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Microchip Technology SMAJ4737CE3/TR13
- Part No.:
- SMAJ4737CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4737CE3/TR13.pdf
- Description:
- DIODE ZENER 7.5V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,337
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Product details
Overview
SMAJ4737CE3/TR13 from SM Microelectronics is a 7.5 V, 5% tolerance Zener diode in SMA (DO-214AC) package, rated for 2.0 W steady-state power dissipation, 34 mA test current, and 242 mA maximum regulator current at 100°C junction temperature. It serves as a precision voltage reference and transient overvoltage clamp in low-profile DC power rails.
For engineers reviewing the SMAJ4737CE3/TR13 datasheet, SMAJ4737CE3/TR13 pinout, SMAJ4737CE3/TR13 application, or SMAJ4737CE3/TR13 equivalent, key selection criteria include zener voltage tolerance (±5%), thermal resistance (25°C/W), surge current capability (605 A), reverse leakage (≤10 µA at 5.0 V), and ROHS-compliant matte-tin plating for reliable solderability.
Technical Context
This device operates as a silicon planar Zener diode with sharp breakdown knee, specified for regulation across wide current (1.0–34 mA) and temperature (-65°C to +150°C) ranges. Its 7.5 V nominal zener voltage is measured at 34 mA test current (IZT), with dynamic impedance of 4.0 Ω and knee impedance of 0.50 Ω at 0.5 mA.
The SMAJ4737CE3/TR13 exhibits 10 µA maximum reverse leakage at 5.0 V (VR), supports 605 A peak surge current (Izsm) under 1/2 sine wave conditions, and maintains stable regulation due to low thermal resistance (25°C/W) between junction and lead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V ±5% at 34 mA - precise clamping threshold for 5 V–12 V rail protection |
| Power Dissipation (PM(AV)) | 2.0 W - enables continuous regulation without heatsink in low-power circuits |
| Dynamic Impedance (ZZT) | 4.0 Ω at IZT - ensures minimal voltage shift under load transients |
| Reverse Leakage (IR) | ≤10 µA at VR = 5.0 V - prevents excessive standby current in battery-powered systems |
| Surge Current (Izsm) | 605 A - withstands IEC 61000-4-5 Level 4 line surges when properly mounted |
| Thermal Resistance (RθJL) | 25 °C/W - allows direct PCB copper pour heat sinking for sustained 242 mA operation |
| Operating Temperature | -65°C to +150°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, void-free thermosetting epoxy case with cathode band marking; weight ≈0.3 g; ROHS-compliant matte-tin terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink during forward bias; reference node during reverse breakdown | Connected to lower-potential side of protected circuit (e.g., GND or return path) |
| Cathode | Current source during reverse breakdown; clamping node | Connected to protected line (e.g., 5 V rail); band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Enables tighter regulation margin vs. 10% variants-critical for 3.3 V/5 V logic rail clamping |
| 2.0 W steady-state rating | Supports sustained clamping in 12 V automotive accessory circuits without derating |
| Low dynamic impedance (4.0 Ω) | Minimizes voltage overshoot during fast ESD events (<10 ns rise time) |
| ROHS-compliant matte-tin plating | Ensures consistent wetting and intermetallic formation per MIL-STD-750 Method 2026 |
| Cathode band polarity marking | Eliminates orientation errors during automated placement on high-density PCBs |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting LIN bus transceiver inputs against load-dump-induced transients in door module ECUs. IC Role / Device Role / Timing Role: Zener clamp limiting input voltage to ≤12 V during 24 V load dump events. Use Value: Prevents latch-up in MAX13041 transceivers by holding input below absolute maximum rating (16 V). | Use Scenario: Stabilizing 5 V reference for 16-bit ADCs measuring thermocouple outputs in PLC analog input cards. IC Role / Device Role / Timing Role: Precision shunt reference providing low-noise, temperature-stable bias point. Use Value: Maintains <±0.5% reference accuracy over -40°C to +85°C due to tight 5% VZ tolerance and low ZZT. |
| Consumer USB-C Power Delivery | Telecom DSL Line Interface |
Use Scenario: Clamping CC line voltage during hot-plug insertion transients in USB-C port controllers. IC Role / Device Role / Timing Role: Fast-response overvoltage suppressor on 3.3 V CC detection circuitry. Use Value: Limits CC pin excursion to <4.0 V within 100 ns, preventing false PD contract initiation. | Use Scenario: Protecting ADSL2+ line driver outputs from lightning-induced surges on twisted-pair copper lines. IC Role / Device Role / Timing Role: Primary surge suppression element before TI THS6012 driver stage. Use Value: Absorbs 10/700 µs telecom surge pulses up to 605 A without degradation (per ITU-T K.21). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C7V5 | 300 mW SOT-23 package; 7.5 V ±5%; higher ZZT (15 Ω) | Limited to low-energy signal-line clamping; unsuitable for >100 mA surge duty | Select for space-constrained signal nodes where 2.0 W rating is unnecessary |
| 1N4733A | 1.0 W DO-41 package; 7.5 V ±5%; RθJL = 50°C/W; Izsm = 300 A | Requires axial-lead mounting and larger board area; lower surge robustness | Select for legacy through-hole designs or cost-sensitive non-automotive applications |
Compared with SMAJ4737CE3/TR13, BZX84-C7V5 trades power handling for footprint reduction, while 1N4733A sacrifices surge capacity and thermal performance for manufacturing familiarity-neither offers drop-in replacement due to package or rating mismatch.
Availability
SMAJ4737CE3/TR13 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, consumer USB-C PD ports, and telecom line protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ4737CE3/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 Microelectronics is a Taiwan-based semiconductor manufacturer specializing in discrete power devices, including Zener diodes, TVS diodes, and rectifiers for industrial and automotive markets.
The SMAJ47xxA series was designed specifically for high-reliability transient voltage suppression in compact surface-mount applications where thermal performance and surge robustness are critical.
FAQ
What is the zener voltage tolerance of SMAJ4737CE3/TR13?
The SMAJ4737CE3/TR13 has a zener voltage tolerance of ±5%, meaning its breakdown voltage is guaranteed between 7.13 V and 7.88 V at 34 mA test current. This tighter tolerance compared to standard 10% variants (e.g., SMAJ4737A) improves regulation accuracy in precision reference and clamping applications where voltage margin is constrained.
Does SMAJ4737CE3/TR13 meet ROHS requirements?
Yes, SMAJ4737CE3/TR13 uses ROHS-compliant annealed matte-tin plating on its terminals, verified per MIL-STD-750 Method 2026 for solderability. The void-free thermosetting epoxy case also complies with UL94V-0 flammability standards, making it suitable for environmentally regulated industrial and automotive production.
What is the maximum surge current rating for SMAJ4737CE3/TR13?
The SMAJ4737CE3/TR13 is rated for 605 A peak surge current (Izsm) under standardized 1/2 sine wave conditions (1/120 second duration). This value is confirmed in Table 1 of the official SM Microelectronics datasheet and reflects capability to absorb IEC 61000-4-5 Level 4 surges when mounted with adequate PCB copper area.
Can SMAJ4737CE3/TR13 be used as a voltage reference in analog circuits?
Yes, SMAJ4737CE3/TR13 can serve as a stable voltage reference in analog circuits due to its low dynamic impedance (4.0 Ω), tight 5% tolerance, and regulation over 1.0–34 mA current range. Its 25°C/W thermal resistance supports stable operation in buffered reference designs where self-heating is managed via PCB layout.
What is the reverse leakage current specification for SMAJ4737CE3/TR13?
The SMAJ4737CE3/TR13 specifies a maximum reverse leakage current (IR) of 10 µA at 5.0 V reverse voltage (VR), measured at 25°C. This low leakage ensures minimal power loss in battery-backed systems and prevents unintended biasing of downstream CMOS inputs in always-on monitoring circuits.
SMAJ4737CE3/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):
- 7.5 V
- Tolerance:
- ±2%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 4 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 5 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
SMAJ4737CE3/TR13 FAQ
1.How can I place an order for SMAJ4737CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4737CE3/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 SMAJ4737CE3/TR13 reliable?
The price and inventory of SMAJ4737CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4737CE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4737CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4737CE3/TR13 transactions.
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4.How is shipping managed for SMAJ4737CE3/TR13?
SMAJ4737CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4737CE3/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 SMAJ4737CE3/TR13?
For technical support, including SMAJ4737CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4737CE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4737CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4737CE3/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 SMAJ4737CE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4737CE3/TR13?
All SMAJ4737CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4737CE3/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 SMAJ4737CE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4737CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4737CE3/TR13 Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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