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Microchip Technology SMAJ4750CE3/TR13
- Part No.:
- SMAJ4750CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4750CE3/TR13.pdf
- Description:
- DIODE ZENER 27V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,078
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Product details
Overview
SMAJ4750CE3/TR13 from SM Semiconductor is a 27.0 V, ±2% tolerance Zener diode transient voltage suppressor in SMA (DO-214AC) package, rated for 2.0 W steady-state power dissipation, 68 mA maximum regulator current at 100°C, and 170 mA peak surge current, used for overvoltage protection of I/O lines and signal paths in industrial sensor interfaces.
For engineers reviewing the SMAJ4750CE3/TR13 datasheet, SMAJ4750CE3/TR13 pinout, SMAJ4750CE3/TR13 application, or SMAJ4750CE3/TR13 equivalent, key selection criteria include zener voltage tolerance (±2%), thermal resistance (25°C/W), reverse leakage (≤5 µA at 20.6 V), surge capability (170 mA), and ROHS-compliant matte-tin plating for reliable solderability.
Technical Context
This device operates as a precision voltage-clamping Zener diode with sharp breakdown knee (IZK = 0.25 mA), designed for unidirectional transient suppression in low-energy signal lines. Its 27.0 V nominal breakdown voltage is specified at 9.5 mA test current (IZT), with dynamic impedance of 35 Ω at IZT and knee impedance of 750 Ω at IZK.
The SMAJ4750CE3/TR13 features a void-free thermosetting epoxy case (UL94V-0), cathode band polarity marking, and 0.3 g mass. It maintains regulation across -65°C to +150°C operating temperature range and delivers stable clamping under repetitive surge conditions per 1/2-sine wave pulse (1/120 s duration).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27.0 V ±2% at 9.5 mA - defines precise clamping threshold for signal line protection |
| Power Dissipation | 2.0 W steady-state - supports continuous regulation without derating below 100°C junction |
| Peak Surge Current | 170 mA (1/2-sine, 1/120 s) - withstands common inductive-switching transients |
| Reverse Leakage | ≤5 µA at 20.6 V - ensures minimal standby power loss in high-impedance circuits |
| Thermal Resistance | 25 °C/W (junction-to-lead) - enables direct PCB copper pour heat sinking for sustained operation |
| Operating Temperature | -65°C to +150°C - qualified for under-hood automotive and industrial control environments |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, cathode indicated by band, void-free UL94V-0 epoxy body, 0.3 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side during normal operation; conducts when forward-biased ≥1.2 V |
| Cathode | Reverse breakdown terminal | Connected to protected line; clamps voltage to 27.0 V when transient exceeds breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables tighter clamping window vs. 5% or 10% variants, reducing margin uncertainty in safety-critical sensing |
| 25 °C/W junction-to-lead thermal resistance | Allows effective heat transfer to PCB copper, supporting 2.0 W operation without external heatsink |
| ROHS-compliant matte-tin plating | Ensures consistent wetting and intermetallic formation during reflow, meeting IPC-J-STD-006B requirements |
| UL94V-0 epoxy encapsulation | Provides flame-retardant housing suitable for enclosed industrial enclosures and automotive junction boxes |
Applications
| Industrial Sensor Signal Protection | Automotive Body Control Module I/O |
|---|---|
Use Scenario: Protecting 0–10 V analog output lines of pressure/temperature sensors from ESD and load-dump induced spikes in factory automation PLCs. IC Role / Device Role / Timing Role: Unidirectional voltage clamp placed between sensor output and ADC input, limiting transient excursions to ≤27.0 V. Use Value: Prevents ADC saturation and latch-up while maintaining <5 µA leakage to preserve signal integrity at full scale. | Use Scenario: Safeguarding LIN bus transceiver GPIO pins against battery reversal and alternator load dump in door module ECUs. IC Role / Device Role / Timing Role: Standoff protector on microcontroller I/O lines, activated only during >20.6 V events to avoid false triggering. Use Value: Enables robust 12 V system interoperability without adding series resistance or degrading rise/fall times. |
| Telecom Line Interface Protection | Computer Peripheral USB Data Lines |
Use Scenario: Shielding RS-485 transceiver inputs from lightning-induced surges on outdoor telecom backhaul links. IC Role / Device Role / Timing Role: Primary clamping element in multi-stage protection network, absorbing first 170 mA surge pulse before TVS array engages. Use Value: Extends system-level surge immunity to IEC 61000-4-5 Level 3 (1 kV/2 kV) without increasing board area. | Use Scenario: Suppressing ESD events on USB 2.0 D+/D− lines in docking stations and hub controllers. IC Role / Device Role / Timing Role: Low-capacitance Zener clamp (typical Cj ≈ 50 pF) placed directly at connector, shunting >8 kV HBM transients. Use Value: Meets IEC 61000-4-2 Level 4 (15 kV air, 8 kV contact) without distorting 480 Mbps data eye. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener-based transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4750A | Same 27 V nominal voltage but ±5% tolerance; DO-41 axial package; higher RθJA (65°C/W) | Requires through-hole mounting and larger board space; less precise clamping threshold | Select when cost sensitivity outweighs precision and SMT density requirements |
| SMBJ27CA | Bidirectional 27 V TVS; 600 W peak power; SMA package; 100 A surge rating | Handles both polarities of transients; suited for AC-coupled or floating lines | Choose for differential signal pairs or where reverse polarity events are expected |
Compared with 1N4750A and SMBJ27CA, the SMAJ4750CE3/TR13 offers tighter voltage tolerance and optimized thermal path for SMT signal-line protection, whereas 1N4750A trades precision for legacy through-hole compatibility and SMBJ27CA provides higher surge capacity at the expense of unidirectional operation.
Availability
SMAJ4750CE3/TR13 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body electronics, telecom line protection, and computer peripheral designs requiring stable component supply with guaranteed long-term continuity.
Supply support for SMAJ4750CE3/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
SM Semiconductor is a Taiwan-based manufacturer specializing in discrete semiconductors, including Zener diodes, TVS devices, rectifiers, and bridge rectifiers, with ISO 9001-certified production.
The SMAJ47xxA series is engineered for high-reliability transient suppression in compact SMT layouts, targeting design-in across consumer, industrial, and automotive sectors where precision clamping and thermal performance are critical.
FAQ
What is the exact Zener voltage tolerance of SMAJ4750CE3/TR13?
The SMAJ4750CE3/TR13 has a ±2% Zener voltage tolerance, confirmed by the 'C' suffix in its part number per the manufacturer's documentation. This means its breakdown voltage is guaranteed between 26.46 V and 27.54 V at 9.5 mA test current. The SMAJ4750CE3/TR13 achieves this tighter tolerance via post-package sorting and screening, distinguishing it from ±5% (A-suffix) or ±10% (no suffix) variants in the same family.
Does SMAJ4750CE3/TR13 support bidirectional transient suppression?
No, SMAJ4750CE3/TR13 is a unidirectional Zener diode, configured for single-polarity clamping with cathode as the protected node. It does not suppress negative-going transients beyond its forward voltage (~1.2 V). For bidirectional protection, a dual-diode configuration or a dedicated bidirectional TVS like SMBJ27CA is required. The SMAJ4750CE3/TR13 datasheet explicitly specifies unidirectional operation and cathode-band polarity marking.
What is the maximum allowable reverse voltage (VR) before significant leakage occurs in SMAJ4750CE3/TR13?
The SMAJ4750CE3/TR13 exhibits ≤5 µA reverse leakage current when biased at 20.6 V, which is 76% of its nominal 27.0 V Zener voltage. This VR value is defined in the Electrical Characteristics table as the reverse voltage at which IR is measured. Operating above 20.6 V risks exponential leakage growth and premature breakdown; therefore, 20.6 V serves as the practical upper limit for safe non-conducting bias in circuit design.
Can SMAJ4750CE3/TR13 be used in place of SMAJ4750A?
Yes, SMAJ4750CE3/TR13 can replace SMAJ4750A in most applications, but with improved voltage precision: SMAJ4750A has ±5% tolerance (25.65–28.35 V), while SMAJ4750CE3/TR13 tightens this to ±2% (26.46–27.54 V). Both share identical SMA package, thermal specs, and surge ratings. The SMAJ4750CE3/TR13 is a direct functional upgrade where tighter clamping accuracy is needed without layout changes.
What is the thermal resistance from junction to ambient for SMAJ4750CE3/TR13?
The datasheet specifies only junction-to-lead thermal resistance (RθJL = 25°C/W) for SMAJ4750CE3/TR13-not junction-to-ambient-because its performance depends heavily on PCB copper area and layout. Typical RθJA values range from 150°C/W (minimal pad) to 60°C/W (2 cm² 2-oz copper pour). Engineers must calculate actual junction temperature using measured lead temperature and RθJL, not assumed RθJA, to ensure reliability under 2.0 W steady-state load.
SMAJ4750CE3/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):
- 27 V
- Tolerance:
- ±2%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 35 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 20.6 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
SMAJ4750CE3/TR13 FAQ
1.How can I place an order for SMAJ4750CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4750CE3/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 SMAJ4750CE3/TR13 reliable?
The price and inventory of SMAJ4750CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4750CE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4750CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4750CE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4750CE3/TR13?
SMAJ4750CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4750CE3/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 SMAJ4750CE3/TR13?
For technical support, including SMAJ4750CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4750CE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4750CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4750CE3/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 SMAJ4750CE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4750CE3/TR13?
All SMAJ4750CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4750CE3/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 SMAJ4750CE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4750CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4750CE3/TR13 Tags
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