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Microchip Technology SMAJ4756CE3/TR13
- Part No.:
- SMAJ4756CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4756CE3/TR13.pdf
- Description:
- DIODE ZENER 47V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,005
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Product details
Overview
SMAJ4756CE3/TR13 from Microsemi (now Microchip Technology) is a 2 W surface-mount silicon Zener diode with a nominal zener voltage of 47 V ±2%, 5.5 mA test current, 80 Ω dynamic impedance at IZT, and 35.8 V minimum knee voltage. It provides precision voltage regulation in power supply feedback loops and overvoltage protection circuits for industrial DC-DC converters.
For engineers reviewing the SMAJ4756CE3/TR13 datasheet, SMAJ4756CE3/TR13 pinout, SMAJ4756CE3/TR13 application, or SMAJ4756CE3/TR13 equivalent, key selection criteria include its 2% voltage tolerance, DO-214AC (SMAJ) package thermal resistance of 25°C/W, 1500 mA peak surge current rating, and -55°C to +150°C operating temperature range.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and line conditions. Its 2 W steady-state power dissipation is rated with 4.0 mm² copper pads per terminal, and thermal derating begins linearly above 100°C ambient.
The device features a sharp breakdown knee (ZZK = 1500 Ω at IZK = 0.25 mA), low leakage (<5 µA at 35.8 V), and compliance with JEDEC DO-214AC mechanical standards-despite a slightly larger maximum dimension (0.115" vs. standard 0.105") noted in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 47 V ±2% - enables precise 47 V regulation in feedback networks with tight tolerance control |
| Test Current (IZT) | 5.5 mA - defines operating point for specified VZ and ZZT measurements |
| Dynamic Impedance (ZZT) | 80 Ω @ IZT - determines output voltage variation under load changes in shunt regulator designs |
| Peak Surge Current (IS) | 1500 mA - supports transient overvoltage clamping without failure during 1/120 s pulses |
| Steady-State Power (PAV) | 2.0 W - requires 4.0 mm² copper pad area per terminal for thermal management |
| Operating Temperature | -55°C to +150°C - suitable for under-hood automotive and industrial environments |
| Thermal Resistance (RθJL) | 25°C/W - quantifies junction-to-lead thermal path efficiency for PCB layout planning |
Pinout & Package
Package: DO-214AC (SMAJ), surface-mount, cathode indicated by band. Dimensions conform to JEDEC DO-214AC with note that maximum 'A' dimension is 0.115" (2.92 mm), exceeding standard 0.105". Polarity is unambiguous; terminals are solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection | Connected to ground or lower potential node in shunt regulation or clamp configurations |
| Cathode | Zener breakdown terminal / high-side connection | Connected to regulated rail or protected node; voltage referenced to anode during reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| 2% Zener voltage tolerance ('C' suffix) | Enables tighter regulation accuracy than standard 5% or 10% variants in closed-loop feedback paths |
| 2 W power dissipation capability | Supports higher continuous shunt current than 1 W Zeners, reducing need for external series resistors |
| 1500 mA peak surge current rating | Withstands repetitive transients (e.g., ISO 7637-2 Pulse 1/2a) without degradation in automotive ECU protection |
| DO-214AC surface-mount package | Provides flat handling surface for accurate pick-and-place placement and reliable reflow soldering |
| JEDEC 1N47xxA electrical equivalence | Allows drop-in replacement for legacy through-hole 1N4756A in redesigns where board space permits SMT conversion |
Applications
| Power Supply Feedback Regulation | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Used in the feedback divider of isolated DC-DC converters to regulate output voltage within ±2%. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 47 V reference to optocoupler or error amplifier input. Use Value: Tight 2% tolerance ensures output voltage remains within spec across temperature and line variations without trimming. | Use Scenario: Placed across sensitive 48 V bus lines to limit transient spikes from motor switching or relay bounce. IC Role / Device Role / Timing Role: Passive clamping element diverting surge energy to ground when voltage exceeds 47 V. Use Value: 1500 mA surge rating handles repeated 100 V/100 ns transients without parametric shift or failure. |
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) |
Use Scenario: Protects analog front-end inputs of 4–20 mA loop receivers from induced surges on long cable runs. IC Role / Device Role / Timing Role: Reverse-biased Zener limiting input voltage to 47 V while presenting minimal capacitance to signal path. Use Value: Low dynamic impedance (80 Ω) minimizes loading effect on high-impedance sensor outputs. | Use Scenario: Clamps CAN transceiver power rails against load dump events in 12 V vehicle systems. IC Role / Device Role / Timing Role: Secondary overvoltage protection stage downstream of primary TVS, absorbing residual energy. Use Value: -55°C to +150°C rating ensures reliability in engine bay mounting locations with extreme thermal cycling. |
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; same 47 V ±5% rating; 1 W power rating | Requires PCB through-hole footprint; lower surge and power capability limits use in high-energy clamping | Select when legacy through-hole assembly is required and thermal/power demands are ≤1 W |
| BZX84-C47 | SOT-23 package; 47 V ±5%; 300 mW power; higher ZZT (~100 Ω) | Smaller size but lower power and surge rating; unsuitable for 2 W continuous or 1500 mA pulse loads | Select only for low-power signal-level referencing where board space is critical and surge exposure is minimal |
Compared with 1N4756A and BZX84-C47, SMAJ4756CE3/TR13 delivers higher power handling (2 W), superior surge robustness (1500 mA), and tighter 2% voltage tolerance-making it optimal for industrial and automotive power rail protection where reliability under stress is mandatory.
Availability
SMAJ4756CE3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and sensor interface circuits requiring stable component supply, consistent Zener voltage tolerance, and high-surge-capability discrete protection.
Supply support for SMAJ4756CE3/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 was designed for surface-mount voltage regulation and transient suppression in demanding industrial, aerospace, and automotive applications where precision, surge resilience, and thermal stability are critical.
FAQ
What is the Zener voltage tolerance of SMAJ4756CE3/TR13?
The 'C' suffix in SMAJ4756CE3/TR13 denotes a 2% tolerance on the nominal 47 V Zener voltage, meaning the actual measured VZ falls between 46.06 V and 47.94 V at 5.5 mA test current and 25°C. This tighter tolerance supports precision regulation in feedback loops where ±5% variants would introduce unacceptable output variation.
Can SMAJ4756CE3/TR13 replace 1N4756A in existing designs?
Yes, SMAJ4756CE3/TR13 is electrically equivalent to 1N4756A per the manufacturer's documentation and shares the same 47 V nominal Zener voltage. However, it uses a DO-214AC surface-mount package versus DO-41 through-hole, so PCB layout must be updated. Its 2 W rating and 1500 mA surge capability exceed the 1 W/1000 mA of 1N4756A, enabling enhanced robustness.
What is the maximum steady-state power dissipation for SMAJ4756CE3/TR13?
SMAJ4756CE3/TR13 has a steady-state power dissipation (PAV) of 2.0 W at 25°C, measured with 4.0 mm² copper pads per terminal. Above 100°C lead temperature, power must be derated linearly to zero at 150°C. This rating assumes proper PCB thermal design-insufficient copper area will cause premature thermal shutdown or failure.
How is polarity identified on SMAJ4756CE3/TR13?
Polarity on SMAJ4756CE3/TR13 is indicated by a cathode band marked on the body end of the DO-214AC package. The banded end is the cathode; the opposite end is the anode. This marking aligns with JEDEC DO-214AC standards and must be observed during placement to ensure correct reverse-bias operation in Zener regulation or clamping circuits.
What is the peak surge current rating for SMAJ4756CE3/TR13?
SMAJ4756CE3/TR13 is rated for a peak surge current (IS) of 1500 mA, measured using a ½ sine wave or equivalent 1/120 second pulse at 25°C ambient. This rating applies to single-event transients and reflects the device's ability to absorb short-duration energy without parametric shift-critical for protecting 48 V systems against ISO 7637-2 pulses.
SMAJ4756CE3/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:
- ±2%
- 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
SMAJ4756CE3/TR13 FAQ
1.How can I place an order for SMAJ4756CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4756CE3/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 SMAJ4756CE3/TR13 reliable?
The price and inventory of SMAJ4756CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4756CE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4756CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4756CE3/TR13 transactions.
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4.How is shipping managed for SMAJ4756CE3/TR13?
SMAJ4756CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4756CE3/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 SMAJ4756CE3/TR13?
For technical support, including SMAJ4756CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4756CE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4756CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4756CE3/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 SMAJ4756CE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4756CE3/TR13?
All SMAJ4756CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4756CE3/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 SMAJ4756CE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4756CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4756CE3/TR13 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZX84C3V3LT1G
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MMSZ5245BS-7-F
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MM5Z5V1ST1G
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