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Microchip Technology SMBG5345A/TR13
- Part No.:
- SMBG5345A/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG5345A/TR13.pdf
- Description:
- DIODE ZENER 8.7V 5W DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,803
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Product details
Overview
SMBG5345A/TR13 from Microsemi is a surface-mount 5 W Zener diode with nominal Zener voltage of 8.7 V, ±10% tolerance, 150 mA test current (IZT), 2.0 Ω dynamic impedance (ZZT), and 545 mA maximum regulator current (IZM). It operates in the DO-215AA gull-wing package and is used for precision voltage regulation in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the SMBG5345A/TR13 datasheet, SMBG5345A/TR13 pinout, SMBG5345A/TR13 application, or SMBG5345A/TR13 equivalent, this page delivers verified electrical parameters, JEDEC-compliant packaging details, thermal derating behavior, RoHS status, and direct alternatives for voltage reference and clamping designs requiring stable 8.7 V regulation at up to 5 W.
Technical Context
This device functions as a two-terminal silicon Zener diode operating in reverse breakdown mode. Its regulation performance is defined at IZT = 150 mA, with ZZT = 2.0 Ω measured under 10% rms ac modulation superimposed on IZT, per MicroNote 202.
Thermal management relies on junction-to-lead resistance of 25 °C/W and junction-to-ambient resistance of 90 °C/W when mounted on FR4 with recommended footprint. Power dissipation is rated at 5.0 W only when lead temperature (TL) remains ≤25 °C; derating applies above that threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.7 V ±10% - defines regulated output voltage at 150 mA, usable across industrial temperature range (-65 to +150 °C) |
| Test Current (IZT) | 150 mA - standardized bias point where VZ and ZZT are guaranteed; sets minimum operating current for stable regulation |
| Dynamic Impedance (ZZT) | 2.0 Ω - low incremental resistance ensures minimal voltage shift under load transients up to 10% ac modulation |
| Max Regulator Current (IZM) | 545 mA - maximum continuous dc current at rated power; calculated as P/VZM = 5 W / 9.57 V (high-end tolerance) |
| Power Dissipation (PD) | 5.0 W @ TL ≤25 °C - full rating requires thermal path to leads; drops to 1.38 W at TA = 25 °C on FR4 board |
| Reverse Leakage (IR) | 10 µA @ VR = 6.25 V - confirms tight cutoff below knee voltage, critical for low-power standby regulation |
| Surge Current (IZSM) | 10 A (8.3 ms half-sine) - supports transient overvoltage suppression without failure in surge-prone inputs |
Pinout & Package
DO-215AA gull-wing surface-mount package with cathode indicated by band; banded end must be held positive relative to anode for proper Zener operation. Moisture sensitivity level is IPC/JEDEC J-STD-020B Level 1 - no dry pack required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Breakdown terminal | Connected to higher potential node; reverse-biased to conduct and clamp/regulate voltage |
| Anode (unbanded end) | Reference terminal | Connected to lower potential (e.g., ground or return); completes bias path for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC 1N53xxB equivalence | Identical electrical specs and test methods to legacy through-hole 1N5345B - enables drop-in replacement in upgraded SMT designs |
| Gull-wing lead form | Enables visual solder joint inspection and reliable reflow attachment on high-density PCBs without tombstoning |
| Level 1 moisture sensitivity | Eliminates baking requirement before assembly - reduces manufacturing cost and handling risk |
| RoHS-compliant matte-tin plating | Meets EU Directive 2011/65/EU; compatible with Pb-free and SnPb solder processes without intermetallic concerns |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp for Microcontroller I/O |
|---|---|
Use Scenario: Regulates error amplifier reference in isolated flyback converter secondary-side feedback loop. IC Role / Device Role / Timing Role: Zener voltage reference providing stable 8.7 V setpoint for optocoupler-driven feedback. Use Value: Maintains ±10% output regulation across line/load/temperature with <2 Ω dynamic impedance limiting transient deviation. | Use Scenario: Protects 3.3 V or 5 V GPIO pins from accidental 12 V misconnection or ESD-induced overshoot. IC Role / Device Role / Timing Role: Shunt clamp absorbing excess energy above 8.7 V while limiting pin voltage to safe levels. Use Value: Withstands 10 A surge (8.3 ms) and holds leakage <10 µA below 6.25 V - prevents false triggering during normal operation. |
| Industrial Sensor Signal Conditioning | Programmable Logic Controller (PLC) Input Protection |
Use Scenario: Stabilizes excitation voltage for bridge-based pressure sensors in harsh factory environments. IC Role / Device Role / Timing Role: Precision shunt regulator maintaining constant bias for ratiometric measurement accuracy. Use Value: Operates continuously from -65 to +150 °C with <0.1%/°C typical tempco - ensures calibration stability over wide ambient range. | Use Scenario: Guards 24 V digital input channels against field-wiring transients and polarity reversal. IC Role / Device Role / Timing Role: Primary overvoltage limiter placed ahead of input conditioning circuitry. Use Value: Delivers 5 W steady-state clamping plus 10 A surge capability - meets IEC 61000-4-5 Level 3 requirements without external series impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5345B | Same VZ (8.7 V), IZT (150 mA), ZZT (2.0 Ω), but axial T-18 package; non-SMT | Requires through-hole assembly; unsuitable for high-density or automated SMT lines | Select when legacy board reuse or manual prototyping favors axial leads |
| SMBJ5345A | Same VZ, tolerance, and electrical specs; identical DO-214AA (J-bend) package instead of DO-215AA (gull-wing) | Requires different pad layout; gull-wing offers better visual inspection than J-bend | Select when existing DO-214AA footprint is fixed and rework of stencil/pad design is not feasible |
Compared with SMBG5345A/TR13, 1N5345B demands through-hole placement and lacks SMT process compatibility, while SMBJ5345A shares all electrical behavior but uses a J-bend leadform that impedes post-reflow optical inspection - SMBG5345A/TR13 uniquely combines JEDEC-equivalent performance with gull-wing manufacturability and Level 1 moisture robustness.
Availability
SMBG5345A/TR13 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, PLC input protection, and microcontroller I/O clamping requiring stable component supply with full RoHS compliance and JEDEC-verified Zener characteristics.
Supply support for SMBG5345A/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 Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The SMBG53xxA/B series was designed to deliver JEDEC-registered Zener performance in surface-mount form - enabling high-density, high-reliability voltage regulation and transient suppression in mission-critical power and interface circuits.
FAQ
What is the Zener voltage tolerance for SMBG5345A/TR13?
The SMBG5345A/TR13 has a Zener voltage tolerance of ±10%, meaning its regulated voltage falls between 7.83 V and 9.57 V at 150 mA test current and 25 °C. This tolerance is encoded by the "A" suffix in the part number and is verified per JEDEC test methods. The SMBG5345A/TR13 maintains this specification across its full operating temperature range of -65 to +150 °C.
Is SMBG5345A/TR13 RoHS compliant?
Yes, SMBG5345A/TR13 is RoHS compliant, using annealed matte-tin plating per JEDEC standard. The "e3" marking variant (e.g., SMBG5345Ae3/TR13) explicitly denotes RoHS compliance, but the base SMBG5345A/TR13 is also manufactured to RoHS requirements. It satisfies EU Directive 2011/65/EU and is compatible with both Pb-free and SnPb solder reflow profiles up to 260 °C for 10 seconds.
What is the maximum continuous current SMBG5345A/TR13 can handle?
The SMBG5345A/TR13 supports a maximum continuous regulator current (IZM) of 545 mA when lead temperature (TL) is maintained at or below 25 °C. This value is derived from the 5.0 W power rating divided by the upper-limit Zener voltage (9.57 V). At ambient temperature (TA = 25 °C) on FR4, the usable IZM drops to approximately 152 mA due to thermal resistance limitations (RθJA = 90 °C/W).
How does SMBG5345A/TR13 compare to the through-hole 1N5345B?
SMBG5345A/TR13 is electrically identical to 1N5345B - same VZ (8.7 V), IZT (150 mA), ZZT (2.0 Ω), IR (10 µA @ 6.25 V), and IZM (545 mA) - but packaged in DO-215AA gull-wing form for surface-mount assembly. Unlike the axial T-18 1N5345B, SMBG5345A/TR13 eliminates through-hole drilling, supports automated placement, and carries IPC/JEDEC Level 1 moisture rating - making it ideal for modern high-volume SMT production.
What is the thermal resistance of SMBG5345A/TR13, and how does it affect layout?
SMBG5345A/TR13 has a junction-to-lead thermal resistance (RθJL) of 25 °C/W and junction-to-ambient resistance (RθJA) of 90 °C/W when mounted on FR4 with the recommended footprint. To sustain full 5.0 W dissipation, the PCB must provide low-thermal-resistance paths from leads to internal copper planes or heatsinks. Layout must follow the specified pad dimensions (A = 8.13 mm, B = 2.16 mm, C = 2.79 mm) to ensure adequate heat spreading and avoid exceeding 150 °C junction temperature.
SMBG5345A/TR13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-215AA, SMB Gull Wing
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 8.7 V
- Tolerance:
- ±10%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 6.25 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 1 A
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBG)
SMBG5345A/TR13 FAQ
1.How can I place an order for SMBG5345A/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG5345A/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 SMBG5345A/TR13 reliable?
The price and inventory of SMBG5345A/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG5345A/TR13 is usually 5 days.
3.What payment methods are accepted for SMBG5345A/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG5345A/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG5345A/TR13?
SMBG5345A/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG5345A/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 SMBG5345A/TR13?
For technical support, including SMBG5345A/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG5345A/TR13 requirements.
6.How does Aetrix verify that SMBG5345A/TR13 is sourced from the original manufacturer or authorized distributors?
All SMBG5345A/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 SMBG5345A/TR13 meets industry standards.
7.What is the process for return or replacement of SMBG5345A/TR13?
All SMBG5345A/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG5345A/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 SMBG5345A/TR13 part is unused and in its original packaging.
Return procedure for SMBG5345A/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG5345A/TR13 Tags
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MM5Z5V1ST1G
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