My Inquiry
My Account
Microchip Technology 1N4743APE3/TR8
- Part No.:
- 1N4743APE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4743APE3/TR8.pdf
- Description:
- DIODE ZENER 13V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:4,967
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N4743APE3/TR8 from Microsemi is a 13 V, 1 W silicon Zener diode in DO-41 plastic package with ±5% voltage tolerance, 10 Ω dynamic impedance at 19 mA test current, and 0.25 A maximum regulator current at 50°C. It provides stable voltage regulation in power supply feedback loops, reference circuits, and overvoltage protection for industrial control modules.
For engineers reviewing the 1N4743APE3/TR8 datasheet, 1N4743APE3/TR8 pinout, 1N4743APE3/TR8 application, or 1N4743APE3/TR8 equivalent, key selection factors include its 13 V nominal Zener voltage, 19 mA test current, 10 Ω ZZT, -65°C to +150°C operating range, and RoHS-compliant matte-tin plating.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain a stable 13 V reference across a wide current range (1–344 mA), with low dynamic impedance ensuring minimal voltage variation under load transients. Its thermal resistance is 45°C/W junction-to-lead (3/8" lead length) and 105°C/W junction-to-ambient on FR4 board.
The device features cathode band polarity marking, UL94V-0 epoxy case, and is moisture-sensitive Level 1 per J-STD-020B-no dry pack required. It supports tape-and-reel packaging (TR8 suffix) and meets MIL-STD-750 ESD robustness requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 13 V ±5% at 19 mA - defines precise regulation point for feedback networks |
| Power Dissipation | 1.0 W at 25°C - sets maximum continuous power handling before thermal derating |
| Dynamic Impedance (ZZT) | 10 Ω at IZT = 19 mA - determines output voltage stability under varying load current |
| Max Regulator Current (IZM) | 344 mA at TL = 50°C - limits safe DC current for sustained regulation |
| Reverse Leakage (IR) | 5 μA max at VR = 9.9 V - ensures low standby power loss in high-impedance bias networks |
| Operating Temperature | -65°C to +150°C - enables use in automotive engine compartments and industrial enclosures |
| Forward Voltage | 1.2 V max at 200 mA - relevant for forward-conduction fault conditions or dual-role designs |
Pinout & Package
DO-41 (DO-204AL) axial-leaded plastic package with cathode indicated by color 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; carries reverse leakage and forward current |
| Cathode | Banded end | Connected to regulated output node; maintains fixed 13 V reference relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with standardized 1N47xxA series mechanical and electrical definitions for interchangeability |
| RoHS-compliant "e3" suffix | Matte-tin terminal plating meets EU Directive 2011/65/EU without lead or hazardous substances |
| Moisture sensitivity Level 1 | No dry-pack or baking required prior to PCB assembly-reduces manufacturing overhead |
| Nonsensitive to ESD | Withstands >4 kV HBM per MIL-STD-750 Method 1020-enables handling without special ESD controls |
| Tape-and-reel packaging (TR8) | Standard EIA-296 compliant reel format for automated SMT placement compatibility |
Applications
| Power Supply Feedback | Voltage Reference |
|---|---|
Use Scenario: Stabilizing output voltage in linear regulators and switching converter feedback paths. IC Role / Device Role / Timing Role: Zener diode serves as precision shunt reference in optocoupler-coupled feedback loop. Use Value: 13 V regulation with 10 Ω ZZT minimizes output drift under line/load transients. | Use Scenario: Providing stable bias voltage for analog comparators and sensor signal conditioning. IC Role / Device Role / Timing Role: Shunt reference source for op-amp input stages requiring low-noise, temperature-stable voltage. Use Value: -65°C to +150°C operation and <±0.05%/°C tempco enable reliable performance across environmental extremes. |
| Overvoltage Clamp | ESD Protection Interface |
Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting voltage to 13 V during surge conditions. Use Value: 344 mA IZM and 0.25 A surge rating allow absorption of short-duration energy spikes without failure. | Use Scenario: Front-end protection for RS-485 transceivers exposed to cable-induced surges. IC Role / Device Role / Timing Role: Primary shunt element in multi-stage TVS network, clamping fast transients before downstream ICs. Use Value: Low 10 Ω ZZT ensures rapid response and tight clamping voltage, reducing stress on protected ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4743A | No "e3" RoHS suffix; Sn/Pb plating; same VZ, ZZT, IZM, package | Not suitable for lead-free assembly; otherwise identical functional behavior | Select when legacy Sn/Pb process compatibility is required and RoHS exemption applies |
| MMBZ5242B | SOT-23 surface-mount package; 12 V nominal VZ; 200 mW power rating; different thermal profile | Used in space-constrained PCBs where axial DO-41 footprint is unacceptable | Choose only if board layout mandates SMT and 12 V (not 13 V) regulation is acceptable |
Compared with 1N4743A and MMBZ5242B, the 1N4743APE3/TR8 offers RoHS compliance, DO-41 mechanical robustness, and exact 13 V regulation-making it optimal for through-hole industrial power supplies where reliability and regulatory compliance are prioritized over miniaturization.
Availability
1N4743APE3/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, analog reference circuits, and overvoltage protection systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 1N4743APE3/TR8 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 engineered for ruggedized voltage regulation in mission-critical power systems-emphasizing thermal stability, moisture resilience, and JEDEC-standard interoperability.
FAQ
What is the Zener voltage tolerance of the 1N4743APE3/TR8?
The 1N4743APE3/TR8 has a nominal Zener voltage of 13 V with a ±5% tolerance, as indicated by the "A" suffix in the part number. This means the actual measured VZ falls between 12.35 V and 13.65 V at 19 mA test current and 25°C lead temperature. The tolerance is guaranteed per JEDEC standard and verified during production testing.
Does the 1N4743APE3/TR8 require dry packing before reflow soldering?
No, the 1N4743APE3/TR8 does not require dry packing. It is rated Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it can be stored indefinitely at ambient conditions without exposure to moisture-related damage during reflow. No baking or humidity-controlled handling is needed prior to assembly.
What is the maximum continuous current the 1N4743APE3/TR8 can regulate at 50°C?
The 1N4743APE3/TR8 supports a maximum regulator current (IZM) of 344 mA at a lead temperature of 50°C. This value is derived from its 1.0 W power rating and thermal derating curve. Operation above this current risks exceeding junction temperature limits and permanent degradation of regulation performance.
How does the "TR8" suffix affect packaging and handling of the 1N4743APE3/TR8?
"TR8" indicates tape-and-reel packaging per EIA-296 standard, with 8 mm carrier tape width and standard orientation for automated pick-and-place equipment. This format enables high-throughput SMT assembly and ensures consistent component feeding, orientation, and static-safe transport-critical for production-line efficiency and repeatability.
Is the 1N4743APE3/TR8 compatible with lead-free reflow profiles?
Yes, the 1N4743APE3/TR8 is fully compatible with lead-free reflow. Its RoHS-compliant "e3" suffix denotes matte-tin terminal plating qualified for peak temperatures up to 260°C for 10 seconds, meeting IPC/JEDEC J-STD-020 requirements. The UL94V-0 epoxy body remains stable under standard Pb-free thermal profiles without cracking or delamination.
1N4743APE3/TR8 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):
- 13 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 9.9 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)
1N4743APE3/TR8 FAQ
1.How can I place an order for 1N4743APE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4743APE3/TR8 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 1N4743APE3/TR8 reliable?
The price and inventory of 1N4743APE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4743APE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4743APE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4743APE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4743APE3/TR8?
1N4743APE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4743APE3/TR8 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 1N4743APE3/TR8?
For technical support, including 1N4743APE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4743APE3/TR8 requirements.
6.How does Aetrix verify that 1N4743APE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4743APE3/TR8 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 1N4743APE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4743APE3/TR8?
All 1N4743APE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4743APE3/TR8, 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 1N4743APE3/TR8 part is unused and in its original packaging.
Return procedure for 1N4743APE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4743APE3/TR8 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…
