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Microchip Technology 1N4743CPE3/TR8
- Part No.:
- 1N4743CPE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4743CPE3/TR8.pdf
- Description:
- DIODE ZENER 13V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:3,179
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Product details
Overview
1N4743CPE3/TR8 from Microsemi is a 13 V, 2% tolerance, 1 W silicon Zener diode in DO-41 plastic package, rated for 19 mA test current, 10 Ω dynamic impedance at IZT, and 344 mA maximum regulator current at 50°C. It provides precision voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4743CPE3/TR8 datasheet, 1N4743CPE3/TR8 pinout, 1N4743CPE3/TR8 application, or 1N4743CPE3/TR8 equivalent, key selection factors include its ±2% Zener voltage tolerance, low 10 Ω ZZT, 13 V nominal breakdown, DO-41 axial-leaded mechanical form, and RoHS-compliant matte-tin plating with tape-and-reel packaging (TR8).
Technical Context
This Zener operates in reverse-biased breakdown mode to maintain stable 13 V regulation across 19 mA test current and up to 344 mA maximum DC current at 50°C ambient. Its 10 Ω dynamic impedance ensures minimal output voltage variation under load changes.
Designed for operation between –65°C and +150°C, it features 45°C/W junction-to-lead thermal resistance at 10 mm lead length and meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity-no dry pack required. Polarity is marked by cathode band; regulation requires banded end positive relative to anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 13 V ±2% at 19 mA - precise reference for feedback loops and clamp thresholds |
| Power Dissipation | 1.0 W at 25°C - supports compact linear regulator designs without forced cooling |
| Dynamic Impedance (ZZT) | 10 Ω at IZT = 19 mA - low AC impedance improves regulation stability under varying load |
| Max Regulator Current (IZM) | 344 mA at TL = 50°C - defines safe continuous DC current limit for sustained clamping |
| Reverse Leakage (IR) | 5 μA max at VR = 9.9 V - ensures minimal quiescent current in standby protection circuits |
| Thermal Resistance | 45°C/W junction-to-lead - enables accurate thermal design when leads serve as heat path |
| Forward Voltage | 1.2 V max at 200 mA - relevant for forward-conduction fault detection or dual-mode use |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by colored band; body diameter 2.0–2.7 mm, overall length 4.5–5.5 mm, lead diameter 0.4–0.6 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference/ground node in Zener configuration | Connected to lower-potential side; forms regulated output node when cathode is biased higher |
| Cathode | Regulated output node | Banded end; must be held at higher potential than anode to enter breakdown and regulate at 13 V |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables tighter feedback loop accuracy vs. standard ±5% (A) or ±10% (no suffix) parts |
| RoHS-compliant matte-tin plating (e3 suffix) | Meets lead-free assembly requirements without compromising solderability per MIL-STD-750 Method 2026 |
| Tape-and-reel packaging (TR8 suffix) | Supports automated SMT placement despite axial-leaded form-compatible with standard TR feeders |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement and floor-life constraints-ready for immediate reflow |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions during board assembly and testing |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulators or switching converter error amplifiers. IC Role / Device Role / Timing Role: Precision shunt reference providing 13 V setpoint for control loop comparison. Use Value: ±2% tolerance ensures output voltage accuracy within ±0.26 V, critical for compliance with tight output spec limits. | Use Scenario: Protecting downstream ICs from transient voltage spikes on 12 V rail. IC Role / Device Role / Timing Role: Shunt clamp activated above 13 V to divert surge current away from sensitive loads. Use Value: 344 mA IZM rating allows absorption of moderate-energy transients without thermal runaway. |
| Signal Level Translation | Current Source Biasing |
Use Scenario: Generating fixed bias voltage for op-amp input stages in sensor signal conditioning. IC Role / Device Role / Timing Role: Stable DC reference node establishing common-mode voltage for differential inputs. Use Value: 10 Ω ZZT minimizes noise coupling and maintains reference integrity under varying source impedance. | Use Scenario: Setting gate voltage for constant-current LED driver MOSFETs. IC Role / Device Role / Timing Role: Zener-based current mirror reference defining base current for bipolar or gate voltage for FET. Use Value: Low 1.2 V forward drop enables bidirectional use-forward conduction aids startup sequencing or fault indication. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4743A | Same 13 V nominal, but ±5% tolerance (A suffix) instead of ±2% | Acceptable where 0.65 V wider regulation band is permissible | Select when cost sensitivity outweighs need for tight reference accuracy |
| BZX84-C13 | SOT-23 surface-mount package; same 13 V ±5%, 300 mW rating | Not suitable for 1 W dissipation; limited to low-power biasing | Choose only for space-constrained PCBs where power demand ≤300 mW |
Compared with 1N4743A and BZX84-C13, the 1N4743CPE3/TR8 delivers superior voltage precision and higher power handling in an axial-leaded, tape-and-reel format-ideal for through-hole production and high-stability analog references.
Availability
1N4743CPE3/TR8 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, signal level translation, and current source biasing requiring stable component supply across industrial, automotive, and embedded design cycles.
Supply support for 1N4743CPE3/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, RF, and discrete components for aerospace, defense, and industrial markets.
The 1N47xx series was engineered for robust, low-cost voltage regulation in harsh-environment power systems-emphasizing thermal stability, ESD resilience, and long-term parametric consistency.
FAQ
What is the Zener voltage tolerance of the 1N4743CPE3/TR8?
The 1N4743CPE3/TR8 has a ±2% Zener voltage tolerance, confirmed by the "C" suffix in its part number per Microsemi's documentation. This means its nominal 13 V breakdown voltage falls within 12.74 V to 13.26 V at 19 mA test current and 25°C lead temperature. This tighter tolerance supports higher-accuracy regulation than standard ±5% (A-suffix) variants like the 1N4743A.
Is the 1N4743CPE3/TR8 RoHS compliant?
Yes, the 1N4743CPE3/TR8 is RoHS compliant, as indicated by the "e3" suffix in its full part number. Microsemi specifies this denotes annealed matte-tin plating meeting RoHS requirements and solderable per MIL-STD-750 Method 2026. The device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits.
What does the "TR8" suffix indicate in 1N4743CPE3/TR8?
The "TR8" suffix indicates tape-and-reel packaging per EIA-296 standard, with 8 mm carrier tape width. This format enables automated pick-and-place insertion for through-hole assembly lines. Unlike bulk or ammo-pack options, TR8 supports consistent feeding and reduces manual handling-critical for high-volume manufacturing of power supplies and industrial controls using the 1N4743CPE3/TR8.
What is the maximum continuous Zener current for the 1N4743CPE3/TR8?
The maximum continuous Zener current (IZM) for the 1N4743CPE3/TR8 is 344 mA at a lead temperature (TL) of 50°C, per Microsemi's datasheet. This value decreases with rising temperature due to 1 W power derating; at 25°C, the absolute maximum is governed by PD = 1 W, yielding ~76.9 mA at 13 V. Designers must apply thermal derating curves to ensure safe operation under actual board conditions.
How is polarity marked on the 1N4743CPE3/TR8?
Polarity on the 1N4743CPE3/TR8 is marked by a visible cathode band near one lead end. For proper Zener regulation, the banded (cathode) end must be held at a higher potential than the unbanded (anode) end. Reverse connection will result in forward conduction (~1.2 V drop at 200 mA), not regulation. This marking aligns with JEDEC DO-41 standards and is laser-etched or molded into the plastic body.
1N4743CPE3/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:
- ±2%
- 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)
1N4743CPE3/TR8 FAQ
1.How can I place an order for 1N4743CPE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4743CPE3/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 1N4743CPE3/TR8 reliable?
The price and inventory of 1N4743CPE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4743CPE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4743CPE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4743CPE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4743CPE3/TR8?
1N4743CPE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4743CPE3/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 1N4743CPE3/TR8?
For technical support, including 1N4743CPE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4743CPE3/TR8 requirements.
6.How does Aetrix verify that 1N4743CPE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4743CPE3/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 1N4743CPE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4743CPE3/TR8?
All 1N4743CPE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4743CPE3/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 1N4743CPE3/TR8 part is unused and in its original packaging.
Return procedure for 1N4743CPE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4743CPE3/TR8 Tags
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MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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