BTTC B-3226 (M-21038/27-26)
- MIL-STD-1553A/B pulse transformer, fully qualified to DESC specification MIL-PRF-21038/27-26
- Dual turns ratios: 1CT:2.5CT (±3%) and 1CT:1.79CT (±3%) — step-up configurations for direct DDC transceiver interfacing
- 4,000Ω minimum impedance, 250ns maximum output rise time, 1.0Ω primary DC resistance max
- Epoxy encapsulated per MIL-PRF-21038, through-hole PC mount, 0.300" maximum height
- QPL listed under MIL-PRF-21038/27, −55°C to +125°C operating range, sinusoidal and trapezoidal waveform compatible
Beta Transformer Technology Corp. (BTTC), a subsidiary of Data Device Corporation (DDC) — the leading supplier of MIL-STD-1553 protocol silicon — designs and manufactures the B-2200/2300/3200 series of MIL-STD-1553 pulse transformers specifically to complement DDC's full MIL-STD-1553 transceiver product line. The B-3226 is available from stock at Sparkle Electronics, a specialized hi-rel component distributor serving defense prime contractors, avionics OEMs, and government procurement offices requiring QPL-qualified passive components with full documentation traceability and same-day response on pricing and availability. As a QPL-listed device under DESC specification M-21038/27-26, the B-3226 meets all electrical requirements of MIL-STD-1553A and MIL-STD-1553B Manchester II serial bi-phase data transmission — providing the turns ratio configurations, galvanic isolation, and common mode rejection characteristics that direct-coupled bus interfaces cannot achieve without a compliant pulse transformer in the signal path.
The B-3226 provides two step-up turns ratio configurations — 1CT:2.5CT and 1CT:1.79CT — making it the correct specification for applications where a MIL-STD-1553 transceiver output must be stepped up to the bus voltage levels required for transformer-coupled direct stub or bus coupler connections. The epoxy encapsulated package, qualified per MIL-PRF-21038, uses tin-coated copper-clad steel leads configured for through-hole PCB mounting at a maximum height of 0.300 inches — a form factor directly compatible with the dense PCB layouts of avionics line-replaceable units and embedded MIL-STD-1553 interface cards. For avionics systems, aerospace and defense, and satellite and space programs integrating MIL-STD-1553 data bus interfaces, the B-3226 is a QPL-traceable passive component that requires no engineering deviation for use in MIL-SPEC designs. Contact Sparkle Electronics to confirm stock and request a same-day quote.
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DESC Specification: M-21038/27-26
The B-3226 is qualified and listed under DESC Standard Microcircuit Drawing M-21038/27-26, the specific slash sheet within the MIL-PRF-21038/27 performance specification for low-power pulse transformers. QPL listing under MIL-PRF-21038/27 establishes that the B-3226 has been qualified to the full electrical, environmental, and mechanical requirements of the MIL-PRF-21038 specification, and that BTTC’s manufacturing process for this component is audited and maintained on the Qualified Products List administered by the Defense Logistics Agency.
For defense programs specifying MIL-STD-1553 bus interface components, procurement of a QPL-listed pulse transformer under M-21038/27-26 eliminates the qualification waiver process that non-QPL transformers require. The DESC part number M-21038/27-26 is the authoritative procurement reference for contract documentation — more specific and defensible than the manufacturer part number alone when procurement specifications require QPL traceability. Procurement teams sourcing M-21038/27-26 in stock, B-3226 MIL-STD-1553 transformer QPL, or BTTC MIL-PRF-21038 pulse transformer distributor can confirm inventory and documentation scope with Sparkle Electronics. Certificate of conformance and QPL lot documentation are available upon request. Contact our team before placing your order.
B-3226 in the MIL-STD-1553 Signal Chain: QPL Traceability Where It Counts
MIL-STD-1553 system integrators designing transformer-coupled bus interfaces specify the pulse transformer as a QPL-required passive component — not a commercial-of-the-shelf substitute. The B-3226’s dual step-up turns ratios (1CT:2.5CT and 1CT:1.79CT) are specifically dimensioned to match DDC’s MIL-STD-1553 transceiver output impedances, producing the correct bus voltage levels for direct stub coupling per MIL-STD-1553B electrical requirements. The 4,000Ω minimum impedance and 250ns maximum rise time define the frequency response boundaries within which the transformer passes Manchester II bi-phase encoded data without waveform distortion that would compromise bit error rate at the receiving terminal. For programs sourcing B-3226 in stock, BTTC MIL-STD-1553 pulse transformer M-21038/27-26, or QPL pulse transformer defense distributor, Sparkle Electronics maintains ready inventory with same-day response. Submit an inquiry for pricing, stock confirmation, and documentation requirements within 24 hours.
BTTC B-3226 vs. Related MIL-STD-1553 Transformers in the B-2200/2300/3200 Series
| Parameter | B-3226 | B-3225 | B-2202 |
|---|---|---|---|
| Manufacturer | BTTC / DDC | BTTC / DDC | BTTC / DDC |
| Availability | In Stock at Sparkle | Confirm with Sparkle | Confirm with Sparkle |
| DESC Number | M-21038/27-26 | M-21038/27-25 | M-21038/27-01 |
| Turns Ratio A | 1CT:2.5CT ±3% | 1CT:2.12CT ±3% | 1CT:1CT ±3% |
| Turns Ratio B | 1CT:1.79CT ±3% | 1CT:1.50CT ±3% | 1CT:0.707CT ±3% |
| Primary DC Resistance | 1.0Ω max | 1.0Ω max | 3.0Ω max |
| Secondary DC Resistance | 3.5Ω max | 3.0Ω max | 3.0Ω max |
| Output Rise Time | 250ns max | 200ns max | 150ns max |
| Impedance (min) | 4,000Ω | 4,000Ω | 4,000Ω |
| Height | 0.300″ | 0.300″ | 0.275″ |
| Mounting | Through-hole (Config A) | Through-hole (Config A) | Through-hole (Config A) |
| QPL | MIL-PRF-21038/27 | MIL-PRF-21038/27 | MIL-PRF-21038/27 |
The B-3226 provides the highest step-up ratio in the Configuration A series — 1CT:2.5CT primary-to-secondary — making it the correct selection for transceiver-to-bus coupling applications requiring maximum voltage step-up within the MIL-PRF-21038/27 QPL family. The B-3225 provides an intermediate step-up for applications with a tighter voltage budget. The B-2202 at 1:1 ratio is used for isolation-only applications where no voltage transformation is required. Selection between these variants is determined by the specific transceiver output impedance and bus stub configuration, not by qualification level — all three carry equivalent QPL status under MIL-PRF-21038/27.
MIL-STD-1553 Transformer Coupling: Why QPL Compliance Is a System Requirement, Not a Preference
MIL-STD-1553B specifies that the bus interface shall use transformer coupling between the transceiver and the bus stub or direct coupling connection. The specification defines the required isolation voltage, turns ratio constraints, and common mode rejection characteristics that the coupling transformer must meet. A non-QPL transformer that lacks formal qualification under MIL-PRF-21038/27 requires a qualification waiver in any program where MIL-STD-1553B compliance is contractually mandated — a waiver process that adds procurement timeline, documentation burden, and engineering review cost. The B-3226, as a QPL-listed component under M-21038/27-26, enters the bill of materials without a qualification waiver requirement, directly reducing procurement complexity and schedule risk for avionics systems and radar and electronic warfare programs. For broader MIL-SPEC passive and connector requirements, Sparkle Electronics maintains inventory across the Passives & Connectors (MIL-SPEC) category.
Frequently Asked Questions
What does BTTC B-3226 decode to?
BTTC = Beta Transformer Technology Corp. (DDC subsidiary); B = Beta transformer product line; 3226 = product series number within the B-3200 MIL-STD-1553 pulse transformer family, corresponding to DESC slash sheet M-21038/27-26. The 3200 series designates Configuration A (epoxy, through-hole, PC mount) with 0.300″ maximum height.
Where can I buy BTTC B-3226 in stock?
Sparkle Electronics maintains stock of the B-3226 for defense and avionics procurement. Contact our team for current pricing, available quantity, and confirmed lead time. Same-day response on RFQs — we serve defense prime contractors, government procurement offices, MIL-STD-1553 system integrators, and avionics OEMs globally. Supply continuity and long-term program support requirements can be discussed at inquiry stage.
What is the DESC specification number for B-3226?
M-21038/27-26 — the specific slash sheet under MIL-PRF-21038/27 for the B-3226 pulse transformer. This number establishes QPL traceability and is the authoritative procurement reference for defense contracts specifying QPL compliance. Certificate of conformance and QPL lot documentation are available from Sparkle Electronics upon request.
What turns ratio configurations does the B-3226 provide?
The B-3226 provides two turns ratios from a single transformer: 1CT:2.5CT (±3%) between pins 1-3 and 4-8, and 1CT:1.79CT (±3%) between pins 1-3 and 5-7. Both ratios are step-up configurations, dimensioned to match DDC MIL-STD-1553 transceiver output impedances for transformer-coupled direct stub or bus coupler connections per MIL-STD-1553B electrical requirements.
What is the difference between a cross reference and a direct replacement for B-3226?
A cross reference identifies components from alternative manufacturers — such as Pulse Engineering or Bourns — with equivalent turns ratios and electrical characteristics. A direct replacement requires identical turns ratio, QPL qualification under the same DESC slash sheet (M-21038/27-26), and equivalent package dimensions. For programs where QPL compliance is contractually mandated, only components QPL-listed under M-21038/27-26 are acceptable as direct replacements without a qualification waiver. Sparkle Electronics can support both cross-reference inquiries and QPL-compliant replacement sourcing — contact our team with your specific program requirements.
Does the B-3226 support both MIL-STD-1553A and MIL-STD-1553B?
Yes. The B-3226 is qualified and documented for both MIL-STD-1553A and MIL-STD-1553B Manchester II bi-phase data transmission compliance. The electrical characteristics — turns ratio, impedance, rise time, and common mode rejection — satisfy the bus interface requirements of both revisions of the standard, making the B-3226 applicable across legacy 1553A programs and current 1553B designs without component substitution.
Procuring B-3226 for a MIL-STD-1553 avionics or defense program? Sparkle Electronics stocks BTTC QPL-qualified MIL-STD-1553 pulse transformers with DESC specification traceability and full lot documentation support. Submit an inquiry — same-day response on pricing, stock, lead time, and conformance documentation.
