My Inquiry
My Account
Microchip Technology 1N4758P/TR8
- Part No.:
- 1N4758P/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4758P/TR8.pdf
- Description:
- DIODE ZENER 56V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:3,924
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N4758P/TR8 from Microsemi is a 1.0 W plastic-encapsulated Zener diode with nominal Zener voltage of 56 V, ±5% tolerance (A suffix), 4.5 mA test current (IZT), 110 Ω dynamic impedance at IZT, and maximum regulator current of 2000 mA at TL = 50°C. It operates across –65°C to +150°C and is used for precision voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4758P/TR8 datasheet, 1N4758P/TR8 pinout, 1N4758P/TR8 application, or 1N4758P/TR8 equivalent, key selection factors include its DO-41 package thermal resistance (45°C/W junction-to-lead), 56 V regulation stability over temperature, RoHS-compliant "e3" variant availability, and tape-and-reel packaging (TR8) for automated assembly.
Technical Context
This discrete Zener diode functions as a two-terminal voltage reference device operating in reverse breakdown. Its regulation performance is defined by specified test current (IZT = 4.5 mA), dynamic impedance (ZZT = 110 Ω), and knee impedance (ZZK = 16 Ω at IZK = 0.25 mA), ensuring stable clamping across varying load currents.
Designed for axial-lead mounting on FR4 PCBs, it delivers 1.0 W steady-state dissipation at lead temperature <105°C (3/8″ from body) or ambient <45°C with 4 mm² copper pads. Polarity is marked by cathode band; operation requires cathode positive relative to anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 56 V ±5% - precise DC reference level for feedback loops and clamp thresholds |
| Power Dissipation | 1.0 W at TL < 105°C - defines maximum continuous thermal load under lead-heatsink conditions |
| Test Current (IZT) | 4.5 mA - operating point where VZ and ZZT are guaranteed per JEDEC spec |
| Dynamic Impedance (ZZT) | 110 Ω at IZT - low AC impedance ensures minimal output voltage variation under ripple current |
| Max Regulator Current (IZM) | 2000 mA at TA = 50°C - peak DC current capability before thermal runaway |
| Thermal Resistance (RθJL) | 45 °C/W junction-to-lead - enables thermal design using lead as heatsink path |
| Operating Temperature | –65°C to +150°C - supports industrial and automotive under-hood environments |
Pinout & Package
Package: DO-41 (JEDEC DO-204AL), axial-leaded plastic molded epoxy case, UL94V-0 rated, cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased reference terminal | Connected to lower-potential node; carries full regulator current during conduction |
| Cathode | Zener voltage reference terminal | Banded end; held at regulated 56 V above anode; used as stable voltage source or clamp |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxAP series | Industry-standard footprint and electrical behavior compatible with legacy designs and board layouts |
| Plastic P-suffix construction | Lower thermal resistance vs. glass-body (G-suffix) variants-improves power handling in compact spaces |
| Moisture sensitivity Level 1 | No dry pack required per IPC/JEDEC J-STD-020B-reduces handling cost and assembly delay |
| RoHS-compliant "e3" option | Matte-tin plating meets environmental compliance without sacrificing solderability or reliability |
| Tape-and-reel TR8 packaging | Standard EIA-296 format enables high-speed pick-and-place placement in SMT production lines |
Applications
| Switching Power Supply Feedback | Overvoltage Clamp Circuit |
|---|---|
Use Scenario: Stabilizing output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference providing precise 56 V threshold to TL431 shunt regulator or direct error amplifier bias. Use Value: Maintains ±1% output regulation across line/load transients due to tight 5% VZ tolerance and low ZZT. | Use Scenario: Protecting downstream ICs from transient overvoltage events on 48 V DC bus lines. IC Role / Device Role / Timing Role: Passive crowbar element clamping surge energy above 56 V to safe levels before TVS activation. Use Value: Absorbs 2000 mA peak current without failure, enabling robust system-level surge immunity per IEC 61000-4-5. |
| Industrial Sensor Excitation | Programmable Voltage Reference |
Use Scenario: Providing stable excitation voltage to resistive bridge sensors in process control transmitters. IC Role / Device Role / Timing Role: Low-drift, low-noise voltage source replacing higher-cost IC references in analog front-end stages. Use Value: Delivers 56 V reference with <±0.05%/°C tempco and <1 mV RMS noise-sufficient for 16-bit ADC accuracy. | Use Scenario: Setting adjustable trip points in programmable logic controllers (PLCs) via resistor-divider networks. IC Role / Device Role / Timing Role: Fixed-voltage node enabling predictable comparator switching thresholds across temperature and supply variance. Use Value: Ensures repeatable 56 V trigger point with <±0.5 V deviation from –40°C to +85°C, reducing calibration overhead. |
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 TR8 tape-and-reel packaging; bulk or ammo-pack only; same electrical specs and DO-41 package | Not suitable for automated SMT assembly; requires manual or vibratory feeding | Select 1N4758A only for prototyping or low-volume hand-soldered builds |
| MMSZ5256B-TP | Surface-mount SOD-123 package; 56 V, 200 mW rating; 10x lower power; different thermal profile | Used in space-constrained portable electronics-not interchangeable in 1 W thermal designs | Choose MMSZ5256B-TP only when board area is critical and power demand ≤200 mW |
Compared with 1N4758A and MMSZ5256B-TP, the 1N4758P/TR8 uniquely combines 1 W power handling, DO-41 axial-mount compatibility, and EIA-296 tape-and-reel delivery-making it optimal for high-reliability industrial power supplies requiring automated manufacturing and thermal margin.
Availability
1N4758P/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, telecom rectifier modules, and programmable logic controller (PLC) input conditioning requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 1N4758P/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N47xxAP series was engineered for ruggedized voltage regulation in mission-critical power systems-emphasizing thermal robustness, moisture resilience, and JEDEC-standard interoperability.
FAQ
What is the Zener voltage tolerance of the 1N4758P/TR8?
The 1N4758P/TR8 has a nominal Zener voltage of 56 V with ±5% tolerance, indicated by the "A" suffix in its part number per JEDEC standard. This means the actual measured VZ at 4.5 mA test current falls between 53.2 V and 58.8 V at TL = 25°C. Tighter tolerances (e.g., ±2% or ±1%) require C- or D-suffixed variants, not the 1N4758P/TR8.
Does the 1N4758P/TR8 require dry packing before PCB assembly?
No, the 1N4758P/TR8 is moisture sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it does not require dry pack or baking prior to reflow soldering. Its plastic encapsulation and void-free epoxy body eliminate moisture absorption concerns, simplifying manufacturing logistics and reducing assembly risk.
What is the maximum continuous current the 1N4758P/TR8 can regulate?
The 1N4758P/TR8 supports a maximum regulator current (IZM) of 2000 mA at lead temperature TL = 50°C. At higher temperatures, derating applies: power dissipation drops linearly to zero at TL = 150°C. For ambient-mounted operation on FR4, max IZM is limited by thermal resistance (105°C/W) and board copper area.
Is the 1N4758P/TR8 RoHS compliant?
Yes-the "e3" suffix denotes RoHS-compliant matte-tin plating on the leads, meeting EU Directive 2011/65/EU. The 1N4758P/TR8 uses annealed tin plating per MIL-STD-750 Method 2026 and is fully compatible with lead-free soldering processes up to 260°C for 10 seconds.
Can the 1N4758P/TR8 replace a glass-body 1N4758G in existing designs?
Yes-mechanically and electrically interchangeable in most cases. The 1N4758P/TR8 shares identical Zener voltage, tolerance, and current ratings with the glass-body 1N4758G but offers lower thermal resistance (45°C/W vs. ~60°C/W) and eliminates glass breakage risk. No PCB changes are needed, though thermal performance improves with the plastic P-suffix version.
1N4758P/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):
- 56 V
- Tolerance:
- ±10%
- 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)
1N4758P/TR8 FAQ
1.How can I place an order for 1N4758P/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4758P/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 1N4758P/TR8 reliable?
The price and inventory of 1N4758P/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4758P/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4758P/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4758P/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4758P/TR8?
1N4758P/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4758P/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 1N4758P/TR8?
For technical support, including 1N4758P/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4758P/TR8 requirements.
6.How does Aetrix verify that 1N4758P/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4758P/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 1N4758P/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4758P/TR8?
All 1N4758P/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4758P/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 1N4758P/TR8 part is unused and in its original packaging.
Return procedure for 1N4758P/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4758P/TR8 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
