR8
Part Number 1N4736CPE3/TR8 1N4736CPE3/TR12 1N4736PE3/TR12 1N4736P/TR8
Manufacturer Microchip Technology Microchip Technology Microchip Technology Microchip Technology
Voltage - Forward (Vf) (Max) @ If - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Current - Reverse Leakage @ Vr - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Power - Max - - - -
Voltage - Zener (Nom) (Vz) - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Impedance (Max) (Zzt) - - - -
Series - - - -
Tolerance - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Mounting Type - Surface Mount Through Hole Surface Mount
Base Product Number - DAC34H84 MAX500 ADS62P42

1N4736PE3/TR8 Datasheet PDF

Download 1N4736PE3/TR8 pdf datasheets and Microchip Technology documentation for 1N4736PE3/TR8 - Microchip Technology.

Datasheets
1N4728AP-1N4764AP,e3.pdf
PCN Assembly/Origin
Manufacturing Change 23/Feb/2021.pdf
Environmental Information
Microchip CA Prop65.pdf Microchip REACH.pdf Microchip RoHS.pdf

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1N4736PE3/TR8 Image

1N4736PE3/TR8

Microchip Technology
98D-1N4736PE3/TR8

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