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ADTT1-1+
Mini-Circuits
1:1 CORE & WIRE TRANSFORMER, 0.3
2285 Pcs New Original In Stock
RF Balun 300kHz ~ 300MHz 50 / 50Ohm 6-SMD, Flat Leads
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5.0 / 5.0
- (217 Ratings)
ADTT1-1+
Product Overview
9833745
DiGi Electronics Part Number
ADTT1-1+-DGManufacturer
Mini-Circuits
ADTT1-1+
Description
1:1 CORE & WIRE TRANSFORMER, 0.3Inventory
2285 Pcs New Original In Stock
RF Balun 300kHz ~ 300MHz 50 / 50Ohm 6-SMD, Flat Leads
Quantity
Minimum 1
Minimum 1
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ADTT1-1+ Technical Specifications
Category
Balun
Packaging
Tape & Reel (TR)
Series
-
Product Status
Active
Frequency Range
300kHz ~ 300MHz
Impedance - Unbalanced/Balanced
50 / 50Ohm
Phase Difference
2°
Insertion Loss (Max)
3dB
Return Loss (Min)
6.02dB
Package / Case
6-SMD, Flat Leads
Mounting Type
Surface Mount
Datasheet & Documents
HTML Datasheet
ADTT1-1+-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8504.31.4035
Additional Information
Other Names
3157-ADTT1-1+CT
3157-ADTT1-1+TR
3157-ADTT1-1+DKR
Standard Package
1,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
何かあったときに頼りになるサポート体制に感謝です。価格も安く良かったです。
Dec 02, 2025
They deliver support that is reliable, professional, and thoughtful.
Dec 02, 2025
DiGi Electronics demonstrates exceptional inventory management, ensuring a seamless shopping experience.
Dec 02, 2025
Tracking details were clear and provided regular updates.
Dec 02, 2025
The website provides timely updates and notifications about order status.
Dec 02, 2025
Their commitment to quality consistency means I can shop with peace of mind.
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Frequently Asked Questions (FAQ)
When designing with the Mini-Circuits ADTT1-1+ for a 300kHz to 300MHz application, what are the critical layout considerations to maintain the specified 2° phase balance and avoid performance degradation?
The ADTT1-1+ is a 1:1 core and wire transformer in a 6-SMD flat lead package. To maintain the 2° phase balance and minimize insertion loss, treat the device as a transmission line component. Keep traces to the unbalanced (primary) and balanced (secondary) ports as short and symmetrical as possible. For the balanced output (pins 4, 5, and 6), ensure the two output traces (e.g., to a differential ADC or mixer) are impedance-controlled (50Ω differential) and matched in length to prevent phase imbalance. The center tap (pin 4) should have a low-inductance path to AC ground. Ground vias must be placed directly next to the ground pin (pin 2) and the center tap to reduce parasitic inductance, which can cause gain ripple and degrade return loss below the 6.02dB minimum specification at higher frequencies near 300MHz.
I am considering replacing a discontinued wideband balun like the Murata DXP.4N.01.A.010 with the Mini-Circuits ADTT1-1+. What are the key electrical and footprint compatibility risks I need to evaluate?
While both are 1:1 50Ω baluns, the ADTT1-1+ has distinct characteristics. First, evaluate frequency coverage: the ADTT1-1+ operates from 300kHz to 300MHz, whereas many ceramic multilayer baluns start higher (e.g., 10MHz+), so verify your lower band limit. Second, the ADTT1-1+ is a core & wire transformer with a 3dB max insertion loss, which is typically higher than ceramic baluns but offers superior phase balance (2° vs often 5-10°). Third, the footprint is critical: the ADTT1-1+ uses a 6-SMD flat lead package, requiring specific land patterns for the gull-wing leads. Unlike the Murata DXP series (which often uses a 4-pad LGA or SMD), you must ensure adequate solder paste volume for the leads to avoid tombstoning or poor RF grounding. Finally, the center tap on the ADTT1-1+ (pin 4) is exposed—if your previous design did not use a center tap, you must add a DC bias path or AC grounding, which adds design complexity.
For a high-reliability design using the ADTT1-1+, how does the core and wire construction affect long-term reliability in humid or thermally cycled environments compared to LTCC baluns, despite its MSL1 rating?
The ADTT1-1+ is rated MSL1 (unlimited floor life), indicating no moisture sensitivity for soldering. However, its core and wire construction (ferrite core with magnet wire) is inherently more susceptible to mechanical stress and humidity ingress over time compared to Low-Temperature Co-fired Ceramic (LTCC) baluns. In high-reliability applications with extreme temperature cycling (-55°C to +125°C), the difference in Coefficient of Thermal Expansion (CTE) between the ferrite core, wire, and PCB can cause micro-fractures in solder joints or wire fatigue, potentially altering inductance and insertion loss. For mission-critical systems, ensure PCB material matches the thermal expansion characteristics (e.g., polyimide or FR-4 with proper relief) and consider conformal coating to protect against humidity, which can increase the core's magnetic loss factor. In contrast, LTCC baluns would offer a hermetic-like structure but lack the ADTT1-1+'s excellent low-frequency performance and phase balance.
I need to interface a single-ended 50Ω signal to a differential ADC driver operating at 100MHz using the ADTT1-1+. How do I properly terminate the balanced side to ensure the return loss stays better than the 6.02dB minimum specified, and how does the center tap factor into DC biasing?
To achieve the specified 6.02dB return loss (equivalent to a VSWR of 3.0:1) and optimize performance, the balanced side (pins 5 and 6) must see a precise 50Ω differential impedance. Do not simply terminate each line to ground with 25Ω; instead, place a 50Ω resistor across pins 5 and 6 if the ADC driver presents a high impedance. For ADC driver interfaces, the center tap (pin 4) is critical: it provides a DC return path. If your ADC driver requires a common-mode voltage (Vcm), apply it directly to pin 4 through a low-inductance ferrite bead or a wide trace, ensuring that the AC path to ground is still provided via a capacitor (e.g., 0.1µF) placed physically close to the pin. Failing to provide a low-impedance AC ground at the center tap will result in common-mode signal conversion, drastically increasing insertion loss and causing severe imbalance that will degrade the return loss beyond the 6.02dB limit, especially near the 300MHz upper end.
In a push-pull amplifier stage design using the ADTT1-1+, what is the risk of core saturation if the amplifier outputs have a DC offset mismatch, and how can I mitigate it without affecting the 300kHz low-frequency cutoff?
The ADTT1-1+ is a core and wire transformer, making it susceptible to DC current imbalance when used in push-pull configurations. If the two amplifier outputs connected to the balanced side (pins 5 and 6) have mismatched DC bias voltages, a net DC current flows through the primary (or secondary) winding. This DC current can partially saturate the ferrite core, significantly reducing the effective inductance and degrading low-frequency performance. The result is increased insertion loss and distortion below 1-2MHz, potentially violating the 300kHz lower limit. To mitigate this, use AC coupling capacitors (e.g., 0.1µF to 1µF) in series with each balanced output line between the amplifier and the ADTT1-1+ to block DC. If blocking DC is not possible, ensure the amplifiers are precisely DC-balanced using servo loops. Alternatively, if your design can tolerate it, increasing the impedance of the center tap (pin 4) to ground at low frequencies can reduce the circulating DC current, but this must be balanced against the need for a low-AC impedance return path for RF signals.
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ADTT1-1+ CAD Models
Mini-Circuits ADTT1-1+ PCB symbols & footprints
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