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Microchip Technology 1N4744CP/TR12
- Part No.:
- 1N4744CP/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4744CP/TR12.pdf
- Description:
- DIODE ZENER 15V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:4,009
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Product details
Overview
1N4744CP/TR12 from Microsemi is a 15 V, 1 W silicon Zener diode in DO-41 plastic package with ±5% voltage tolerance, 14 Ω dynamic impedance at 17 mA test current, and 0.25 A maximum regulator current at 50°C. It provides stable voltage regulation in power supply reference and overvoltage protection circuits across industrial temperature range.
For engineers reviewing the 1N4744CP/TR12 datasheet, 1N4744CP/TR12 pinout, 1N4744CP/TR12 application, or 1N4744CP/TR12 equivalent, key selection factors include Zener voltage accuracy, thermal resistance (45°C/W junction-to-lead), surge current rating (304 mA), reverse leakage (<5 µA at 11.4 V), and RoHS-compliant matte-tin plating.
Technical Context
This axial-lead Zener operates in reverse breakdown to maintain a stable 15 V reference across 17 mA test current and up to 0.25 A DC regulation current. Its 14 Ω dynamic impedance ensures low output variation under load changes, while the 45°C/W junction-to-lead thermal resistance supports reliable operation at TL ≤ 105°C with 3/8" lead length.
The device features a sharp knee in the breakdown curve verified by dual-point Zener impedance measurement per MicroNote 202, and meets MIL-STD-750 Method 1020 for ESD insensitivity. Polarity is marked by cathode band; regulation requires cathode positive relative to anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 15 V ±5% at 17 mA - defines nominal regulation point with tight production control |
| Power Dissipation | 1.0 W at 25°C ambient - sets maximum continuous DC power handling before derating |
| Dynamic Impedance (ZZT) | 14 Ω at IZT = 17 mA - determines output voltage stability under varying load current |
| Max Regulator Current (IZM) | 0.25 A at TL = 50°C - limits safe DC current for sustained regulation without thermal runaway |
| Reverse Leakage (IR) | <5 µA at VR = 11.4 V - ensures minimal quiescent current in standby or sensing applications |
| Surge Current (ISM) | 304 mA (½-sine, 1/120 s) - defines transient overvoltage clamping capability |
| Thermal Resistance | 45°C/W junction-to-lead (3/8" lead length) - enables thermal design with known junction temperature rise |
Pinout & Package
DO-41 (DO-204AL) plastic molded package with axial leads; void-free UL94V-0 epoxy body; cathode indicated by colored band; tin-lead or RoHS-compliant matte-tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common; reverse-biased operation requires this terminal negative relative to cathode |
| Cathode | Regulated output node | Banded end; held at stable 15 V above anode during breakdown; carries full regulation current |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Fully compliant with JEDEC 1N4744A standard - ensures interchangeability and qualification consistency |
| Moisture Sensitivity Level 1 | No dry pack required per IPC/JEDEC J-STD-020B - simplifies SMT handling and storage logistics |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for special ESD handling in assembly |
| RoHS-compliant option | e3 suffix indicates annealed matte-tin plating - meets environmental compliance without performance trade-off |
| Tape-and-reel packaging | TR12 suffix denotes EIA-296 standard reel - enables automated pick-and-place assembly |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stable 15 V reference for linear regulator feedback or ADC reference in industrial power modules. IC Role / Device Role / Timing Role: Voltage reference element providing precise DC bias point independent of input ripple. Use Value: 14 Ω dynamic impedance minimizes output deviation under 10–100 mA load variations, ensuring <±0.15 V regulation error. | Use Scenario: Protection circuit limiting voltage spikes on 12 V automotive sensor lines during load dump events. IC Role / Device Role / Timing Role: Shunt clamp absorbing transient energy above 15 V threshold to safeguard downstream ICs. Use Value: 304 mA surge current rating handles 100 ms transients per ISO 7637-2 Pulse 5a without degradation. |
| Voltage Monitor Threshold | Current Source Bias |
Use Scenario: Undervoltage lockout (UVLO) detection in battery-powered medical devices operating from Li-ion cells. IC Role / Device Role / Timing Role: Precision threshold detector comparing system voltage against 15 V reference via comparator input. Use Value: ±5% VZ tolerance ensures consistent trip point across temperature (-65°C to +150°C). | Use Scenario: Constant-current bias for LED driver transistor in emergency lighting control circuits. IC Role / Device Role / Timing Role: Two-terminal current source formed with series resistor, delivering stable base drive current. Use Value: Low 14 Ω ZZT maintains current stability within ±2% over 15–25 mA operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A | No TR tape-and-reel packaging; same electrical specs and DO-41 package | Requires manual or bulk loading; unsuitable for high-volume automated assembly | Select 1N4744CP/TR12 when reel-fed placement is required; choose 1N4744A for prototyping or low-volume hand-soldering |
| MMBZ5245BS | SOT-23 surface-mount package; 15 V ±5%, 225 mW power rating; 17 Ω ZZT | Lower power handling and different thermal profile; not interchangeable without PCB redesign | Choose MMBZ5245BS only for space-constrained PCBs where 1 W dissipation is unnecessary and reflow compatibility is critical |
Compared with 1N4744A and MMBZ5245BS, the 1N4744CP/TR12 delivers full 1 W regulation capability in tape-and-reel format, enabling automated manufacturing of robust power references where thermal margin and assembly efficiency are prioritized over footprint size.
Availability
1N4744CP/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor protection circuits, and medical device voltage monitoring requiring stable component supply with traceable RoHS-compliant sourcing.
Supply support for 1N4744CP/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N47xxAP Zener series was designed for general-purpose voltage regulation in harsh-environment applications where long-term stability, wide temperature operation, and JEDEC-standard interchangeability are essential.
FAQ
What is the Zener voltage tolerance of the 1N4744CP/TR12?
The 1N4744CP/TR12 has a nominal Zener voltage of 15 V with a tolerance of ±5%, as indicated by the "A" suffix in the JEDEC designation. This tolerance is specified at 25°C lead temperature with 17 mA test current and applies across the full operating temperature range of –65°C to +150°C.
Does the 1N4744CP/TR12 require dry packing before PCB assembly?
No, the 1N4744CP/TR12 is moisture sensitivity level (MSL) 1 per IPC/JEDEC J-STD-020B, meaning it does not require dry packing or baking prior to reflow soldering. Its plastic DO-41 package is inherently resistant to moisture absorption, simplifying handling and storage logistics.
What is the maximum steady-state current the 1N4744CP/TR12 can regulate continuously?
The 1N4744CP/TR12 supports a maximum regulator current (IZM) of 0.25 A at 50°C lead temperature. At higher temperatures, current must be derated per the power derating curve in the datasheet; at 105°C lead temperature, the safe continuous current drops to approximately 0.125 A to maintain 1 W power limit.
Is the 1N4744CP/TR12 RoHS compliant?
Yes, the "e3" suffix in 1N4744CP/TR12 confirms RoHS compliance with annealed matte-tin plating. The device meets EU Directive 2011/65/EU requirements and is compatible with lead-free reflow profiles up to 260°C for 10 seconds.
How is polarity marked on the 1N4744CP/TR12?
The 1N4744CP/TR12 uses a cathode band - a single colored ring near one end of the DO-41 body - to indicate the cathode terminal. For proper Zener regulation, the banded (cathode) end must be held positive relative to the anode end; forward conduction occurs at ~1.2 V typical.
1N4744CP/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):
- 15 V
- Tolerance:
- ±2%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 14 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 11.4 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)
1N4744CP/TR12 FAQ
1.How can I place an order for 1N4744CP/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4744CP/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 1N4744CP/TR12 reliable?
The price and inventory of 1N4744CP/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4744CP/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4744CP/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4744CP/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4744CP/TR12?
1N4744CP/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4744CP/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 1N4744CP/TR12?
For technical support, including 1N4744CP/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4744CP/TR12 requirements.
6.How does Aetrix verify that 1N4744CP/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4744CP/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 1N4744CP/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4744CP/TR12?
All 1N4744CP/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4744CP/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 1N4744CP/TR12 part is unused and in its original packaging.
Return procedure for 1N4744CP/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4744CP/TR12 Tags
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MM5Z5V1ST1G
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