My Inquiry
My Account
Microchip Technology 1N4739E3/TR13
- Part No.:
- 1N4739E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4739E3/TR13.pdf
- Description:
- DIODE ZENER 9.1V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:8,396
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N4739E3/TR13 from Microsemi is a 1.0 W, 9.1 V ±5% axial-lead silicon Zener diode in DO-41 (DO-204AL) plastic package, designed for precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation across industrial and embedded systems.
For engineers reviewing the 1N4739E3/TR13 datasheet, 1N4739E3/TR13 pinout, 1N4739E3/TR13 application, or 1N4739E3/TR13 equivalent, key selection criteria include its 9.1 V nominal Zener voltage at 28 mA test current, 5.0 Ω dynamic impedance, 7 μA reverse leakage at 7.2 V, 500 mA maximum Zener current at 50°C, and RoHS-compliant matte-tin plating with tape-and-reel packaging (TR13).
Technical Context
This device operates in reverse-biased breakdown mode to maintain stable output voltage under varying load and line conditions. Its 9.1 V Zener voltage is specified at 28 mA (IZT), with a sharp knee characterized by ZZK = 100 Ω at IZK = 7 mA, ensuring reliable regulation onset.
Thermal performance is defined by 45 °C/W junction-to-lead resistance at 10 mm lead length and 105 °C/W junction-to-ambient on FR4 with 4 mm² copper pads. It supports continuous operation from –65 °C to +150 °C and withstands 260 °C soldering for 10 s.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V ±5% at 28 mA - defines precise regulation point for feedback networks |
| Power Dissipation | 1.0 W at 25°C ambient - sets maximum continuous DC power handling |
| Dynamic Impedance (ZZT) | 5.0 Ω at 28 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | 7 μA max at 7.2 V - guarantees low quiescent current in standby protection circuits |
| Max Regulator Current (IZM) | 500 mA at 50°C - determines peak surge capability before thermal shutdown |
| Knee Impedance (ZZK) | 100 Ω at 7 mA - confirms stable turn-on behavior for low-current references |
| Forward Voltage | 1.2 V max at 200 mA - enables use as clamping diode in bidirectional protection |
Pinout & Package
Package: DO-41 (DO-204AL), axial-lead plastic encapsulated case with cathode band marking; RoHS-compliant matte-tin plating; weight 0.7 g; moisture sensitivity level 1 (no dry pack required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node during regulation |
| Cathode | Zener breakdown terminal / voltage reference output | Banded end; connected to regulated rail or error amplifier input |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxA series | Industry-standard footprint and electrical behavior for drop-in compatibility in legacy designs |
| 5% Zener voltage tolerance (A suffix) | Guarantees regulation accuracy within ±0.455 V of 9.1 V at 25°C |
| RoHS-compliant "e3" suffix | Lead-free matte-tin termination meeting JEDEC J-STD-020B Level 1 moisture requirements |
| Tape-and-reel packaging (TR13) | Standard EIA-296 format enabling automated SMT placement despite axial form factor |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for special handling during board assembly and testing |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing output voltage in isolated flyback or forward converter feedback paths using optocoupler-coupled error amplifiers. IC Role / Device Role / Timing Role: Precision voltage reference providing stable 9.1 V threshold for TL431-type shunt regulators or discrete error comparators. Use Value: Enables ±1% output regulation via tight 9.1 V ±5% tolerance and low 5.0 Ω dynamic impedance under 20–50 mA operating range. | Use Scenario: Protecting microcontroller I/O pins or analog sensor inputs from transient overvoltage events exceeding 9.1 V. IC Role / Device Role / Timing Role: Passive clamping element diverting excess current to ground when input exceeds 9.1 V Zener breakdown threshold. Use Value: Limits voltage excursion to ≤9.1 V + Isurge × ZZT, leveraging 500 mA IZM and 7 μA leakage at 7.2 V for low-power standby integrity. |
| Programmable Voltage Reference | DC-DC Converter Trim Circuit |
Use Scenario: Generating stable bias voltages for op-amp comparators, ADC references, or analog front-end calibration points. IC Role / Device Role / Timing Role: Low-drift, low-noise DC reference source with predictable temperature coefficient near zero crossing (~0 mV/°C at 9.1 V). Use Value: Delivers 9.1 V reference with <100 ppm/°C drift and 100 Ω knee impedance, supporting sub-10 mV accuracy over –40°C to +85°C. | Use Scenario: Fine-tuning output voltage of adjustable DC-DC converters (e.g., LM2596, MP1584) via resistor divider feedback network. IC Role / Device Role / Timing Role: Fixed-voltage node replacing one resistor in feedback divider to set precise output offset. Use Value: Allows trimming resolution down to ±0.1 V using standard 1% resistors, enabled by stable 9.1 V reference and 45 °C/W thermal resistance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4739A | No "e3" RoHS suffix; Sn/Pb termination; same electrical specs and DO-41 package | Not suitable for lead-free manufacturing; requires exemption or alternative process validation | Select only if legacy Pb-based assembly is mandated and RoHS compliance is waived |
| MMBZ5239BS-7-F | SOT-23 surface-mount package; 9.1 V ±5%; 225 mW power rating; 10 Ω ZZT | Limited to low-power signal-level clamping; insufficient for >200 mA regulation loads | Choose for space-constrained PCBs where 1W dissipation is not required |
Compared with 1N4739A and MMBZ5239BS-7-F, the 1N4739E3/TR13 uniquely combines full 1W power handling, RoHS compliance, tape-and-reel automation support, and JEDEC-standard DO-41 mechanical compatibility-making it optimal for high-reliability industrial power supplies requiring long-term component continuity.
Availability
1N4739E3/TR13 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and programmable voltage reference designs requiring stable component supply and long-lifecycle availability.
Supply support for 1N4739E3/TR13 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 1N47xxA series was engineered for robust voltage regulation in harsh-environment power systems, emphasizing thermal stability, ESD immunity, and JEDEC-standard interoperability across decades of design reuse.
FAQ
What is the Zener voltage tolerance of the 1N4739E3/TR13?
The 1N4739E3/TR13 has a nominal Zener voltage of 9.1 V with a ±5% tolerance, as indicated by the "A" suffix in its base part number. This means the actual measured VZ falls between 8.645 V and 9.555 V at 28 mA test current and 25°C lead temperature. The tolerance is guaranteed per JEDEC specification and applies to all units in the production lot.
Does the 1N4739E3/TR13 support automated assembly?
Yes, the 1N4739E3/TR13 is supplied in EIA-296 standard tape-and-reel packaging (denoted by "TR13"), enabling compatibility with pick-and-place equipment for axial-lead insertion. Its RoHS-compliant matte-tin plating ensures reliable solder wetting during reflow or wave soldering without requiring special flux or preheat profiles.
What is the maximum steady-state power dissipation for the 1N4739E3/TR13?
The 1N4739E3/TR13 is rated for 1.0 W steady-state power dissipation at 25°C ambient or at lead temperature (TL) < 105°C with 10 mm lead length from the body. Derating is required above 25°C ambient per Figure 1 in the datasheet, reaching zero power at 150°C ambient due to its 105°C/W junction-to-ambient thermal resistance on FR4.
How does the 1N4739E3/TR13 perform under surge conditions?
The 1N4739E3/TR13 supports a maximum non-repetitive reverse surge current (ISM) of 500 mA, measured using a ½ sine-wave pulse of 1/120 second duration at 25°C. This capability allows it to absorb transient overvoltage events in protection circuits without degradation, provided average power remains within 1.0 W limits and thermal design accommodates pulse energy.
Is the 1N4739E3/TR13 suitable for use as a voltage reference in precision analog circuits?
Yes, the 1N4739E3/TR13 delivers stable 9.1 V regulation with 5.0 Ω dynamic impedance at 28 mA and 100 Ω knee impedance at 7 mA, supporting precision applications such as op-amp biasing and ADC references. Its temperature coefficient near zero mV/°C at 9.1 V and low 7 μA leakage at 7.2 V further enhance accuracy in analog signal chains.
1N4739E3/TR13 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):
- 9.1 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 5 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 7 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)
1N4739E3/TR13 FAQ
1.How can I place an order for 1N4739E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4739E3/TR13 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 1N4739E3/TR13 reliable?
The price and inventory of 1N4739E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4739E3/TR13 is usually 5 days.
3.What payment methods are accepted for 1N4739E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4739E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4739E3/TR13?
1N4739E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4739E3/TR13 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 1N4739E3/TR13?
For technical support, including 1N4739E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4739E3/TR13 requirements.
6.How does Aetrix verify that 1N4739E3/TR13 is sourced from the original manufacturer or authorized distributors?
All 1N4739E3/TR13 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 1N4739E3/TR13 meets industry standards.
7.What is the process for return or replacement of 1N4739E3/TR13?
All 1N4739E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4739E3/TR13, 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 1N4739E3/TR13 part is unused and in its original packaging.
Return procedure for 1N4739E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4739E3/TR13 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
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…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
