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Microchip Technology 1N4751AP/TR12
- Part No.:
- 1N4751AP/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4751AP/TR12.pdf
- Description:
- DIODE ZENER 30V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:2,152
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Product details
Overview
1N4751AP/TR12 from Microsemi is a 1.0 W, 30 V ±5% Zener diode in DO-41 plastic package, rated for 8.5 mA test current (IZT), 40 Ω dynamic impedance (ZZT), and 22.8 V minimum regulation voltage (VR) at 5 μA reverse current. It operates from –65°C to +150°C and serves as a precision voltage reference or shunt regulator in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the 1N4751AP/TR12 datasheet, 1N4751AP/TR12 pinout, 1N4751AP/TR12 application, or 1N4751AP/TR12 equivalent, key selection criteria include its 30 V nominal Zener voltage, 1.0 W power rating at TL < 105°C, 40 Ω dynamic impedance at 8.5 mA, thermal resistance of 45°C/W (junction-to-lead), and RoHS-compliant "e3" variant availability.
Technical Context
This axial-lead silicon Zener diode functions as a two-terminal shunt voltage regulator, maintaining stable output voltage across wide operating current (0.25–150 mA) and temperature (–65°C to +150°C) ranges. Its sharp breakdown knee-verified by dual-point Zener impedance measurement per MicroNote 202-ensures reliable regulation under transient load conditions.
The device uses void-free thermosetting epoxy encapsulation (UL94V-0), tin-lead or matte-tin plating, and cathode band polarity marking. It is moisture-sensitive Level 1 per J-STD-020B and requires no dry pack, supporting standard reflow and hand-soldering up to 260°C for 10 s.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 30 V ±5% at 8.5 mA - defines nominal regulation point with tight tolerance for stable reference generation |
| Power Dissipation | 1.0 W at TL < 105°C (3/8″ lead length) - sets maximum continuous thermal load without derating |
| Dynamic Impedance (ZZT) | 40 Ω at IZT = 8.5 mA - determines output voltage variation under small-signal AC ripple superimposed on DC bias |
| Reverse Current (IR) | 5 μA max at VR = 22.8 V - specifies leakage threshold below which regulation remains effective |
| Thermal Resistance | 45 °C/W junction-to-lead - enables accurate thermal design when mounted with 10 mm lead length from body |
| Operating Temperature | –65°C to +150°C - supports deployment in industrial, automotive under-hood, and aerospace environments |
| Forward Voltage | 1.2 V max at 200 mA - defines conduction drop during forward-bias fault or ESD clamp operation |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by a single color band. Leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026. Weight: 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; carries forward current or sinks reverse leakage during regulation |
| Cathode | Banded end | Connected to higher-potential node; establishes Zener breakdown voltage referenced to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxAP series | Ensures cross-manufacturer compatibility and standardized test conditions per JEDEC JESD24 |
| 5% Zener voltage tolerance (A suffix) | Reduces calibration overhead in mid-precision voltage reference designs without requiring post-trim |
| Plastic P-suffix construction | Lowers thermal resistance vs. glass-body (G-suffix) variants, improving power handling in compact layouts |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement and baking steps, simplifying SMT and through-hole assembly logistics |
| RoHS-compliant e3 option | Enables compliance with EU RoHS Directive 2011/65/EU without redesign or qualification retesting |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Circuit |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 30 V threshold to TL431-like control ICs or discrete error amplifiers. Use Value: Maintains ±1.5% output regulation across line/load transients due to low 40 Ω ZZT and sharp knee impedance profile. |
Use Scenario: Protects downstream logic inputs from 33 V rail surges in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Passive crowbar element clamping voltage to 30 V before TVS activation or IC damage occurs. Use Value: Absorbs 150 mA peak surge current (ISM) without degradation, extending system MTBF versus ceramic varistors. |
| Programmable Voltage Reference | Temperature-Stable Bias Network |
Use Scenario: Sets reference voltage for ADC front-end gain stages in data acquisition systems. IC Role / Device Role / Timing Role: Precision DC reference source with minimal drift over –40°C to +85°C ambient range. Use Value: Delivers <±0.02%/°C tempco near 30 V, enabling 12-bit accuracy without active compensation. |
Use Scenario: Establishes stable bias point for op-amp input stages in sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Provides low-noise, low-drift DC offset independent of supply rail fluctuations. Use Value: Achieves <10 mV total variation over full temperature range due to tight 5% VZ tolerance and low ZZK (1.0 Ω). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4751A (non-TR, non-P) | Same electrical specs but glass-body (DO-35) package; higher thermal resistance (75°C/W vs. 45°C/W) | Less suitable for high-power-density PCBs where heat dissipation is constrained | Select only if legacy DO-35 footprint compatibility is required and thermal margin exceeds 20°C |
| MMSZ4708T1G (ON Semiconductor) | Surface-mount SOD-123; 30 V ±5%, 500 mW rating, 50 Ω ZZT at 5 mA | Lower power handling and different thermal path; not interchangeable without layout change | Choose for space-constrained designs where automated placement and reflow are prioritized over 1 W capability |
Compared with 1N4751A (glass) and MMSZ4708T1G (SMD), the 1N4751AP/TR12 delivers superior thermal performance in through-hole applications, maintains full 1 W dissipation capability, and supports tape-and-reel automation while retaining JEDEC-standard pinout and test methodology.
Availability
1N4751AP/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, programmable voltage references, and temperature-stable bias networks requiring stable component supply and long-term obsolescence management.
Supply support for 1N4751AP/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 1N4751AP/TR12 belongs to Microsemi's legacy 1N47xxAP Zener diode family, engineered for robust voltage regulation in harsh-environment power systems where stability, longevity, and JEDEC-standard compliance are critical.
FAQ
What is the Zener voltage tolerance of the 1N4751AP/TR12?
The 1N4751AP/TR12 has a nominal Zener voltage of 30 V with a ±5% tolerance, as indicated by the "A" suffix in the part number per JEDEC JESD24. This tolerance applies at 8.5 mA test current and 25°C lead temperature. The 1N4751AP/TR12 is not rated for tighter tolerances like ±1% or ±2%, which require "D" or "C" suffixes respectively.
Does the 1N4751AP/TR12 support RoHS compliance?
Yes, the 1N4751AP/TR12 is available in RoHS-compliant form with the "e3" suffix (e.g., 1N4751AP/TR12e3), using annealed matte-tin plating per MIL-STD-750 Method 2026. Standard versions use tin-lead terminations. Both variants meet UL94V-0 flammability requirements and Level 1 moisture sensitivity classification.
What is the maximum surge current rating for the 1N4751AP/TR12?
The 1N4751AP/TR12 has a maximum surge current (ISM) rating of 1000 mA, measured using a ½ sine-wave pulse of 1/120 second duration at 25°C ambient. This rating applies only for short-duration transients and must be derated per the power derating curve in Figure 1 of the Microsemi datasheet when ambient or lead temperature exceeds 45°C.
How does the "P" suffix in 1N4751AP/TR12 affect package and thermal performance?
The "P" suffix denotes plastic DO-41 (DO-204AL) construction, which provides lower thermal resistance (45°C/W junction-to-lead) compared to glass-body "G" variants (75°C/W). This allows the 1N4751AP/TR12 to sustain full 1.0 W dissipation at higher ambient temperatures and improves reliability in thermally dense layouts.
Can the 1N4751AP/TR12 be used in surface-mount designs?
No - the 1N4751AP/TR12 is an axial-leaded DO-41 device intended for through-hole mounting. For surface-mount equivalents, Microsemi offers the SMAJ4751A and MLL4751A families. These share identical electrical specifications but use DO-214AC (SMA) and SOD-123 packages respectively, requiring PCB footprint and assembly process changes.
1N4751AP/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):
- 30 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 40 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 22.8 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)
1N4751AP/TR12 FAQ
1.How can I place an order for 1N4751AP/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4751AP/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 1N4751AP/TR12 reliable?
The price and inventory of 1N4751AP/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4751AP/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4751AP/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4751AP/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4751AP/TR12?
1N4751AP/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4751AP/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 1N4751AP/TR12?
For technical support, including 1N4751AP/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4751AP/TR12 requirements.
6.How does Aetrix verify that 1N4751AP/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4751AP/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 1N4751AP/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4751AP/TR12?
All 1N4751AP/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4751AP/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 1N4751AP/TR12 part is unused and in its original packaging.
Return procedure for 1N4751AP/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4751AP/TR12 Tags
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MM5Z5V1ST1G
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