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Microchip Technology 1N4758AP/TR12
- Part No.:
- 1N4758AP/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4758AP/TR12.pdf
- Description:
- DIODE ZENER 56V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:9,442
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Product details
Overview
1N4758AP/TR12 from Microsemi is a 1.0 W, 56 V ±5% Zener diode in DO-41 plastic package, rated for 4.5 mA test current (IZT), 110 Ω dynamic impedance (ZZT), and 2000 mA maximum regulator current (IZM) at TA = 50°C. It provides stable voltage regulation in power supply reference, overvoltage protection, and biasing circuits across industrial temperature range.
For engineers reviewing the 1N4758AP/TR12 datasheet, 1N4758AP/TR12 pinout, 1N4758AP/TR12 application, or 1N4758AP/TR12 equivalent, key selection factors include its 56 V nominal Zener voltage, 1.0 W power dissipation at TL < 105°C, 45 °C/W junction-to-lead thermal resistance, RoHS-compliant "e3" plating option, and tape-and-reel packaging (TR12).
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain a stable 56 V reference across a wide current range (0.25–2000 mA). Its 110 Ω dynamic impedance at 4.5 mA ensures low voltage variation under load changes, while the DO-41 axial-leaded package supports through-hole mounting with 0.7 g mass and UL94V-0 epoxy body.
Designed for operation from –65°C to +150°C, it exhibits a positive temperature coefficient above ~5 V, with typical TC near +3.5 mV/°C at 56 V. It meets MIL-STD-750 Method 1020 for ESD insensitivity and IPC/JEDEC J-STD-020B Level 1 moisture sensitivity-no dry pack required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 56 V ±5% at IZT = 4.5 mA - defines precise regulation point for reference and clamp applications |
| Power Dissipation | 1.0 W at TL < 105°C (3/8″ lead length) - sets maximum continuous thermal load without derating |
| Dynamic Impedance (ZZT) | 110 Ω at IZT = 4.5 mA - determines output voltage stability under varying load current |
| Max Regulator Current (IZM) | 2000 mA at TA = 50°C - establishes peak steady-state current capability before thermal runaway |
| Thermal Resistance | 45 °C/W junction-to-lead - enables accurate thermal design when leads act as heatsinks |
| Reverse Leakage (IR) | 5 μA max at VR = 42.6 V - ensures minimal quiescent current in high-impedance bias networks |
| Forward Voltage | 1.2 V max at IF = 200 mA - defines conduction loss during forward-biased transient events |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package: void-free thermosetting epoxy body (UL94V-0), tin-lead or RoHS-compliant matte-tin plating, cathode indicated by band. Mounting requires 3/8″ (10 mm) lead length from body for full 1.0 W rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; carries forward current or sinks reverse leakage |
| Cathode | Banded end | Connected to higher-potential node; regulates voltage at this terminal during reverse breakdown |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with standardized 1N47xxA series mechanical and electrical definitions for interchangeability |
| 5% voltage tolerance (A suffix) | Guarantees VZ within ±2.8 V of 56 V across production lot and temperature range |
| Plastic P-suffix construction | Delivers lower thermal resistance vs. glass-body (G-suffix) variants-improves power handling in compact layouts |
| Level 1 moisture sensitivity | Enables immediate PCB assembly without baking or dry-pack storage per J-STD-020B |
| RoHS-compliant "e3" option | Meets EU Directive 2011/65/EU with annealed matte-tin plating, solderable per MIL-STD-750 Method 2026 |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator or switching converter error amplifiers. IC Role / Device Role / Timing Role: Provides fixed 56 V reference to comparator or op-amp input for output voltage setpoint. Use Value: Maintains ±5% regulation accuracy across 0.25–2000 mA load, enabling tight output tolerance without trimming. | Use Scenario: Protecting downstream circuitry from transient voltage spikes exceeding 56 V. IC Role / Device Role / Timing Role: Shunts excess energy to ground when input voltage exceeds Zener breakdown threshold. Use Value: Limits clamped voltage to ≤56 V + (IZ × ZZT), with 110 Ω impedance limiting overshoot during fast transients. |
| Bias Network Stabilizer | Temperature-Compensated Reference |
Use Scenario: Setting stable DC bias points for amplifier stages operating over –65°C to +150°C. IC Role / Device Role / Timing Role: Supplies consistent current to transistor bases or op-amp inputs via series resistor. Use Value: Delivers predictable 56 V reference with <5 μA leakage at 42.6 V, minimizing bias drift in high-impedance nodes. | Use Scenario: Combining with negative-TC components (e.g., forward-biased diodes) to achieve near-zero net TC. IC Role / Device Role / Timing Role: Serves as positive-TC element (≈+3.5 mV/°C at 56 V) in compensated reference strings. Use Value: Enables stable composite reference voltages with <100 ppm/°C drift over industrial temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4758A | No TR12 tape-and-reel packaging; bulk or ammo pack only | Lacks automated placement support; suitable for manual or low-volume prototyping | Select 1N4758A when reel packaging is unnecessary and cost minimization is prioritized |
| MMSZ5256ET1G | Surface-mount SOD-123 package; 56 V ±5%, 500 mW rating; 100 Ω ZZT at 10 mA | Lower power and smaller footprint; not drop-in compatible due to package and thermal profile | Choose MMSZ5256ET1G for space-constrained PCBs where 500 mW suffices and reflow is preferred |
Compared with 1N4758AP/TR12, the 1N4758A lacks tape-and-reel delivery but matches all electrical specs, while MMSZ5256ET1G offers SMT compatibility at half the power rating-requiring layout redesign and thermal reassessment.
Availability
1N4758AP/TR12 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and bias network stabilization requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 1N4758AP/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 developed to deliver JEDEC-standardized, high-stability Zener regulation in ruggedized plastic packages for mission-critical power conditioning and protection functions.
FAQ
What is the Zener voltage tolerance for 1N4758AP/TR12?
The 1N4758AP/TR12 has a nominal Zener voltage of 56 V with a ±5% tolerance, as indicated by the "A" suffix in the part number per Microsemi's documentation. This means the actual measured VZ at 4.5 mA test current falls between 53.2 V and 58.8 V under standard test conditions (TL = 25°C ±8°C, 90 s after current application). The tolerance remains valid across the full operating temperature range of –65°C to +150°C.
Does 1N4758AP/TR12 require dry packing before PCB assembly?
No, 1N4758AP/TR12 does not require dry packing prior to assembly. It is classified as Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it can be stored indefinitely at ambient conditions (<30°C/60% RH) and placed directly onto PCBs without baking. This eliminates moisture-related popcorning risk and simplifies manufacturing logistics for high-reliability production lines.
What is the maximum continuous current 1N4758AP/TR12 can regulate at room temperature?
At ambient temperature (TA = 25°C), the 1N4758AP/TR12 can regulate up to approximately 1786 mA continuously, calculated from its 1.0 W power rating and 56 V VZ (P = VZ × IZ → IZ = 1.0 W / 56 V ≈ 17.86 mA). However, the datasheet specifies a maximum regulator current (IZM) of 2000 mA at TA = 50°C-indicating thermal derating begins above 25°C, and sustained operation near 2000 mA requires careful board-level thermal management.
How does the thermal resistance of 1N4758AP/TR12 affect PCB layout?
The 1N4758AP/TR12 has a junction-to-lead thermal resistance of 45 °C/W when mounted with 3/8″ (10 mm) lead length from the body. To achieve full 1.0 W power dissipation, PCB traces must provide adequate copper area (e.g., 4 mm² pads, 1 mm track width, 25 mm length) to limit junction temperature rise. Shorter leads increase thermal resistance, reducing safe operating current-so layout must preserve specified lead length or add thermal vias and copper pours to compensate.
Is 1N4758AP/TR12 RoHS compliant?
Yes, 1N4758AP/TR12 is RoHS compliant when ordered with the "e3" suffix, indicating annealed matte-tin plating per EU Directive 2011/65/EU. The base part number 1N4758AP/TR12 includes this compliance by default per Microsemi's REV C datasheet. It is solderable using standard reflow or wave processes and meets MIL-STD-750 Method 2026 for plating integrity and wetting performance.
1N4758AP/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):
- 56 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 110 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 42.6 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)
1N4758AP/TR12 FAQ
1.How can I place an order for 1N4758AP/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4758AP/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 1N4758AP/TR12 reliable?
The price and inventory of 1N4758AP/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4758AP/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4758AP/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4758AP/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4758AP/TR12?
1N4758AP/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4758AP/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 1N4758AP/TR12?
For technical support, including 1N4758AP/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4758AP/TR12 requirements.
6.How does Aetrix verify that 1N4758AP/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4758AP/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 1N4758AP/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4758AP/TR12?
All 1N4758AP/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4758AP/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 1N4758AP/TR12 part is unused and in its original packaging.
Return procedure for 1N4758AP/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4758AP/TR12 Tags
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