My Inquiry
My Account
Microchip Technology 1N4743PE3/TR12
- Part No.:
- 1N4743PE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4743PE3/TR12.pdf
- Description:
- DIODE ZENER 13V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:8,142
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N4743PE3/TR12 from Microsemi is a 13 V, 1 W silicon Zener diode in DO-41 plastic package with ±5% voltage tolerance, 19 mA test current (IZT), and 10 Ω dynamic impedance (ZZT) at IZT-designed for precision voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4743PE3/TR12 datasheet, 1N4743PE3/TR12 pinout, 1N4743PE3/TR12 application, or 1N4743PE3/TR12 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (45 °C/W junction-to-lead), surge current rating (344 mA), reverse leakage (5 µA at 9.9 V), and RoHS-compliant matte-tin plating.
Technical Context
This axial-lead Zener operates in reverse breakdown to maintain stable output voltage across wide current (1–344 mA) and temperature (–65 °C to +150 °C) ranges. Its 13 V nominal Zener voltage exhibits a positive temperature coefficient above ~5 V, with typical TC of +8.5 mV/°C per Figure 3.
The device uses void-free thermosetting epoxy encapsulation (UL94V-0), features cathode band polarity marking, and delivers regulated voltage with low knee impedance (0.25 Ω at IZK = 1.5 mA), enabling reliable clamping in transient suppression and feedback loop applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 13 V ±5% at 19 mA - sets precise reference level for feedback networks and clamp thresholds |
| Power Dissipation | 1.0 W at TL < 105 °C - supports continuous regulation without forced cooling in compact layouts |
| Dynamic Impedance (ZZT) | 10 Ω at IZT = 19 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | 5 µA max at VR = 9.9 V - guarantees low standby power loss in high-impedance bias networks |
| Surge Current (ISM) | 344 mA peak (½-sine, 1/120 s) - withstands short-duration overvoltage events without degradation |
| Thermal Resistance | 45 °C/W junction-to-lead (3/8″ lead length) - enables accurate thermal design for PCB trace heatsinking |
| Operating Temp | –65 °C to +150 °C - suitable for industrial and automotive under-hood environments |
Pinout & Package
DO-41 (JEDEC 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 | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node when used in reverse-biased regulation |
| Cathode | Zener breakdown terminal / voltage reference output | Banded end; connected to regulated voltage node-must be held positive relative to anode for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| RoHS-compliant "e3" suffix | Matte-tin termination meets EU Directive 2011/65/EU and J-STD-609A Class 1 |
| Moisture Sensitivity Level 1 | No dry pack required per IPC/JEDEC J-STD-020B-enables direct SMT-compatible handling |
| Low thermal resistance | 45 °C/W junction-to-lead improves power derating margin vs. glass-body variants |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020-reduces handling risk in assembly lines |
| Tape-and-reel packaging | "TR12" suffix denotes EIA-296 standard 12 mm tape-supports automated pick-and-place |
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: Zener reference element providing fixed 13 V threshold to error amplifier input. Use Value: Maintains ±5% output regulation across line/load variations and 50 °C ambient temperature swings. | Use Scenario: Clamping transient spikes on 12 V automotive or industrial control bus lines. IC Role / Device Role / Timing Role: Shunt protection device diverting surge current above 13 V to ground. Use Value: Limits voltage excursions to ≤13.7 V (VZ + ΔVZ) during 344 mA surges, preventing downstream IC damage. |
| Voltage Monitor Circuit | Signal Level Translation |
Use Scenario: Detecting undervoltage or overvoltage conditions in battery-powered instrumentation. IC Role / Device Role / Timing Role: Threshold detector comparing sensed voltage against 13 V Zener reference. Use Value: Enables clean logic-level flag generation with <5 µA leakage ensuring minimal battery drain. | Use Scenario: Biasing gate drive circuits requiring stable 13 V rail from higher-voltage supplies. IC Role / Device Role / Timing Role: Passive voltage translator establishing regulated auxiliary supply for MOSFET drivers. Use Value: Delivers low-noise 13 V with 10 Ω dynamic impedance-critical for minimizing driver timing jitter. |
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 termination; same VZ, IZT, ZZT, and package | Not compliant with EU RoHS or J-STD-609A; requires Pb-containing solder process | Select only if legacy Pb-based assembly is mandated and environmental compliance is not required |
| MMBZ5243BS-7-F | SOT-23 surface-mount package; 13 V ±5%; 225 mW Pd; 100 mA IZM; 15 Ω ZZT | Lower power rating and different thermal profile-requires layout redesign and derating for 1 W operation | Choose for space-constrained PCBs where board area savings outweigh power and thermal trade-offs |
Compared with 1N4743A and MMBZ5243BS-7-F, the 1N4743PE3/TR12 offers full 1 W dissipation in RoHS-compliant axial form with proven thermal performance on FR4, making it optimal for through-hole power reference and protection where reliability and regulatory compliance are mandatory.
Availability
1N4743PE3/TR12 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and voltage monitor circuits requiring stable component supply across industrial, automotive, and instrumentation programs.
Supply support for 1N4743PE3/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 engineered for robust, cost-effective voltage regulation in harsh-environment power systems-emphasizing tight tolerances, MIL-grade screening options, and moisture-insensitive packaging.
FAQ
What is the Zener voltage tolerance of the 1N4743PE3/TR12?
The 1N4743PE3/TR12 has a nominal Zener voltage of 13 V with a tolerance of ±5%, as indicated by the "A" suffix in its base part number (1N4743A). This tolerance is verified at 19 mA test current and 25 °C lead temperature, and applies across the full operating temperature range of –65 °C to +150 °C per Microsemi's published electrical characteristics table.
Does the 1N4743PE3/TR12 require dry packing before reflow?
No, the 1N4743PE3/TR12 does not require dry packing. It is rated Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it may be stored indefinitely at ambient conditions and placed directly into reflow or wave solder processes without preconditioning or baking.
What is the maximum surge current rating for the 1N4743PE3/TR12?
The 1N4743PE3/TR12 has a maximum non-repetitive surge current (ISM) of 344 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating enables reliable transient clamping in power rail protection applications without permanent parameter shift.
How is polarity marked on the 1N4743PE3/TR12?
The 1N4743PE3/TR12 uses a single cathode band painted on the body near one lead end. The banded end is the cathode and must be held at a higher potential than the unmarked (anode) end for proper Zener regulation. This marking complies with JEDEC DO-41 mechanical standards and is visible after board mounting.
What does the "TR12" suffix indicate in 1N4743PE3/TR12?
"TR12" indicates tape-and-reel packaging per EIA-296 standard, using 12 mm carrier tape. This format supports automated surface-mount assembly equipment and ensures consistent orientation and spacing (typically 4 mm pitch) for high-yield pick-and-place operations-distinct from bulk or ammo-pack options.
1N4743PE3/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):
- 13 V
- Tolerance:
- ±10%
- 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)
1N4743PE3/TR12 FAQ
1.How can I place an order for 1N4743PE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4743PE3/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 1N4743PE3/TR12 reliable?
The price and inventory of 1N4743PE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4743PE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4743PE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4743PE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4743PE3/TR12?
1N4743PE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4743PE3/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 1N4743PE3/TR12?
For technical support, including 1N4743PE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4743PE3/TR12 requirements.
6.How does Aetrix verify that 1N4743PE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4743PE3/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 1N4743PE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4743PE3/TR12?
All 1N4743PE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4743PE3/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 1N4743PE3/TR12 part is unused and in its original packaging.
Return procedure for 1N4743PE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4743PE3/TR12 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…
