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Microchip Technology 1N4742CP/TR12
- Part No.:
- 1N4742CP/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4742CP/TR12.pdf
- Description:
- DIODE ZENER 12V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:7,755
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Product details
Overview
1N4742CP/TR12 from Microsemi is a 12 V, 5% tolerance, 1 W axial-lead silicon Zener diode in DO-41 plastic package, rated for 21 mA test current (IZT), 76 Ω dynamic impedance (ZZT), and 9.1 V reverse test voltage (VR), used for precision voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4742CP/TR12 datasheet, 1N4742CP/TR12 pinout, 1N4742CP/TR12 application, or 1N4742CP/TR12 equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (45 °C/W junction-to-lead), surge current rating (380 mA), RoHS-compliant "e3" plating, and tape-and-reel packaging (TR12).
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable DC voltage across its terminals under varying load and line conditions. It delivers regulated output at 12 V with ±5% tolerance when biased at 21 mA, exhibiting 76 Ω dynamic impedance at that point and 0.25 A maximum regulator current at 50 °C ambient.
Its DO-41 plastic package provides Level 1 moisture sensitivity (no dry pack required), 0.7 g mass, UL94V-0 epoxy body, and tin-lead or RoHS-compliant matte-tin plating. Polarity is marked by cathode band; regulation requires cathode-positive biasing relative to anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V ±5% at 21 mA - defines nominal regulation setpoint with tight production consistency |
| Power Dissipation | 1.0 W at 25 °C lead temperature - sets maximum continuous steady-state power handling |
| Dynamic Impedance (ZZT) | 76 Ω at IZT = 21 mA - determines small-signal AC voltage variation under load transients |
| Max Regulator Current (IZM) | 380 mA at TA = 50 °C - limits peak DC current before thermal runaway at elevated ambient |
| Reverse Test Voltage (VR) | 9.1 V @ IR ≤ 5 μA - confirms low leakage prior to breakdown onset |
| Thermal Resistance | 45 °C/W junction-to-lead (3/8″ lead length) - enables thermal design of heatsinking and PCB trace layout |
| Surge Current (ISM) | 380 mA (½-sine, 1/120 s) - supports transient overvoltage clamping without failure |
Pinout & Package
DO-41 (DO-204AL) plastic axial-lead package with cathode indicated by colored 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 | Reference ground node | Connected to circuit common; reverse-biased operation requires this terminal to be at lower potential than cathode |
| Cathode | Regulated output node | Banded end; held at stable 12 V above anode when reverse current ≥21 mA; must be connected to supply rail or error amplifier input |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxA series | Industry-standard footprint and electrical behavior enabling direct replacement in legacy designs |
| Plastic P-suffix construction | Lower thermal resistance vs. glass-body (G-suffix) variants - improves power derating margin in compact layouts |
| RoHS-compliant "e3" suffix | Meets EU Directive 2011/65/EU with annealed matte-tin plating - eliminates lead while maintaining solderability |
| Tape-and-reel TR12 packaging | Standard EIA-296 format - supports automated SMT placement despite axial-lead form factor via carrier tape feed |
| Level 1 moisture sensitivity | No dry pack or baking required before assembly - reduces manufacturing overhead and avoids moisture-induced popcorning |
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 12 V reference to error amplifier input. Use Value: Maintains ±5% output accuracy over -65 °C to +150 °C and 21–380 mA operating range. | Use Scenario: Clamping transient surges on 12 V automotive or industrial control bus lines. IC Role / Device Role / Timing Role: Shunt protection device diverting excess energy to ground during voltage spikes. Use Value: Withstands 380 mA surge (½-sine, 1/120 s) without degradation, ensuring system-level ESD robustness. |
| Signal Level Translation | Current Source Biasing |
Use Scenario: Generating precise 12 V logic threshold for comparator inputs in analog-digital interface circuits. IC Role / Device Role / Timing Role: Voltage reference defining switching point for hysteresis or window detection. Use Value: Low 76 Ω dynamic impedance minimizes threshold shift under varying source impedance loads. | Use Scenario: Setting bias current for LED drivers or op-amp input stages requiring stable 12 V headroom. IC Role / Device Role / Timing Role: Constant-voltage node establishing predictable current through series resistor. Use Value: 1 W power rating supports >100 mA bias currents with adequate thermal margin on FR4 PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A | No "P" suffix → glass-body DO-35 package; higher thermal resistance (65 °C/W vs. 45 °C/W) | Less suitable for high-power-density layouts; requires longer leads or larger copper area for same thermal performance | Select 1N4742CP/TR12 when board space or thermal management is constrained |
| MMSZ4702T1G | Surface-mount SOD-123 package; 12 V ±5%, 500 mW rating; 30 Ω ZZT @ 25 mA | Not pin-compatible; requires PCB redesign; lower power dissipation limits continuous current | Choose MMSZ4702T1G only for space-constrained SMT-only designs accepting reduced power margin |
Compared with 1N4742A and MMSZ4702T1G, the 1N4742CP/TR12 offers superior thermal performance in axial-lead form, RoHS compliance, and tape-and-reel readiness - making it optimal for high-reliability through-hole production where thermal stability and supply chain continuity matter.
Availability
1N4742CP/TR12 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and signal level translation applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 1N4742CP/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, RF, and discrete components for aerospace, defense, and industrial markets.
The 1N47xxAP series was engineered for ruggedized voltage regulation in mission-critical systems, emphasizing thermal robustness, moisture resilience, and military-grade screening compatibility.
FAQ
What is the Zener voltage tolerance of the 1N4742CP/TR12?
The 1N4742CP/TR12 has a nominal Zener voltage of 12 V with a tolerance of ±5%, as indicated by the "A" suffix in its JEDEC designation. This tolerance is verified at 21 mA test current and 25 °C lead temperature. The 1N4742CP/TR12 maintains this specification across its full operating temperature range of –65 °C to +150 °C, supporting stable regulation in harsh environments.
Does the 1N4742CP/TR12 require dry packing before reflow soldering?
No, the 1N4742CP/TR12 does not require dry packing. Its DO-41 plastic package is rated IPC/JEDEC J-STD-020B Level 1 for moisture sensitivity, meaning it can be stored and processed without baking or humidity-controlled handling. This simplifies manufacturing logistics and eliminates risk of popcorning during soldering - a key advantage confirmed in Microsemi's official documentation for the 1N4728AP–1N4764AP series.
What is the maximum surge current rating for the 1N4742CP/TR12?
The 1N4742CP/TR12 is rated for a maximum surge current (ISM) of 380 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating applies specifically to the 1N4742CP/TR12 variant and enables reliable transient clamping in automotive and industrial power rails without permanent degradation.
Is the 1N4742CP/TR12 RoHS compliant?
Yes, the 1N4742CP/TR12 is RoHS compliant, as confirmed by the "e3" suffix in its full part number. This indicates annealed matte-tin plating per EU Directive 2011/65/EU, with no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE. The 1N4742CP/TR12 meets all substance restrictions and is certified for use in environmentally regulated markets.
What does the "TR12" suffix indicate in 1N4742CP/TR12?
"TR12" denotes EIA-296 standard tape-and-reel packaging with 12 mm tape width, enabling automated pick-and-place assembly. This format is specified in Microsemi's documentation for the 1N4728AP–1N4764AP series and ensures consistent feeding, orientation, and static-safe handling. The 1N4742CP/TR12 is supplied in reels containing 10,000 units, supporting high-volume production runs without manual handling.
1N4742CP/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):
- 12 V
- Tolerance:
- ±2%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 9 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 9.1 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)
1N4742CP/TR12 FAQ
1.How can I place an order for 1N4742CP/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4742CP/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 1N4742CP/TR12 reliable?
The price and inventory of 1N4742CP/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4742CP/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4742CP/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4742CP/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4742CP/TR12?
1N4742CP/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4742CP/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 1N4742CP/TR12?
For technical support, including 1N4742CP/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4742CP/TR12 requirements.
6.How does Aetrix verify that 1N4742CP/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4742CP/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 1N4742CP/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4742CP/TR12?
All 1N4742CP/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4742CP/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 1N4742CP/TR12 part is unused and in its original packaging.
Return procedure for 1N4742CP/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4742CP/TR12 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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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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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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Diodes Incorporated
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