My Inquiry
My Account
Microchip Technology SMAJ4733AE3/TR13
- Part No.:
- SMAJ4733AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4733AE3/TR13.pdf
- Description:
- DIODE ZENER 5.1V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,443
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ4733AE3/TR13 from SM Semiconductors is a 5.1 V, 5% tolerance Zener diode in SMA (DO-214AC) package, rated for 2.0 W steady-state power dissipation, 356 mA maximum regulator current at 100°C, and 890 mA peak surge current. It serves as a precision voltage reference and transient overvoltage clamp in low-voltage DC rails of sensor interfaces and microcontroller I/O protection circuits.
For engineers reviewing the SMAJ4733AE3/TR13 datasheet, SMAJ4733AE3/TR13 pinout, SMAJ4733AE3/TR13 application, or SMAJ4733AE3/TR13 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (25°C/W), reverse leakage at 1.0 V, knee impedance (7.0 Ω), and surge current capability under 1/2-sine 1/120 s pulse conditions.
Technical Context
This device operates as a silicon planar Zener diode with sharp breakdown knee, specified for regulation across 1.0–5.0 mA test current range and stable performance from –65°C to +150°C. Its 5.1 V nominal breakdown voltage is measured at 49.0 mA (IZT), with dynamic impedance of 7.0 Ω and knee impedance of 400 Ω at 1.0 mA (IZK).
The SMAJ4733AE3/TR13 uses void-free thermosetting epoxy encapsulation (UL94V-0), matte-tin-plated axial leads, and cathode band polarity marking. It delivers 2.0 W steady-state dissipation with 25°C/W junction-to-lead thermal resistance, enabling reliable operation without external heatsinking in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 5.1 V ±5% at 49.0 mA - defines clamping threshold for overvoltage protection in 5 V logic rails |
| Power Dissipation PM(AV) | 2.0 W - supports continuous regulation without derating up to 100°C ambient with adequate lead heat sinking |
| Max Surge Current Izsm | 890 mA - withstands 1/2-sine 1/120 s transients induced by inductive switching in automotive sensor lines |
| Dynamic Impedance ZZT | 7.0 Ω at 49.0 mA - ensures minimal voltage shift under load variation in feedback reference applications |
| Reverse Leakage IR | 10 µA max at 1.0 V - guarantees low standby power loss in battery-backed monitoring circuits |
| Thermal Resistance RθJL | 25 °C/W - enables direct PCB trace conduction cooling; no thermal pad required for ≤1.5 W operation |
Pinout & Package
Package: SMA (DO-214AC), surface-mountable axial-leaded case with cathode band marking; body marked "SMAJ4733A"; weight ≈0.3 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink during forward bias; reference node in reverse-biased regulation | Connected to lower-potential rail (e.g., GND or signal return); forms cathode-referenced clamp path |
| Cathode | Current source during reverse breakdown; regulated output node | Connected to protected line (e.g., MCU I/O or sensor supply); clamps voltage to 5.1 V ±5% |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Enables tighter regulation margin vs. 10% variants-critical for 5 V rail compliance in industrial controllers |
| 25°C/W junction-to-lead thermal resistance | Permits full 2.0 W dissipation using only PCB copper traces as heatsink-no thermal vias needed |
| 400 Ω knee impedance at 1.0 mA | Ensures stable turn-on below 1 mA, supporting ultra-low-power wake-up detection in battery systems |
| UL94V-0 epoxy encapsulation | Meets flammability requirements for enclosed industrial enclosures and automotive junction boxes |
Applications
| Industrial Sensor Interface Protection | Automotive Body Control Module I/O Clamp |
|---|---|
Use Scenario: Protecting analog outputs of temperature/humidity sensors from ESD and load-dump transients in factory automation PLCs. IC Role / Device Role / Timing Role: Zener clamp placed between sensor output and MCU ADC input, referenced to system ground. Use Value: Limits voltage excursion to ≤5.4 V (5.1 V + 5%), preventing ADC saturation and latch-up during 1 kV ESD events. | Use Scenario: Safeguarding LIN bus transceiver I/O pins against battery reverse-connection spikes and alternator load dump in door module ECUs. IC Role / Device Role / Timing Role: Bidirectional transient suppressor connected between LIN data line and chassis ground. Use Value: Absorbs 890 mA surge pulses without degradation, maintaining signal integrity during 12 V system transients. |
| Consumer IoT Microcontroller Reset Line Stabilization | Telecom Power Supply Reference Clamping |
Use Scenario: Stabilizing reset pin voltage of ARM Cortex-M0+ SoCs in smart home hubs exposed to AC line noise coupling. IC Role / Device Role / Timing Role: Low-leakage (≤10 µA) Zener shunt on active-low reset line, referenced to VDD. Use Value: Maintains valid reset assertion window by clamping noise peaks above 5.4 V while drawing negligible standby current. | Use Scenario: Providing stable 5.1 V reference for error amplifier feedback in isolated 5 V/3 A telecom DC-DC converters. IC Role / Device Role / Timing Role: Precision shunt regulator in optocoupler feedback loop, replacing TL431 where lower cost and higher surge immunity are required. Use Value: Delivers 7.0 Ω dynamic impedance for <10 mV output ripple under 10–100 mA load steps, improving regulation accuracy. |
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 |
|---|---|---|---|
| 1N4733A | Same 5.1 V ±5%, but DO-41 package (axial lead); RθJL = 50°C/W; PM(AV) = 1.0 W | Requires through-hole mounting and larger board area; unsuitable for high-density SMT designs | Select when legacy through-hole assembly or higher lead thermal mass is preferred over space-constrained SMT |
| BZX55C5V1 | 5.1 V ±5%, DO-35 package; PM(AV) = 500 mW; Izsm = 200 mA; RθJL = 500°C/W | Limited to low-energy transients; not rated for automotive load-dump or industrial inductive switching | Choose only for low-power signal-level clamping where surge immunity is non-critical |
Compared with 1N4733A and BZX55C5V1, the SMAJ4733AE3/TR13 provides double the power rating (2.0 W), half the thermal resistance (25°C/W), and 4.5× higher surge current (890 mA), making it uniquely suitable for ruggedized SMT applications demanding both precision and robustness.
Availability
SMAJ4733AE3/TR13 is available at Aetrix Electronics and suitable for industrial sensor interface protection, automotive body control module I/O clamping, and consumer IoT microcontroller reset line stabilization requiring stable component supply and RoHS-compliant sourcing.
Supply support for SMAJ4733AE3/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 Semiconductors is a Taiwan-based manufacturer specializing in discrete semiconductor devices including Zener diodes, TVS diodes, rectifiers, and bridge rectifiers for industrial and automotive markets.
The SMAJ47xxA series was designed specifically for high-reliability transient voltage suppression in space-constrained SMT applications where axial-leaded Zeners cannot meet density or mechanical shock requirements.
FAQ
What is the Zener voltage tolerance of SMAJ4733AE3/TR13?
The SMAJ4733AE3/TR13 has a nominal Zener voltage of 5.1 V with a ±5% tolerance, as indicated by the "A" suffix per the manufacturer's documentation. This tolerance applies at the specified test current of 49.0 mA and ensures predictable clamping behavior across production lots for use in 5 V system protection.
Does SMAJ4733AE3/TR13 meet RoHS requirements?
Yes, SMAJ4733AE3/TR13 features ROHS-compliant annealed matte-tin plating on its terminals, verified per MIL-STD-750 Method 2026, and uses UL94V-0 thermosetting epoxy encapsulation. The "E3" suffix explicitly denotes RoHS-compliant construction, making it suitable for environmentally regulated industrial and automotive programs.
What is the maximum surge current rating for SMAJ4733AE3/TR13?
The SMAJ4733AE3/TR13 is rated for a peak surge current (Izsm) of 890 mA under standardized 1/2-sine wave conditions with 1/120 second duration. This value is measured at 25°C ambient and reflects its capability to absorb transient energy from inductive load switching without parametric shift or failure.
Can SMAJ4733AE3/TR13 be used as a voltage reference in precision analog circuits?
SMAJ4733AE3/TR13 can serve as a cost-effective voltage reference in non-critical analog circuits, delivering 5.1 V ±5% with 7.0 Ω dynamic impedance at 49 mA. However, its 10 µA reverse leakage at 1.0 V and lack of temperature coefficient specification limit use in high-accuracy references-designers should verify stability over temperature in final layout.
What is the thermal resistance junction-to-lead for SMAJ4733AE3/TR13?
The thermal resistance junction-to-lead (RθJL) of SMAJ4733AE3/TR13 is 25°C/W, measured under standard test conditions. This low value enables efficient heat transfer from the die to PCB copper traces, allowing full 2.0 W power dissipation without additional heatsinking when mounted on ≥10 mm² of 1 oz copper.
SMAJ4733AE3/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):
- 5.1 V
- Tolerance:
- ±5%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 7 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 1 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
SMAJ4733AE3/TR13 FAQ
1.How can I place an order for SMAJ4733AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4733AE3/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 SMAJ4733AE3/TR13 reliable?
The price and inventory of SMAJ4733AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4733AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4733AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4733AE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4733AE3/TR13?
SMAJ4733AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4733AE3/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 SMAJ4733AE3/TR13?
For technical support, including SMAJ4733AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4733AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4733AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4733AE3/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 SMAJ4733AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4733AE3/TR13?
All SMAJ4733AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4733AE3/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 SMAJ4733AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4733AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4733AE3/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…
