My Inquiry
My Account
Microchip Technology SMAJ4756AE3/TR13
- Part No.:
- SMAJ4756AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4756AE3/TR13.pdf
- Description:
- DIODE ZENER 47V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,834
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ4756AE3/TR13 from Microsemi (now Microchip Technology) is a 47 V, 5% tolerance, 2 W surface-mount Zener diode in DO-214AC (SMA) package, rated for 35.8 V minimum reverse breakdown at 5.5 mA test current, 80 Ω dynamic impedance, and 95 A peak surge current - used for voltage regulation and overvoltage protection in DC power rails.
For engineers reviewing the SMAJ4756AE3/TR13 datasheet, SMAJ4756AE3/TR13 pinout, SMAJ4756AE3/TR13 application, or SMAJ4756AE3/TR13 equivalent, key selection criteria include Zener voltage tolerance, surge current capability, thermal resistance (25°C/W), cathode-band polarity marking, and JEDEC DO-214AC mechanical compatibility.
Technical Context
This device operates as a precision voltage reference and transient clamp by maintaining stable reverse breakdown across its specified current range (5.5 mA IZT, 0.25 mA IZK). Its 80 Ω dynamic impedance at IZT ensures low regulation error under load variation.
Designed for surface-mount assembly with flat handling surface and UL94V-0 flame-retardant epoxy, it supports soldering up to 260°C for 10 seconds and exhibits full operational range from –55°C to +150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 47 V ±5% - defines nominal regulation point under 5.5 mA DC bias |
| Test Current (IZT) | 5.5 mA - required DC current to achieve specified VZ at thermal equilibrium |
| Dynamic Impedance (ZZT) | 80 Ω - small-signal AC resistance affecting regulation accuracy under varying load |
| Peak Surge Current (IS) | 95 A - maximum non-repetitive 1/120 sec half-sine pulse the device withstands without failure |
| Power Dissipation (PAV) | 2.0 W - steady-state DC power limit when mounted on 4.0 mm² copper pads per terminal |
| Thermal Resistance (RθJL) | 25°C/W - junction-to-lead thermal resistance determining temperature rise under power dissipation |
| Reverse Leakage (IR) | 5 µA max @ 35.8 V - ensures minimal standby current in clamping applications |
Pinout & Package
DO-214AC (SMA) surface-mount package with molded plastic body, cathode indicated by a single band near one end. Dimensions conform to JEDEC standard except maximum length (0.115″ vs. standard 0.105″), enabling reliable pick-and-place placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of regulated rail; carries forward current during non-clamping state |
| Cathode | Reverse breakdown terminal | Marked with band; connected to higher-potential side; conducts when reverse voltage exceeds 47 V |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount flat handling surface | Enables accurate automated placement and consistent coplanarity on PCBs |
| JEDEC DO-214AC mechanical equivalence | Ensures compatibility with existing SMA footprint tooling and reflow profiles |
| 260°C / 10 s soldering tolerance | Supports standard lead-free reflow processes without degradation |
| UL94V-0 flame retardant epoxy | Meets safety requirements for industrial and consumer equipment enclosures |
| –55°C to +150°C operating range | Validates use in automotive under-hood, industrial motor drives, and outdoor power systems |
Applications
| DC Power Rail Regulation | Overvoltage Transient Clamping |
|---|---|
Use Scenario: Stabilizing 48 V intermediate bus in telecom power supplies where ±5% output tolerance is acceptable. IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator to maintain fixed reference voltage across load variations. Use Value: Delivers 47 V regulation with 80 Ω dynamic impedance, minimizing output deviation under 5.5–38 mA load current swing. | Use Scenario: Protecting input stage of industrial PLC analog inputs against ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Fast-acting voltage clamp limiting transient excursions above 47 V before downstream IC damage occurs. Use Value: Withstands 95 A peak surge current (1/120 sec), absorbing energy without catastrophic failure during IEC 61000-4-5 tests. |
| Reference Voltage Source | Field-Serviceable Voltage Calibration |
Use Scenario: Providing stable 47 V reference for high-side current sensing in battery management systems. IC Role / Device Role / Timing Role: Precision Zener serving as voltage reference for op-amp comparator thresholds. Use Value: 5% tolerance and 25°C/W thermal resistance ensure <±0.5 V drift over –40°C to +85°C ambient with proper heatsinking. | Use Scenario: Enabling field replacement of failed voltage references in legacy instrumentation without board redesign. IC Role / Device Role / Timing Role: Drop-in compatible Zener matching footprint and electrical behavior of original 1N4756A design. Use Value: Electrically equivalent to JEDEC 1N4756A and mechanically compatible with DO-214AC land pattern, simplifying repair logistics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4756A | Through-hole DO-41 package; identical 47 V ±5%, 2 W rating, same electrical specs | Requires through-hole assembly; not suitable for SMT-only production | Select when legacy through-hole design or manual prototyping is required |
| SMLJ4756A | Same Zener voltage and tolerance, but 3 W power rating and DO-214AB (SMB) package | Higher power handling and larger footprint; requires PCB layout change | Select when >2 W surge energy absorption or extended thermal margin is needed |
Compared with SMAJ4756AE3/TR13, 1N4756A offers identical regulation performance but mandates through-hole mounting, while SMLJ4756A provides higher surge robustness at the cost of larger footprint and revised thermal path - choice depends on assembly method and power derating requirements.
Availability
SMAJ4756AE3/TR13 is available at Aetrix Electronics and suitable for DC power rail regulation, overvoltage transient clamping, and reference voltage source applications requiring stable component supply and full traceability.
Supply support for SMAJ4756AE3/TR13 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 (acquired by Microchip Technology in 2018) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components.
The SMAJ47xxA series belongs to Microsemi's silicon Zener diode product line, engineered for robust voltage regulation and transient suppression in industrial, telecom, and aerospace power systems.
FAQ
What is the Zener voltage tolerance of SMAJ4756AE3/TR13?
SMAJ4756AE3/TR13 has a nominal Zener voltage of 47 V with a ±5% tolerance, meaning the actual breakdown voltage falls between 44.65 V and 49.35 V at 5.5 mA test current and 25°C. This tolerance is confirmed in the manufacturer's datasheet MSC0284A and applies to all units marked "SMAJ4756A" without additional suffixes.
Does SMAJ4756AE3/TR13 support lead-free reflow soldering?
Yes, SMAJ4756AE3/TR13 supports lead-free reflow soldering with a maximum temperature of 260°C for 10 seconds, as specified in the mechanical data section of the datasheet. Its DO-214AC package and UL94V-0 epoxy meet IPC-J-STD-020 moisture sensitivity level (MSL) requirements for standard SMT processes.
What is the maximum steady-state power dissipation for SMAJ4756AE3/TR13?
The maximum steady-state power dissipation for SMAJ4756AE3/TR13 is 2.0 W at 25°C ambient, measured when mounted on 4.0 mm² copper pads per terminal. Power must be linearly derated above 100°C lead temperature, reaching zero at 150°C, per Note 3 in the Maximum Ratings table.
How is polarity indicated on SMAJ4756AE3/TR13?
Polarity on SMAJ4756AE3/TR13 is indicated by a single cathode band located near one end of the DO-214AC package body. The banded end is the cathode; the opposite end is the anode. This marking aligns with JEDEC DO-214AC standard and is visible under standard optical inspection.
What surge current rating does SMAJ4756AE3/TR13 have?
SMAJ4756AE3/TR13 has a peak surge current rating of 95 A, measured using a 1/120 second half-sine wave pulse at 25°C ambient. This value reflects non-repetitive transient energy absorption capability and is validated per Note 3 in the Electrical Characteristics table of the official datasheet.
SMAJ4756AE3/TR13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 47 V
- Tolerance:
- ±5%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 35.8 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC
SMAJ4756AE3/TR13 FAQ
1.How can I place an order for SMAJ4756AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4756AE3/TR13 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 SMAJ4756AE3/TR13 reliable?
The price and inventory of SMAJ4756AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4756AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4756AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4756AE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4756AE3/TR13?
SMAJ4756AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4756AE3/TR13 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 SMAJ4756AE3/TR13?
For technical support, including SMAJ4756AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4756AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4756AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4756AE3/TR13 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 SMAJ4756AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4756AE3/TR13?
All SMAJ4756AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4756AE3/TR13, 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 SMAJ4756AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4756AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4756AE3/TR13 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…
