My Inquiry
My Account
Microchip Technology 1N4758AUR/TR
- Part No.:
- 1N4758AUR/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N4758AUR/TR.pdf
- Description:
- DIODE ZENER 56V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,113
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N4758AUR/TR from Microsemi is a surface-mount 1.0 W glass-encapsulated Zener diode with a nominal Zener voltage of 56 V, ±5% tolerance, 4.5 mA test current, 110 Ω dynamic impedance at IZT, and 5 μA maximum reverse leakage at 42.6 V. It operates from –65 °C to +175 °C and is used for precision voltage regulation in high-density power supply feedback loops and reference circuits.
For engineers reviewing the 1N4758AUR/TR datasheet, 1N4758AUR/TR pinout, 1N4758AUR/TR application, or 1N4758AUR/TR equivalent, key selection criteria include its DO-213AB MELF glass package, hermetic sealing, radiation-hardened performance per MicroNote 050, low parasitic capacitance, and compatibility with automated SMT assembly under JEDEC-compliant reflow profiles.
Technical Context
This Zener diode functions as a two-terminal voltage reference device operating in reverse breakdown mode. Its regulation behavior is defined by a sharp knee at IZK = 0.25 mA (Zener knee current), with specified dynamic impedance (ZZT = 110 Ω) measured at 4.5 mA DC bias plus 10% RMS AC superimposition.
The device uses a hermetically sealed DO-213AB glass MELF case with cathode band polarity marking, tin-lead or RoHS-compliant matte-tin plating, and is rated for 260 °C soldering (10 s max). Thermal resistance is 50 °C/W junction-to-end-cap and 130 °C/W junction-to-ambient on FR4 with recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 56 V ±5% - stable regulation point for mid-range voltage references in analog and power circuits |
| Power Dissipation | 1.0 W at TEC < 125 °C - supports continuous operation in compact thermal environments |
| Test Current (IZT) | 4.5 mA - standardized bias point for measuring VZ and ZZT; defines optimal regulation zone |
| Dynamic Impedance (ZZT) | 110 Ω @ IZT - quantifies voltage stability under small-signal AC load variations |
| Reverse Leakage (IR) | 5 μA @ 42.6 V - ensures low quiescent current in standby or low-power reference designs |
| Operating Temperature | –65 °C to +175 °C - enables use in aerospace, downhole, and industrial control systems |
| Forward Voltage | ≤1.2 V @ 200 mA - supports bidirectional ESD protection when used in series with other devices |
Pinout & Package
Package: DO-213AB glass MELF (hermetically sealed, leadless cylindrical surface-mount package with cathode band marking).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; forward conduction path during transient events |
| Cathode | Banded end | Connected to higher-potential node; reverse-biased terminal where Zener regulation occurs |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic Glass MELF Construction | DO-213AB package provides moisture immunity, long-term parameter stability, and radiation hardness per MicroNote 050 |
| Tight Voltage Tolerance | ±5% ('A' suffix) enables predictable regulation without post-production trimming in cost-sensitive designs |
| High-Temperature Operation | Rated to +175 °C junction temperature - suitable for engine control units and oilfield electronics |
| Low Parasitic Capacitance | Specified CJ (see Figure 2) supports high-frequency noise suppression in switching regulator feedback paths |
| ESD Insensitivity | No special handling required - simplifies manufacturing and field reliability in unshielded environments |
Applications
| Switching Power Supply Feedback | Industrial Sensor Reference |
|---|---|
|
Use Scenario: Regulates output voltage in isolated flyback or forward converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference element setting error amplifier threshold in secondary-side regulation circuitry. Use Value: 56 V rating allows direct use with common 48 V bus-derived auxiliary supplies; ±5% tolerance ensures consistent loop gain across production lots. |
Use Scenario: Provides stable excitation voltage for resistive bridge sensors in process control transmitters. IC Role / Device Role / Timing Role: Precision voltage reference source for Wheatstone bridge biasing and ADC reference scaling. Use Value: Hermetic glass construction prevents drift due to humidity exposure; 175 °C rating supports operation near hot industrial machinery. |
| Aerospace Voltage Clamp | Automotive ECU Protection |
|
Use Scenario: Clamps transient overvoltage on avionics 28 V DC distribution lines during load dump or lightning-induced surges. IC Role / Device Role / Timing Role: Standby-mode Zener clamp absorbing energy during 100 ms surge events per DO-160 Section 22. Use Value: Radiation-hardened design meets MIL-PRF-19500 screening requirements when ordered with MV prefix; 2000 mA surge rating handles Category A transients. |
Use Scenario: Protects microcontroller I/O pins and CAN transceiver bias rails against ISO 7637-2 pulse 1/2a/3a transients. IC Role / Device Role / Timing Role: Low-capacitance shunt regulator clamping rail voltage during fast-rising edge events. Use Value: DO-213AB geometry minimizes PCB trace inductance; glass body avoids polymer degradation under under-hood thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4758A | Same electrical specs but axial-leaded DO-41 package; no tape-and-reel option | Requires through-hole assembly; unsuitable for high-density SMT layouts | Select 1N4758AUR/TR for automated placement; choose 1N4758A only if legacy board redesign is impractical |
| SMAJ4758A | Same VZ and tolerance, but plastic SMA package; higher ZZT (125 Ω), lower surge rating (1500 mA) | Limited to commercial-grade environments; not radiation-hardened or hermetically sealed | Prefer SMAJ4758A for cost-sensitive consumer applications; retain 1N4758AUR/TR for mil-aero or high-reliability use |
Compared with 1N4758A and SMAJ4758A, the 1N4758AUR/TR uniquely combines hermetic glass packaging, radiation hardness, and SMT compatibility-making it the only choice for space-constrained, high-temperature, mission-critical regulation where long-term parametric stability is non-negotiable.
Availability
1N4758AUR/TR is available at Aetrix Electronics and suitable for switching power supply feedback, industrial sensor reference, aerospace voltage clamp, and automotive ECU protection requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N4758AUR/TR 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 radiation-hardened components for defense, aerospace, and industrial markets.
The 1N4758AUR/TR belongs to Microsemi's legacy surface-mount Zener diode family designed specifically for high-density, high-temperature, and high-reliability voltage regulation-emphasizing hermetic sealing, wide thermal range, and JEDEC-compliant SMT manufacturability.
FAQ
What is the Zener voltage tolerance of the 1N4758AUR/TR?
The 1N4758AUR/TR has a nominal Zener voltage of 56 V with a tolerance of ±5%, indicated by the "A" suffix in the part number. This tolerance is verified at 30 °C with 4.5 mA test current and applies across the full operating temperature range of –65 °C to +175 °C. Tighter tolerances (±2% or ±1%) require alternate suffixes (C or D) and are not applicable to the 1N4758AUR/TR variant.
Is the 1N4758AUR/TR compatible with lead-free reflow processes?
Yes, the 1N4758AUR/TR is RoHS compliant (e3 suffix) and qualified for lead-free reflow soldering at 260 °C for up to 10 seconds. Its matte-tin plating meets MIL-STD-750 Method 2026, and the DO-213AB glass body withstands thermal shock without cracking or delamination during standard J-STD-020-compliant profiles.
How does the 1N4758AUR/TR differ from the through-hole 1N4758A?
The 1N4758AUR/TR shares identical electrical specifications (56 V ±5%, 1.0 W, 110 Ω ZZT) with the axial-leaded 1N4758A but uses a surface-mount DO-213AB glass MELF package instead of DO-41. The "UR/TR" suffix denotes tape-and-reel packaging for automated placement, while the "A" in 1N4758A indicates the same voltage tolerance but different mechanical form factor and assembly method.
What is the maximum surge current rating for the 1N4758AUR/TR?
The 1N4758AUR/TR is rated for a maximum non-repetitive reverse surge current (IS) of 2000 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating supports transient suppression in automotive load-dump and industrial switching events when mounted per the recommended FR4 footprint with 1 oz copper.
Does the 1N4758AUR/TR require derating above 125 °C case temperature?
Yes, the 1N4758AUR/TR must be derated linearly above 125 °C end-cap temperature (TEC), with zero power dissipation at 175 °C. Derating follows a slope of 20 mW/°C (50 °C/W thermal resistance), as shown in Figure 1 of the datasheet. On FR4 boards, ambient temperature derating begins at 45 °C using 130 °C/W junction-to-ambient resistance.
1N4758AUR/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AB, MELF (Glass)
- 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 ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AB (MELF, LL41)
1N4758AUR/TR FAQ
1.How can I place an order for 1N4758AUR/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4758AUR/TR 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 1N4758AUR/TR reliable?
The price and inventory of 1N4758AUR/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4758AUR/TR is usually 5 days.
3.What payment methods are accepted for 1N4758AUR/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4758AUR/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4758AUR/TR?
1N4758AUR/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4758AUR/TR 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 1N4758AUR/TR?
For technical support, including 1N4758AUR/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4758AUR/TR requirements.
6.How does Aetrix verify that 1N4758AUR/TR is sourced from the original manufacturer or authorized distributors?
All 1N4758AUR/TR 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 1N4758AUR/TR meets industry standards.
7.What is the process for return or replacement of 1N4758AUR/TR?
All 1N4758AUR/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4758AUR/TR, 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 1N4758AUR/TR part is unused and in its original packaging.
Return procedure for 1N4758AUR/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4758AUR/TR 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…
