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Microchip Technology SMAJ4737E3/TR13
- Part No.:
- SMAJ4737E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4737E3/TR13.pdf
- Description:
- DIODE ZENER 7.5V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,712
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Product details
Overview
SMAJ4737E3/TR13 from Vishay Semiconductor 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, used for precision voltage regulation and transient overvoltage clamping in low-profile power supply rails.
For engineers reviewing the SMAJ4737E3/TR13 datasheet, SMAJ4737E3/TR13 pinout, SMAJ4737E3/TR13 application, or SMAJ4737E3/TR13 equivalent, key selection factors include zener voltage tolerance (±5%), thermal resistance (25°C/W), surge current capability (605 A), reverse leakage (≤10 µA at 5.0 V), and DO-214AC mechanical compatibility with high-density PCB layouts.
Technical Context
This device operates as a silicon planar Zener diode optimized for stable voltage reference and transient suppression in DC power conditioning circuits. It maintains regulation across a wide operating current range (0.25–34 mA) and temperature span (–65°C to +150°C), with sharp breakdown knee ensured by dual-point impedance measurement per MIL-STD-750.
The SMAJ4737E3/TR13 exhibits 4.0 Ω dynamic impedance at 34 mA test current and ≤0.5 mA knee current at 1.0 V, enabling predictable clamping behavior during fast transients. Its void-free thermosetting epoxy case meets UL94V-0 flammability rating and supports lead-free soldering per MIL-STD-750 Method 2026.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 7.5 V ±5% at 34 mA - defines precise clamping threshold for 5 V rail protection |
| Power Dissipation PM(AV) | 2.0 W - sets continuous thermal limit without heatsink under standard lead conditions |
| Dynamic Impedance ZZT | 4.0 Ω at IZT = 34 mA - ensures minimal voltage shift under load variation |
| Surge Current IZSM | 605 A - supports single-pulse transient suppression per 1/2-sine wave standard |
| Reverse Leakage IR | ≤10 µA at VR = 5.0 V - guarantees low standby power loss in always-on circuits |
| Thermal Resistance RθJL | 25 °C/W - enables accurate junction temperature estimation from lead temperature |
| Operating Temperature | –65°C to +150°C - validated for automotive under-hood and industrial control environments |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, cathode-indicated band, 0.3 g weight, void-free UL94V-0 epoxy body, matte-tin plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink terminal in reverse-bias operation | Connected to lower-potential node (e.g., GND or return path) during clamping |
| Cathode | Current source terminal in reverse-bias operation | Connected to protected line (e.g., 5 V rail); band marks this terminal |
Key Features
| Feature | Design Value |
|---|---|
| 5% zener voltage tolerance | Enables tighter regulation than 10% variants (e.g., SMAJ4737) in feedback-sensitive designs |
| 2.0 W steady-state power rating | Supports sustained clamping in 12 V automotive subsystems without derating below 100°C |
| DO-214AC low-profile package | Reduces board footprint by >40% vs. DO-41 while maintaining axial-lead mounting flexibility |
| UL94V-0 epoxy encapsulation | Meets fire-safety requirements for enclosed industrial power modules and telecom equipment |
| ROHS-compliant matte-tin plating | Ensures reliable solder wetting and intermetallic formation in lead-free reflow profiles |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Clamping induced transients on 5 V microcontroller supply lines during solenoid switching in engine control units. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage clamp, diverting surge energy to ground before IC damage occurs. Use Value: 7.5 V breakdown prevents overvoltage beyond 5.5 V logic threshold while sustaining 605 A peak surge per ISO 7637-2 Pulse 5a. | Use Scenario: Stabilizing reference voltage for 12-bit ADC inputs in factory-floor pressure transducers. IC Role / Device Role / Timing Role: Precision voltage reference source with <4 Ω dynamic impedance ensuring <1 LSB error across temperature. Use Value: ±5% VZ tolerance and 0.25 mA knee current enable stable biasing even at low sensor excitation currents. |
| Consumer USB Power Delivery Interface | Telecom Line Card Surge Suppression |
Use Scenario: Protecting USB-C port controller ICs from ESD and hot-swap inrush transients. IC Role / Device Role / Timing Role: Fast-response transient voltage suppressor placed directly at connector entry point. Use Value: DO-214AC package allows placement within 2 mm of connector, minimizing inductance and preserving 605 A surge capability. | Use Scenario: Secondary-level clamping on 48 V phantom power lines in VoIP gateway line cards. IC Role / Device Role / Timing Role: Standby-mode voltage regulator and fault-energy limiter during lightning-induced surges. Use Value: 10 µA max reverse leakage at 5 V ensures negligible standby current draw across 100+ parallel ports. |
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 |
|---|---|---|---|
| 1N4737A | Same 7.5 V nominal, but DO-41 package (larger footprint, higher RθJL = 50°C/W) | Through-hole assembly only; unsuitable for high-density SMT layouts | Select when legacy through-hole design or manual repair is required |
| BZX84-C7V5 | 7.5 V ±5%, SOT-23 package, 300 mW rating, higher ZZT (15 Ω) | Limited to low-energy clamping (<100 A surge); not rated for 2.0 W continuous | Select for space-constrained signal-line protection where power dissipation is <0.3 W |
Compared with 1N4737A and BZX84-C7V5, the SMAJ4737E3/TR13 delivers superior thermal performance (25°C/W vs. 50°C/W), higher surge robustness (605 A vs. ~100 A), and SMT compatibility-making it optimal for automotive and industrial power rail protection where reliability and density are critical.
Availability
SMAJ4737E3/TR13 is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interfaces, consumer USB-C protection, and telecom line card designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ4737E3/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
Vishay Semiconductor is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and optoelectronics for demanding industrial and automotive applications.
The SMAJ47xxA series is designed specifically for robust, low-profile transient voltage suppression and precision DC voltage regulation in harsh-environment power systems.
FAQ
What is the zener voltage tolerance of SMAJ4737E3/TR13?
The SMAJ4737E3/TR13 has a zener voltage tolerance of ±5% at 7.5 V, verified at 34 mA test current and 25°C ambient. This tighter tolerance versus standard 10% variants (e.g., SMAJ4737) improves accuracy in feedback loops and reference circuits. The 'A' suffix in the part number explicitly denotes the 5% grade, and the value is guaranteed across –65°C to +150°C operating range.
Does SMAJ4737E3/TR13 meet RoHS and lead-free soldering requirements?
Yes, SMAJ4737E3/TR13 features ROHS-compliant annealed matte-tin plating on its leads and is qualified for lead-free reflow soldering per MIL-STD-750 Method 2026. The void-free thermosetting epoxy case meets UL94V-0 flammability rating, and the entire construction complies with EU Directive 2011/65/EU and subsequent amendments.
What is the maximum surge current rating for SMAJ4737E3/TR13?
The SMAJ4737E3/TR13 is rated for 605 A peak surge current (IZSM) under standardized 1/2 sine-wave conditions (1/120 second duration). This rating is measured at 25°C ambient and applies to single-event transients such as ISO 7637-2 Pulse 5a or IEC 61000-4-5 Combination Wave surges, provided PCB layout minimizes parasitic inductance.
How does the thermal resistance of SMAJ4737E3/TR13 affect its power handling?
SMAJ4737E3/TR13 has a junction-to-lead thermal resistance (RθJL) of 25°C/W. At 100°C junction temperature, its maximum regulator current drops to 242 mA. Engineers must calculate actual junction temperature using TJ = TL + (PD × RθJL) and ensure lead temperature remains within limits-especially in sealed enclosures or high-ambient industrial settings.
Can SMAJ4737E3/TR13 be used as a voltage reference in precision analog circuits?
Yes, SMAJ4737E3/TR13 is suitable as a low-cost voltage reference in non-critical analog circuits due to its 4.0 Ω dynamic impedance at 34 mA and sharp breakdown knee. However, its ±5% initial tolerance and 0.01%/°C typical tempco mean it is not recommended for high-accuracy references (e.g., >12-bit DACs); instead, it excels in power rail clamping and coarse regulation where stability over temperature and current is more critical than absolute accuracy.
SMAJ4737E3/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:
- ±10%
- 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
SMAJ4737E3/TR13 FAQ
1.How can I place an order for SMAJ4737E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4737E3/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 SMAJ4737E3/TR13 reliable?
The price and inventory of SMAJ4737E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4737E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4737E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4737E3/TR13 transactions.
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4.How is shipping managed for SMAJ4737E3/TR13?
SMAJ4737E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4737E3/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 SMAJ4737E3/TR13?
For technical support, including SMAJ4737E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4737E3/TR13 requirements.
6.How does Aetrix verify that SMAJ4737E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4737E3/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 SMAJ4737E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4737E3/TR13?
All SMAJ4737E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4737E3/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 SMAJ4737E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4737E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4737E3/TR13 Tags
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MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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